JP2019070349A - Gear pump unit - Google Patents

Abstract

To provide a gear pump unit which is high in practicality.SOLUTION: In a break-in process for forming a gear track in order to eliminate a clearance between a pair of gears and a housing, a gear pump main body 12 is operated in a state that a flow of fluid to a first flow passage 52 for making the fluid discharged from the gear pump main body 12 flow to the outside is prohibited, and chips generated between the pair of gears and the housing are discharged from a second flow passage 54. Since the gear track can be formed without making the chips flow to the first flow passage 52 in a state that the gear pump main body 12 is assembled to a pump body 14, and oil performance inspection only needs to be performed once, the break-in processing in a manufacturing stage can be efficiently performed compared with a conventional break-in process of the gear pump unit.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a gear pump unit that includes a gear pump that discharges fluid by rotating a pair of gears.

  The following Patent Document 1 describes an external gear pump. The external gear pump is housed in the housing with a pair of gears, each being an external gear, meshed with one another, and operates by the rotation of one of the pair of gears by a drive source. A hydraulic pressure chamber is formed by the pair of gears and the portion of the housing in which they are housed, and when the pair of gears is rotated, fluid is drawn from the suction port to the hydraulic pressure chamber At the same time, fluid is discharged from the fluid pressure chamber to the discharge port.

  In the gear pump, when there is a clearance between the pair of gear pumps and the housing, fluid leaks from the discharge port side to the suction port side. Therefore, conventionally, in the manufacturing stage, after assembling the gear pump, a process called break-in is performed. In the break-in process, the gear pump is operated in a defined manner to cut the inside of the housing by rotation of a pair of gears to form a gear track, and the clearance between the pair of gears and the housing is substantially zero. It is a thing.

  The above gear pump is mounted, for example, as a hydraulic pressure source of a brake system of a vehicle. In that case, the gear pump unit in a state of being assembled together with the drive source of the gear in a housing provided with a valve mechanism etc. for adjusting the flow of the fluid discharged from the discharge port of the gear pump when supplying the fluid. The gear pump unit is mounted on a vehicle.

JP, 2009-36160, A

  The above-mentioned gear pump run-in process is carried out first of all by the gear pump alone because chips are discharged, and immediately thereafter, the performance of the gear pump such as the discharge flow rate and the discharge pressure is inspected. Then, after the inspection, the gear pump is assembled to the above-mentioned casing, but after the assembly, it is necessary to inspect the performance such as the discharge flow rate and the discharge pressure again as the gear pump unit. It is thought that the practicability of the gear pump unit can be improved by dealing with the problem of duplication of the number of inspections, and making the gear pump unit capable of an efficient break-in process possible. The present invention has been made in view of such circumstances, and an object thereof is to provide a highly practical gear pump unit.

  In order to solve the above problems, the gear pump unit of the present invention is provided separately from (i) a first flow path for causing the fluid discharged from the gear pump to flow out, and (ii) the first flow path. And a second flow path for operating the gear pump in a state in which the flow of fluid to the first flow path is prohibited, and discharging the chips generated between the housing and the pair of gears. It is characterized by

  According to the gear pump unit of the present invention, it is possible to carry out the break-in step of forming the gear track without flowing chips in the first flow path used in a state where the gear pump unit is mounted in an apparatus or the like. Since the performance inspection can be performed only once, it is possible to efficiently perform the break-in step in the manufacturing stage as compared to the break-in step of the conventional gear pump unit.

It is a perspective view showing the state where the gear pump unit which is an example of the present invention is disassembled. It is a top view of the gear pump unit which is an example of the present invention. It is a figure which shows the gear pump unit shown in FIG. 2 in the viewpoint from upper direction. It is sectional drawing of the gear pump main body shown in FIG. It is side surface sectional drawing of the gear pump main body shown in FIG. It is a conceptual diagram which shows the break-in apparatus for performing the break-in process of the gear pump unit which is an Example of this invention. FIG. 7 is a view for explaining a break-in process of the gear pump unit by the break-in device shown in FIG. 6;

  An embodiment of the present invention will be described in detail below with reference to the drawings as a mode for carrying out the present invention. The present invention is not limited to the following examples, and can be implemented in various modes in which various changes and improvements are made based on the knowledge of those skilled in the art.

  A gear pump Assy 10, which is a gear pump unit according to an embodiment of the present invention, is a hydraulic pump and is mounted on a vehicle as a hydraulic pressure source of a brake system. As shown in FIGS. 1 to 3, the gear pump assembly 10 includes a gear pump body 12 and a pump body 14 to which the gear pump body 12 is assembled.

  The gear pump body 12 is an external gear pump and includes a pair of gears 16 and 18 which are external gears and a housing 20 which accommodates the pair of gears 16 and 18 therein. The housing 20 is formed with a recess 22 having a bowl-like cross-sectional shape, and the recess 22 accommodates a pair of gears 16 and 18. In the recess 22, the cases 24 and 26 are fitted in a liquid tight manner, and the pump chamber 28 is defined by the recess 22 of the housing 20 and the cases 24 and 26. Further, each of the pair of gears 16 and 18 is rotatably held around the axis by the housing 20 and the cases 24 and 26. The housing 20 is provided with a suction port 30 and a discharge port 32. The suction port 30 and the discharge port 32 are positioned opposite to each other across the meshing portion of the pair of gears 16 and 18. And opens into the pump chamber 28.

  One gear 16 of the pair of gears is a drive gear rotated by the motor 40 as a drive source, and the other gear 18 is a driven gear rotated with the rotation of the drive gear 16. As shown in FIG. 4, the drive gear 16 and the driven gear 18 are rotated in opposite directions. Then, in the drive gear 16 and the driven gear 18, the working fluid (brake oil) flows into the positions where the teeth and the teeth separate at the time of rotation, whereby the working fluid is sucked from the suction port 30 into the pump chamber 28. When the pair of gears 16 and 18 further rotates, the working fluid that has entered the tooth space of each pair of gears 16 and 18 is conveyed along the inner wall of the recess 22 to the discharge port 32 side. At the discharge port 32 side, the driving gear 16 and the driven gear 18 mesh with each other to push out the working fluid that has entered the respective tooth gaps of the first pair gears 16 and 18 and discharge it from the discharge port 32. is there.

  The gear pump body 12 is assembled to the pump body 14 as described above. The pump body 14 is provided with an outflow passage 50 which is in communication with the discharge port 32 of the gear pump main body 12 and causes the working fluid discharged from the discharge port 32 to flow out to the outside thereof. The outflow passage 50 is branched into two, a first flow passage 52 and a second flow passage 54. The first flow path 52 is a flow path used in a state mounted on a vehicle, and supplies the flow of the working fluid in a adjusted state. Specifically, the first flow path 52 is provided with a check valve 56 for inhibiting the flow toward the gear pump main body 12, an attenuator 58 for damping the flow of the working fluid, and two cut valves 60 for adjusting the outflow amount. , 62 and a pressure sensor 64 are provided so that the flow of the working fluid supplied from the first flow path 52 is regulated.

  On the other hand, the second flow passage 54 is a passage which directly communicates with the outside of the pump body 14, and unlike the first flow passage 52, a valve mechanism or the like is not provided midway. The second flow path 54 is used in a process in a manufacturing step which will be described in detail later, is not used in a state mounted on a vehicle, and the opening to the outside is blocked.

  Further, as shown in FIG. 3, the motor 40 described above is assembled on the surface of the pump body 14 opposite to the surface on which the gear pump body 12 is assembled, and the rotation shaft of the motor 40 is connected to the drive gear 16. There is.

  In the state where the gear pump body 12 is assembled by only inserting the pair of gears 16 and 18 into the recess 22, there is a clearance between the pair of gears 16 and 18 and the inner wall of the recess 22. Do. When the gear pump main body 12 is operated, the hydraulic pressure on the discharge port 32 side in the pump chamber 28 is higher than the hydraulic pressure on the suction port 30 side. The working fluid will leak from the 32 side to the suction port 30 side. Therefore, conventionally, after assembling the gear pump main body 12 in order to suppress the leakage of the working fluid as described above, in the process for optimizing the position of each of the pair of gears 16 and 18 in the recess 22 A break-in process is taking place.

  The break-in process operates the gear pump body 12 to form the gear track 70 in the recess 22 of the housing 20 to enhance the seal between each of the pair of gears 16, 18 and the recess 22. It is. The gear track 70 will be described in detail. When the gear pump body 12 is operated, the hydraulic pressure on the discharge port 32 side in the pump chamber 28 is higher than the hydraulic pressure on the suction port 30 side. That is, when the gear pump main body 12 is operated, each of the drive gear 16 and the driven gear 18 is urged in the direction of the arrow shown in FIG. Will be In this state, by continuously operating the gear pump body 12, the inside of the recess 22 is scraped, and as shown in FIGS. 4 and 5, the gear track 70 is formed in the recess 22.

  The conventional pump body has only one outflow passage provided with a valve mechanism etc. Therefore, if a break-in process is performed in a state where the gear pump main body 12 is assembled, cutting waste generated by cutting the inside of the recess 22 is , Valve mechanism etc. Therefore, conventionally, the break-in process is performed only with the gear pump main body 12, and thereafter, the pump body is assembled. In such a case, after the break-in process of the gear pump body 12, it is necessary to carry out an oil performance test to measure the discharge pressure, the discharge flow rate, etc. and assemble the gear pump body 12 to the pump body, and then perform the oil performance test again. was there.

  In the following, the step-in process of the gear pump Assy 10 will be described in detail. The break-in process is performed with the gear pump Assy 10 incorporated in the break-in device 100 shown in FIG. The break-in device 100 includes a tank 102 connected to the suction port 30 of the gear pump main body 12 to supply a working fluid, and in the tank 102, the first flow path 52 of the pump body 14 is two communication paths. The first communication passage 104 and the second communication passage 106 communicate with each other, and the second flow passage 54 communicates with the third communication passage 108.

  A first cut valve 110, a second cut valve 112, and a third cut valve 114 are provided in the first communication passage 104, the second communication passage 106, and the third communication passage 108, respectively, to allow the flow of hydraulic fluid It is possible to switch between the operating state and the blocking state. Further, the second communication passage 106 is provided with a performance measurement circuit 116 configured between the second cut valve 112 and the tank 102, including the above-described sensor for performing the oil performance inspection. A pressure adjustment valve 118 is provided in the third communication passage 106 between the third cut valve 114 and the tank 102, and a pump device for supplying the hydraulic fluid from the third cut valve 114 to the gear pump Assy 10 side. A fourth cut valve 122 is provided to switch between a state in which the pump device 120 and the third communication passage 106 are in communication and a state in which the pump device 120 is in communication with the third communication passage 106.

  In the break-in process using the break-in device 100 configured as described above, first, the second communication passage 106 is shut off by the second cut valve 112, and the third communication passage 108 is shut off by the third cut valve 114. The 1 cut valve 110 permits the flow of the hydraulic fluid in the first communication passage 104. Then, the pump device 120 is communicated with the gear pump Assy 10 by the fourth cut valve 122. In that state, the pump device 120 is operated without operating the gear pump body 12. As a result, the working fluid flows along the path shown in FIG. 7A, and the flow path on the discharge side of the gear pump Assy 10 is filled with the working fluid in the gear pump Assy 10 in detail.

  Subsequently, the first communication passage 104 is shut off by the first cut valve 110, and the pump device 120 is also shut off by the fourth cut valve 122, and the flow of the hydraulic fluid in the third communication passage 108 is permitted by the third cut valve 114. Be done. In this state, the gear pump main body 12 of the gear pump Assy 10 is operated, and the discharge pressure is controlled by the pressure adjustment valve 118 (for example, the method described in Japanese Patent Application No. 2009-36160). Formation takes place. Then, as shown in FIG. 7B, the working fluid does not flow in the first flow path 52 of the gear pump Assy 10, but the working fluid flows in the second flow path 54 and the third communication path 108. It is reliably discharged to the outside.

  Finally, as shown in FIG. 7C, the second flow passage 54 of the gear pump Assy 10 and the third communication passage 108 of the break-in device 100 are disconnected, and the opening of the second flow passage 54 is closed. The second cut valve 112 permits the flow of the hydraulic fluid in the second communication passage 106. In that state, the gear pump main body 12 of the gear pump Assy 10 is operated, various items are measured by the performance measurement circuit 116, and an oil performance inspection is performed.

  As described above, the pump gear Assy 10 can form the gear track 70 without flowing cuttings into the first flow path 52 in a state where the gear pump body 12 is assembled to the pump body 14. Further, since the oil performance inspection can be performed only once, the gear pump Assy 10 can perform the break-in process in the manufacturing stage more efficiently than the break-in process of the conventional gear pump Assy described above. is there.

  Although the gear pump assembly 10 of this embodiment is configured to assemble the gear pump main body 12 to the pump body 14, it is not necessary to form the gear track only with the gear pump main body as in the conventional gear pump Assy. The gear pump unit of the invention can be configured such that a pair of gears constituting the gear pump can be directly assembled to the pump body, and the number of parts can also be reduced.

  10: gear pump Assy (gear pump unit) 12: gear pump main body 14: pump body 16: drive gear 18: driven gear 20: housing 22: recess 24, 26: case 28: pump chamber 30: suction port 32: discharge port 40: Motor 50: Outflow passage 52: 1st flow passage 54: 2nd flow passage 56: Check valve 58: Attenuator 60, 62: Cut valve 70: Gear track 100: Break-in device

Claims (1)

A gear pump comprising a housing and a pair of intermeshing gears housed in the housing, the fluid being discharged by rotating the pair of gears;
A first flow path for causing the fluid discharged from the gear pump to flow out;
The gear pump is operated separately from the first flow path and the fluid flow to the first flow path is inhibited, and cutting debris generated between the housing and the pair of gears is generated. The gear pump unit comprised including the 2nd flow path for making it discharge.

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