JP2005289210A - Vehicular brake hydraulic pressure control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular brake hydraulic pressure control device ensuring the operability of a reservoir piston before the reservoir piston is in a full stroke. <P>SOLUTION: The vehicular brake hydraulic pressure control device A comprises: a pump body 100 with an oil passage formed therein; a bottomed reservoir hole 113; a reservoir piston 31 slidable in the reservoir hole 113; a reservoir spring 32 to urge the reservoir piston 31 to a bottom part 113a side of the reservoir hole 113; a spring receiving member 33 to support the reservoir spring 32; and a communication hole 151 to relieve air in the spring chamber R3 outside via a chamber R1 in a control housing 10. The communication hole 151 is formed so that an opening 151a thereof faces a touch part TP of the reservoir piston 31 with the spring receiving member 33 in the full stroke. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  In general, a vehicular brake hydraulic pressure control device for controlling the brake hydraulic pressure applied to a wheel brake has a normally open type inlet valve that allows transmission of brake hydraulic pressure to the wheel brake by depressing a brake pedal, and a wheel. A normally closed outlet valve that releases the brake fluid pressure applied to the wheel brake by being released when it is about to lock, a reservoir to absorb the brake fluid pressure released by opening the outlet valve, etc. I have. As such a vehicle brake hydraulic pressure control device, there is conventionally known a device that is provided on the lower surface of a pump body (base body) for providing the inlet valve, the outlet valve and the like with the reservoir exposed to the outside. (See Patent Documents 1 and 2).

The structure in the vicinity of the reservoir disclosed in Patent Document 1 will be described below.
As shown in FIG. 13, the reservoir R is provided in a reservoir hole RH formed on the lower surface of the pump body B, and a reservoir piston RP that can slide on the inner peripheral wall of the reservoir hole RH, and the reservoir piston RP as a reservoir A reservoir spring RS that biases the bottom surface of the hole RH and a spring receiving member SC that supports the reservoir spring RS and seals the inside of the reservoir hole RH are mainly configured. In addition, an intake hole TH for taking in brake fluid pressure into the reservoir hole RH is formed on the bottom surface of the reservoir hole RH, so that the brake fluid pressure is absorbed by the reservoir spring RS via the reservoir piston RP. It has come to be. Note that the air between the reservoir piston RP and the spring receiving member SC is not shown through the communication hole EH that opens to the side surface of the reservoir hole RH (specifically, the position above the edge SC1 of the spring receiving member SC). The motor case that houses the motor is relieved, whereby the influence of air compression is alleviated, and the reservoir piston RP that is pressed by the brake fluid pressure operates smoothly.

  The structure in the vicinity of the reservoir disclosed in Patent Document 2 is a structure in which a space in the reservoir is communicated with a control housing provided on the opposite side of the motor by a communication hole. In the structure of Patent Document 2, as in the structure of Patent Document 1, the communication hole is formed to open at a position above the edge of the spring receiving member.

JP 2001-328526 A (paragraphs 0017 to 0020, FIG. 2) JP-A-11-99924 (paragraphs 0018 to 0032, FIG. 2)

  However, in the two techniques described above, the opening of the communication hole EH is located above the end edge SC1 of the spring receiving member SC, so that the end edge RP1 of the reservoir piston RP is lower than the opening of the communication hole EH. In this case, the communication hole EH is blocked by the outer peripheral surface of the reservoir piston RP. When the communication hole EH is closed in this way, when the reservoir piston RP subsequently moves downward (until the reservoir piston RP is fully stroked), the reservoir piston RP becomes a spring with the reservoir piston RP. There is a problem that the operability of the reservoir piston RP is impaired due to the influence of the compression of the air confined between the receiving member SC.

  Therefore, an object of the present invention is to provide a vehicle brake hydraulic pressure control device that can ensure the operability of the reservoir piston until the reservoir piston is fully stroked.

  The invention according to claim 1 of the present invention that solves the above-described problem is that a pump body in which an oil passage serving as a passage for brake fluid is formed, and brake fluid that is formed in the pump body and passes through the oil passage are provided. A bottomed reservoir hole supplied from the bottom side, a reservoir piston that is slidable in the reservoir hole, a reservoir spring that urges the reservoir piston toward the bottom side of the reservoir hole, and the reservoir spring A spring receiving member that supports and seals the reservoir hole; and a communication hole that is formed in the pump body and allows air between the reservoir piston and the spring receiving member to escape to a large volume room or the outside. A brake fluid pressure control device for a vehicle comprising: the contact hole between the reservoir piston and the spring receiving member during a full stroke. Minute, characterized in that connecting.

  According to the first aspect of the present invention, since the communication hole is connected to the contact portion between the reservoir piston and the spring receiving member at the time of the full stroke, the reservoir piston is in a full stroke, that is, the reservoir piston is Until contact with the spring receiving member, air between the reservoir piston and the spring receiving member is released to a large volume room or the outside through the communication hole.

  A second aspect of the present invention is the vehicle brake hydraulic pressure control apparatus according to the first aspect, wherein the spring receiving member has an auxiliary passage that opens to the reservoir piston side and the side wall side of the reservoir hole. The communication hole is formed and opens to the auxiliary passage formed in the spring receiving member so as to be connected to the contact portion via the auxiliary passage.

  According to the second aspect of the present invention, the air between the reservoir piston and the spring receiving member is volumed via the auxiliary passage and the communication hole formed in the spring receiving member until the full stroke of the reservoir piston. It is escaped to a big room. In the structure in which the auxiliary passage is formed in the spring receiving member in this way, it is not necessary to open the communication hole on the sliding surface of the reservoir hole with the reservoir piston, so that burr is generated along with the formation of the communication hole. However, the reservoir piston works well without being caught by burrs.

  According to a third aspect of the present invention, the spring receiving member is formed in a substantially bottomed cylindrical shape and is provided so that its opening faces the reservoir piston side, and the auxiliary passage is provided on the spring receiving member. 3. The vehicular brake hydraulic pressure control device according to claim 2, wherein the brake hydraulic pressure control device for a vehicle is formed in a groove shape so as to come out from the inside to the outside at the opening end, and the spring receiving member is disposed around the spring receiving member and the reservoir hole. A positioning portion for positioning in the direction is provided.

  According to the third aspect of the invention, when the positioning portion of the spring receiving member is attached while being aligned with the positioning portion of the reservoir hole, the groove-shaped auxiliary passage formed in the spring receiving member is positioned at the opening of the communication hole. Become.

  A fourth aspect of the present invention is the vehicle brake hydraulic pressure control device according to the first aspect, wherein an auxiliary passage connected to the contact portion is provided between the reservoir piston and a side wall of the reservoir hole. In addition, the communication hole is connected to the contact portion through the auxiliary passage by opening in the auxiliary passage formed in the side wall of the reservoir hole.

  Here, as a method of providing the auxiliary passage between the reservoir piston and the sidewall of the reservoir hole, for example, a method of forming the auxiliary passage only in the reservoir piston, a method of forming the auxiliary passage only in the sidewall of the reservoir hole, There is a method of forming an auxiliary passage on both the piston and the side wall of the reservoir hole. The shape of the auxiliary passage is arbitrary. For example, a groove formed on the outer peripheral portion of the reservoir piston or the surface of the side wall of the reservoir hole may be used as the auxiliary passage. An annular step formed by varying the inner diameter may be used as the auxiliary passage.

  According to the fourth aspect of the present invention, the auxiliary passage provided between the reservoir piston and the side wall of the reservoir hole is provided between the reservoir piston and the spring receiving member until the reservoir piston makes a full stroke. And it is escaped to a room with a large volume through the communication hole. In the structure in which the auxiliary passage is provided between the reservoir piston and the side wall of the reservoir hole in this way, for example, even when the auxiliary passage is formed in a groove shape along the axial direction of the reservoir hole, the spring receiving member is not provided. Since it is not necessary to position when attaching to the reservoir hole, the attaching operation becomes easy.

  A fifth aspect of the present invention is the vehicle brake hydraulic pressure control device according to any one of the first to fourth aspects, wherein the large volume chamber is integrated with the pump body. It is a room sealed by a control housing or a motor case to be fixed, and the communication hole communicates with this room.

  According to the fifth aspect of the present invention, until the reservoir piston makes a full stroke, the air between the reservoir piston and the spring receiving member escapes to the room sealed by the control housing, for example, through the communication hole. It is. By connecting the communication hole to a room sealed with a control housing or the like in this way, for example, even if the entire brake fluid pressure control device for a vehicle is covered with water, the intrusion of water into the communication hole or the like may occur. Is prevented by.

  A sixth aspect of the present invention is the vehicle brake hydraulic pressure control apparatus according to the fifth aspect, wherein the control housing or the motor case prevents intrusion of water from outside and only air enters and exits. It is characterized in that it communicates with the outside through a ventilation waterproofing member that allows the

  According to the invention described in claim 6, since the control housing or the like communicates with the outside through the ventilation waterproof member, the entry of water into the room formed by the control housing or the like is prevented by the ventilation waterproof member. The room is always kept at atmospheric pressure. Therefore, water can be prevented from entering the communication hole, and even if, for example, the air between the reservoir piston and the spring receiving member or the air in the control housing expands as the temperature rises, the air is ventilated and waterproof. Thus, the pressure inside the cylinder is maintained at atmospheric pressure, and the reservoir piston operates well.

  According to the first aspect of the present invention, the communication hole is connected to the contact portion between the reservoir piston and the spring receiving member at the time of the full stroke, so that the reservoir piston and the spring receiver are kept until the reservoir piston reaches the full stroke. Since the air between the members can be surely released to a room with a large volume or the like, the operability of the reservoir piston can be ensured until the reservoir piston is fully stroked.

  According to the second aspect of the present invention, even if a burr is generated along with the formation of the communication hole by opening the communication hole in the auxiliary passage formed in the spring receiving member, the burr protrudes into the auxiliary passage. This does not affect the sliding surface with the reservoir piston, so that the reservoir piston can be operated satisfactorily.

  According to the third aspect of the present invention, the groove formed at the opening end of the spring receiving member is surely positioned at the opening of the communication hole only by attaching the positioning portion of the spring receiving member to the positioning portion of the reservoir hole. be able to.

  According to the fourth aspect of the present invention, since the auxiliary passage is provided between the reservoir piston and the side wall of the reservoir hole, for example, the contact portion of the reservoir piston and the spring receiving member and the opening of the communication hole are provided in one groove. Even when the auxiliary passages are connected to each other, it is not necessary to position the spring receiving member when attaching the spring receiving member to the reservoir hole.

  According to the fifth aspect of the present invention, since the communication hole communicates with the room sealed by the control housing or the like, for example, even if the entire brake fluid pressure control device for a vehicle is covered with water, Intrusion can be prevented by a control housing or the like.

  According to the sixth aspect of the present invention, water permeation from the outside is prevented by the ventilation waterproofing member, so that water permeation into the communication hole can be reliably prevented. In addition, since the air enters and exits through the ventilation waterproof member, the pressure between the reservoir piston and the spring receiving member, the inside of the control housing, etc. is always maintained at the atmospheric pressure, so that the reservoir piston can be operated well. it can.

[First Embodiment]
Next, a first embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is a brake hydraulic circuit diagram of a vehicle brake hydraulic pressure control device according to the first embodiment, and FIG. 2 is an exploded perspective view of the vehicle brake hydraulic pressure control device according to the first embodiment. 3 is an enlarged perspective view (a) showing the first mounting surface side of the pump body and an enlarged perspective view (b) showing the second mounting surface side of the pump body. 4 is a cutaway perspective view showing the structure in the vicinity of the through hole formed in the pump body, FIG. 5 is a sectional view showing the structure of the oil passage in the pump body, and FIG. 6 is an enlarged sectional view showing the structure in the vicinity of the reservoir. (A) and an expanded sectional view (b) which shows a reservoir at the time of a full stroke. The direction of the vehicle brake fluid pressure control device A in FIG. 5 is the direction when it is mounted on the vehicle. This is achieved by facilitating attachment of a master cylinder M, which will be described later, and pipes (not shown) connected to the wheel brakes FL, RR, RL, FR, and a vent hole 133, which will be described later, directed downward. This is to reduce the possibility of water wetting. Hereinafter, the vertical direction and the horizontal direction are referred to FIG.

First, with reference to the brake fluid pressure circuit diagram of FIG. 1, the function of each component in the vehicle brake fluid pressure control device A will be briefly described.
The vehicle brake fluid pressure control device A is disposed between a master cylinder M that generates a brake fluid pressure corresponding to the pedaling force applied by the driver to the brake pedal P, and the wheel brakes FL, RR, RL, FR. . Two output ports M1, M2 of the master cylinder M are connected to an inlet port 121 of a pump body 100 (see FIG. 2) described later, and an outlet port 122 of the pump body 100 is connected to each wheel brake FL, RR, RL, FR. It is connected to the. 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 A so that the pedal force of the brake pedal P is applied to each wheel brake FL, RR, RL, It is transmitted to the FR.

  The vehicle brake hydraulic pressure control device A is provided with four inlet valves 1, four outlet valves 2, and four check valves 1a corresponding to the respective wheel brakes FL, RR, RL, FR. In addition, two reservoirs 3, two pumps 4, two dampers 5, and two orifices 5a are provided corresponding to the output hydraulic pressure paths 91 and 92 corresponding to the output ports M1 and M2, respectively. The electric motor 20 for driving is provided.

  The inlet valve 1 is a normally open solenoid valve disposed between each wheel brake FL, RR, RL, FR and the master cylinder M. The inlet valve 1 is normally open to allow the brake hydraulic pressure to be transmitted from the master cylinder M to the wheel brakes FL, RR, RL, FR. Further, the inlet valve 1 is blocked by a control device (not shown) when the wheel is about to be locked, so that the hydraulic pressure transmitted from the brake pedal P to each wheel brake FL, RR, RL, FR is cut off. .

  The outlet valve 2 is a normally closed electromagnetic valve disposed between each wheel brake FL, RR, RL, FR and each reservoir 3. Although the outlet valve 2 is normally closed, the brake fluid pressure applied to each wheel brake FL, RR, RL, FR is released by a control device (not shown) when the wheel is about to lock. Relief to each reservoir 3

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

The reservoir 3 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 91 and 92 reduced by the absorption of the brake hydraulic pressure by the reservoir 3 is recovered.

Next, a specific structure of the vehicle brake fluid pressure control device A, particularly a structure near the reservoir 3 will be described in detail.
As shown in FIG. 2, the vehicle brake fluid pressure control device A is integrally fixed to a pump body 100 in which an oil passage serving as a passage for brake fluid is formed and a first mounting surface 101 of the pump body 100. A control housing 10 in which the control unit 12 and the like are accommodated, and an electric motor 20 that is integrally fixed to the second mounting surface 102 of the pump body 100 and serves as power for the pump 4 (see FIG. 1) that sends brake fluid are mainly used. I have.

  The control housing 10 is a member formed in a box shape having an opening on the pump body 100 side, and the opening is a bolt 43 (only one is illustrated) via a seal member 11 on the first mounting surface 101 of the pump body 100. ) To form a sealed room (a large volume room) R1 for accommodating the electronic control unit 12 and the like (see FIG. 5).

  The electric motor 20 mainly includes a motor case 21, a motor cover 22 and a rotor 23. The motor case 21 is a member formed in a substantially bottomed cylindrical shape. When the motor cover 22 is press-fitted into the opening thereof, a room for accommodating the rotor 23 therein as shown in FIG. (Room with large volume) R2 is formed. The output shaft 23 a of the rotor 23 is rotatable by a ball bearing 24 fixed to the bottom of the motor case 21, a ball bearing 25 fixed to the motor cover 22, and a ball bearing 26 fixed to the pump body 100. It is supported by. An eccentric shaft portion 27 is provided at an appropriate position of the output shaft 23a (a portion located between the ball bearings 25 and 26), and the eccentric shaft portion 27 reciprocates the plunger 41 of the pump 4. A ball bearing 28 is provided to press the plunger 41 as appropriate on its outer peripheral surface.

  The room R2 formed by the motor case 21 and the motor cover 22 communicates with the outside through the gap of the motor connection terminal 23b. However, as shown in FIG. 30 is attached to the second mounting surface 102 of the pump body 100 via a bolt 42 (only one is shown), and the control housing 10 is mounted to the first mounting surface 101 via the seal member 11 to Is in a blocked (sealed) state.

  As shown to Fig.3 (a), the pump body 100 is a metal component formed in a substantially rectangular shape, and it depends on various devices to be attached to holes formed in each surface thereof, oil passages appropriately formed therein, and the like. The above-described brake hydraulic circuit (see FIG. 1) is constructed. Below, the hole etc. which are formed in each surface of this pump body 100 are demonstrated in detail.

  The first mounting surface 101 is formed with four inlet valve mounting holes 111 and four outlet valve mounting holes 112 for mounting the four inlet valves 1 and the four outlet valves 2 (see FIG. 1). In addition, a through hole 131 that penetrates to the second mounting surface 102 side is formed at the center of the lower portion. The above-described four outlet ports 122 are formed on the upper surface 103.

  As shown in FIG. 3B, the second mounting surface 102 is formed with the two inlet ports 121 described above, a motor mounting hole 132 to which the output shaft 23a of the electric motor 20 is mounted, and the like. On the lower surface 104, two reservoir holes 113 for forming the two reservoirs 3 (see FIG. 1) are formed. Each of the side surfaces 105 and 106 is formed with a pump hole 114 for attaching the pump 4 and a damper hole 115 functioning as the damper 5 (see FIG. 1) by attaching a lid to the opening. Yes. The pump hole 114 communicates with the motor mounting hole 132 shown in FIG.

  As shown in FIG. 4, the through hole 131 is a hole through which a motor connection terminal 23 b for supplying electric power to the rotor 23 is inserted. The motor connection terminal 23 b protrudes into the control housing 10. Are connected to the electronic control unit 12 via a bus bar (not shown). That is, the through hole 131 allows the room R1 in the control housing 10 and the room R2 in the motor case 21 to communicate with each other. Further, a step-like vent hole 133 communicating with the through hole 131 and the outside is formed at an appropriate position of the through hole 131, and a vent waterproofing member G is provided in the vent hole 133. Here, the ventilation waterproof member G is a member that prevents intrusion of water from the outside and allows only the entry and exit of air. For example, the well-known Gore-Tex (registered trademark) is adopted as the ventilation waterproof member G. be able to.

Next, the relationship between each hole and the oil passage will be described below.
As shown in FIG. 5, the inlet port 121 communicates with the inlet valve mounting hole 111 via the first oil passage 141, and this inlet valve mounting hole 111 communicates with the outlet port 122 via the second oil passage 142. In addition, the outlet valve mounting hole 112 communicates with the third oil passage 143. The outlet valve mounting hole 112 communicates with the pump hole 114 via the fourth oil passage 144, and the pump hole 114 communicates with the reservoir hole 113 via the fifth oil passage 145. Further, as shown in FIG. 4, the pump hole 114 communicates with the damper hole 115 through the sixth oil passage 146, and the inlet port 121 (see FIG. 1) through the orifice 5 a shown in FIG. 1 and an oil passage (not shown). 5).

  As a result, as shown in FIG. 5, in a normal state, the brake fluid flowing in from the inlet port 121 goes out from the outlet port 122 through the normally open type inlet valve 1. When the wheel is about to lock, the inlet valve 1 is closed and the outlet valve 2 is opened, so that the brake fluid returning from the outlet port 122 flows around the inlet valve 1 and the outlet valve 2. And enters the reservoir hole 113 through the periphery of the pump 4. When the brake fluid in the reservoir hole 113 is returned to the inlet port 121, the brake fluid is sucked into the pump 4 from the reservoir hole 113 by driving the pump 4, and the sucked brake fluid is the damper shown in FIG. After the pressure fluctuation is attenuated by the hole 115 and the orifice 5a (not shown) (see FIG. 1), it is returned to the inlet port 121 through an oil passage (not shown).

Next, the structure near the reservoir hole 113 will be described in detail.
As shown in FIG. 6 (a), the reservoir hole 113 is a bottomed cylindrical hole, and the fifth oil passage 145 opens at the bottom 113a, so that the brake fluid passing through the fifth oil passage 145 is allowed to flow. It is supplied from the bottom 113a side. The reservoir 3 provided in the reservoir hole 113 is mainly constituted by a reservoir piston 31, a reservoir spring 32, and a spring receiving member 33.

  The reservoir piston 31 is a member formed in a substantially bottomed cylindrical shape. The reservoir piston 31 is disposed in the reservoir hole 113 so that its opening faces downward (on the spring receiving member 33 side), and its outer peripheral surface is the reservoir hole 113. It is slidable on the inner peripheral surface. Further, two groove portions 31a and 31b are formed on the outer peripheral surface of the reservoir piston 31 along the circumferential direction thereof. Of these grooves 31a and 31b, a seal member 34 for preventing leakage of brake fluid and air is provided in the lower groove 31b.

  The reservoir spring 32 constantly urges the reservoir piston 31 toward the bottom 113 a of the reservoir hole 113, and is disposed in a contracted state between the reservoir piston 31 and the spring receiving member 33.

  The spring receiving member 33 is a member formed in a substantially bottomed cylindrical shape, and is fitted in the reservoir hole 113 so that its opening faces upward (reservoir piston 31 side). An auxiliary passage 33a and a groove 33b are formed on the outer peripheral surface of the spring receiving member 33 along the circumferential direction. The auxiliary passage 33a is a passage formed in a step shape by cutting out the outer peripheral portion of the open end of the spring receiving member 33 along the circumferential direction, and a space R3 (hereinafter referred to as a space R3) between the spring receiving member 33 and the reservoir piston 31. , Also referred to as “spring chamber R3”) and a communication hole 151 to be described later. In other words, the auxiliary passage 33 a is open to the reservoir piston 31 side and the side wall 113 b side of the reservoir hole 113.

  The groove 33b is provided with an O-ring 35 for preventing water and the like from entering the spring chamber R3 from the outside. As a result, the spring receiving member 33 allows the spring 33 to be inserted into the reservoir hole 113 (specifically, the spring chamber). R3) is sealed. Further, a tapered clip engaging portion 33d is formed on the outer peripheral portion of the bottom portion 33c of the spring receiving member 33, and a C-shaped clip C for retaining is engaged with the clip engaging portion 33d. Thus, the spring receiving member 33 supports the reservoir spring 32 without being pulled out by the biasing force of the reservoir spring 32. The clip C is attached to a groove 113c formed in the side wall 113b in the vicinity of the opening end of the reservoir hole 113, so that the downward movement is restricted.

  In addition, a communication hole 151 communicating with the spring chamber R3 and the room R1 is formed in the side wall 113b of the reservoir hole 113 in order to allow air in the spring chamber R3 to escape to the room R1 in the control housing 10. Specifically, the communication hole 151 is formed so as to open to the auxiliary passage 33a of the spring receiving member 33 fixed in the reservoir hole 113, and as shown in FIG. The hole 151 is formed through the auxiliary passage 33a so as to be connected to the contact portion TP between the reservoir piston 31 and the spring receiving member 33 during the full stroke. In other words, the communication hole 151 is formed to open to the auxiliary passage 33a formed adjacent to the contact portion TP.

Next, the operation of the reservoir 3 will be described.
As shown in FIG. 5, when brake fluid is supplied from the fifth oil passage 145 into the reservoir hole 113, the reservoir piston 31 pressed by the pressure of the brake fluid (brake fluid pressure) moves downward. When the reservoir piston 31 is lowered in this way, the air in the spring chamber R3 is discharged to the room R1 in the control housing 10 through the auxiliary passage 33a and the communication hole 151. As a result of the air being discharged from the spring chamber R3 in this way, the amount of air in the chamber R1 increases. The increased amount of air passes through the through holes 131 and the vent holes 133 shown in FIG. It will be discharged to the outside.

  Incidentally, the air flowing between the spring chamber R3 and the chamber R1 in the control housing 10 is, as shown in FIG. 6 (b), when the reservoir piston 31 abuts against the spring receiving member 33 (during full stroke). ) It is cut off for the first time. That is, as described above, the communication hole 151 is formed so as to be connected to the contact portion TP between the reservoir piston 31 and the spring receiving member 33 via the auxiliary passage 33a. The spring chamber R3 and the chamber R1 in the control housing 10 are always maintained in communication with each other. Therefore, the reservoir piston 31 operates smoothly without being affected by the compression of the air in the spring chamber R3 until the full stroke.

According to the above, the following effects can be obtained in the first embodiment.
The communication hole 151 is connected to the contact portion TP between the reservoir piston 31 and the spring receiving member 33 during the full stroke through the auxiliary passage 33a, so that the reservoir piston 31 in the spring chamber R3 until the full stroke is reached. Since air can be surely released to the outside, the operability of the reservoir piston 31 can be ensured until the reservoir piston 31 is fully stroked.

  By opening the communication hole 151 in the auxiliary passage 33a formed in the spring receiving member 33, even if a burr is generated along with the formation of the communication hole 151, the burr only protrudes into the auxiliary passage 33a, and the reservoir piston 31 Therefore, the reservoir piston 31 can be operated satisfactorily. Further, since there is no need to worry about the influence of burrs in this way, the communication hole 151 can be processed from the first mounting surface 101 side of the pump body 100 instead of from the reservoir hole 113 side. Processing work becomes easy.

  Since the entry of water from the outside is prevented by the ventilation waterproofing member G, the entry of water into the communication hole 151 can also be reliably prevented. Further, since air enters and exits through the ventilation waterproof member G, the pressure in the spring chamber R3 and the room R1 in the control housing 10 is always maintained at atmospheric pressure, so that the reservoir piston 31 can be operated satisfactorily. Can do.

As described above, the present invention is not limited to the first embodiment and can be implemented in various forms.
In the first embodiment, the spring chamber R3 and the chamber R1 in the control housing 10 are communicated with each other. However, the present invention is not limited to this, for example, by opening the communication hole 151 on the second mounting surface 102 side. The spring chamber R3 and the chamber R2 in the electric motor 20 may communicate with each other.

  In the first embodiment, the auxiliary passage 33a is formed in the spring receiving member 33 so that the communication hole 151 is connected to the contact portion TP between the reservoir piston 31 and the spring receiving member 33 during the full stroke via the auxiliary passage 33a. However, the present invention is not limited to this. For example, without forming the auxiliary passage 33a in the spring receiving member 33, by forming the opening 151a of the communication hole 151 so as to be adjacent to the contact portion TP between the reservoir piston 31 and the spring receiving member 33 during the full stroke, The communication hole 151 may be directly connected to the contact portion TP.

[Second Embodiment]
The second embodiment of the present invention will be described below. Since this embodiment is obtained by partially changing the structure of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the drawings to be referred to, FIG. 7 is an enlarged cross-sectional view (a) showing the structure in the vicinity of the reservoir according to the second embodiment, and a perspective view (b) showing the spring receiving member.

  As shown in FIG. 7A, the reservoir 3 ′ according to the second embodiment includes a reservoir piston 31 and a reservoir spring 32 similar to those of the first embodiment, and has a shape different from that of the first embodiment. The spring receiving member 51 is provided. The reservoir hole 161 according to the second embodiment has substantially the same structure as the reservoir hole 113 according to the first embodiment, but differs in the shape of the opening end side. Hereinafter, the structure of the spring receiving member 51 and the reservoir hole 161 will be described in detail.

  As shown in FIG. 7B, the spring receiving member 51 is a metal part formed into a hat shape by press molding. A groove portion 51b extending from the inner side of the spring receiving member 51 to the outer side is formed in the flange portion (opening end) 51a of the spring receiving member 51 by press molding. The spring receiving member 51 and the groove 51b are not limited to press molding and may be formed by any method.

  As shown in FIG. 7A, a large-diameter groove 161b having a larger diameter than the outer edge of the flange 51a of the spring receiving member 51 is formed on the side wall 161a on the open end side (lower end side) of the reservoir hole 161. In addition, a claw portion 161c that is caulked by a device (not shown) is formed to fix the flange portion 51a of the spring receiving member 51 below the large-diameter groove portion 161b. In addition, by caulking the claw portion 161c in this way, the inside of the spring chamber R3 is sealed by the claw portion 161c and the flange portion 51a.

  The large-diameter groove 161b has a communication hole 152 formed so as to be inclined downward from the room R1 in the control housing 10 toward the reservoir hole 161 side. That is, the communication hole 152 is connected to the spring chamber R3 via the large-diameter groove 161b and the groove 51b formed in the spring receiving member 51.

  Of the walls forming the large diameter groove portion 161b, the lower wall 161d is formed to have substantially the same diameter as the outer diameter of the flange portion 51a of the spring receiving member 51, and thereby the upper wall 161e of the large diameter groove portion 161b. Is a stopper when the spring receiving member 51 is attached. Furthermore, the width of the bottom portion 161f of the large-diameter groove portion 161b is formed to be smaller than the thickness of the flange portion 51a, whereby the lower wall 161d and the flange portion 51a come into contact with each other when the spring receiving member 51 is attached. The receiving member 51 is positioned in the horizontal direction.

Next, a method for attaching the spring receiving member 51 according to the second embodiment will be described.
As shown in FIG. 7A, after the reservoir piston 31 and the reservoir spring 32 are sequentially set in the reservoir hole 161, the claw portion 161c is crimped while pressing the spring receiving member 51 against the upper wall 161e. At this time, even if the groove 51b of the spring receiving member 51 is positioned on the opposite side of the communication hole 152 as shown, the spring chamber R3 includes the groove 51b, the large-diameter groove 161b, and the communication hole 152. And communicates with the room R1 in the control housing 10.

According to the above, the following effects can be obtained in the second embodiment.
When attaching the spring receiving member 51 to the reservoir hole 161, it is not necessary to position the spring receiving member 51 in the circumferential direction, so that the attaching operation becomes easy.

As described above, the present invention is not limited to the second embodiment and can be implemented in various forms.
In the second embodiment, the groove 51b is formed in the spring receiving member 51, and the large-diameter groove 161b is formed in the side wall 161a of the reservoir hole 161, so that the positioning of the spring receiving member 51 in the circumferential direction is unnecessary. The present invention is not limited to this, and for example, a structure as shown in FIG.

  In this structure, a spring receiving member 52 having a structure in which the groove 51b is removed from the spring receiving member 51 according to the second embodiment, and a reservoir hole 162 having a slightly different shape from the second embodiment are provided. . The reservoir hole 162 is formed with a claw portion 162a similar to that of the second embodiment on the open end (lower end) side, and the flange portion 52a of the spring receiving member 52 is fitted on the claw portion 162a. A fitting groove 162b is formed. Further, on the upper side of the fitting groove 162b, an intermediate diameter step portion having a smaller diameter than the fitting groove 162b and a larger diameter than the side wall 162c (sliding surface with the reservoir piston 31 ′) of the reservoir hole 162. 162d is formed. A communication hole 152 is opened in the medium diameter step 162d. Further, the upper boundary wall portion 162e of the medium diameter step portion 162d is formed so that the corner portion on the inside thereof has a gently curved surface shape (R shape).

  Further, the reservoir piston 31 ′ has substantially the same structure as the reservoir piston 31 according to the first embodiment, but as shown in FIG. 8B, the reservoir piston 31 ′ has a lower end from a groove portion 31b for attaching the seal member 34. The length of the first embodiment is such that the opening of the groove D formed by the medium diameter step portion 162d and the flange portion 52a of the spring receiving member 52 can be closed. Is different.

  Even with such a structure, it is not necessary to position the spring receiving member 52 in the circumferential direction. Further, in this structure, the length from the groove portion 31b to the lower end of the reservoir piston 31 ′ is formed to be a length capable of closing the opening of the groove D. Therefore, the seal member 34 is also in full stroke. Therefore, the reservoir piston 31 'operates well without being caught in the groove D. Further, by forming the corner portion of the boundary wall portion 162e into a gentle R shape, for example, even if the reservoir piston 31 ′ is made of resin, the outer peripheral surface of the reservoir piston 31 ′ is formed at the corner portion of the boundary wall portion 162e. Since it is not damaged and becomes stepped, the operability of the reservoir piston 31 'can be ensured.

  In the structure shown in FIG. 8, the length from the groove 31b to the lower end of the reservoir piston 31 ′ is increased so that the seal member 34 does not reach the groove D even during a full stroke. For example, a structure as shown in FIG. 9A may be used so that the groove D is not covered with the groove D. In this structure, instead of increasing the length from the groove 31b to the lower end of the reservoir piston 31 ′ as in the structure shown in FIG. 8, a rib 52b that extends upward from the flange 52a of the spring receiving member 52 is formed. As shown in FIG. 9 (b), the seal member 34 is not applied to the groove D even during a full stroke. As a reservoir piston used in this structure, a short reservoir piston 31 similar to that of the first embodiment may be provided.

  Further, in the structure shown in FIG. 8, the medium diameter step portion 162 d which is an auxiliary passage is formed on the side wall 162 c of the reservoir hole 162. However, the present invention is not limited to this, and the auxiliary passage is not limited to this. And the reservoir piston 31 ′. For example, as shown in FIGS. 10A and 10B, instead of providing the medium diameter step 162d (see FIG. 8) on the side wall 162c of the reservoir hole 162, the outer periphery of the reservoir piston 31 ′ (the seal member 34) A middle diameter step (auxiliary passage) 31c having a smaller diameter than the outermost periphery may be formed in the lower part) so as to open downward.

[Third Embodiment]
The third embodiment of the present invention will be described below. Since this embodiment is obtained by partially changing the structure of the second embodiment, the same components as those of the second embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the drawings to be referred to, FIG. 11 is an enlarged sectional view (a) showing a structure in the vicinity of the reservoir according to the third embodiment, and an XX sectional view (b) in FIG.

  As shown in FIG. 11A, the reservoir 3 ″ according to the third embodiment includes the same reservoir piston 31 and reservoir spring 32 as those of the second embodiment, and the spring receiver according to the second embodiment. 11 includes a spring receiving member 53 in which the shape of the member 51 is partially changed, and the spring receiving member 53 has a groove 53b similar to the above in a part of the flange 53a as shown in FIG. And a convex portion (positioning portion) 53c bulging outward is formed on the opposite side of the groove portion 53b (the opposite side across the center of the spring receiving member 53).

  The side wall 163a on the lower end side of the reservoir hole 163 is formed with a claw portion 163b that is substantially the same as that of the second embodiment, and the flange portion 53a of the spring receiving member 53 is fitted to the upper side of the claw portion 163b. A fitting groove 163c is formed. The fitting groove 163 c has a communication hole 152 similar to that of the second embodiment at a part thereof, and the opposite side of the opening of the communication hole 152 (the opposite side across the center of the reservoir hole 163). ) Is formed with a concave portion (positioning portion) 163d that matches the convex portion 53c of the spring receiving member 53 described above.

Next, a method for attaching the spring receiving member 53 according to the third embodiment will be described.
As shown in FIGS. 11A and 11B, when the convex portion 53c of the spring receiving member 53 is attached while being aligned with the concave portion 163d of the reservoir hole 163, the groove portion 53b formed in the spring receiving member 53 opens the communication hole 152. Will be located.

According to the above, the following effects can be obtained in the third embodiment.
The groove 53b formed in the spring receiving member 53 can be reliably positioned at the opening of the communication hole 152 simply by attaching the convex portion 53c of the spring receiving member 53 to the concave portion 163d of the reservoir hole 163. Note that the structure of this embodiment is effective when the large-diameter groove portion 161b (see FIG. 7A) of the second embodiment cannot be formed for some reason.

As described above, the present invention is not limited to the third embodiment, and can be implemented in various forms.
In the third embodiment, the spring receiving member 53 is provided with the convex portion 53c and the reservoir hole 163 is provided with the concave portion 163d. However, the present invention is not limited to this, and for example, the convex portion and the concave portion are provided opposite to the present embodiment. May be. Furthermore, positioning may be performed by using the structure shown in FIG.

  As shown in FIG. 12A, in this structure, instead of providing the spring receiving member 53 with the convex portion 53c and the reservoir hole 163 with the concave portion 163d as in the third embodiment, the spring receiver of the second embodiment is used. A spring receiving member 54 obtained by partially changing the member 51 is provided. As shown in FIG. 12B, the spring receiving member 54 has a groove 54b similar to the above formed in a part of the flange 54a, and a mark indicating the groove 54b in the center of the bottom 54c. 54d is engraved. According to this structure, since the operator can know the position of the groove 54b of the spring receiving member 54 by the mark 54d, the worker only needs to align the mark 54d and the communication hole 152, so that the communication hole 152 and the groove part are aligned. 54b can be communicated. Further, since the mark 54d can be easily formed by engraving, it is possible to reduce the cost for processing the convex portion 53c and the concave portion 163d as in the third embodiment.

It is a brake fluid pressure circuit diagram of the brake fluid pressure control device for vehicles concerning a 1st embodiment. 1 is an exploded perspective view of a vehicle brake hydraulic pressure control device according to a first embodiment. They are the expansion perspective view (a) which shows the 1st attachment surface side of a pump body, and the expansion perspective view (b) which shows the 2nd attachment surface side of a pump body. It is a fracture | rupture perspective view which shows the structure of the through-hole vicinity formed in the pump body. It is sectional drawing which shows the structure of the oil path in a pump body. They are an expanded sectional view (a) which shows the structure near a reservoir, and an expanded sectional view (b) which shows a reservoir at the time of a full stroke. It is the expanded sectional view (a) which shows the structure of the reservoir | reserver vicinity which concerns on 2nd Embodiment, and the perspective view (b) which shows a spring receiving member. It is a figure which shows the modification of the structure of the reservoir vicinity which concerns on 2nd Embodiment, and is an expanded sectional view (a) which shows the state at the time of non-operation of a reservoir piston, and an expanded section which shows the state at the time of a full stroke of a reservoir piston FIG. It is a figure which shows the modification of the structure of FIG. 8, and is an expanded sectional view (a) which shows the state at the time of non-operation of a reservoir piston, and an expanded sectional view (b) which shows the state at the time of a full stroke of a reservoir piston. It is a figure which shows the modification of the structure of FIG. 8, and is an expanded sectional view (a) which shows the state at the time of non-operation of a reservoir piston, and an expanded sectional view (b) which shows the state at the time of a full stroke of a reservoir piston. It is an expanded sectional view (a) which shows the structure near the reservoir concerning a 3rd embodiment, and XX sectional view (b) of Drawing 11 (a). It is the expanded sectional view (a) which shows the modification of the structure of the reservoir vicinity which concerns on 3rd Embodiment, and the arrow line view (b) which looked at the spring receiving member of Fig.12 (a) from the arrow Y direction. It is an expanded sectional view showing the structure near the conventional reservoir.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Reservoir 10 Control housing 11 Seal member 20 Electric motor 21 Motor case 22 Motor cover 27 Seal member 31 Reservoir piston 33 Spring receiving member 33a Auxiliary passage 34 Seal member 35 O-ring 51 Spring receiving member 51a Groove 51b Groove 52 Spring receiving member 52a鍔 portion 52b rib 53 spring receiving member 53a 鍔 portion 53b groove portion 53c convex portion 54 spring receiving member 54a 鍔 portion 54b groove portion 54c bottom portion 54d mark 100 pump body 113 reservoir hole 113a bottom portion 113b side wall 113c groove portion 131 through hole 133 Oil passage 142 Second oil passage 143 Third oil passage 144 Fourth oil passage 145 Fifth oil passage 146 Sixth oil passage 151 Communication hole 151a Opening 152 Communication hole 161 Reservoir hole 161b Large diameter groove 62 reservoir hole 162b fitting groove 162d in diameter step portion 162e boundary wall portion 163 reservoir hole 163c fitting groove 163d recess A vehicle brake hydraulic pressure control apparatus G breathable waterproof member R1 room R2 room R3 spring chamber TP contact portion

Claims (6)

A pump body in which an oil passage serving as a passage for brake fluid is formed;
A bottomed reservoir hole that is formed in the pump body and through which the brake fluid passing through the oil passage is supplied from the bottom side;
A reservoir piston slidable in the reservoir hole;
A reservoir spring that urges the reservoir piston toward the bottom side of the reservoir hole;
A spring receiving member that supports the reservoir spring and seals the reservoir hole;
A vehicular brake hydraulic pressure control device comprising: a communication hole formed in the pump body and allowing air between the reservoir piston and the spring receiving member to escape to a large volume room or outside;
The vehicular brake hydraulic pressure control device, wherein the communication hole is connected to a contact portion between the reservoir piston and the spring receiving member during a full stroke. The vehicle brake fluid pressure control device according to claim 1,
The spring receiving member is formed with an auxiliary passage that opens to the reservoir piston side and the side wall side of the reservoir hole,
The vehicular brake hydraulic pressure control device according to claim 1, wherein the communication hole opens in the auxiliary passage formed in the spring receiving member, and is connected to the contact portion through the auxiliary passage. The spring receiving member is formed in a substantially bottomed cylindrical shape, and is provided so that its opening faces the reservoir piston side,
The vehicular brake hydraulic pressure control device according to claim 2, wherein the auxiliary passage is formed in a groove shape that extends from the inside to the outside at an opening end of the spring receiving member.
A brake fluid pressure control device for a vehicle, wherein a positioning portion for positioning the spring receiving member in the circumferential direction is provided in the spring receiving member and the reservoir hole. The vehicle brake fluid pressure control device according to claim 1,
Between the reservoir piston and the side wall of the reservoir hole is provided with an auxiliary passage connected to the contact portion,
The brake fluid pressure control device for a vehicle according to claim 1, wherein the communication hole is connected to the abutting portion through the auxiliary passage by opening the auxiliary passage. The vehicle brake hydraulic pressure control device according to any one of claims 1 to 4,
The large volume room is a room sealed by a control housing or a motor case fixed integrally to the pump body,
The vehicular brake hydraulic pressure control device, wherein the communication hole communicates with the room. The vehicle brake fluid pressure control device according to claim 5,
The control housing or the motor case is
A brake fluid pressure control device for a vehicle, wherein the brake fluid pressure control device for a vehicle is connected to the outside through a ventilation waterproofing member that prevents intrusion of water from outside and allows only air in and out.

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