JP2013107546A - Hydraulic control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic control unit capable of optimizing the flow of a pressure medium around a piston pump without further working the inside of an open hole of a housing.SOLUTION: The hydraulic control unit includes: the open hole 31f formed on the housing 30; the piston pump which is accommodated in the open hole 31f and forcibly feeds the pressure medium; a pump closing cover 55 which tightly closes the piston pump into the housing 30 and guides the pressure medium; and a channel 11b which is formed in the housing 30 so as to receive the pressure medium flowing out of the pump closing cover 55. The pump closing cover 55 is provided with a plurality of outer circumferential groove parts 55b in order to cause the pressure medium to flow through the channel 11b from an inner part of the pump closing cover 55.

Description

  The present invention relates to a hydraulic control unit for an automobile or a motorcycle, and more particularly to a flow path structure in the hydraulic control unit.

  A hydraulic control unit for automobiles and motorcycles is disposed between a master cylinder and a wheel cylinder, controls the pressure of a pressure medium (brake fluid) supplied from the master cylinder to the wheel cylinder, and locks the wheel. Braking is performed with the vehicle's antilock braking system (ABS). Further, the hydraulic control unit includes a flow path that connects the master cylinder and the wheel cylinder, a plurality of electromagnetic switching valves that switch the flow of the pressure medium flowing in the flow path, and controls the electromagnetic switching valve to control the pressure medium. An electronic control unit for controlling the pressure, and a pump for returning the pressure medium from the wheel cylinder to the master cylinder.

  Japanese Patent Laying-Open No. 2011-51359 is an application by the present applicant, and includes a hydraulic pressure control unit 10 as shown in FIG. With reference to FIG. 2 to FIG. 4 in addition to FIG. 1, the structure of the hydraulic pressure control unit which is the premise of the present invention will be described.

  FIG. 1 is an exploded perspective view showing the configuration of the hydraulic pressure control unit 10. The hydraulic pressure control unit 10 includes a housing 30, a front wheel EV valve 1, a front wheel AV valve 2, a rear wheel EV valve 3, a rear wheel AV valve 4, and a pressure sensor 13 that detects pressure medium pressure. A pair of piston pumps 5a and 5b that pressurize the pressure medium, an ECU 8 that drives and controls the valves 1 to 4 and the like, a motor 7 that drives the piston pumps 5a and 5b, and reservoirs 9 and 12 that receive the pressure medium. Prepare.

  The housing 30 is made of, for example, a metal such as aluminum, and is formed from a substantially rectangular parallelepiped block. In addition, a flow path including a front wheel flow path and a rear wheel flow path is formed inside the housing 30. In addition, a plurality of attachment holes that communicate with the front wheel and rear wheel passages are formed on a plurality of side surfaces of the housing 30.

  FIG. 2 is a cross-sectional view of the main part showing the flow path structure of the hydraulic pressure control unit of FIG. In FIG. 2, only the cross-sectional structure regarding the hydraulic circuit for front wheels is shown. The cross-sectional structure related to the hydraulic circuit on the rear wheel side omitted in FIG. 2 is a substantially line-symmetric structure with the right side of the cross section shown in FIG. 2 as the center line.

  In FIG. 2, the housing 30 is in contact with the piston pump housing opening 31 f formed in one side surface 30 b, a piston drive member (eccentric cam) 51 that changes the rotation of the motor 7 to eccentric motion, and the piston drive member 51. A piston 52 that reciprocates in conjunction with the movement, a piston housing member 53 that houses the left end side of the piston 52, a suction valve 60 that is disposed in the piston housing member 53 and sucks the pressure medium from the reservoir 9, and a piston A suction valve 60 provided in the housing member 53, a filter 61 provided in the piston housing member 53 for filtering the pressure medium flowing from the flow path 11 a to the suction valve 60, and a pump closing cover 55 attached to the left end side of the piston housing member 53. Between the piston housing member 53 and the pump closing cover 55 And a valve 70. The piston pump 5a in FIG. 1 includes the piston driving member 51, the piston 52, the suction valve 60, the filter 61, the piston housing member 53, and the discharge valve 70 in FIG.

  The pressure medium flows from the reservoir 9 through the flow path 11a into the space between the opening 31f and the piston accommodating member 53, and from the space, through the filter 61, the suction valve 60, and the discharge valve 70, which will be described later. It flows out into the downstream flow path 11b through the recess portion 32.

  The pressure medium is sent to the downstream flow path 11b discharged by the operation of the radial piston pump 5a. However, there are cases where the pump discharge section and the downstream flow path 11b of the hydraulic circuit cannot be directly connected due to design restrictions. Thus, when the flow path of the pressure medium is shielded by the piston pump, a recess portion (undercut portion) 32 is formed by cutting the inner surface of the opening 31f on the housing 30 side which is a metal block, thereby forming the flow path. I was trying.

  FIG. 3 is an enlarged perspective view of the piston pump housing opening 31 f formed in the side surface 30 b of the housing 30. In FIG. 3, the opening 31f is a cylindrical space, but a recess 32 is formed on the inner surface thereof.

  FIG. 4 is an enlarged cutaway view of the housing 30 showing the pressure medium flowing around the recess 32. The pressure medium flows from the pump discharge portion 55a formed on the inner surface of the bottomed cylindrical pump closing cover 55 to the downstream flow path 11b through the recess portion 32 as indicated by an arrow in FIG.

JP 2011-51359 A

  In the structure as shown in FIG. 4, an additional processing blade and an additional cutting process are required to form the recess portion 31a, and the processing time and cost increase. In addition, a space is required in the housing in order to cut and form the recess, and there is a possibility that the design such as the arrangement of the flow path around the recess will be restricted.

  Therefore, an object of the present invention is to provide a hydraulic pressure control unit that can optimize the flow of the pressure medium around the piston pump without further processing the inside of the opening of the housing.

  In order to solve the above problems, a hydraulic control unit according to the present invention includes an opening formed in a housing, a piston pump accommodated in the opening and pumping a pressure medium, and the piston pump sealed in the housing. And a fluid pressure control unit having a pump closing cover for guiding the pressure medium, and a flow path formed in the housing to receive the pressure medium flowing from the pump closing cover. A plurality of outer peripheral groove portions are provided for flowing the pressure medium from the inside to the flow path.

  The plurality of outer peripheral groove portions are provided at equal intervals on the outer peripheral surface of the pump closing cover. The plurality of outer peripheral groove portions are provided in parallel with a longitudinal axis of the pump closing cover. The plurality of outer peripheral groove portions are provided on the opening end side of the pump closing cover.

  The pump closing cover includes a plurality of inner peripheral groove portions for flowing the pressure medium from the discharge valve to the outer peripheral groove portion. The plurality of inner circumferential groove portions are provided at equal intervals on the inner circumferential surface of the pump closing cover. The plurality of inner circumferential groove portions are provided in parallel with a longitudinal axis of the pump closing cover. The plurality of inner circumferential groove portions are provided on the opening end side of the pump closing cover. The pump closing cover includes a small diameter portion between the plurality of outer peripheral groove portions.

  According to the hydraulic pressure control unit of the present invention, by providing a pressure medium flow path on the pump closing cover side, a recess processing on the housing side for securing the flow path is unnecessary, and the jig and man-hour for housing processing are reduced. However, the degree of freedom of layout that is not inferior to the conventional one can be ensured.

It is a disassembled perspective view of the conventional hydraulic control unit. It is principal part sectional drawing which shows the flow path in the hydraulic-pressure control unit of FIG. It is a principal part enlarged view which shows the opening for piston pumps of FIG. It is a notch perspective view which shows the flow of the pressure medium around the recess part of FIG. It is a front view of the pump closing cover concerning the embodiment of the present invention. It is a side view of the pump closing cover concerning the embodiment of the present invention. It is a notch perspective view which shows the flow of the pressure medium around the pump closing cover which concerns on embodiment of this invention.

Embodiments according to the hydraulic control unit of the present invention will be described below with reference to FIGS. Note that members corresponding to those shown in FIGS. 1 to 4 are denoted by the same reference numerals and description thereof is omitted.
As shown in FIGS. 5 and 6, the pump closing cover 55 according to the present embodiment has a bottomed cylindrical shape, and a plurality of inner circumferential groove portions 55 a and a plurality of outer circumferential groove portions 55 b are alternately formed. The inner peripheral groove portions 55 a are elongated grooves, and six are formed on the inner peripheral surface of the pump closing cover 55 at equal intervals. The outer peripheral groove portions 55 b are elongated grooves, and six are formed on the outer peripheral surface of the pump closing cover 55 at equal intervals.

  In the present embodiment, the number of the inner peripheral groove portions 55a and the outer peripheral groove portions 55b is six. However, since the positioning step in the circumferential direction of the pump closing cover 55 is not required when the unit is assembled, the number Is not limited to six as long as an appropriate flow rate can be secured. Further, the inner circumferential groove portion 55a and the outer circumferential groove portion 55b are parallel to each other with respect to the central axis (longitudinal axis) A of the pump closing cover 55, but may be formed to be helically bent with respect to the central axis A. .

  Furthermore, as shown in FIG. 6, the pump closing cover 55 is provided with a small diameter portion 55c at a portion where the outer peripheral groove portion 55b of the outer peripheral surface on the opening end portion 55d side is not formed. When the pump closing cover 55 is attached to the opening 31f, the surface of the small diameter portion 55c is not in contact with the inner surface of the opening 31f, and the other outer peripheral surface of the pump closing cover 55 is fixed in contact with the opening 31f. The

  During operation of the hydraulic control unit, the pressure medium flows out from the discharge valve 70 to the inner surface of the pump closing cover 55. As shown by arrows in FIG. 7, the pressure medium flows between the inner peripheral groove portion 55 a and the piston housing member 53 and flows to the opening end portion 55 d of the pump closing cover 55. Further, the pressure medium passes through a space between the outer peripheral groove portion 55 b and the piston pump housing opening 31 from the opening end portion 55 d of the pump closing cover 55, and the downstream-side flow path 11 b formed in the housing 30. Flowing into.

31f Piston pump accommodation opening 55 Pump closing cover 55a Inner peripheral groove 55b Outer peripheral groove 55c Small diameter part 55d Open end

Claims (9)

An opening formed in the housing, a piston pump accommodated in the opening and pumping the pressure medium, a pump closing cover for sealing the piston pump to the housing and guiding the pressure medium, and a pump closing cover A fluid pressure control unit having a flow path formed in the housing to receive the flowing pressure medium;
The fluid pressure control unit, wherein the pump closing cover includes a plurality of outer peripheral groove portions for flowing the pressure medium from the inside to the flow path. The hydraulic control unit according to claim 1,
The hydraulic control unit, wherein the plurality of outer peripheral groove portions are provided at equal intervals on an outer peripheral surface of the pump closing cover. The hydraulic control unit according to claim 1,
The hydraulic control unit, wherein the plurality of outer peripheral groove portions are provided in parallel with a longitudinal axis of the pump closing cover. The hydraulic control unit according to claim 1,
The hydraulic control unit, wherein the plurality of outer peripheral groove portions are provided on an opening end side of the pump closing cover. The hydraulic control unit according to claim 1,
The hydraulic pressure control unit, wherein the pump closing cover includes a plurality of inner peripheral groove portions for flowing the pressure medium from the discharge valve to the outer peripheral groove portion. In the hydraulic control unit according to claim 5,
The hydraulic control unit, wherein the plurality of inner circumferential groove portions are provided at equal intervals on an inner circumferential surface of the pump closing cover. In the hydraulic control unit according to claim 5,
The hydraulic control unit, wherein the plurality of inner peripheral groove portions are provided in parallel with a longitudinal axis of the pump closing cover. In the hydraulic control unit according to claim 5,
The hydraulic control unit, wherein the plurality of inner peripheral groove portions are provided on an opening end side of the pump closing cover. The hydraulic control unit according to claim 1,
The hydraulic control unit, wherein the pump closing cover includes a small-diameter portion between the plurality of outer peripheral groove portions.

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