JP2017206962A - pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively improve the forcible feed efficiency of a pump.SOLUTION: The pump includes a rotor 14 provided on a driving shaft 13 in an integrally rotatable manner, and having a plurality of slit grooves 15 extending in the radial direction, a plurality of rectangular parallelepiped vanes 16 inserted into the plurality of slit grooves 15 in a forward/backward movable manner, respectively, a cam ring 17 which are provided on the outer periphery side of the rotor 14, and with the inner peripheral face of which front end faces 16A of the vanes 16 have slide contact, and housings 11, 12 inside which the rotor 14, the vanes 16 and the cam ring 17 are stored, and with the inside faces of which both side faces 16B, C of the vanes have slide contact. On the side faces 16B, C of the vanes 16 having slide contact with the inside faces of the housings 11, 12, a plurality of dimples 40 are formed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pump, and more particularly to a vane type pump.

  Generally, this type of vane pump includes a rotor having a plurality of radially extending slit grooves, a plurality of vanes inserted in the slit grooves so as to freely advance and retract, and a cam ring provided on the outer periphery of the rotor. (For example, refer patent document 1).

JP 2010-24948 A

  By the way, each vane of the vane pump divides each pump chamber by bringing its tip end surface into sliding contact with the inner peripheral surface of the cam ring and sliding both side surfaces thereof into the inner surface of the housing and the cover. The tip surface of the vane is reliably slidably contacted with the inner peripheral surface of the cam ring by the centrifugal force accompanying the rotation of the rotor. However, since a minute gap is likely to be formed between the both side surfaces of the vane and the inner side surfaces of the housing and the cover, if the fluid in the pump chamber leaks from the gap to another adjacent pump chamber, the pumping efficiency is reduced. There is a problem that causes a decrease.

  The technique of this indication aims at improving the pumping efficiency of a pump effectively.

  The technology of the present disclosure includes a rotor having a plurality of slit grooves extending in the radial direction and provided so as to be integrally rotatable with the drive shaft, and a plurality of rectangular parallelepiped vanes respectively inserted into the plurality of slit grooves so as to freely advance and retract. A cam ring which is provided on the outer peripheral side of the rotor and in which the tip end surface of the vane is slidably contacted with an inner peripheral surface thereof, and the rotor, the vane and the cam ring are accommodated therein, and the vane is disposed on an inner surface thereof. A housing in which both side surfaces of the vane are in sliding contact with each other, and a plurality of dimples are formed on at least one of the side surfaces of the vane in sliding contact with the inner side surface of the housing.

  A plurality of dimples may be formed on the tip surface of the vane that is in sliding contact with the inner peripheral surface of the cam ring.

  A plurality of dimples may be formed on a side surface of the vane that is in sliding contact with the slit groove.

  The cam ring may be further provided on the outer peripheral side of the rotor so as to be able to swing eccentrically, and may further include an eccentric amount adjusting means capable of adjusting an eccentric amount of the cam ring with respect to the rotor.

  According to the technique of the present disclosure, the pumping efficiency of the pump can be effectively improved.

It is a typical whole lineblock diagram showing the pump concerning one embodiment of the present invention. In the pump concerning one embodiment of the present invention, it is a mimetic diagram explaining the state where the amount of eccentricity to the rotor of a cam ring decreased. (A) is a typical sectional view showing a pump concerning one embodiment of the present invention, and (B) is a typical perspective view showing a vane concerning one embodiment of the present invention.

  Hereinafter, based on an accompanying drawing, a pump concerning one embodiment of the present invention is explained. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  As shown in FIG. 1, the pump 10 is a so-called variable displacement vane pump, which has a substantially bottomed cylindrical pump housing 11, a cover 12 that closes the opening of the pump housing 11, and a cylinder in the pump housing 11. A drive shaft 13 inserted through substantially the center, a rotor 14 provided so as to be rotatable integrally with the drive shaft 13, a plurality of vanes 16 inserted in the slit grooves 15 of the rotor 14 so as to be freely advanced and retracted, and the rotor 14 A cam ring 17 provided on the outer peripheral side so as to be able to swing eccentrically, a spring 20 that urges the cam ring 17 in a direction in which the amount of eccentricity with respect to the rotor 14 increases, and a direction in which the amount of eccentricity of the cam ring 17 decreases due to the hydraulic pressure in the hydraulic chamber 21. And a piston 22 that presses against.

  In this embodiment, the pump housing 11 and the cover 12 correspond to the housing of the present invention, and the spring 20, the hydraulic chamber 21 and the piston 22 correspond to the eccentricity adjusting means of the present invention.

  A concave portion 11 </ b> A serving as a pivot point of the cam ring 17 is provided on the inner cylinder surface of the pump housing 11 opposite to the spring 20 to receive the convex portion 17 </ b> A provided on the outer periphery of the cam ring 17. In addition, a suction port 23 is formed on the spring 20 side and a discharge port 24 is formed on the recess 11 </ b> A side at the bottom of the cylinder of the pump housing 11.

  The rotor 14 is formed with a plurality of slit grooves 15 that extend radially in the radial direction. A plurality of vanes 16 are inserted into the respective slit grooves 15 so as to freely advance and retract.

  Each vane 16 is formed in a substantially rectangular parallelepiped shape, and its front end surface 16A is slidably contacted with the inner peripheral surface of the cam ring 17, and both side surfaces 16B and C (see FIG. 3 for 16B) are arranged on the pump housing 11. The inner side surface and the inner side surface of the cover 12 are in sliding contact with each other. That is, a pump chamber that pumps fluid (for example, liquid such as lubricating oil or hydraulic oil) by the vane 16, the outer peripheral surface of the rotor 14, the inner peripheral surface of the cam ring 17, the inner surface of the pump housing 11, and the inner surface of the cover 12. 30 is defined.

  As shown in FIG. 1, in the pump 10 configured as described above, when the cam ring 17 is moved in the eccentric direction by the biasing force of the spring 20 and the amount of eccentricity of the cam ring 17 with respect to the rotor 14 increases, the pump chamber is accordingly accompanied. As the volume of 30 increases, the amount of fluid discharged also increases. On the other hand, as shown in FIG. 2, when the cam ring 17 is moved concentrically by the gallery hydraulic pressure supplied to the hydraulic chamber 21 and the eccentric amount of the cam ring 17 with respect to the rotor 14 decreases, the volume of the pump chamber 30 decreases accordingly. As a result, the discharge amount of the fluid is also reduced.

  In the present embodiment, the vane 16 has innumerable dimples. More specifically, as shown in FIG. 3, the innumerable dimples 40 include a tip end surface 16 </ b> A of the vane 16 that is in sliding contact with the inner peripheral surface of the cam ring 17, a first side surface 16 </ b> B of the vane 16 that is in sliding contact with the inner side surface of the pump housing 11, and The second side surface 12 </ b> C of the vane 16 is in sliding contact with the inner side surface of the cover 12. Each dimple 40 preferably has a hole diameter of 0.005 to 0.1 mm, a depth of 0.005 to 0.015 mm, and an area ratio of 15 to 40%. The tip surface 16A and both side surfaces 16B of the vane 16 are provided. , C are subjected to shot blasting or laser processing.

  As described above, by providing innumerable dimples 40 on the front end surface 16A, the first side surface 16B, and the second side surface 12C of the vane 16, fluid is held in these dimples 40. As a result, three sliding contacts are made between the inner peripheral surface of the cam ring 17 and the tip end surface 16A of the vane, the inner side surface of the pump housing 11 and the first side surface 16B of the vane 16, and the inner side surface of the cover 12 and the second side surface 12C of the vane 16. The surface lubricity is reliably improved, and wear can be effectively suppressed.

  Further, by providing innumerable dimples 40 on the first side surface 16B and the second side surface 12C of the vane 16, a gap is easily formed between the first side surface 16B of the vane 16 and the inner side surface of the pump housing 11, and the vane 16 The pressure between the second side surface 16 </ b> C and the inner surface of the cover 12 is increased. As a result, it is possible to effectively prevent the fluid in the pump chamber 30 from leaking out to the other adjacent pump chambers 30, and the pumping efficiency of the pump can be reliably improved.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, the position where the dimple 40 is provided is not limited to the tip surface 16A and the side surfaces 16B and C of the vane 16, but the inner surface of the pump housing 11, the inner surface of the cover 12, the inner peripheral surface of the cam ring 17, and the like. It can also be provided in other parts that are in sliding contact. In this case as well, the same operational effects as in the above embodiment can be obtained.

  The dimples 40 may be formed on the side surface of the vane 16 that is in sliding contact with the slit groove 15 or on the entire surface of the vane 16. If the dimples 40 are provided in this manner, the lubricity between the vane 16 and the slit groove 15 can be improved in addition to the operational effects of the above embodiment.

  Moreover, the formation method of the dimple 40 is not limited to shot blasting or laser processing, but can be formed by other methods.

  The pump 10 of the above embodiment is not limited to a variable displacement vane pump, and may be a fixed displacement vane pump.

DESCRIPTION OF SYMBOLS 10 Pump 11 Pump housing 12 Cover 13 Drive shaft 14 Rotor 15 Slit groove 16 Vane 16A Front end surface 16B First side surface 16C Second side surface 17 Cam ring 20 Spring 21 Hydraulic chamber 22 Piston 23 Suction port 24 Discharge port 30 Pump chamber 40 Dimple

Claims (4)

A rotor having a plurality of slit grooves provided in the drive shaft so as to be integrally rotatable and extending in the radial direction;
A plurality of vanes respectively inserted into the plurality of slit grooves so as to freely advance and retract;
A cam ring that is provided on the outer peripheral side of the rotor and in which the front end surface of the vane is in sliding contact with the inner peripheral surface thereof;
A housing in which the rotor, the vane, and the cam ring are housed, and both side surfaces of the vane are in sliding contact with the inner surface thereof,
A pump characterized in that a plurality of dimples are formed on at least one of the two side surfaces of the vane that are in sliding contact with the inner side surface of the housing. The pump according to claim 1, wherein a plurality of dimples are formed on a front end surface of the vane that is in sliding contact with an inner peripheral surface of the cam ring. The pump according to claim 1, wherein a plurality of dimples are formed on a side surface of the vane that is in sliding contact with the slit groove. The said cam ring is provided in the outer peripheral side of the said rotor so that eccentric rotation is possible, and is further provided with the eccentric amount adjustment means which can adjust the eccentric amount with respect to the said rotor of the said cam ring. Pump.

Images