Abstract: The invention provides a shaft for a roller wheel which is excellent in strength and can achieve a weight saving. The invention provides a shaft for a roller wheel which rotatably supports a roller (3) outward fitted between both end portions (5a, 5b) in a state in which both end portions (5a, 5b) are fixed, and receives a load in a diametrical direction via the roller (3). Recess portions (6, 6) are provided on a side to which the load is not applied, on an outer peripheral surface corresponding to the roller (3). The load applying direction is a vertical direction. A cross sectional shape of the shaft in the recess portions (6, 6) is formed in a shape which is constituted by an upper circular arc portion (10) on an upper side, a lower circular arc portion (11) on a lower side, and a vertical connection portion (12) passing through a shaft axis (0) and connecting the upper circular arc portion (10) to the lower circular arc portion (11).

Abstract: The invention provides a shaft for a roller wheel which is excellent in strength and can achieve a weight saving. The invention provides a shaft for a roller wheel which rotatably supports a roller (3) outward fitted between both end portions (5a, 5b) in a state in which both end portions (5a, 5b) are fixed, and receives a load in a diametrical direction via the roller (3). Recess portions (6, 6) are provided on a side to which the load is not applied, on an outer peripheral surface corresponding to the roller (3). The load applying direction is a vertical direction. A cross sectional shape of the shaft in the recess portions (6, 6) is formed in a shape which is constituted by an upper circular arc portion (10) on an upper side, a lower circular arc portion (11) on a lower side, and a vertical connection portion (12) passing through a shaft axis (O) and connecting the upper circular arc portion (10) to the lower circular arc portion (11).

Abstract: A seal assembly has simple assembly structures, and provides secure sealing effects. A crawler-track connection structure allows the seal assembly to be easily mounted, and securely prevents overflow of a lubricant and the like to the outside. A pair of seal rings (1) and (1) individually having lip portions (23) and (23) are disposed such that each of the lip portions (23) and (23) protrudes in a direction opposing an axial direction, and a load seal ring (2) is compressed and inserted between the pair of seal rings (1) and (1). The load seal ring (2) exerts reaction forces on the pair of lip portions (23) and (23) outwardly in the axial direction.

Abstract: To provide a roller for a crawler type traveling vehicle. The manufacture of this roller is streamlined by simplifying a structure for holding a seal mechanism between a bearing part and the outside and a thrust bearing and facilitating working while eliminating the need for welding. Roller pieces shaped to be axially separable are combined with a support shaft and formed integrally at a parting section (including a stepped engagement part and an external engagement part) by press fitting. The support shaft is provided with a projection for restraining the left and right roller pieces from moving in an axial direction.

Abstract: An equalizer bar itself serving as a suspension device of a track-type vehicle has spring effects imparted through torsional deformation relative to vertical oscillatory movements of track frames. Arm portions are fixed in directions opposite to each other in two ends of an equalizer bar main body. Free end portions of the arm portions are individually supported in the track frames to be rotatable in directions opposite to each other. The track frames are therefore regulated in the magnitudes of oscillatory movements according to the spring effects of the equalizer bar main body, whereby travel-time oscillations, oscillatory movements, and/or the like of the vehicle body are sufficiently restrained.

Abstract: To provide a bearing device, which can be easily processed, and whereby, its durability is capable of being improved and a load (tractional force) can be remarkably increased till the burn-in occurs and a pin for the bearing device. The bearing device is provided with a bush and a pin to be inserted in this bush. When an external force is acting in a certain direction, the bush and the pin are relatively rocked, and a slidable range H is formed, in which an outer peripheral face of the pin and an inner peripheral face of the bush partially and slidably contact with each other. An oil reservoir is provided at the side of the pin in order to prevent a no-lubrication portion, to which no lubrication oil is supplied, from being formed in the slidable range H.

Abstract: The present invention is an elastic flat tread which can prevent an elastic solid from cracking even if the vehicle runs on a protruding object during traveling. For this purpose, the elastic flat tread is provided with any core (1, 11, 115) of a core (1, 11) attached to a link (6) and a core (115) attached to a metal plate (9A) which is attached to a link (8), and end portions (1a, 1b; 11a, 11h; 115a, 115b) in a longitudinal direction of the aforesaid any core (1, 11, 115) are bent toward the side not in contact with the around.

Abstract: A tracked travel device in which a track configured by attaching track shoes to a plurality of track links linked in endless fashion by link pins is wound on a sprocket wheel, an idler tumbler, track rollers and carrier rollers that are provided on a track frame or in the vicinity of the track frame, and which is capable of reliably reducing the noise caused by impact of the track with the carrier rollers. A plurality of carrier rollers are provided on the track frame with a center distance of adjacent carrier rollers in a range of 1.0 times to 2.0 times a link pitch of adjacent link pins in the track.

Abstract: The present invention is an elastic flat tread which can prevent an elastic solid from cracking even if the vehicle runs on a protruding object during traveling. For this purpose, the elastic flat tread is provided with any core (1, 11, 115) of a core (1, 11) attached to a link (6) and a core (115) attached to a metal plate (9A) which is attached to a link (8), and end portions (1a, 1b; 11a, 11h; 115a, 115b) in a longitudinal direction of the aforesaid any core (1, 11, 115) are bent toward the side not in contact with the ground.

Abstract: A seal assembly has simple assembly structures, and provides secure sealing effects. A crawler-track connection structure allows the seal assembly to be easily mounted, and securely prevents overflow of a lubricant and the like to the outside. A pair of seal rings (1) and (1) individually having lip portions (23) and (23) are disposed such that each of the lip portions (23) and (23) protrudes in a direction opposing an axial direction, and a load seal ring (2) is compressed and inserted between the pair of seal rings (1) and (1). The load seal ring (2) exerts reaction forces on the pair of lip portions (23) and (23) outwardly in the axial direction.

Abstract: The invention provides a support roller of a crawler type traveling apparatus which can prevent a rotational resistance from being increased by the soil or the like, and can stably achieve a function serving as the support roller for a long time. The invention provides a support roller of a crawler type traveling apparatus provided with a shaft (1), a support portion (2) supporting a center portion in an axial direction of the shaft (1), and a pair of rollers (3, 3) respectively arranged in both end portions (1a, 1a) of the shaft (1) and rotating together with the shaft (1). A mounting seat portion (36) of the support portion (2) to a track frame (51) is set within a range (S) of a roller outer shape formed by a pair of rollers (3, 3) in a plan view.

Abstract: An link of a caterpillar which is allowed to maintain stabilized durability for a long period. The fixing structure has a link, and a pin inserted into a pin inserting bore formed in the link. A peripherally extending concave groove formed on the end portion of the pin and an opening periphery conjugate to forms an annular space. In order to limit relative escaping motion of the pin in the off-opening side (toward receding direction), a escape limiting ring is fitted into the annular space. The hardness of the bottom surface of the peripherally extending concave groove is lowered than the surface hardness of a link engaging portion of the pin.

Abstract: In a crawler belt comprising pairs of opposite links connected endlessly via pins press-fitted into the links, fixing surfaces of pins or links are successively pressed and deformed from the fixing surfaces in an axial direction along the circumferences inside or outside of openings of pin-press-fitting holes by means of local pressing in the axial direction, whereby the end portions of the pins or part of the circumferences of the openings in the links are expanded or narrowed in diameter. The expanded or narrowed portions are fixedly engaged with the opposing engaging spaces. The surface hardness of the expanded or narrowed portions is set to be lower than that of the other portions. With such structure and method, the links and pins can be easily and firmly connected with sufficient holding force in the axial direction, securing accurate, quick and easy fixing of pins and assembling of pins and links.

Abstract: The invention provides a crawler type traveling apparatus which can be stably used for a long time period, and furthermore provides a crawler belt sprocket and a segment thereof which is best suited for the crawler type traveling apparatus. A crawler type traveling apparatus is provided with a crawler belt (3) and a crawler belt sprocket (2). The crawler belt (3) is structured such that a plurality of links (4) are connected via a bearing structure body (5) having a pin (7) a bush (8) which is outward fitted to the pin (7), and seal member (10, 10) which are arranged in both end sides of the bush (8). Guide portions (G, G) making an intrusion into a portion between the relatively facing links (4, 4) are protruded from both side surfaces of the sprocket (2). The sprocket (2) is connected via the bearing structure body (5), and a gear tooth portion (26) thereof makes an intrusion into the portion between the relatively facing links (4, 4) so as to be engaged with the bush (8).

Abstract: A seal assembly has simple assembly structures, and provides secure sealing effects. A crawler-track connection structure allows the seal assembly to be easily mounted, and securely prevents overflow of a lubricant and the like to the outside. A pair of seal rings (1) and (1) individually having lip portions (23) and (23) are disposed such that each of the lip portions (23) and (23) protrudes in a direction opposing an axial direction, and a load seal ring (2) is compressed and inserted between the pair of seal rings (1) and (1). The load seal ring (2) exerts reaction forces on the pair of lip portions (23) and (23) outwardly in the axial direction.

Abstract: A crawler track is provided which is improved in the service life of bushings engaging a driving wheel (sprocket) of a track type vehicle, thereby reducing the running cost and which can be used under high loading conditions and therefore has a wide range of applications covering all types of machines from small-sized to large-sized work machines. In the crawler track of the track type vehicle having a track chain composed of a plurality of track links each having a pair of links spaced apart from each other in a lateral direction and a pin for coupling the pair of links, the track links being connected in the form of a loop by their pins, each bushing engaging the driving wheel (sprocket) is rotatably mounted to its associated pin and a beam for coupling the pair of links is disposed at the center of the space between every adjacent pins.

Abstract: In a track with a rotatable bushing which is brought into engagement with a sprocket of a track-type vehicle, it is intended that strength is enhanced rationally by link functionality sharing and by combination of such assigned functional tasks for achieving further improvements in rotatable bushing function. To this end, a track link comprises a combination of an external link and an internal link; a coupler pin hole is provided through the external link; a bushing hole is provided through the internal link, and the thickness dimension of a bushing hole formation part of the internal link is made greater than that of a coupler pin formation part of the external link.

Abstract: Vibration or the like is prevented for long-term use by normalizing, with operation continuing, a tread of a crawler belt link through grinding in an early stage where uneven wear such as corrugated wear occurs. With a crawler belt of a crawler vehicle wound, an abrasive plate for grinding the tread of the crawler belt link is disposed to contact the tread. While the crawler vehicle does normal traveling work, the abrasive plate corrects the tread of the crawler belt link for the uneven wear. The vibration of a vehicle body can thus be prevented during travel with no uneven wear produced.