JP3366148B2 - Waterproof structure in hydraulic control unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic control device,
The present invention relates to a waterproof structure in a hydraulic control device in which a reservoir and a damper provided in a housing are covered with a cover.

[0002]

2. Description of the Related Art A waterproof structure for such a hydraulic control device is already known from Japanese Utility Model Laid-Open No. 6-40402. In this device, a sealing member having a breathing groove is arranged on the outer surface of a stopper member that defines an atmosphere communication chamber of a reservoir of a hydraulic control device, and this seal member allows water to enter while allowing breathing in the atmosphere communication chamber. Is being prevented.

[0003]

By the way, in order to improve the waterproof property of the reservoir, it is possible to attach a cover so as to cover the outside of the sealing member. In this case, in order to discharge the water flowing into the inside of the cover to the outside and to secure the breathing action of the reservoir, it is necessary to form a drainage channel also serving as a ventilation hole in the lower part of the cover. However, when such a drainage channel is formed, water droplets or the like may enter from the drainage channel and enter the atmosphere communication chamber of the reservoir.

The present invention has been made in view of the above circumstances, and an object thereof is to further improve the waterproof property of a hydraulic control device covered by a cover.

[0005]

In order to achieve the above-mentioned object, the invention described in claim 1 closes the openings of the reservoir and the damper facing the side surface of the housing with a plug member,
Wherein the outer plug member, the hydraulic control apparatus Tsu covered by exist a predetermined space by a cover attached to the side of the housing, and a plurality of abutment surfaces formed on the cover is brought into contact with the side surface of the housing, the The lower part of the space is
Are separated from each other and communicate with the upper part of the space.
Is divided into the drainage, the lower edge of the cover, the lower surface of the housing
A is bent in the horizontal direction so that along to form a flange portion
At the same time, a gap is formed between the upper surface of the flange portion and the lower surface of the housing to connect the plurality of drainage channels to the atmosphere.
Characterized in that it was.

In addition to the structure of claim 1, the invention described in claim 2 is characterized in that the space facing the reservoir and the space facing the damper are partitioned by the abutting surface extending in the vertical direction. To do.

[0007]

According to the work for] of claim 1 configuration, water that has flowed into the space between the housings and the cover to flow downward, the space below
From multiple drainage channels on the upper surface of the flange at the bottom edge of the cover.
It is discharged to the outside through the gap between the lower surface of the housing .
Moreover, since the gap and the plurality of drainage channels form a labyrinth, it is possible to prevent water splashing from below from entering the space between the housing and the cover.

According to the second aspect of the invention, since the space facing the reservoir and the space facing the damper are partitioned by the contact surface extending in the vertical direction, the water flowing into both spaces is quickly discharged downward. In addition, the breathing of the reservoir prevents water and dust from being sucked in from the space facing the damper.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the present invention, FIG. 1 is a hydraulic circuit diagram of a vehicle antilock brake control device, and FIG. 2 is a partially cutaway side view of the antilock brake device (FIG. 4 is a sectional view taken along line 2-2 of FIG. 4, FIG. 3 is a partially cutaway side view of the antilock brake device (a sectional view taken along line 3-3 of FIG. 4), and FIG. 4 is a view taken along the line 4-4 of FIG. 5 is an enlarged view of part 5 in FIG.

First, in FIG. 1, the tandem type master cylinder M is provided with a pair of output ports 12 and 13 for outputting a braking hydraulic pressure according to the depression of the brake pedal P.
Wheel brake B _FL for left front wheel, wheel brake B _RR for right rear wheel
Between the proportional pressure reducing valve 14 _R , the front right wheel wheel brake B _FR , and the left rear wheel wheel brake B _RL connected to the proportional pressure reducing valve 14 _L, and the both output ports 12 and 13. A lock brake control device 15 is provided.

This anti-lock brake control device 15
_Are four _normally open solenoid valves V _OFL individually corresponding to the wheel brake B _FL for the front left wheel, the wheel brake B _RR for the rear right wheel, the wheel brake B _FR for the front right wheel and the wheel brake B _RL for the rear left wheel,
V _ORR , V _OFR , V _ORL and each normally open solenoid valve V _OFL ~ V
Four check valves 17 connected in parallel to each _ORL
FL , 17 _RR , 17 _FR , 17 _RL and the wheel brakes B
Four normally closed solenoid valves V _CFL that individually correspond to _{FL to} B _RL ,
V _CRR , V _CFR , V _CRL and wheel brake B _FL for the left front wheel
And a pair of reservoirs 19 ₁ and 19 ₂ respectively corresponding to the wheel brake B _RR side for the right rear wheel, the wheel brake B _FR for the right front wheel, and the wheel brake B _RL for the left rear wheel, and both reservoirs 19 ₁ , 19. intake valve 20 ₁ to _2, 20 ₂ and the pump 21 _1, 21 ₂ a pair of return which is connected via a two return pump 21 _1, 21 ₂ common to the motor 22, both back to the pump 21 _1, 21 ₂ A pair of dampers 24 ₁ and 24 ₂ connected via discharge valves 23 ₁ and 23 ₂ and an orifice provided between the output ports 12 and 13 of the master cylinder M and the dampers 24 ₁ and 24 ₂ respectively. Two
5 includes _1, 25 _2, and an electronic control unit 26 for switching and controlling the demagnetization-excitation of the normally open electromagnetic valves V _OFL ~V _ORL and the normally closed electromagnetic valves V _CFL ~V _CRL.

The _normally open solenoid valve V _OFL is a master cylinder M
One _normally- open solenoid valve V _ORR is provided between one output port 12 and the left front wheel brake B _FL, and the _normally open solenoid valve V _ORR is connected to the output port 12 and the right rear wheel brake B _RR. The _normally open solenoid valve V _OFR is installed between the valve 14 _R and
The _normally open solenoid valve V _ORL is provided between the other output port 13 of the master cylinder M and the wheel brake B _FR for the right front wheel.
Is provided between the output port 13 and the proportional pressure reducing valve 14 _L connected to the left rear wheel brake B _RL . The check valves 17 _{FL to} 17 _RL are assigned to the corresponding wheel brake B.
_The normally open solenoid valves V _{OFL to} V _ORL are connected in parallel so as to allow only the flow of the hydraulic fluid from _{FL to} B _RL .

The normally closed solenoid valve V _CFL is between the left front wheel brake B _FL and the reservoir 19 ₁ , and the normally closed solenoid valve V _CRR is between the proportional pressure reducing valve 14 _R and the reservoir 19 ₁ and is a normally closed solenoid valve. V _CFR is the wheel brake B _FR for the right front wheel and the reservoir 19
₂ and the normally closed solenoid valve V _CRL is provided between the proportional pressure reducing valve 14 _L and the reservoir 19 ₂ .

According to the anti-lock brake control device 15 as described above, the normally open solenoid valves V _{OFL to} V _ORL are demagnetized to open during normal braking in which each wheel is not likely to be locked. In addition, each normally closed solenoid valve V
_{CFL to} V _CRL are in the demagnetized state and are closed. Therefore, the brake fluid pressure output from one output port 12 of the master cylinder M acts on the wheel brake B _FL for the left front wheel via the _normally open solenoid valve V _OFL and the _normally open solenoid valve V _OFL.
The braking fluid pressure acting on the right rear wheel wheel brake B _RR via the _ORR and the proportional pressure reducing valve 14 _R and output from the other output port 13 of the master cylinder M is the normally open solenoid valve V
It acts on the wheel brake B _FR for the right front wheel via _OFR, and on the wheel brake B _RL for the left rear wheel via the _normally open solenoid valve V _ORL and the proportional pressure reducing valve 14 _L.

During anti-lock control when the wheel is about to enter the locked state during braking, the normally open solenoid valve corresponding to the wheel that is about to enter the locked state among the _normally open solenoid valves V _{OFL to} V _ORL. Is excited to close the valve, and at the same time, of the normally closed solenoid valves V _{CFL to} V _CRL , the normally closed solenoid valves corresponding to the wheels are excited and opened. Then, a part of the braking fluid pressure is released to the reservoir 19 ₁ or 19 ₂ to reduce the pressure. When the brake fluid pressure is maintained, the normally open solenoid valves V _{OFL to} V _ORL are excited to close the valve, and the normally closed solenoid valves V _{CFL to} V _CRL are demagnetized to maintain the closed state. Often, when increasing the braking fluid pressure, deenergize the normally open solenoid valves V _{OFL to} V _ORL and open them, and demagnetize the normally closed solenoid valves V _{CFL to} V _CRL to keep them closed. Good.

The motor 22 that drives the pair of return pumps 21 ₁ and 21 ₂ in common is operated during the antilock control, and the reservoirs 19 ₁ and 19
_The hydraulic fluid released to ₂ is returned from the pumps 21 ₁ and 21 ₂ to the dampers 24 ₁ and 24 ₂ and the orifices 25 ₁ and 25 _2.
And is returned to the upstream side of each normally open solenoid valve V _{OFL to} V _ORL . Therefore, the depression amount of the brake pedal P in the master cylinder M does not increase by the amount released to the reservoirs 19 ₁ and 19 ₂ , and the return pumps 21 ₁ and 2 2
The pulsation of the hydraulic fluid sent from 1 ₂ is the dampers 24 ₁ and 2
4 ₂ and the orifices 25 ₁ and 25 ₂ dampen the action, and the pulsation is not transmitted to the brake pedal P.

Whether the wheels are likely to enter the locked state in the electronic control unit 26 which controls the demagnetization / excitation of the normally open solenoid valves V _{OFL to} V _ORL and the normally closed solenoid valves V _{CFL to} V _CRL . Wheel speed sensors 27 _FL , 27 _RR , 27 _FR , 2 that individually detect the wheel speed of each wheel to determine whether
The _7RL detection signal is input, and the detection signal of the handbrake detection sensor 29 that detects whether or not the handbrake lever 28 is operated is input, and is activated by the electronic control unit 26 when in the antilock control state. An alarm 30 such as a lamp to be converted is connected to the electronic control unit 26.

As shown in FIGS. 2 and 3, the anti-lock brake control device 15 is provided with a block-shaped metal housing 31, and front and rear surfaces of the housing 31 are made of synthetic resin. 32 and the motor 22 are coupled. The mounting bracket 34 fixed to the vehicle body 33 includes one front support portion 34 ₁ and two left and right rear support portions 34 ₂ and 34 ₂ , and the front support portion 3
4 with resilient mounts means 35 provided on the front surface of the housing 31 is coupled with bolts 36 to _1, two right and left rear support portions 34 _2, 34 2 of the elastic mount means provided to the rear surface of the housing 31 to ₂ 37 , 37 are bolts 38, 3
Combined at 8. The two reservoirs 19 ₁ and 19 ₂ are arranged side by side in the left-right direction at the bottom of the housing 31.
The two dampers 24 ₁ and 24 ₂ are juxtaposed in the left-right direction outside the individual reservoirs 19 ₁ and 19 ₂ .

The structures of the _two reservoirs 19 ₁ and 19 ₂ are substantially the same, and the structure of _one of the reservoirs 19 ₁ will be described below as a representative thereof with reference to FIG.

The reservoir 19 ₁ is provided with a cylinder 41 having a bottomed cylindrical shape and opening on the front surface of the housing 31. Inside the cylinder 41, a cup-shaped piston 43 having an O-ring 42 mounted on the outer periphery is slidably fitted.
3 between the rear end and the closed end of the cylinder 41.
Variable pressure chamber 4 connected to the pump 21 ₁ via
5 is defined. An annular plug member 46 is fitted to the open end of the cylinder 41, and is axially fixed by a clip 47. The return spring 49 housed in the atmosphere communication chamber 48 defined between the piston 43 and the plug member 46 urges the piston 43 in the direction in which the volume of the pressure chamber 45 decreases. The cover 32 and the plug member 46 coupled to the front surface of the housing 31.
A rubber seal member 50 for preventing dust and water from entering the atmosphere communication chamber 48 is sandwiched therebetween.

The structures of the _two dampers 24 ₁ and 24 ₂ are substantially the same, and the structure of _one damper 24 ₁ will be described below as a representative thereof with reference to FIG.

The damper 24 ₁ has a bottomed cylindrical damper chamber 51 having an opening 51 ₁ in the front surface of the housing 31. The opening 51 ₁ of the damper chamber 51 is secured by a clip 54 fitted is plug member 53 fitted with O-ring 52 on the outer circumference.

As shown in FIGS. 2 to 4, four bolt holes 32 ₁ are formed in the cover 32, and the cover 32 is secured by four bolts 60 which penetrate the bolt holes 32 ₁ . It is coupled to the front surface of the housing 31. Further, a bolt hole 32 ₂ through which the bolt 36 of the elastic mount means 35 penetrates is formed in the lower central portion of the cover 32.

When the cover 32 is coupled to the housing 31, the upper abutment surface 32 extending along the upper edge of the cover 32.
₃ , left and right side contact surfaces 32 ₄ , 32 ₄ extending along the left and right side edges of the cover 32, a center rib 32 ₅ as a contact surface extending vertically in the lower center of the cover 32, and a center rib. 32 of the right and left as an abutment surface extending in the vertical direction on the left and right sides of the ₅ side ribs 32 _6, 32 ₆ and, center rib 32 ₅ and the side ribs 3 of the lower edge of the cover 32
Left and right lower contact surfaces 32 ₇ , projecting between 2 ₆ and 32 ₆
32 ₇ contacts the front surface of the housing 31. And
A flange portion 32 ₈ protruding in the horizontal direction is formed along the lower edge of the cover 32 along the lower surface of the housing 31.

The pair of reservoirs 19 ₁ and 19 ₂ includes a center rib 32 ₅ of the cover 32 and left and right side ribs 32 ₆ ,
And a pair of dampers 24 ₁ and 24, which face the two spaces 61 and 61 partitioned by 32 ₆ respectively.
₂ faces two spaces 62, 62 defined by the left and right side contact surfaces 32 ₄ , 32 ₄ of the cover 32 and the left and right side ribs 32 ₆ , 32 ₆ , respectively.

As will be apparent by referring to FIG. 5 together,
A mortar-shaped recess 32 ₉ is formed in each space 61 located inside, and a substantially annular projection 32 ₁₀ is provided so as to surround the outer periphery of the recess 32 ₉ . The upper half part of the protrusion 32 ₁₀ constitutes a semi-circular continuous waterproofing eaves part 32 ₁₁ , and the lower half part has five notches 32 ₁₂ ... And four pressing parts 3
2 ₁₃ are formed alternately. The outer peripheral portion 50 ₁ of the seal member 50 of the reservoirs 19 ₁ and 19 ₂ is fixed by being pressed into contact with the groove between the housing 31 and the plug member 46 by the protrusion 32 ₁₀ . The tip of the ventilation pipe 50 ₂ protruding from the center of the seal member 50 faces the bottom surface of the recess 32 _{9 of the} cover 32. The cover 32 and the seal member 50 are separated from each other by at least 1.5 mm or more so that water does not collect due to surface tension between them. A predetermined gap may be formed between the protrusion 32 ₁₀ and the outer peripheral portion 50 ₁ of the seal member 50.

[0028] In the lower portion of the spatial 61, the lower abutment surface 32
_{Between the 7} and the center rib 32 ₅ , the upper part of the space 61
A first drainage channel 63 (see FIG. 4) communicating with the lower contact surface 3 is also formed in the lower part of the space 61.
The upper part of the space 61 is located between 2 ₇ and the side rib 32 _6.
Second drainage path 64 communicating with (see FIGS. 4 and 5) are formed. In addition, at the bottom of the space 62, the side contact surface 32 ₄
And the side rib 32 ₆ communicate with the upper part of the space 62.
A third drainage channel 65 (see FIGS. 3 and 4) is formed. The lower surface of the housing 31 shown by the chain line in FIG. 4 and the cover
A gap is formed between the upper surface of the flange portion 32 ₈ of 32.
Due to this gap, the first to third drainage channels 63
~ 65 is in communication with the atmosphere.

Next, the operation of the embodiment of the present invention having the above construction will be described.

When the volume of the pressure chamber 45 of the reservoirs 19 ₁ and 19 ₂ expands and contracts and the piston 43 slides, the volume of the atmosphere communication chamber 48 also expands and contracts accordingly. For example, when the piston 43 moves to the right in FIG. 2 and the volume of the atmosphere communication chamber 48 increases, the upper surface of the flange 32 ₈ of the cover 32 and the housing 32.
Air is sucked into the space 61 through the first drainage channel 63 and the second drainage channel 64 from the gap between the lower surface of the groove 31 and
Through the notches 32 ₁₂ ... to reach the inside of the protrusion 32 ₁₀ .
From there, it is sucked into the atmosphere communication chamber 48 through the recess 32 _{9 of the} cover 32, the ventilation pipe 50 ₂ of the seal member 50 and the ventilation hole 46 ₁ of the plug member 46. Further, when the piston 43 moves to the left and the volume of the atmosphere communication chamber 48 is reduced, the air in the atmosphere communication chamber 48 is discharged to the atmosphere in the route opposite to the above.

Since no special sealing member is arranged on the joint surface between the housing 31 and the cover 32, the upper contact surface 32 ₃ and the side contact surfaces 32 ₄ , 3 of the cover 32 are arranged.
The water that has entered from 2 ₄ flows downward along the front surface of the housing 31, and the space 6 facing the reservoirs 19 ₁ and 19 _2
1 and 61 and the space 6 facing the dampers 24 ₁ and 24 ₂
2, 62. The water flowing into the space 61 is the projection 32.
Is blocked by the waterproof eaves portion 32 ₁₁ formed in the upper half of the ₁₀ flow laterally, from said first drain passage 63 and the second drainage path 64
It is discharged to the outside through the gap .

In this way, the inflow of water into the inside of the protrusion 32 ₁₀ is prevented, so that the infiltration of water into the atmosphere communication chamber 48 of the reservoirs 19 ₁ and 19 ₂ is prevented. Should 32
Even if water flows into the inside of ₁₀ , the ventilation pipe 5 of the seal member 50
0 ₂ and the recess 32 _{9 of the} cover 32 form a maze, so that the water does not enter the atmosphere communication chamber 48, and the notches 32 ₁₂ ..., The first drainage channel 63 and the second drainage channel 6
It is discharged to the outside through 4 and the gap .

Further, a possibility projections 32 ₁₀ because of pressing the outer peripheral portion 50 ₁ of the sealing member 50 in the groove between the housing 31 and the plug member 46, the waterproof lifted outer peripheral portion 50 ₁ of the sealing member 50 decreases Nor.

Space 6 facing the dampers 24 ₁ and 24 ₂
The water flowing into 2 flows downward as it is to the third drainage channel 6
5 is discharged to the outside through the gap . At this time, the spaces 61, 61 facing the reservoirs 19 ₁ , 19 ₂ and the spaces 62, 62 facing the dampers 24 ₁ , 24 ₂ are partitioned by the side ribs 32 ₆ , 32 _6, so that the spaces 62, 62 side Water is prevented from flowing into the spaces 61, 61 from the side, so that the possibility that water will enter the reservoirs 19 ₁ , 19 ₂ is further reduced. Further, the side ribs 32 ₆ and 32 ₆ reduce the possibility that dust will be sucked from the space 62, 62 side to the space 61, 61 side when the atmosphere communication chamber 48 of the reservoirs 19 ₁ , 19 ₂ breathes. .
Further, the center rib 32 ₅ and the side ribs 32 ₆ , 32
_{Since 6} extends in the vertical direction, spaces 61, 61, 6
Guide the water that has flowed into 2, 62 and quickly from the first to third drainage channels 63, 63, 64, 64, 65, 65 to the gap.
It has the function of being discharged to the outside via

When the lower surface of the housing 31 is splashed with water, the flange 32 ₈ of the cover 32 and the upper surface of the flange 32 ₈
The gap formed between the lower surface of the housing 31 and the first
~ The space 6 because the third drainage channels 63 , 63 , 64 , 64 , 65 , 65 form a labyrinth bent in an L-shaped cross section
Water droplets are prevented from directly entering the upper portions of 1 , 61 , 62 and 62 , and the reservoirs 19 ₁ and 19 ₂ and the damper 2 are prevented.
4 _1, intrusion of water into the 24 ₂ is further reliably prevented.

Although the embodiments of the present invention have been described in detail above, the present invention can be modified in various ways without departing from the scope of the invention.

For example, the waterproof structure of the present invention can be applied to any hydraulic equipment other than the antilock brake device.

[0038]

As described above, according to the invention described in claim 1, the water flowing into the space between the housing and the cover is discharged from the plurality of drainage channels at the lower part of the space to the flap at the lower edge of the cover.
Through the gap between the top and the housing bottom surface of the flange portion can be quickly discharged to the outside <br/> unit, yet the gap and double
By forming the maze with several drainage channels, it is possible to prevent water splashing from below from entering the space between the housing and the cover and improve the waterproofness of the reservoir and the damper.

According to the invention described in claim 2,
The vertical contact surface separating the space facing the reservoir and the space facing the damper allows the water flowing into both spaces to be guided and quickly discharged from the discharge passage. Even when the reservoir breathes, water and dust are not sucked from the space facing the damper into the space facing the reservoir.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of a vehicle anti-lock brake control device.

FIG. 2 is a partially cutaway side view of the anti-lock brake device (a sectional view taken along line 2-2 of FIG. 4).

FIG. 3 is a partially cutaway side view of the anti-lock brake device (a sectional view taken along line 3-3 of FIG. 4).

4 is a view taken along the line 4-4 of FIG.

5 is an enlarged view of part 5 of FIG.

[Explanation of symbols]

19 ₁ reservoir 19 ₂ reservoir 24 ₁ damper 24 ₂ damper 31 housing 32 cover 32 ₄ side contact surface (contact surface) 32 ₅ center rib (contact surface) 32 ₆ side rib (contact surface) 32 ₇ lower contact Surface (contact surface) 32 ₈ Flange portion 46 Plug member 53 Plug member 61 Space 62 Space 63 First drainage channel (drainage channel) 64 Second drainage channel (drainage channel) 65 Third drainage channel (drainage channel)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F15B 1/06 B60T 17/06

Claims (2)

(57) [Claims] 1. Reservoirs (19 ₁ , 19 ₂ ) and dampers (24 ₁ , 24 ₂ ) facing the side surface of the housing (31)
The openings (41 ₁ , 51 ₁ ) of the plug are closed by plug members (46, 53), and the outside of the plug members (46, 53) is fixed by a cover (32) connected to the side surface of the housing (31). in the hydraulic control apparatus Tsu covered by exist a space (61, 62), a plurality of abutment surfaces formed on the cover (32) (32 _4-32
7) is brought into contact with the side surface of the housing (31), the air
The lower portion of between (61 and 62), the abutment surface of the plurality of (32 ₄ -
32 ₇ ) separated from each other and the space (61, 6)
2) The drainage channels (63, 64,
65), and the lower edge of the cover (32) is attached to the lower surface of the housing (31).
A plurality of drainage channels are formed between the upper surface of the flange portion (32 ₈ ) and the lower surface of the housing (31) while forming a flange portion (32 ₈ ) by bending in the horizontal direction.
A waterproof structure in a hydraulic control device, characterized in that a gap for communicating (63, 64, 65) with the atmosphere is formed . 2. A space (61) facing the reservoirs (19 ₁ , 19 ₂ ) and a space (6) facing the dampers (24 ₁ , 24 ₂ ).
2. The waterproof structure for a hydraulic control device according to claim 1, characterized in that (2) and (2) are partitioned by the abutment surface (32 ₆ ) extending in the vertical direction.