JP2009234399A - Brake liquid pressure control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper structure with a simple configuration without an increase in the number of components capable of downsizing or eliminating an exclusive damper in a brake liquid pressure control device for a vehicle equipped with a damper function. <P>SOLUTION: The brake liquid pressure control device for the vehicle includes: a substrate (10) in which a flow path (A) and a storage hole (14) of the brake liquid are formed; an electric motor (20) mounted on one side surface (102) of the substrate (10); a pump (4) for returning the brake liquid upward by reciprocating a plunger (41); and a cover body (46) which is mounted in the storage hole, and water-tightly seals the opening part, and further comprises a fastening damper structure (80) for preventing the cover body (46) from falling. The fastening damper structure (80) is engaged with the substrate (10a) near the opening part, and elastically energizes the cover body (46) from the opening side to a bottom side of the storage hole. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle brake hydraulic pressure control device for controlling a brake hydraulic pressure applied to a wheel brake.

  A vehicle brake fluid pressure control device for controlling the brake fluid pressure applied to the wheel brake is mounted on the vehicle. This vehicle brake fluid pressure control device is a normally open inlet valve that allows the brake fluid pressure to be transmitted to the wheel brake when the brake pedal is depressed, or is opened when the wheel is about to lock. The normally closed outlet valve that releases the brake fluid pressure applied to the wheel brake, the reservoir that absorbs the brake fluid pressure released by opening the outlet valve, and the brake fluid pressure that has been weakened by the reservoir are set to appropriate pressure. And a pump for returning it to the upstream side of the inlet valve.

  As the above-described pump, for example, a compact plunger pump is adopted. The plunger pump reciprocates the plunger with an electric motor to set the brake fluid pressure to an appropriate pressure, and then returns the brake fluid upstream. Therefore, the brake fluid returning to the upstream side of the inlet valve again through the pump pulsates, and this pulsation may impair the operation feeling. For this reason, a dedicated damper is arranged downstream of the pump to suppress pump pulsation.

Further, by adding a configuration of an elastic member to this dedicated damper, or by using a damper plug (lid portion) as an elastic member, improvements have been made to widen the operating range of the damper and improve the damping function. (For example, Patent Documents 1 and 2).
JP 2000-177565 A Japanese Patent Laid-Open No. 9-109857

  However, providing a dedicated damper according to the capacity of the vehicle brake fluid pressure control device can suppress pulsation caused by a pump and a control valve, but the structure becomes complicated, the number of parts increases, and vehicle brake fluid pressure control. An increase in the size of the device itself could not be avoided, resulting in an increase in cost.

  Therefore, the present invention provides a vehicle brake fluid control device having a damper function, and can provide a damper structure with a simple configuration that can reduce the size or reduce the number of dedicated dampers without increasing the number of components. The main purpose.

  In order to solve the above-described problems, a brake fluid pressure control device for a vehicle according to the present invention includes a base body in which a brake fluid flow path and a receiving hole are formed, an electric motor attached to one side surface of the base body, and the housing A pump that returns the brake fluid to the upstream side by reciprocating the plunger with an eccentric shaft portion that is accommodated in the hole and is eccentric to the output shaft of the electric motor, and is attached to the opening of the accommodation hole. And a lid that liquid-tightly seals the opening, and controls the brake fluid pressure discharged from the master cylinder in response to depression of the brake pedal and transmits the brake fluid pressure to the wheel brake. An engagement damper structure having a damper function for absorbing pulsation by elastically deforming in the axial direction while preventing the lid from falling off is provided. Engaging the base of the vicinity of the opening, it is characterized by biasing the lid to elastically from an opening side of the accommodation hole to the bottom side.

According to such a configuration, after the pump is accommodated in the accommodation hole of the base body, the lid that is inserted into the opening of the same accommodation hole is prevented from falling off by the engaging damper structure provided in the opening of the accommodation hole. However, it is elastically biased from the opening side to the bottom side and can slide only in the insertion direction. And when the pulsation of the brake fluid pressure resulting from the pump is transmitted to the lid, the lid elastically slides back and forth in the insertion direction and absorbs the pulsation. In this way, the engagement damper structure can achieve the damper function by resiliently urging the lid body, so that a dedicated damper can be omitted depending on the ability of the vehicle brake hydraulic pressure control device, Can be
And while maintaining a liquid-tight state, the engaging damper structure elastically biases the lid of the opening of the accommodation hole of the plunger housing, and directly and effectively suppresses the pulsation of the plunger pump. can do.

  Further, in addition to the above configuration, it is preferable that an engagement groove is formed along the inner circumferential direction in the hole wall of the accommodation hole, and an outer peripheral portion of the engagement damper structure is accommodated in the engagement groove.

  According to such a configuration, the engagement damper structure can be easily and reliably assembled by providing the engagement groove, and this can lead to improvement in productivity and improvement in production reliability.

  Further, in addition to the above configuration, the engaging damper structure may be a plate-shaped leaf spring.

  According to such a configuration, a plate-shaped leaf spring can be used as the elastic body of the engagement damper structure, and can be easily assembled to realize a reliable operation.

  According to such a structure of the vehicle brake fluid pressure control device, the vehicle brake fluid control device has a damper function, and it is possible to reduce the size of the dedicated damper or reduce the number of components. It is possible to provide a damper structure with no simple configuration.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a brake fluid pressure circuit diagram of the vehicle brake fluid pressure control device according to the present embodiment.

  With reference to the brake fluid pressure circuit diagram of FIG. 1, functions of various components provided in the vehicle brake fluid pressure control device 100 will be briefly described. In FIG. 1, a solid line connecting various components in the vehicle brake hydraulic pressure control device 100 indicates a flow path (oil passage) formed in the device.

  As shown in FIG. 1, a vehicular brake fluid pressure control device 100 includes a master cylinder M that generates brake fluid pressure in accordance with a pedaling force applied to a brake pedal P by a driver, wheel brakes FL, FR, RL, and RR. It is arranged between. The two output ports M1, M2 of the master cylinder M are connected to the inlet port 121 of the vehicle brake hydraulic pressure control device 100, and the outlet port 122 of the vehicle brake hydraulic pressure control device 100 is connected to each wheel brake FL, FR, It is connected to RL and RR. In normal times, an oil passage is formed from the inlet port 121 to the outlet port 122 in the vehicle brake fluid pressure control device 100 so that the pedaling force of the brake pedal P is applied to each wheel brake FL, FR, RL, It is transmitted to RR.

  Here, the oil passage A starting from the output port M1 of the master cylinder M leads to the wheel brake FL on the left side of the front wheel and the wheel brake RR on the right side of the rear wheel, and the oil passage A starting from the output port M2 is a wheel on the right side of the front wheel. It communicates with the brake FR and the wheel brake RL on the left side of the rear wheel. Hereinafter, the oil passage starting from the output port M1 is referred to as “first system”, and the oil passage starting from the output port M2 is referred to as “second system”.

  The vehicle brake hydraulic pressure control device 100 is provided with two control valve means V corresponding to each wheel brake FL, RR in the first system, and similarly, each wheel brake RL in the second system. , FR, two control valve means V are provided. Further, the vehicle brake hydraulic pressure control device 100 is provided with a reservoir 3, a pump 4, a damper 5, and an orifice 5a in each of the first system and the second system. 4 and a common electric motor 20 for driving the pump 4 of the second system.

  The control valve means V opens the oil passage A for opening back to the reservoir 3 while opening the wheel hydraulic oil passage of the oil passage A extending from the output ports M1, M2 to the wheel brakes FL, RR, RL, FR. Switching between a pressure-increasing state that shuts off the oil passage, a pressure-reducing state that opens the open oil passage while shutting off the wheel hydraulic fluid passage, and a holding state that shuts off the open oil passage while shutting off the wheel hydraulic fluid passage. It has a function and comprises an inlet valve 1, an outlet valve 2, and a check valve 1a.

  The inlet valve 1 is a normally open electromagnetic valve provided in the wheel hydraulic fluid passage. The inlet valve 1 is normally open, thereby allowing brake fluid pressure to be transmitted from the master cylinder M to the wheel brakes FL, FR, RL, RR. Further, the inlet valve 1 is blocked by a control device (not shown) when the wheel is about to be locked, so that the brake hydraulic pressure transmitted from the brake pedal P to each wheel brake FL, FR, RL, RR is cut off. .

  The outlet valve 2 is a normally closed electromagnetic valve interposed between the wheel hydraulic oil passage and the open oil passage. Although the outlet valve 2 is normally closed, it is released by a control device (not shown) when the wheel is about to be locked, so that the brake fluid pressure acting on each wheel brake FL, FR, RL, RR is reduced. Relief to each reservoir 3

  The check valve 1a is connected to each inlet valve 1 in parallel. The check valve 1a is a valve that allows only the brake fluid to flow from the wheel brakes FL, FR, RL, RR to the master cylinder M, and when the input from the brake pedal P is released, Even when the valve 1 is closed, the brake fluid is allowed to flow from each wheel brake FL, FR, RL, RR side to the master cylinder M side.

The reservoir 3 is provided in an open path, and has a function of absorbing brake fluid pressure that is released when each outlet valve 2 is opened.
The pump 4 has a function of sucking the brake fluid absorbed in the reservoir 3 and returning the brake fluid to the master cylinder M via the damper 5 and the orifice 5a. As a result, the pressure state of each of the output hydraulic pressure paths A, A that has been reduced by the absorption of the brake fluid by the reservoir 3 is recovered.

  The damper 5 and the orifice 5a attenuate the pulsation of the pressure of the brake fluid discharged from the pump 4 by the cooperative action. The configuration of the damper 5 will be described later.

  Next, the appearance of main components will be described with reference to the drawings. FIG. 2 is a simplified side view showing only main components of the vehicle brake hydraulic pressure control apparatus according to the present embodiment.

  As shown in FIG. 2, the vehicle brake hydraulic pressure control device 100 is integrally fixed to a base body 10 on which various members and devices are provided and a first mounting surface (surface) 101 of the base body 10. (Not shown) and the like are housed in a housing 30 (control housing) and a second mounting surface (back surface or one side surface) 102 of the base body 10 and are integrally fixed to serve as power for a pump (not shown) for sending brake fluid. And an electric motor 20.

  The housing 30 includes a control case 30A including a support plate portion in which a connection terminal with an electronic control unit or the like is embedded, and a control cover 30B that seals an opening on the electronic control unit side of the control case 30A. It is attached to the first attachment surface 101 of the base 10 via a seal member.

  The electric motor 20 includes a motor case 21, a motor flange 22, and a rotor (not shown) inside. The motor case 21 is a member formed in a substantially bottomed cylindrical shape, and the rotor is accommodated in the motor casing 22 by covering the opening of the motor flange 22. Further, the output shaft of the rotor is rotatably supported by a ball bearing (not shown) provided in the motor case 21 or on the second mounting surface 102 side of the base 10. An eccentric shaft portion is provided at an appropriate position of the output shaft, and a ball bearing (appropriately pressing the plunger on the outer peripheral surface thereof in order to reciprocate a plunger (not shown) of the pump. (Not shown) is provided.

  The base body 10 is a metal part formed in a substantially rectangular parallelepiped shape. Holes (holes) for installing various devices such as electromagnetic valves are appropriately formed on each surface of the base body 10, and a passage for brake fluid is formed inside the base body 10. An oil passage (not shown) is appropriately formed.

  Next, an embodiment will be described with reference to the drawings. FIG. 3 is a front view as viewed from the X direction of FIG. 2, and shows a pump and a dedicated damper, partly in a sectional view. FIG. 4 is an enlarged view of the pump B surrounded by a one-dot chain line in FIG. 3, FIG. 5 is an embodiment of an engaging damper structure described later, and FIG. 6 is a modified example of the engaging damper structure.

  As shown in FIG. 3, the pump 4 and the damper 5 are attached to the accommodation holes of the base body 10 formed in a direction parallel to the first attachment surface 101 or the second attachment surface 102. As will be described later, after both are accommodated in the accommodation hole, the opening of the accommodation hole is liquid-tightly sealed by the lid.

As shown in FIG. 4, the pump 4 includes a plunger housing 42 having a stepped hole 42 </ b> H in the center, a return spring 43 that is inserted into the stepped hole 42 </ b> H and contacts the step 42 </ b> S, and a stepped state after the return spring 43 is inserted. The plunger 41 is inserted into the hole 42H, abuts on the return spring 43, and is urged by the return spring 43 in the opening direction on the insertion side. Then, after the above-described configuration of the pump 4 is accommodated in the accommodation hole 14 formed in the base body 10, a lid body 46 that seals the opening of the accommodation hole 14 in a liquid-tight manner is attached. An O-ring 48 or the like that maintains a dense state is provided around the lid 46.
The pump 4 includes a suction valve 44 that sucks in brake fluid from the reservoir 3 (see FIG. 1) and a discharge valve 45 that returns the brake fluid upstream.

  The tip 41T of the plunger 41 is urged by a return spring 43 and is in contact with the outer peripheral surface of an eccentric shaft portion 23 provided on an output shaft (not shown) of the electric motor 20. The eccentric shaft portion 23 is a thick disk-shaped member, which is coupled to the output shaft of the electric motor 20 at a position deviated from the center of the disk by a predetermined distance. It is what is generated.

  The eccentric motion by the eccentric shaft portion 23 is transmitted to the tip 41T in contact with the outer peripheral surface of the eccentric shaft portion 23, and the plunger 41 performs a reciprocating motion in the direction of the double arrow RC. By this reciprocating motion, the brake fluid sucked into the pump 4 from the suction valve 44 is increased in pressure, discharged from the discharge valve 45, and flows out to the upstream side of the pump 4. Thus, the brake fluid flowing out from the pump 4 is pulsated due to the reciprocating motion of the plunger 41.

  The lid body 46 has a bottomed cylindrical shape, and includes a bowl-shaped large-diameter portion 46L on the opening side and a small-diameter portion 46S on the bottom side. A groove of an O-ring 48 is formed on the outer periphery of the large-diameter portion 46L. After the O-ring 48 is mounted, the O-ring 48 is fitted into the receiving hole 14. The O-ring 48 keeps the base 10 in a liquid-tight state by contacting the inner wall of the accommodation hole 14 with an appropriate crushing allowance.

An engagement groove 10a is formed in a convex shape (a bowl shape) from the inner periphery of the hole in the vicinity of the opening of the storage hole 14 where the step 47 faces in the state of being mounted in the storage hole 14.
The lid body 46 is prevented from falling out of the accommodation hole 14 by the engagement damper structure 80 disposed in the vicinity of the opening of the accommodation hole 14.

The engagement damper structure 80 is a plate-shaped leaf spring shown in FIG. 5, (a) is a perspective view, (c) is a cross-sectional view, and (b) is a front view as viewed from the X arrow of (c). (D) is the rear view seen from the arrow Y of (c). The lid body 46 is inserted into the receiving hole 14 with the engagement damper structure 80 fitted to the small diameter portion 46S.
In addition, the engagement groove 10a along the inner peripheral direction is recessed in the hole wall of the accommodation hole 14, and the engagement damper structure 80 is disposed so as to be sandwiched between the stepped portion 47 and the engagement groove 10a. In other words, the outer peripheral portion of the engaging damper structure 80 is accommodated in the engaging groove 10a.
The engaging damper structure 80 is formed in the shape of a petal in a plan view in which slits are provided on the outer diameter side at appropriate intervals. When the lid body 46 is inserted, the petal portion is inclined toward the inner diameter side. It fits into the engaging groove 10a beyond the convex part of the groove 10a.

The engaging damper structure 80 inserted between the stepped portion 47 and the engaging groove 10a in this way prevents the cover body 46 from falling off and elastically moves the cover body 46 to the back side of the accommodation hole 14. Is energized. The engagement damper structure 80 elastically urges the lid 46 to hydraulically pulsate the hydraulic pressure generated by the pump 4, and the plate-shaped leaf spring of the engagement damper structure 80 elastically deforms in the direction of the arrow RC. Can be absorbed.
That is, the damper 5 according to the present embodiment is configured by the cooperation of the engaging damper structure 80, the lid body 46 that is engaged via the engaging damper structure 80, and the engaging groove 10 a of the base body 10. The dedicated damper can be omitted.

Note that the engagement damper structure is not limited to the shape of the plate-shaped leaf spring shown in FIG. 5. For example, as shown in FIG. 6, the engagement damper is a plate-like leaf spring with a simplified cross-sectional shape. The landing damper structure 81 can also be applied as a modification. Here, also in FIG. 6, as in FIG. 5, (a) is a perspective view, (c) is a cross-sectional view, (b) is a front view seen from the arrow X of (c), and (d) is It is the rear view seen from Y arrow of (c).
The engagement damper structure 81 has one less portion to bend the plate than the engagement damper structure 80, and is easy to process.

In addition to the above-described damper 5, a dedicated damper may be provided separately. However, even if a dedicated damper is provided by the electromagnetic valve engaging damper structure 80 having the damper function according to the present embodiment, The size can be reduced as compared with a conventional dedicated damper.
As described above, the embodiments have been described with reference to examples. However, the present invention is not limited to those described in the drawings, and design changes can be made without departing from the scope of the invention.

It is a brake fluid pressure circuit diagram of the brake fluid pressure control device for vehicles concerning this embodiment. It is the simplified side view which shows only the main components of the brake fluid pressure control apparatus for vehicles which concerns on this embodiment. It is the front view seen from the X direction of Drawing 2, and shows a pump and a damper as a partial sectional view. It is an enlarged view of the pump of B enclosed with the dashed-dotted line of FIG. It is one Example of a latching damper structure. It is a modification of an engagement damper structure.

Explanation of symbols

1 Inlet valve 1a Check valve 2 Outlet valve 3 Reservoir 4 Pump 5 Damper (dedicated)
5a Orifice 10 Base 10a Engaging groove 20 Electric motor 21 Motor case 22 Motor flange 30 Housing 30A Control case 30B Control cover 41 Plunger 41T Tip 42 Plunger housing 42H Stepped hole 42S Stage 43 Return spring 44 Suction valve 45 Discharge valve 46 Lid 47 Stepped 48 O-ring 80, 81 Engaging damper structure 100 Brake hydraulic pressure control device for vehicle 101 First mounting surface 102 Second mounting surface 121 Inlet port 122 Outlet port A Oil passage FL, FR, RL, RR Wheel brake M Master cylinder M1, M2 Output port P Brake pedal V Control valve means

Claims (3)

A base body with a brake fluid passage and a receiving hole formed therein;
An electric motor attached to one side of the substrate;
A pump that returns the brake fluid to the upstream side by reciprocating the plunger with an eccentric shaft portion that is accommodated in the accommodation hole and is eccentric to the output shaft of the electric motor;
A lid that is attached to the opening of the accommodation hole and seals the opening in a liquid-tight manner,
A brake fluid pressure control device for a vehicle that controls a brake fluid pressure discharged from a master cylinder in response to depression of a brake pedal and transmits the brake fluid pressure to a wheel brake,
An engagement damper structure having a damper function for absorbing pulsation by elastically deforming in the axial direction while preventing the lid from falling off is provided,
The engagement damper structure engages with the base body in the vicinity of the opening, and elastically biases the lid body from the opening side to the bottom side of the accommodation hole. Control device. An engagement groove along the inner circumferential direction is formed in the hole wall of the accommodation hole,
The brake hydraulic pressure control device for a vehicle according to claim 1, wherein an outer peripheral portion of the engagement damper structure is accommodated in the engagement groove.   The brake hydraulic pressure control device for a vehicle according to claim 1 or 2, wherein the engagement damper structure is a plate-shaped leaf spring.

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