Abstract: Damage of a rotor and a side plate are suppressed with a simple construction to prevent reduction in durability of a vacuum pump. A casing manufacturing method comprises a step (step S2) of disposing a cylinder liner forming a cylinder chamber in a mold, and casting a casing main body integrally with the cylinder liner by using molten metal, and a step (step S3) of processing an intercommunication hole and an exhaust hole so that the intercommunication hole and the exhaust hole penetrate through both the cylinder liner and the casing main body together and intercommunicate with the cylinder chamber.

Abstract: Disclosed is a vehicle compressed air supply device, comprising pressure maintenance valves for service brakes, which are positioned between a junction chamber and compressed air channels for primary brakes; a pressure maintenance valve for the parking brake, which is positioned between the junction chamber and a compressed air channel for the parking brake; and a pressure maintenance valve, positioned on a supply path that connects the pressure maintenance valve for the parking, brake with the junction chamber, and which is closed until the pressure of the compressed air that is supplied to the compressed air channels for the primary brakes reaches a prescribed pressure value. The pressure maintenance valve has the same structure as the pressure maintenance valves for service brakes and the pressure maintenance valve for the parking brake.

Abstract: It is intended to provide a vacuum pump so that without upsizing the vacuum pump, noise and vibration are reduced, heat dissipation property is secured, and the casing is downsized. Therefore, at least one turning part is provided in an exhausting path formed in a casing body. The casing body is formed of a material whose thermal conductivity is higher than that of a rotor and vanes, and a cylinder part where the vanes slide is press fitted in the casing body.

Abstract: A protection valve includes: an input chamber into which air is introduced; a plurality of output ports through which air is discharged; and safety valves which open in response to a pressure increase on a primary side or close in response to a pressure decrease on a secondary side, the safety valves including a safety valve PV21 and a safety valve PV23. An air flow path from the input chamber is branched into a first branch line and a second branch line, and a time lag-creating valve having an opening pressure higher than the safety valve PV21 is provided at a upstream of the safety valve PV23 in the second branch line, so that the safety valve PV23 can open with a time lag after the safety valve PV21 opens, regardless of the difference between the opening pressures of the safety valves PV21 and PV23.

Abstract: A structure for a spring chamber is formed by connecting a chamber case and a return spring housing case and includes a piston member and a push rod. The piston member has a spring receiving section which holds a power spring inside the chamber case and a cylinder body section which is interlocked with the spring receiving section. A diaphragm is arranged inside a return spring housing case chamber in the return spring housing case, defines a pressure medium chamber, and is deformed by an advancing and retracting operation of the cylinder body section. The push rod member advance and retract with an operation of the diaphragm, and performs braking or releasing of a brake. The push rod member is formed with integral molding of a push plate and a axle body section with aluminum material.

Abstract: The operation of an air compressor is controlled to control engine performance to thereby improve the performance of the vehicle. A compressor (4) driven by an engine (3) of a vehicle and supplying compressed air to loads (51-54) is controlled by an ECU (2). A loaded state and an unloaded state of the compressor (4) are switched between each other according to the requirements from the loads (51-54). When the vehicle requires braking force, the compressor (4) is set to the loaded state irrespective of the requirements from the loads (51-54).

Abstract: The operation of an air compressor is controlled to control engine performance to thereby improve the performance of the vehicle. A compressor (4) driven by an engine (3) of a vehicle and supplying compressed air to loads (51-54) is controlled by an ECU (2). A loaded state and an unloaded state of the compressor (4) are switched between each other according to the requirements from the loads (51-54). When the vehicle requires braking force, the compressor (4) is set to the loaded state irrespective of the requirements from the loads (51-54).

Abstract: An oil separator is provided that makes it possible to minimize the number of times of operation for recovering separated oil. The oil separator separates and recovers oil by causing air that contains oil and has been introduced into a casing to strike an impingement member. The oil separator supplies the oil that has been separated from the air to the oil pan of an engine, thereby allowing the oil to be used as lubricant for the engine.

Abstract: An air dryer includes a supporting base, a drying agent container, and an outer cover. The supporting base includes an inlet for receiving compressed air to be subject to a drying process and an outlet for delivering the processed compressed air that has undergone the drying process. The drying agent container is a container supported on the supporting base, contains a drying agent in the interior, and enables the drying process to be performed by passing the compressed air from the inlet through the drying agent. The outer cover surrounds the outer side of the drying agent container on the supporting base and defines a chamber for storing the compressed air between itself and the drying agent container. The supporting base includes first and second mounting surfaces, which are oriented in different directions, and a plurality of inlets, which are oriented in different directions and receive the compressed air.

Abstract: Durability of a vacuum pump is prevented from degrading by suppressing abrasion of a rotor and a side plate. The vacuum pump has a hollow cylinder chamber S having an opening at an end portion of a casing body, a rotor which is rotationally driven in the cylinder chamber S, a side plate for blocking the opening of the cylinder chamber S, and a pump cover which is disposed at the opposite side to the rotor so as to sandwich the side plate between the pump cover and the rotor, and the side plate is provided with an intercommunication port which confronts a shaft hole of the rotor and intercommunicates with a space between the side plate and the pump cover.

Abstract: An oil separator is provided with a housing having an inlet for air, an expansion chamber provided inside the housing, and a heating device for heating the lower part of the expansion chamber. The oil separator introduces, into the housing, air containing oil that has passed through the inlet, and separates and recovers the oil from the air that has been introduced. The transverse cross-sectional area of the expansion chamber is larger than the opening area of the inlet.

Abstract: An oil separator is provided with a case that has an air inlet and a plurality of expansion chambers formed within the case. Air that contains oil is introduced into the case via the inlet and caused to strike a impingement plate to thereby separate the oil from the introduced air and recover the oil. The transverse cross-sectional area of each expansion chamber is greater than the open area of the inlet. Partition walls with orifice holes formed therein are provided between the expansion chambers.

Abstract: An oil separator is provided with a housing having an inlet for air, and an expansion chamber located inside the housing. The oil separator introduces air containing oil that has passed through the inlet into the housing, and separates and recovers the oil from the introduced air. The transverse cross-sectional area of the expansion chamber is larger than the opening area of the inlet. The oil separator is further provided with a collected liquid storage portion that is located below the expansion chamber and collects the separated oil, a liquid communication portion having a communication hole that connects the expansion chamber to the collected liquid storage portion, and a mounting and dismounting mechanism for mounting and dismounting the collected liquid storage portion to and from the housing.

Abstract: An air dryer includes a supporting base, a drying agent container, and an outer cover. The supporting base includes an inlet for receiving compressed air to be subject to a drying process and an outlet for delivering the processed compressed air that has undergone the drying process. The drying agent container is a container supported on the supporting base, contains a drying agent in the interior, and enables the drying process to be performed by passing the compressed air from the inlet through the drying agent. The outer cover surrounds the outer side of the drying agent container on the supporting base and defines a chamber for storing the compressed air between itself and the drying agent container. The supporting base includes first and second mounting surfaces, which are oriented in different directions, and a plurality of inlets, which are oriented in different directions and receive the compressed air.

Abstract: A brake chamber includes a rod member that makes reciprocating motion within a cylinder through a pressure of compressed air or an urging force of a spring, thereby causing a pushrod for activating a brake device of a vehicle to proceed into the brake device. The brake chamber further includes a diaphragm that deforms in response to supply of the compressed air to push the rod member, and a housing that forms an accommodation space for the diaphragm. The housing is connected to the cylinder with a first end of the cylinder being inserted in the housing. The brake chamber further includes a boot member connected to the cylinder and the rod member. The boot member includes a sealing portion to prevent entry of foreign matter into a connection portion between the housing and the cylinder by contacting an inner circumferential surface of the housing.

Abstract: An oil suppressing structure in an air drying device for removing oil which rises in an interior of the air drying device used in a vehicle compressed air brake system includes an outer case 21, a drying case 22 in an interior of the outer case 21, a base plate 23 fixed to a lower end portion 21a of the outer case 21, and an outer cover 24 fixed to a lower end portion 21a of the base plate 23. The drying case 22 has a large-diameter long cylindrical body portion 22A and a small-diameter long cylindrical body portion 22B. A particulate desiccating agent 25 is filled in an interior of the large-diameter cylindrical body portion 22A. An oil adsorbing material 27 is inserted in a space S3 between an inner wall of the outer case 21 and the small-diameter long cylindrical body portion 22B of the drying case 22.

Abstract: Damage of a rotor and a side plate are suppressed with a simple construction to prevent reduction in durability of a vacuum pump. A casing manufacturing method comprises a step (step S2) of disposing a cylinder liner forming a cylinder chamber in a mold, and casting a casing main body integrally with the cylinder liner by using molten metal, and a step (step S3) of processing an intercommunication hole and an exhaust hole so that the intercommunication hole and the exhaust hole penetrate through both the cylinder liner and the casing main body together and intercommunicate with the cylinder chamber.

Abstract: A protection valve includes: an input chamber into which air is introduced; a plurality of output ports through which air is discharged; and safety valves which open in response to a pressure increase on a primary side or close in response to a pressure decrease on a secondary side, the safety valves including a safety valve PV21 and a safety valve PV23. An air flow path from the input chamber is branched into a first branch line and a second branch line, and a time lag-creating valve having an opening pressure higher than the safety valve PV21 is provided at a upstream of the safety valve PV23 in the second branch line, so that the safety valve PV23 can open with a time lag after the safety valve PV21 opens, regardless of the difference between the opening pressures of the safety valves PV21 and PV23.

Abstract: A pressure governor includes a first valve that determines the introducing pressure and a second valve that determines the releasing pressure. A first valve receiving chamber in which the first valve is received and a second valve receiving chamber in which the second valve is received are formed independently from each other. Thus, there is no need to form the valves coaxially, and each valve can be easily fabricated with high accuracy by simple processing.

Abstract: An external cover of a replaceable cartridge forms at least a portion of an air drying apparatus of a compressed air brake for a vehicle. A first slope is formed at an intermediate position between an extremity of a rising piece and a bottom of an external cover, and a left vertical wall is formed. A right vertical wall is formed opposite the left vertical wall. A top face is formed between the left vertical wall and the right vertical wall. An indentation is defined by the left vertical wall, the right vertical wall, and the top face. A sealing member is fitted into the indentation. A circular-arc portion is formed at a lower end of the right vertical wall. A second slope is formed in an extending manner at a predetermined height from a lower end face that is an intermediate position on a height of the external cover.