Abstract: A series elastic actuator includes a gear configured to rotate, an output body configured to rotate by the gear, and an elastic body connecting the gear and the output body. The elastic body may include an outer ring fastened to the gear, an inner ring positioned inside the outer ring and fastened to the output body, and a deformation portion connecting the outer ring and the inner ring and deforming elastically. The elastic body may include a plurality of elastic bodies connected in parallel or in series.

Abstract: A transmission unit for a motor vehicle transmission includes a drive gear (6) which is arranged rotatably on an intermediate shaft (5) and which can be fixed to the intermediate shaft (5) for the transmission of drive power via clutch means. On one side flank (9) of the drive gear, a first gear portion (10) is provided which can be connected to a corresponding shaft-side second gear portion (11) via an internally toothed sliding sleeve (12). On the opposite side flank (13) of the drive gear, a parking lock gear portion (14) is provided for engaging a pawl (15) to block the transmission unit when the vehicle is at a standstill.

Abstract: The invention relates to an assembly for holding an epicyclic gear train in a turbomachine comprising an annular housing in which are engaged a first annular part and a second annular part which are locked against rotation in the housing by first annular interlocking means and second annular interlocking means, respectively, wherein the first annular interlocking means are configured to allow a first circumferential clearance between the first annular part and the housing, the second annular interlocking means are configured to allow a second circumferential clearance between the second annular part and the housing, and the first circumferential clearance is strictly less than the second circumferential clearance.

Abstract: In a rotation transmission mechanism that transmits the rotational driving force of a motor to a load-side member via a speed reducer, a strain wave gearing is used as the speed reducer, and the allowable load torque of members in the powertrain other than the strain wave gearing is greater than a predetermined upper-limit load torque. The allowable load torque of the strain wave gearing is dictated by the ratcheting torque, which is set so as not to exceed the upper-limit load torque. In an overload state, ratcheting is generated in the strain wave gearing, so that the strain wave gearing functions as a mechanical fuse. Other power transmission members can be protected from an overload state without adding a separate member such as a torque limiter.

Abstract: A composite gear includes: a first member comprising a rotation shaft portion and a disk-shaped web extending in radial directions from the rotation shaft portion; and a second member comprising at least one engaging tooth on an outer periphery thereof and provided being supported by the web so as to surround an outer periphery of the first member. A space is provided between the second member and an outermost peripheral surface of the first member in a radial direction, a space is provided between the first member and an innermost peripheral surface of the second member in a radial direction, and at least one of the first member and the second member is formed to nip another of the first member and the second member from both sides thereof in an axial direction of the rotation shaft portion.

Abstract: A gear includes an inner portion formed from a first material; an outer portion formed from a second material melted and solidified onto the inner portion; and a plurality of teeth formed in the outer portion after the second material has solidified.

Abstract: Embodiments of the present disclosure relate to a transmission gear and a deceleration mechanism including the same. The transmission gear includes a metal ring; and a plastic gear member integral with the metal ring by injection molding, the metal ring is coaxially wrapped in the plastic gear member and provided with a locating portion for locating the metal ring in an injection mold, the plastic gear member having an outer circumference that is tooth-shaped, and the plastic gear member being formed with an input hole thereon through which an input shaft passes, an outer ring surface of the metal ring being adjacent to the outer circumference, and an inner ring surface of the metal ring having a diameter greater than or equal to that of the input hole. Since almost no shrinkage occurs to the plastic gear member during injection molding, such a transmission gear has good dimensional accuracy, strength and rigidity.

Abstract: A strain wave gear speed reducer unit includes: a casing extending in the axial direction; an internal gear disposed to be rotatable relative to the casing and having internal teeth on the inner circumference; a flexible external gear disposed to the inside of the internal gear in the radial direction, an end of which is fixed to the casing on one side in the axial direction, and which has external teeth on the outer circumference for meshing with the internal teeth; a cam disposed to the inside of the external gear in the radial direction and deforming the external gear in the radial direction by rotating together with a rotating shaft of a motor unit; a connecting part formed integrally with the cam and connected to the rotating shaft on the inside of the external gear; and a support connected to the casing and rotatably supporting the connecting part.

Abstract: A strain wave gear system (10) includes first and second sets of ball bearings (80, 82) located intermediate a flange (84) and a retainer plate (88) rotatable with an output (54) and a radially oriented flat disc (74) of the input including strain relief (76). Strain relief (76) is a helical slot in a coupling (70) located radially within the wave generator (94) and the ring gear (22). The ring gear (22) is sealed by a sealing system including sealant (42) forced by a protrusion (34) of the cap (24) entering into a cavity (36) through a channel (40) into a relief volume (38) of the housing (12). The bearing (48) rotatably mounting the housing (12) to the output (54) is lubricated by a lubricating system including plungers (110) threadably received in axial bores (102) intersecting with radial bores (104) in communication with radial holes (47) of the bearing (48).

Abstract: A manifold has a frame and a plurality of valves supported by the frame, each valve having a cross gear that includes four semicircular recesses and four arms that terminate in pointed tips, and wherein the tips are non-jamming rubber tips. The manifold also has a screw drive and a splined rotatable shaft parallel to the screw drive. The manifold further includes a slider driven by the screw drive over the splined rotatable shaft. The slider includes an actuator that protrudes from the slider to engage one of the cross gears to actuate a respective one of the plurality of valves.

Abstract: In order to provide a driving machine which achieves reciprocating movements of a rack using a simple mechanism and is able to smoothly engage and disengage the rack by reducing the friction during engagement and disengagement of the rack, the driving machine is equipped with: a nose that extends in a prescribed direction; a housing that has the nose; a blade that has an engaging section, is movably guided in the housing in the prescribed direction, and is capable of driving a fastener via the nose; and a transmission mechanism that has an engaged section for engaging with the engaging section in order to transmit a driving force, wherein the transmission mechanism has a roller mechanism for guiding the engaging section and engaged section to disengage from each other.

Abstract: An externally toothed gear of a dual-type strain wave gearing is provided with first and second external teeth having different teeth numbers, and is flexed into an ellipsoidal shape by a wave generator. When the theoretical values of the radial flexing amounts at major-axis positions of the first and second external teeth flexed into the ellipsoidal shape are expressed by d1=m1n1 and d2=m2n2 (m1 and m2 represent the modules of the first and second external teeth, and n1 and n2 represent positive integers), the radial flexing amounts of the first and second external teeth flexed by the wave generator satisfy d1a=?d1 and d2a=?d2, where 1.25???3. Accordingly, a dual-type strain wave gearing can be achieved with which the first and second external teeth having different numbers can be suitably flexed to form excellent mating states with respective internally toothed gears.

Abstract: The invention relates to a spur gear wheel with a gear body (4, 5) made from a sintered material, which has a circumference around which teeth (6, 7) are distributed projecting in the radial direction, and which is delimited by two end faces (8, 9, 10, 11) in the axial direction. At least one shaped element (12) in the form of a recess (13) and/or an elevation (14) and/or a compacted area is provided on at least one end face (8, 9, 10, 11) in the region of the teeth (6, 7) and/or in the radial direction underneath the teeth (6, 7).

Abstract: A drive assembly for a slide out in an expandable enclosure, the drive assembly comprising a beam attachable to the slide out, the beam having a first row of teeth and a second row of teeth thereon, the first row of teeth and the second row of teeth extending parallel to each other on opposite sides of the beam wherein the teeth in the first row of teeth are offset relative to the teeth in the second row of teeth and a drive gear having a first gear wheel engagable with the first row of teeth and a second gear wheel engagable with the second row of teeth, and an actuator coupled to the beam to selectively extend and retract the beam.

Abstract: A gear train with at least first and second spur gears (1, 2) which have a tooth width (b), mesh with one another and each have helical teeth (3, 4). The first spur gear (1) has a tooth profile with a crown circle diameter and the second spur gear (2) has a tooth profile with a root circle diameter. The first spur gear (1) has at least one projection (5) on the tooth profile that extends partially along the tooth width and beyond the crown circle diameter, and the at least one projection (5) has at least one contact face (5a) in the axial direction.

Abstract: A sintered gearwheel is described having teeth (1) which, in the flank and root region (2, 3), comprise a compacted surface layer (7, 8, 9) which is continuous in the transition portion (4) between the flank and root region (2, 3) and has a residual porosity of less than 10%. In order to increase the load-bearing capacity it is proposed that the compacted surface layer (9) is formed with a lower thickness in the transitional portion (4) between the flank and root region (2, 3) than in the adjacent flank and root regions (2, 3).

Abstract: The present invention provides a sintered body and a production method therefor in which effects of pores remaining at a surface of the sintered body can be avoided without removing the pores by machining and plastic working, thereby obtaining strength equivalent to that of ingot materials. The sintered member comprises: a hardness distribution in which hardness contiguously varies from a surface to an inner portion; a Vickers hardness value of 730 or less at the surface; the maximum hardness of which portion exists in a region of 150 to 300 ?m from the surface; wherein the maximum hardness is a Vickers hardness value of 600 or more.

Abstract: A gear having a tooth form shape includes, on a tooth root side of a tooth, (1) a first curved surface connected to a tooth face of an involute tooth form and convex in a direction opposite to the tooth face, (2) a flat surface connected to the first curved surface, and (3) a second curved surface connected to the flat surface and convex in the same direction as the first curved surface. The shape of the flat surface in a normal plane is a tangent in contact with a tip side end of a trajectory of motion B of a tooth of a meshing partner gear and intersecting with a tooth form center line at a 30° angle. The shapes of the first and the second curved surfaces in a normal plane are circular arcs.

Abstract: A method of designing a gear in which a tooth trace of the tooth flank, which is to be engaged with another mating tooth flank, is curved with respect to an axial direction of the body of the gear. The mating tooth flank of the mating gear is designed in such a manner that a desired tooth contact can be achieved. Accordingly, sufficient design precision can be attained. Furthermore, stress at the tooth flanks can be controlled when the gears are engaged with each other, thereby leading to high durability of the gears.

Abstract: A gear pair includes a small-diameter conical involute gear having a conical angle, and a large-diameter conical involute gear having a conical angle. The small-diameter conical involute gear and the large-diameter conical involute gear are constituted by an aggregate of imaginary cylindrical gears.

Abstract: A gear includes a gear root defined by a stretched root blended into an involute tooth profile curve within a True Involute Form diameter.

Abstract: The invention aims to improve not only the resistance to abrasion and scoring, but also the fatigue strength against pitting and chipping, without increasing the number of steps of the manufacturing process. The tooth face 2 of the gear is smoothed by gyro polishing. In the thus smoothed tooth face 2, a multitude of microscopic recesses 3 are randomly formed by liquid honing in which microscopic hard particles are collided with the tooth surface together with liquid. By the liquid honing, a large compressive residual stress is produced on the tooth face 2. This improves not only the resistance to abrasion and scoring, but also the fatigue strength against pitting and chipping, without increasing the number of steps of the manufacturing process.

Abstract: An accessory gearbox assembly for an aircraft includes one or more intermeshed gears disposed in a gearbox housing and configured to transfer rotational energy from an engine core. An accessory component has a spur gear located at least partially in an accessory housing. The spur gear is meshed with a gear of the one or more gears thereby transferring rotational energy from the gearbox to the accessory component. A method for providing rotational energy to an accessory component at an accessory gearbox includes providing rotational energy to one or more intermeshed gears of an accessory gearbox and locating an accessory component at the accessory gearbox. The accessory component includes a spur gear disposed at least partially in an accessory housing. The spur gear is meshed with a gear of the one or more gears and rotational energy is transferred to the accessory component via the spur gear.

Abstract: The invention relates to the gearing of a gearwheel having a plurality of teeth. The gearwheel has a useful area and a base area of the particular tooth flank form. Viewed in normal section, the tooth base area extends from a base circle up to a useful circle. The tooth flanks of adjacent teeth in normal section are each implemented as symmetrical to one another, the axis of symmetry intersecting the base circle in the base point. According to the invention, the tooth flanks are implemented in the tooth base area as a tangent function from a relevant diameter. The tangent function merges at the relevant diameter in a constant tangent into the tooth flank form of the useful area. The tangent function merges in the tooth base area in a constant tangent into an orbit, which is tangentially applied in the base point to the base circle. Significant increases of the tooth base strength may thus be achieved.

Abstract: A gear train comprising a driving gear and at least two driven gears respectively engaged with the driving gear. Multiple teeth of the driving gear can be accommodated between two adjacent teeth of each driven gear, the number of said teeth of the driving gear that can be accommodated between two adjacent teeth of each driven gear is equal to the number of the driven gears. The engagement of the driving gear with each driven gear is in order and in sequence, i.e., the driving gear engages each driven gear alternately. The invention teaches reduction of the number of the teeth of the driving gear.

Abstract: The invention relates to a method for the production of a one-piece, metal multiple wheel (2) for a traction mechanism comprising at least two adjacently disposed single wheels (3, 4), each comprising a wheel body (5, 6) having an outer circumference (7, 8), wherein teeth (9, 10) for engaging the traction mechanism are arranged in a distributed manner over the outer circumference (7, 8), and wherein at least one of the two single wheels (3, 4) is configured as a sprocket, gear or toothed belt wheel.

Abstract: The present invention includes a pair of first gear 11 and second gear 12 having the same tooth profile and rotatably combined in a state wherein rotation centers of the gears are coincident. One gear of the pair of gears 11 and 12 is formed with elastic displacement portion 15 that is biased in a direction of rotating the other gear with respect to one gear. The other gear is formed so that it has positioning portion 21 that positions the other gear with respect to one gear, and elastic displacement portion 15 contacts positioning portion 21.

Abstract: An arbor, arranged for attachment to a drilling rigs overhead support and drilling fluid circuit, has a cross frame with axles that support telescoping link arms to carry a single stand elevator at their lower end. The link arms have provision, at their top end, to tilt about a horizontal axis. The link arms can extend an amount greater than their minimum length.

Abstract: A gear having a thin-walled section formed on one end face among two end faces of a tooth in a tooth-width direction is provided. A portion of the thin-walled section is projected and formed so as to serve as an overhanging section. The overhanging section prevents backlash. A thickness T3 of the overhanging section, a thickness T2 of a tooth flank corresponding section, and a thickness T1 of a tooth crest corresponding section positioned therebetween satisfies the relation T1<T3<T2.

Abstract: An apparatus and method for finishing the mating surfaces of a gear set or gear train includes at least a first and a second rotatably connected gear element in dynamic, lubricated contact and rotating at different cycle rates. A hardness differential is employed between mating gear surfaces to balance surface damage imparted by friction and plastic deformation. The mating surfaces are of a hardness of at least approximately 70 on the Rockwell superficial hardness scale (70HR-30N), and are subjected to a polishing process, such as isotropic chemical finishing, to shape the surface asperity profile, thereby reducing accumulative damage due to friction and plastic deformation.

Abstract: A wave-gear-type linear-actuation mechanism comprises a flat-type wave gear; a lead screw that is a structural component of the wave gear and is formed on an outer peripheral surface of a first circular spline; and a linear-actuation cylinder threaded onto the lead screw, a linear-actuation cylinder 4 having a screw groove that is formed in an inner peripheral surface thereof. It is possible to obtain a linear-actuation mechanism whose holding force during reverse input mode (speed increasing mode) is higher than cases where a cup-type flexible screw is used.

Abstract: A drive wheel for integration into a clock movement, in particular into the clock movement of wristwatches, with at least a dented section by whose teeth a downstream wheel is rotatably drivable and at least a non-dented section which has a diameter chosen in such a manner that the part-circular circumference of the drive wheel in the non-dented section blocks the downstream wheel against rotation while the teeth of the downstream wheel face this section. The non-dented section of the drive wheel includes at least a flexible element that is arranged, seen in the direction opposite to the direction of rotation of the drive wheel, immediately after the dented section and that includes an elasticity essentially directed in radial direction of the drive wheel for the change of the diameter of the non-dented section of the drive wheel in the range of the flexible element.

Abstract: Disclosed is a sintered gear composed of a sintered alloy having a metal matrix and pores. The tooth surface (2, 3, 4) of the tooth and the bottom land (5) have a densified layer (11) in which the porosity is reduced to 10% or less from the sintered alloy. The densified layer at the tooth surface is formed with a thickness of 300 to 1,000 microns, and the densified layer at the bottom land is formed with a thickness of 10 to 300 microns. The boundary surface of the densified layer is continuous from the tooth surface side to the bottom land side so as not to have a substantial level difference.

Abstract: A gear having window holes, and method and apparatus for mafufacturing the same in which by depressing partially one end surface of a primary formed article, a plurality of concaves for the window holes is formed at the one end surface in an axial direction of the primary formed articles, a plurality of projections are extruded from the other end surface thereof and tooth forms preformed at an outer peripheral wall of the primary formed article is thrown out in radial direction thereof, and the gear is formed by cutting the plurality of projections extruded from the other end surface thereof.

Abstract: An engine suitable for a motor vehicle, preferably a motorcycle, and a related transmission is provided. The transmission is provided with a hydrostatic device and a planetary transmission leading to a driven shaft. In order to optimize the engine with regard to construction and function the hydrostatic device of the transmission cooperating with the internal combustion engine is in an effective connection to the planetary transmission.

Abstract: A bi-directional locking ring assembly is provided comprising a housing and a gear having a plurality of teeth. The gear is coupled to the housing to rotate in opposite directions about a rotational axis. A pin is also coupled to the housing and has an apex configured to travel along a line that does not pass through the rotational axis of the gear. The pin is configured to translate between (1) a disengaged position wherein the gear is free to rotate, and (2) an engaged position wherein the apex resides between two of the plurality of teeth to prevent rotation of the gear in both rotational directions. A pin actuator is coupled to the housing and configured to engage the pin to selectively lock the pin in the engaged position.

Abstract: Occurrence of teeth-knocking noises during meshing, attributed to backlash, is reduced. In addition, torque fluctuations, cracks, and overshooting are prevented by deformation of an overhanging section being performed smoothly. A thin-walled section is formed on one end face among two end faces of a tooth in a tooth-width direction. A portion of the thin-walled section is projected and formed so as to serve as an overhanging section. The overhanging section prevents backlash. Regarding a thickness T3 of the overhanging section, a thickness T2 of a tooth flank corresponding section, and a thickness T1 of a tooth crest corresponding section positioned therebetween, T1<T3<T2 is satisfied. The tooth crest corresponding section having the thinnest thickness T1 is easily deformed. Therefore, deformation of the overhanging section when meshing with a partner gear is performed smoothly without inhibition.

Abstract: The invention concerns a gear for precision devices comprising at least two mutually co-operating toothed wheels (10, 14). The teeth (12, 16) of the two wheels have the same thickness (e) and the teeth of one of them (10) are provided with a radial slot (26) which divides them into half-teeth (22, 24). On of said half-tooth (24) comprises a recess (28) enabling its elastic deformation in case of overloading.

Abstract: A ring gear includes teeth (10) and tooth gaps (12), in which the teeth (10) can be brought vie tooth flanks (14) into engagement with a corresponding pinion. The tooth flanks (14), after a final engagement point (16) of the pinion, from the tooth head (18) toward the tooth base (20), compared to standard tooth flanks (22), are made to approximate a trochoid (24, 26), described by the pinion and projected into a normal section.

Abstract: A structural power transmitting component embodies a shaft and a gear or pulley held threadedly positioned on the shaft by four nuts while interconnected by a torque transmitting wedge and key. The shaft is especially configured to establish structural interrelationships with the nuts, wedge, key and gear so as to facilitate assembly and disassembly of the component as well as to maintain the wedge and key deformed under engagement by the nuts to avoid development of internal clearances during start-up and stoppage of torque transmission to thereby preclude generation of noise during such operational start-up and stoppage of transmission through the component.

Abstract: A gear system which includes a pinion and mating-gear forming a gear pair with a predetermined gear ratio (mG), center distance (C), face-width (Fw), and limiting stresses. The pinion has a pinion tooth number (N1) and a first plurality of teeth, each tooth having a first-tooth profile. The mating gear has a mating-gear tooth number (N2) satisfying the expression N2=mG·N1 and a second plurality of teeth, each tooth having a second-tooth profile. The relative curvature of the first-tooth profile and the second-tooth profile is given by the expression kc·Fc, where Fc is a relative reference curvature function given by the expression Fc=(N1+N2)2/(N1·N2·C), and kc is a relative curvature multiplier which is a function of the gear ratio (mG), the center distance (C), the face-width (Fw), and the limiting stresses.

Abstract: A pitch transfer gear transmission which enables drive to be transmitted from a gear of having one modulus (42) to a gear having another modulus (46) includes at least two gears (12,16) which have a different number of teeth and which are able to rotate relative to one another, so that the teeth of the two gears (12,16) can form a gear modulus of a first value at one part of the periphery of the gear, and a gear modulus of another value at another part of the periphery of the gear. Continuously variable transmissions are formed by providing an input or output gear (42,46) which has a modulus which varies along the length of the gear. Pitch transfer gear assembly (30) engages with the input or output gear (42,46), and is moveable by a mechanism (59) along the length of the gear changing modulus, so as to set the drive ratio of the transmission.

Abstract: A clutch gear having a boss part with a spline which is formed on an outer peripheral surface of the boss part formed on an axial end surface of the clutch gear having jaw clutch teeth formed on an outer peripheral surface thereof, in which the boss part, with the spline formed on outer peripheral surface thereof, is formed integrally and coaxially with the clutch gear having the jaw clutch teeth formed on the outer peripheral surface thereof by forging, the diameter of the boss part is shorter than that of the clutch gear, and an end part of an effective portion of the spline comes to at least an end surface of the clutch gear.

Abstract: A gear made of a resin includes a substantially cylindrical rim having a plurality of teeth formed around an outer periphery thereof, a boss formed about a rotational center of the rim, and a web connecting the boss and the rim to each other. At least one groove is defined along outer surface of each tooth to divide the tooth in a widthwise direction of the tooth. As a result, a portion of the gear, in which the grooves are defined, is deformed in a reduced amount, leading to a reduced amount of deformation such as a warpage or sink in the entire gear, thereby providing an enhancement in tooth flank accuracy. Since the grooves are defined along the outer surfaces of the teeth, a lubricant such as grease can be supplied effectively to tooth flanks by previously applying the lubricant in the grooves.

Abstract: A tumbler gear having radial serrations on which, during the operation of the chain running gear, roll guide elements of a chain. The radial serrations are made at least in sections of a noise-dampening material. The radial serrations are an integral form of an elastomer form body into which is integrated a support-ring structure made of an inherently stable metallic material with an annular tooth-system structure, the pitch of which corresponds with the pitch of the radial serrations.

Abstract: An optimally finished gear has a surface roughness between approximately 5 micro-inches Ra to 10 micro-inches Ra. The reduced surface roughness, when located at the gear teeth, can reduce the maximum contact stress by more than fifty percent. Similarly, the subsurface shear stress can be reduced by approximately thirty percent. The reduced contact stress and reduced shear stress results from improved lubrication conditions between the gear teeth. Surface roughness greater than 10 micro-inches Ra results in increased contact of the surface peaks, while surface roughness lower than 3 micro-inches is too smooth to retain adequate lubrication between the gear teeth.

Abstract: A toothed gear includes an outer toothed rim 1, a hub 3 and a profiled bridge area 2 connecting the toothed rim 1 and the hub 3 as one piece. The bridge area 2 is connected to the toothed rim and the hub in different planes. The bridge area consists of uniformly spaced, spoke-like bridges 2, which are uniformly distributed over the circumference. The bridges are arranged in an alternating manner on both sides of a center plane extending through the toothed gear.

Abstract: A noise-reduction structure for use with a meshing gear assembly includes a toothed disk that is supported on a first gear so as to be frictionally engaged therewith, but rotationally and radially movable relative thereto. The circumferential width of each tooth formed on the toothed disk is preferably larger than the circumferential width of each tooth formed on the first gear, and the outer diameter of the toothed disk can be larger than the outer diameter of the first gear. The first gear and the toothed disk mesh with a second gear such that as the second gear rotates, the toothed disk and the first gear also rotate. However, the toothed disk and the first gear rotate at different speeds because the difference in the number of teeth formed thereon. Because the teeth formed on the toothed disk have a larger circumferential thickness and a larger outer diameter than the teeth formed on the first gear, a tight meshing engagement with the second gear is provided.

Abstract: In an involute tooth profile pair structure, a pinion has a smaller pressure angle at its addendum than at its dedendum, and a pressure angle at an addendum of a gear wheel is equal to the pressure angle at the dedendum of the pinion, and a pressure angle at a dedendum of the gear wheel is equal to the pressure angle at the addendum of the pinion.

Abstract: An inspection apparatus (40) for remote inspection of the trepan radius area (34) of the inlet sleeve (24) of a steam turbine (10). The apparatus (40) provides a sealed volume (50) between a pair of inflatable bladders (46,48) for the introduction of a liquid couplant for the immersion of ultrasonic transducers (42,44). A laser line generator (62) generates a beam of light visible through camera (60) which impinges upon the inlet bell seal (30) when the apparatus (40) is in a proper inspection position within the inlet sleeve (24). Guide vanes (56) provide centering and generate an insertion force during air assisted insertion of apparatus (40). Transducers (42,44) are indexed axially and circumfretially by the independent rotation of axial drive gear (72) and longitudinal drive gear (70) engaged with a pattern of gear teeth (69) formed as a combination of circumferential spur gear teeth and axial rack gear teeth cut into a single surface of a spline shaft (68).