JP3724965B2 - Hydraulic pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a hydraulic pump used in a brake hydraulic pressure control device for a vehicle, in particular, a pump housing that is inserted and fixed from an axially outer side into a mounting hole provided in the housing, and is slidable in the pump housing A plunger that is fitted to the pump housing, a plug that closes the outer end of the mounting hole so as to form a discharge chamber between the pump housing, and a communication between the pump chamber and the discharge chamber formed between the pump housing and the plunger. The present invention relates to a hydraulic pump comprising a discharge valve for switching shutoff, a suction chamber formed between an inner surface of a mounting hole and an outer surface of a pump housing, and a suction valve for switching communication / shutoff between the pump chambers.
[0002]
[Prior art]
  Conventionally, such hydraulic pumps are already known from, for example, Japanese Patent Application Laid-Open Nos. 7-291111 and 10-47256.
[0003]
[Problems to be solved by the invention]
  In the hydraulic pump disclosed in Japanese Unexamined Patent Publication No. 7-291111, the pump housing is press-fitted into the mounting hole of the housing. For this reason, when assembling the hydraulic pump to the housing, a jig for press-fitting must be prepared, so that the assembling work is complicated. Since it is necessary to press-fit, skill is required, and the accuracy is required even in automatic assembly. Moreover, in order to apply the jig to the pump housing, a contact surface having a certain area or more must be secured on the pump housing, so that the pump housing, that is, the hydraulic pump must be increased in diameter. Furthermore, once the pump housing is assembled to the housing, the pump housing cannot be removed from the housing, so it is not only impossible to reattach when an assembly error occurs, but the pump housing can be removed during maintenance, It is also impossible to disassemble and reuse the hydraulic pump.
[0004]
  On the other hand, in the hydraulic pump disclosed in the above Japanese Patent Laid-Open No. 10-47256, the pump housing is screwed into the mounting hole, and the retaining hole prevents the detachment from the mounting hole. Since the spring is provided between the plug fitted to the pump and the pump housing, the pump housing can be assembled without being a skilled worker, and the pump housing can be prevented from increasing in diameter, Although the pump housing can be removed, a tool for screwing the pump housing is required. Moreover, since the pump housing is screwed into the mounting hole from the outside in the axial direction, the pump housing is mounted on the outer surface of the pump housing to seal the annular suction chamber formed between the outer surface of the pump housing and the inner surface of the mounting hole. A twisting force is applied to the annular sealing member, and the sealing by the sealing member may be incomplete.
[0005]
  The present invention has been made in view of such circumstances. The pump housing can be reduced in size, and can be easily assembled and removed from the housing of the pump housing. It is an object of the present invention to provide a hydraulic pump that can reliably perform the sealing.
[0006]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention has an inner surface of a mounting hole provided in a housing and a cylindrical shape having an end wall at one end, and is inserted and fixed to the mounting hole from the axially outer side. An annular suction chamber is formed between the outer surface of the pump housing andThatA pump chamber is formed between one end of the plunger slidably fitted to the pump housing and the end wall, and formed between a plug for closing the axial outer end of the mounting hole and the end wall of the pump housing. Communication / blocking between the discharge chamber and the pump chamberSaidA discharge valve that switches according to the increase / decrease of the pump chamber is provided at one end of the pump housing, and a suction valve that switches communication / blockage between the suction chamber and the pump chamber according to a decrease / increase in pressure of the pump chamber. An actuator provided at one end of the plunger;Attached to the eccentric shaft provided on the output shaftA drive member protrudes from the other end of the pump housingSaidInterlocked and connected to the other end of the plungerA pair of annular sealing members for sealing both ends of the suction chamber along the axis of the mounting hole are mounted on the outer surface of the pump housing.In the hydraulic pumpOn the outer periphery of the other end of the pump housing, an annular step is formed that is recessed radially inward from the outer peripheral surface of the seal member near the other end of the pump housing and opened to the other end of the pump housing. And engaging the annular stepped portionA stopper that regulates the moving end of the pump housingOn the inner surface of the mounting holeProvided between the one end of the pump housing and a plug that is liquid-tightly and removably fitted to the outer end of the mounting hole.TheyA spring that exerts a spring force in a direction that separates the plug and the pump housing from each other is provided, and an inner surface of the outer end portion of the mounting hole is engaged with the plug from the axially outer side, thereby mounting the plug. Removable retaining ring is installed to prevent detachment from theThe outer peripheral surface of one bearing that rotatably supports the output shaft on the housing is closer to the seal member than the other end surface of the pump housing, and the end surface on the drive member side of the bearing is the outer periphery of the seal member Located closer to the plunger than the surfaceIt is characterized by that.
[0007]
  According to this configuration, the pump housing is pressed against the stopper and substantially fixed to the housing by the spring force exerted between the pump housing and the plug, and the plug is pressed against the retaining ring and substantially fixed to the housing. It will be fixed to. When assembling the hydraulic pump to the housing, insert the pump housing, spring and plug into the mounting hole in this order from the outside in the axial direction, and finally attach the retaining ring to the inner surface of the outer end of the mounting hole. If the retaining ring is removed, the plug, spring and pump housing can be detached from the mounting hole, and the hydraulic pump housing can be easily assembled and removed. In addition, since the pump housing only needs to be inserted into the mounting hole from the axially outer side, it is possible to avoid applying excessive force to the pair of seal members mounted on the outer surface of the pump housing and Can be reliably sealed with both the sealing members, and the pump housing, that is, the hydraulic pump can be downsized as compared with the case where the pump housing is press-fitted.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.
  1 to 8 show one embodiment of the present invention, FIG. 1 is a brake hydraulic circuit diagram of a brake device for a passenger vehicle, FIG. 2 is a side view of the brake hydraulic pressure control device, and FIG. 4 is a sectional view taken along the line 5-5 in FIG. 4, FIG. 6 is a sectional view taken along the line 6-6 in FIG. 4, and FIG. 7 is a sectional view taken along the line 7 in FIG. FIG. 8 is a sectional view taken along line -7, and FIG.
[0009]
  First, in FIG. 1, a tandem master cylinder M includes first and second output ports 1 that generate brake fluid pressure in accordance with a pedaling force applied to a brake pedal P by a vehicle driver.₁, 1₂With left front wheel brake B₁, Right rear wheel brake B₂, Right front wheel brake B_ThreeAnd left rear wheel brake B_FourAnd the first and second output ports 1₁, 1₂First and second output hydraulic pressure paths 2 individually connected to each other₁, 2₂The brake fluid pressure control device 3 is provided between the brake fluid pressure control device 3 and the right and left rear wheel brake B.₂, B_FourIn between, the first and second proportional pressure reducing valves 4₁, 4₂Are interposed.
[0010]
  Brake fluid pressure control device 3 is a front left wheel brake B₁, Right rear wheel brake B₂, Right front wheel brake B_ThreeAnd left rear wheel brake B_FourThe first, second, third and fourth normally open solenoid valves 5 individually corresponding to₁~ 5_FourAnd each normally open solenoid valve 5₁~ 5_FourFirst, second, third and fourth check valves 7 connected in parallel to each other₁~ 7_FourAnd each wheel brake B₁~ B_Four1st, 2nd, 3rd and 4th normally closed solenoid valves 6 corresponding individually to₁~ 6_FourAnd first and second output hydraulic pressure paths 2₁, 2₂First and second reservoirs 8 individually corresponding to each₁, 8₂And the first and second reservoirs 8₁, 8₂Intake valve 10₁, 10₂Plunger-type first and second hydraulic pumps 11 connected to each other₁, 11₂And both hydraulic pumps 11₁, 11₂Electric motor 12 as one common actuator for driving the first and second hydraulic pumps 11₁, 11₂Discharge valve 13₁, 13₂First and second dampers 14 connected via₁, 14₂And the first and second output hydraulic pressure paths 2₁, 2₂And the first and second dampers 14₁, 14₂The first and second orifices 15 respectively interposed between the first and second orifices 15₁, 15₂And each normally open solenoid valve 5₁~ 5_FourEach normally closed solenoid valve 6₁~ 6_FourAnd an electronic control unit 16 that controls the operation of the electric motor 12.
[0011]
  First normally open solenoid valve 5₁Is the first output hydraulic pressure path 2₁And front left wheel brake B₁The second normally open solenoid valve 5 provided between₂Is the first output hydraulic pressure path 2₁And the first proportional pressure reducing valve 4₁3rd normally open type solenoid valve 5 provided between_ThreeIs the second output hydraulic path 2₂And right front wheel brake B_Three4th normally open type solenoid valve 5 provided between_FourIs the second output hydraulic path 2₂And the second proportional pressure reducing valve 4₂Between.
[0012]
  The first to fourth check valves 7₁~ 7_FourIs the corresponding wheel brake B₁~ B_FourEach normally open solenoid valve 5 so as to allow the flow of brake fluid from the engine to the master cylinder M.₁~ 5_FourConnected in parallel.
[0013]
  First normally closed solenoid valve 6₁Is the front left wheel brake B₁And the first reservoir 8₁The second normally closed solenoid valve 6 provided in between₂Is the first proportional pressure reducing valve 4₁And the first reservoir 8₁A third normally closed solenoid valve 6 provided in between_ThreeIs the right front wheel brake B_ThreeAnd the second reservoir 8₂A fourth normally closed solenoid valve 6 provided in between_FourIs the second proportional pressure reducing valve 4₂And the second reservoir 8₂Between.
[0014]
  By the way, the first normally open solenoid valve 5₁And the first normally closed solenoid valve 6₁Cooperate with the first control valve means V₁The second normally open solenoid valve 5₂And the second normally closed solenoid valve 6₂Cooperate with the second control valve means V₂And a third normally open solenoid valve 5_ThreeAnd the third normally closed solenoid valve 6_ThreeCooperates with the third control valve means V_ThreeAnd a fourth normally open solenoid valve 5_FourAnd the fourth normally closed solenoid valve 6_FourCooperates with the fourth control valve means V_FourConfigure.
[0015]
  Such control valve means V₁~ V_FourThe electronic control unit 16 controls the master cylinder M and the wheel brake B during normal braking where each wheel is not likely to lock.₁~ B_FourWheel brake B₁~ B_FourAnd reservoir 8₁, 8₂It is controlled so as to cut off the gap. That is, each normally open solenoid valve 5₁~ 5_FourIs demagnetized and opened, and each normally closed solenoid valve 6₁~ 6_FourIs demagnetized and closed, and the first output port 1 of the master cylinder M₁The brake hydraulic pressure output from the first normally open solenoid valve 5₁Through left front wheel brake B₁And the second normally open solenoid valve 5₂And the first proportional pressure reducing valve 4₁Via right rear wheel brake B₂Act on. The second output port 1 of the master cylinder M₂The brake fluid pressure output from the third normally open solenoid valve 5_ThreeThrough right front wheel brake B_ThreeAnd the fourth normally open solenoid valve 5_FourAnd the second proportional pressure reducing valve 4₂Through left rear wheel brake B_FourAct on.
[0016]
  When the wheel is about to enter the locked state during braking, each control valve means V₁~ V_FourThe control valve means corresponding to the wheel that is about to enter the locked state is controlled by the electronic control unit 16 by the master cylinder M and the wheel brake B.₁~ B_FourWheel brake B₁~ B_FourAnd reservoir 8₁, 8₂It is controlled to communicate with each other. That is, the first to fourth normally open solenoid valves 5₁~ 5_FourThe normally open solenoid valve corresponding to the wheel that is about to enter the locked state is excited and closed, and the first to fourth normally closed solenoid valves 6 are closed.₁~ 6_FourOf these, the normally closed solenoid valve corresponding to the wheel is excited and opened. As a result, a part of the brake fluid pressure of the wheel that is about to enter the locked state is transferred to the first reservoir 8.₁Or the second reservoir 8₂The brake fluid pressure of the wheel that has been absorbed by the vehicle and is about to enter the locked state is reduced.
[0017]
  When the brake fluid pressure is kept constant, each control valve means V₁~ V_FourThe wheel brake B is controlled by the electronic control unit 16.₁~ B_FourMaster cylinder M and reservoir 8₁, 8₂It is controlled to be in a state of being cut off from. That is, the normally open solenoid valve 5₁~ 5_FourIs excited and closed, and the normally closed solenoid valve 6₁~ 6_FourWill be demagnetized and closed. When the brake fluid pressure is further increased, the normally open solenoid valve 5₁~ 5_FourIs demagnetized and opened, and the normally closed solenoid valve 6₁~ 6_FourMay be demagnetized and closed.
[0018]
  Thus, each control valve means V₁~ V_FourIs controlled by the electronic control unit 16 so that braking can be efficiently performed without locking the wheels.
[0019]
  Meanwhile, the electric motor 12 is operated by the electronic control unit 16 during the antilock brake control as described above. As the electric motor 12 operates, the first and second hydraulic pumps 11₁, 11₂Is driven, the first and second reservoirs 8₁, 8₂The brake fluid absorbed by the first and second hydraulic pumps 11₁, 11₂And then the first and second dampers 14₁, 14₂The first and second orifices 15 are discharged to the side.₁, 15₂1st and 2nd output hydraulic pressure paths 2₁, 2₂To reflux. By such a recirculation of the brake fluid, the first and second reservoirs 8₁, 8₂It is possible to prevent an increase in the depression amount of the brake pedal P due to the absorption of the brake fluid. Moreover, the first and second hydraulic pumps 11₁, 11₂The pulsation of the discharge pressure of the first and second dampers 14₁, 14₂, And first and second orifices 15₁, 15₂Therefore, the operation feeling of the brake pedal P is not hindered by the reflux.
[0020]
  2 to 4, the brake hydraulic pressure control device 3 includes a housing 20 formed in a block shape by, for example, an aluminum alloy, and the first to fourth normally open electromagnetic valves 5 are provided in the housing 20.₁~ 5_FourThose normally open solenoid valves 5₁~ 5_FourAnd control valve means V₁~ V_Four1st to 4th normally closed solenoid valve 6 constituting₁~ 6_Four,, 1st to 4th check valve 7₁~ 7_Four, First and second reservoirs 8₁, 8₂, First and second dampers 14₁, 14₂, First and second orifices 15₁, 15₂And the first and second hydraulic pumps 11₁, 11₂Is provided. A synthetic resin cover 21 is attached to one surface 20 a of the housing 20, and a motor case 22 of the electric motor 12 is attached to the other surface 20 b of the housing 20 on the side opposite to the cover 21.
[0021]
  Referring to FIGS. 5 to 7 together, the first to fourth normally open solenoid valves 5₁~ 5_FourThe solenoid part 5b is connected to the valve part 5a, and each valve part 5a is formed in four mounting holes 23 provided in the upper part of the housing 20 so as to open to one surface 20a of the housing 20. Are accommodated, and each solenoid portion 5b projects from one surface 20a of the housing 20. The first to fourth normally closed solenoid valves 6₁~ 6_FourThe solenoid part 6b is connected to the valve part 6a, and each valve part 6a is formed in four mounting holes 24 provided in the upper part of the housing 20 so as to open to one surface 20a of the housing 20. Are accommodated, and each solenoid portion 6b projects from one surface 20a of the housing 20. Moreover, the mounting holes 23 are provided in the housing 20 side by side in the horizontal direction, whereas the mounting holes 24 are provided in the housing 20 side by side in the horizontal direction below the mounting holes 23. -4th normally open type solenoid valve 5₁~ 5_FourAnd the first to fourth normally closed solenoid valves 6₁~ 6_FourAre mounted on the housing 20 in parallel vertically.
[0022]
  First reservoir 8₁Control valve means V₁, V₂At a position corresponding to the second reservoir 8.₂Control valve means V_Three, V_FourIs disposed in the lower part of the housing 20 at a position corresponding to the above. Thus, both reservoirs 8₁, 8₂As shown in FIG. 5, a reservoir chamber 27 is formed between a bottomed reservoir hole 26 provided in the housing 20 so as to open on one surface 20a of the housing 20 and a closed end of the reservoir hole 26. The bottomed cylindrical piston 28 slidably fitted into the reservoir hole 26, the receiving member 29 fitted to the open end of the reservoir hole 26, and the reservoir member 26 from the reservoir hole 26. The retaining ring 30 is attached to the opening edge of the reservoir hole 26 so as to prevent the withdrawal, and the reservoir spring 31 is contracted between the receiving member 29 and the piston 28. 8₁, 8₂Reservoir chambers 27 are first and second hydraulic pumps 11.₁, 11₂Connected to.
[0023]
  First damper 14₁Control valve means V₁, V₂And the first reservoir 8₁The second damper 14 is disposed in the housing 20 at a position corresponding to the gap therebetween.₂Control valve means V_Three, V_FourAnd the second reservoir 8₂It arrange | positions in the housing 20 in the position corresponding to between.
[0024]
  Both dampers 14₁, 14₂Is slidably fitted into a bottomed damper hole 33 provided in the housing 20 so as to open to one surface 20a of the housing 20 to form a damper chamber 34 between the closed end of the damper hole 33. A piston 35, a receiving member 36 fitted to the opening end of the damper hole 33, and a stopper attached to the opening edge of the damper hole 33 so as to prevent the receiving member 36 from coming out of the damper hole 33. Each of the dampers 14 includes a ring 37 and one or a plurality of disc springs 38 provided between the receiving member 36 and the piston 35.₁, 14₂The damper chamber 34 of the first and second hydraulic pumps 11₁, 11₂Connected to.
[0025]
  The motor case 22 of the electric motor 12 includes a bottomed cylindrical case body 22a and a lid body 22b disposed so as to close the open end of the case body 22a. The case body 22a and the lid body 22b Are fastened to the other surface 20b of the housing 20 by a plurality of screw members 41. The output shaft 42 of the electric motor 12 rotatably passes through the lid body 22b and extends into a concave portion 43 provided in the housing 20, and includes a ball bearing 44 held by the lid body 22b, and a concave portion 43. It is supported by a ball bearing 45 held at the inner end of the bearing. Moreover, the output shaft 42 is provided with an eccentric shaft portion 42a at an intermediate portion located between the bearings 44 and 45, and a ball bearing 46 as a driving member is mounted on the outer periphery of the eccentric shaft portion 42a.
[0026]
  First and second hydraulic pumps 11₁, 11₂Are the first to fourth normally closed solenoid valves 6₁~ 6_FourAnd the first and second reservoirs 8₁, 8₂Between the first to fourth normally closed solenoid valves 6₁~ 6_FourAre arranged in the housing 20 with a coaxial operating axis that is perpendicular to the output shaft 42 of the electric motor 12 and along the arrangement direction of the electric motor 12.
[0027]
  In FIG. 8, the first hydraulic pump 11₁The pump housing 62 is inserted and fixed in the mounting hole 61 provided in the housing 20 from the axially outer side, the plunger 40 is slidably fitted in the pump housing 62, and the outside of the mounting hole 61. A plug 63 for closing the end; and a spring 64 provided between the pump housing 62 and the plug 63.₁And discharge valve 13₁Is the hydraulic pump 11₁Built in.
[0028]
  The housing 20 is provided with a mounting hole 61 extending in a direction perpendicular to the axis of the electric motor 12 between the outer surface of the housing 20 and the recess 43, and the mounting hole 61 extends from the outer end side to the inner end side. The first hole 61a having an outer end opened on the outer surface of the housing 20 and a second hole having a smaller diameter than the first hole 61a and the outer end coaxially connected to the inner end of the first hole 61a. A hole 61b, a third hole 61c having a smaller diameter than the second hole 61b, an outer end coaxially connected to the inner end of the second hole 61b, and a third hole having a smaller diameter than the third hole 61c. The inner end of the portion 61 c is configured by a fourth hole 61 d whose outer end is coaxially connected, and the inner end of the fourth hole 61 d is opened on the inner surface of the recess 43. Moreover, an annular stepped portion facing the axially outer side of the mounting hole 61 is formed as a stopper 65 between the third and fourth holes 61c and 61d, and this stopper 65 is axially disposed in the mounting hole 61. It fulfills the function of regulating the axially inner end of the pump housing 62 inserted from the outside.
[0029]
  The pump housing 62 is formed in a stepped cylindrical shape having an end wall 62a at one end, and is inserted into the mounting hole 61 from the axially outer side. That is, the pump housing 62 is formed in a smaller diameter than the first hole 61a of the mounting hole 61 and is disposed at a portion corresponding to the first hole 61a, and one end is continuously provided on the outer periphery of the end wall 62a. A cylindrical portion 62b and a second cylinder that has a larger diameter than the first cylindrical portion 62a, one end of which is coaxially connected to the other end of the first cylindrical portion 62b and fitted into the second hole portion 61b of the mounting hole 61 A third cylindrical portion 62d that is smaller in diameter than the second hole portion 61b of the mounting hole 61 and is coaxially connected to the other end of the second cylindrical portion 62c; and a larger diameter than the third cylindrical portion 62d. A fourth cylindrical portion 62e that is coaxially connected to the other end of the third cylindrical portion 62d and fitted in the third hole 61c of the mounting hole 61, and has a smaller diameter than the fourth cylindrical portion 62e. One end is coaxial with the other end of the fourth cylindrical portion 62e Made integrally provided with a fifth cylindrical portion 62f to be fitted in the fourth hole portion 61d of the mounting hole 61 with.
[0030]
  MoreoverThe other end of the pump housing 62, that is,In the pump housing 62, between the fourth and fifth cylindrical portions 62e, 62f, Which is recessed radially inward from the outer peripheral surface of the seal member 68 described later.Annular facing the inward side along the axis of the mounting hole 61StepsA portion 62g is formed, and the stepped portion 62g abuts on a stopper 65 formed on the inner surface of the mounting hole 61, thereby restricting the inward movement end of the pump housing 62 along the axis of the mounting hole 61. Will be.As shown in FIG. 8, the annular step 62g is adjacent to and opposed to the outer peripheral corner of one bearing 44 that rotatably supports the output shaft 42 on the housing 20, with the stopper 65 interposed therebetween. The outer peripheral surface of the bearing 44 is closer to the seal member 68 than the other end surface (the end surface on the output shaft 42 side) of the pump housing 62, and the end surface on the ball bearing 46 side of the bearing 44 is from the outer peripheral surface of the seal member 68. Are also located closer to the plunger 40.
[0031]
  In a state where the pump housing 62 is inserted into the mounting hole 61, an annular shape whose inner and outer periphery is defined by the outer surface of the third cylindrical portion 62 d of the pump housing 62 and the inner surface of the second hole portion 61 b of the mounting hole 61 is defined. A suction chamber 66 is formed between the outer surface of the pump housing 62 and the inner surface of the mounting hole 61. In order to seal both ends of the suction chamber 66 along the axial direction of the mounting hole 61, the second cylindrical portion 62 c of the pump housing 62 is formed. An annular seal member 67 that elastically contacts the inner surface of the second hole 61b is attached to the outer surface, and the outer surface of the fourth cylindrical portion 62e in the pump housing 62 is elastically applied to the inner surface of the third hole 61c. An annular seal member 68 that comes into contact with is attached. Thus, the suction chamber 66 has the first reservoir 8.₁It is communicated to.
[0032]
  The plunger 40 is formed in a bottomed cylindrical shape with one end side opened and the other end side closed, and is slidably fitted to the pump housing 62. The end wall 62a of the pump housing 62 and the plunger 40 A pump chamber 69 is formed between one end.
[0033]
  An annular chamber 70 is formed between the outer surface of the plunger 40 and the inner surface of the pump housing 62, and communicates with the suction chamber 66 through a communication hole 71 provided in the third cylindrical portion 62 d of the pump housing 62. Seal members 72 and 73 for sealing both ends of the annular chamber 70 along the axial direction are mounted on the outer surface of the plunger 40 so as to elastically slide in contact with the inner surface of the pump housing 62. In addition, the plunger 40 is provided with a plurality of communication holes 74, 74... That allow the annular chamber 70 to communicate with the plunger 40.
[0034]
  In the pump chamber 69, a coiled return spring 79 is contracted between the end wall 62 a of the pump housing 62 and one end of the plunger 40, and the plunger 40 causes the pump chamber 69 to be compressed by the spring force of the return spring 79. The other end of the plunger 40 is protruded from the other end of the pump housing 62 and is urged in a direction in which it is always in sliding contact with the outer surface of the outer ring of the ball bearing 46.
[0035]
  Suction valve 10₁Is provided at one end of the plunger 40, a valve seat 80 provided at one end opening of the plunger 40, and a spherical valve body 81 that can be seated on the valve seat 80 and is accommodated in the pump chamber 69. And a spring 82 provided between the end wall 62a of the pump housing 62 and the valve body 81 by exerting a spring force in a direction in which the valve body 81 is seated on the valve seat 80, and the spring force of the spring 82 is returned. It is set smaller than the spring force of the spring 79.
[0036]
  Discharge valve 13₁Is provided at one end of the pump housing 62, and has a discharge hole 83 provided at the center of the end wall 62 a so as to communicate with the pump chamber 69, and the end wall 62 a with the discharge hole 83 facing the center. The valve seat 86 formed on the outer surface side of the pump housing 62 and a valve housing 86 that is caulked and coupled to one end of the pump housing 62 so as to form a valve chamber 85 between the end wall 62a and the valve seat 84 can be seated. A spherical valve body 87 housed in the valve chamber 85 and a spring 88 provided between the valve housing 86 and the valve body 87 by exerting a spring force for seating the valve body 87 on the valve seat 84 are configured. .
[0037]
  The plug 63 is formed in a bottomed cylindrical shape with the outer end closed, and is fitted into the outer end portion of the mounting hole 61, that is, the first hole portion 61 a, and between the plug 63 and one end of the pump housing 62. Discharge valve 13₁Is formed. Moreover, the discharge valve 13₁The valve housing 86 is provided with a communication hole 94 that allows the valve chamber 85 to communicate with the discharge chamber 93.
[0038]
  An annular seal member 95 that seals between the discharge chamber 93 and the outside is mounted on the outer surface of the plug 63 so as to elastically contact the inner surface of the first hole 61 a in the mounting hole 61. That is, the plug 63 is fitted to the outer end portion of the mounting hole 61 in a liquid-tight manner and detachable.
[0039]
  A retaining ring 96 is detachably attached to the inner surface of the first hole 61a of the mounting hole 61 outside the plug 63, and the retaining ring 96 is engaged with the plug 63 from the outside. The plug 63 is prevented from being detached from the mounting hole 61.
[0040]
  The spring 64 exerts a spring force in a direction that separates the plug 63 and the pump housing 62 from each other and is housed in the discharge chamber 93. The pump housing 62 is pressed against the stopper 65 by the spring force of the spring 64. As a result, the plug 65 is pressed against the retaining ring 96 and substantially fixed to the housing 20.
[0041]
  The discharge chamber 93 is connected to the first damper 14.₁To the first orifice 15₁Through the first output hydraulic pressure path 2₁The housing 20 has a discharge chamber 93 in the first damper 14.₁The communication passage 97 communicating with the first orifice 15 and the discharge chamber 93 are connected to the first orifice 15.₁A communication path 98 is provided to communicate with.
[0042]
  Such a first hydraulic pump 11₁Then, when the output shaft 42 is rotated by the operation of the electric motor 12, an eccentric motion is given to the ball bearing 46 via the eccentric shaft portion 42a, whereby the plunger 40 is driven to reciprocate in the pump housing 62, and the suction The communication / blocking between the chamber 66 and the pump chamber 69 is performed according to the decrease / increase in pressure of the pump chamber 69.₁The communication between the pump chamber 69 and the discharge chamber 93 is interrupted / released according to the increase / decrease of the pump chamber 69.₁It will be switched by.
[0043]
  Second hydraulic pump 11₂The first hydraulic pump 11₁And the first hydraulic pump 11 with respect to the axis of the output shaft 42 in the electric motor 12.₁Arranged symmetrically.
[0044]
  The cover 21 includes the first to fourth normally open solenoid valves 5.₁~ 5_FourIn the first to fourth normally closed solenoid valves 6.₁~ 6_FourIn which the first and second reservoirs 8 are housed.₁, 8₂And the first and second dampers 14 in₁, 14₂Are accommodated to one surface 20a of the housing 20 by a plurality of screw members 49... Thus, an endless seal member 59 that elastically contacts the one surface 20a of the housing 20 is attached to the edge of the cover 21 on the housing 20 side.
[0045]
  The middle part in the cover 21 includes first to fourth normally open solenoid valves 5.₁~ 5_FourAnd the first to fourth normally closed solenoid valves 6.₁~ 6_FourIs provided with a support portion 50 for fitting and supporting each of the solenoid portions 6b, and a plurality of openings 52 are formed in the support portion 50 so that the storage chamber 48 is not partitioned by the support portion 50. Is done.
[0046]
  The electronic control unit 16 is configured by mounting a semiconductor chip 54 or the like on a substrate 53 on which an electric circuit is printed, and the substrate 53 is fastened to the support portion 50 on the side opposite to the housing 20 in the cover 21. . Moreover, a plurality of conductive metal bus bars 51... Are embedded in the support portion 50, and the first to fourth normally open solenoid valves 5 are formed by these bus bars 51.₁~ 5_FourAnd the first to fourth normally closed solenoid valves 6.₁~ 6_FourAre connected to the electronic control unit 16.
[0047]
  The cover 21 is integrally formed with a protruding portion 21a that protrudes laterally from the housing 20, and the protruding portion 21a is provided with a male cover-side connector 55.
[0048]
  The cover-side connector 55 includes a connector housing 56 that is formed in a box shape integrally with the protruding portion 21 a of the cover 21, and a plurality of connector terminals 57 that are housed and supported in the connector housing 56. The connector terminals 57 are connected to the solenoid parts 5b, 6b, etc. via the electronic control unit 16 and the bus bar 51, and the electric motor 12 is connected to the electronic control unit 16 and a conductor (not shown). Connected to.
[0049]
  A connector housing 77 of an external conductor-side connector 76 provided in common at the ends of the plurality of external conductors 75, 75... Is detachably connected to the cover-side connector 55 connected to the cover 21. Connector terminals (not shown) provided in the connector housing 77 in series with the 75 are respectively fitted and connected to the connector terminals 57 of the cover-side connector 55.
[0050]
  2 and 3, the body frame 88 has a support plate portion 89 a that faces the lower surface of the housing 20, and is connected to both ends of the support plate portion 89 a at right angles to face both side surfaces of the housing 20. A bracket 89 including a pair of support plate portions 89b and 89b is fixed.
[0051]
  On the other hand, mounting protrusions 102, 102 are integrally projected on both sides of the upper portion of the housing 20, and both mounting protrusions 102, 102 are mounted on the upper portions of the support plate portions 89 b, 89 b of the bracket 89. It is attached via.
[0052]
  The mounting means 91 includes a mounting bolt 103 having an axis extending substantially horizontally and supported on the support plate portion 89b, and a cylindrical mounting rubber 104 into which a part of the mounting bolt 103 is fitted. The mounting protrusion 102 is provided with a bottomed mounting hole 105 into which the mount rubber 104 is fitted.
[0053]
  The mount bolt 103 includes a screw shaft portion 103a, a fitting shaft portion 103b that is coaxially and integrally connected to the screw shaft portion 103a, and a radially outward portion from the connecting portion of the screw shaft portion 103a and the fitting shaft portion 103b. And a flange portion 103c projecting from the bottom. On the other hand, a slit 106 opened upward is provided on the upper portion of the support plate portion 89b, and a portion of the screw shaft portion 103a near the flange portion 103c is inserted into the slit 106 from above. Thus, the nut 107 is screwed onto the screw shaft portion 103a, and the support plate portion 89b is sandwiched between the nut 107 and the flange portion 103c, so that the mount bolt 103 is fixed to the support plate portion 89b. Will be supported.
[0054]
  The lower portion of the housing 20 is attached to the support plate portion 89a of the bracket 89 via the mounting means 90. The mounting means 90 has a mounting rubber (not shown) fitted to the lower portion of the housing 20. These are fixed to the support plate portion 89a.
[0055]
  Next, the operation of this embodiment will be described. First and second hydraulic pumps 11₁, 11₂The pump housing 62 is inserted into the mounting hole 61 with a pair of seal members 67 and 68 sealing both ends of the suction chamber 66 attached to the outer surface, and is liquid-tightly inserted into the outer end of the mounting hole 61. Between the plug 63 and the pump housing 62 that are detachably fitted, a spring 64 that exerts a spring force in a direction that separates the plug 63 and the pump housing 62 from each other is provided. A stopper 65 is provided that contacts the pump housing 62 and restricts the axially inwardly moving end of the pump housing 62, and the plug 63 is connected to the inner surface of the outer end of the mounting hole 61 from the axially outer side. A retaining ring 96 that is engaged and prevents the plug 63 from being detached from the mounting hole 61 is detachably mounted.
[0056]
  Accordingly, the pump housing 62 is pressed against the stopper 65 and substantially fixed to the housing 20 by the spring force exerted by the spring 64, and the plug 63 is pressed to the retaining ring 96 and substantially fixed to the housing 20. become. For this reason, the hydraulic pump 11₁, 11₂Is assembled to the housing 20, the pump housing 62, the spring 64 and the plug 63 are inserted into the mounting hole 61 from the axially outer side in this order, and finally the retaining ring 96 is attached to the inner surface of the outer end of the mounting hole 61. The plug 63, the spring 64, and the pump housing 62 can be detached from the mounting hole 61 by removing the retaining ring 96, and the hydraulic pump 11₁, 11₂Can be easily assembled and removed from the housing 20.
[0057]
  In addition, since the pump housing 62 only needs to be inserted into the mounting hole 61 from the axially outer side, it is possible to avoid applying excessive force to the pair of seal members 67 and 68 mounted on the outer surface of the pump housing 62. Thus, both ends of the suction chamber 66 can be surely sealed with both the seal members 67 and 68, and the pump housing 62, that is, the hydraulic pump 11 can be compared with the one in which the pump housing 62 is press-fitted.₁, 11₂Can be reduced in size.
[0058]
  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.
[0059]
  For example, in the above embodiment, the hydraulic pump 11 used in the vehicle brake hydraulic pressure control device.₁, 11₂The present invention has been described with reference to the case where the present invention is applied.₁, 11₂It is not limited to this, but can be widely applied as a hydraulic pump.
[0060]
【The invention's effect】
  As described above, according to the present invention, the assembly and removal of the hydraulic pump housing can be easily performed, and both ends of the suction chamber can be reliably sealed with both seal members. The pressure pump can be reduced in size.
[Brief description of the drawings]
FIG. 1 is a brake hydraulic circuit diagram of a brake device for a passenger vehicle.
FIG. 2 is a side view of the brake fluid pressure control device.
FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2;
4 is a view taken in the direction of arrow 4 in FIG. 2;
5 is a cross-sectional view taken along line 5-5 of FIG.
6 is a cross-sectional view taken along line 6-6 of FIG.
7 is a cross-sectional view taken along line 7-7 in FIG.
FIG. 8 is an enlarged cross-sectional view of a hydraulic pump.
[Explanation of symbols]
10₁, 10₂... Suction valve
11₁, 11₂... Hydraulic pump
12 ... Electric motor as actuator
13₁, 13₂... Discharge valve
20 ... Housing
40 ... Plunger
42 ... Output shaft
42a ... Eccentric shaft
44 ... Bearing
46... Ball bearing as drive member
61 ... Mounting hole
62 ... Pump housing
62a ... end wall
62g ... annular step
63 ... Plug
64 ... Spring
65 ... Stopper
66 ... Inhalation chamber
67, 68 ... Sealing member
69 ... Pump room
93 ... Discharge chamber
96 ... retaining ring

Claims (1)

An inner surface of a mounting hole (61) provided in the housing (20) and an end wall (62a) at one end are formed in a cylindrical shape, and are inserted into and fixed to the mounting hole (61) from the axially outer side. that an annular suction chamber between the outer surface of the pump housing (62) (66) is formed, one end and the end wall (62a of the plunger (40) slidably fitted in the pump housing (62) ) Between the plug (63) and the end wall (62a) of the pump housing (62) for closing the axial outer end of the mounting hole (61). discharge chamber (93), said pump chamber (69) and a discharge valve for switching in response to increasing and depressurizing of communicating and blocking said pump chamber (69) between (13 _1, 13 ₂₎ of said pump housing (62 ) At one end of the suction chamber (6) ) And the pump chamber (69) wherein the establishing and blocking fluid communication between the pump chamber intake valve for switching in response to the reduced-pressure increase (69) (10 _1, 10 ₂₎ is provided at one end of said plunger (40), eccentric shaft portion provided on the output shaft (42) of the actuator (12) driving member mounted on (42a) (46) is, at the other end of the plunger projecting from the other end of the pump housing (62) (40) A pair of annular seal members (67, 68) that are interlocked and connected to seal both ends of the suction chamber (66) along the axis of the mounting hole (61) are mounted on the outer surface of the pump housing (62). in such Rueki圧pump,
The outer periphery of the other end of the pump housing (62) is recessed radially inward from the outer peripheral surface of the seal member (68) near the other end of the pump housing (62). annular step which is open on the other end face of the) (62 g) with is formed, the stopper (65) mounted for restricting the moving end of the annular stepped portion (engaging in 62 g) in the pump housing (62) Between a plug (63) provided on the inner surface of the hole (61) and fitted to the outer end of the mounting hole (61) in a liquid-tight and detachable manner, and one end of the pump housing (62) the spring exert their plugs (63) and the spring force in the direction of separating the pump housing (62) to each other (64) is provided, the outer end inner surface of the mounting hole (61), said plug ( 63) axially outward side The plug (63) retaining ring (96) to prevent withdrawal of the mounting hole (61) of detachably attached engaged et engagement, the output shaft (42) rotatably on the housing (20) The outer peripheral surface of one bearing (44) to be supported is closer to the seal member (68) than the other end surface of the pump housing (62), and the end surface on the drive member (46) side of the bearing (44) is The hydraulic pump, wherein the hydraulic pump is located closer to the plunger (40) than the outer peripheral surface of the seal member (68) .

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