JPS5950845A - Brake hydraulic pressure control device for vehicle - Google Patents

Abstract

PURPOSE:To carry out control of brake hydraulic pressure in a high degree of safety, by urging valve members with the use of both air spring which determines the intitial pressures of pressure reducing operation of pressure reducing valves in accordance with a loaded weight of a vehicle, and mechanical spring. CONSTITUTION:Pressure reducing valves 51, 52 for proportionally reducing outlet hydraulic pressures at the outlet ports P1, P2 of a master cylinder M and for transmitting the thus reduced hydraulic pressures to rear wheel brakes Br1, Br2, are disposed in oil passages L1, L2 communicating between the outlet ports P1, P2 and the rear wheel brakes Br1, Br2, and the initial pressures of pressure reducing operation of the pressure reducing valves P1, P2 are determined in accordance with a loaded weight of a vehicle. An air spring in a suspension system and a mechanical spring 16 which also determines the initial pressures of pressure reducing operation of the pressure reducing valves upon a failure of the air spring system, are coupled to valve members 9 so that the valve members 9 are urged in the valve opening direction. Thereby, an ideal control of brake hydraulic pressure may be obtained, and even if the air spring system fails, hydraulic pressure to the rear wheel brakes may be reduced by determining the initial pressures of pressure reducing operation by means of the mechanical spring so that the locking phenomenon of the rear wheels may surely be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a brake oil L1-damping device 1' in a vehicle.
i', in particular, the output hydraulic pressure of the output boat is transmitted proportionally to the entire rear wheel brake to the oil passage connecting the output boat of the master cylinder cylinder and the rear wheel player. This invention relates to a device that prevents the "J-tsuk phenomenon" of the rear wheels caused by a reduction in the number of rear wheel carts due to braking by interposing a pressure reducing valve therein.

In order to make the braking of the vehicle approximate to the ideal braking, the pressure reducing valve is reduced L [-action start pressure Changes can be made, for example, the decrease in decompression that occurs when stacking is 1 day'1.J.
11 starting pressure must be higher than in each empty car 11.5-.

Conventionally, the start time of the pressure reducing action of the pressure reducing valve is determined by the nut load of the spring, so the pressure is always constant.
The J-Ti force'fc cannot be changed depending on the loaded weight.

In view of the above, the present invention Q utilizes the air spring used in the suspension system to adjust the pressure at which the pressure reducing valve starts to reduce the pressure when the vehicle is loaded (
In the event of a failure in the air splash system, the pressure at which the pressure reducing valve starts reducing is determined by the manufacturer's 2) spring, ensuring safety. It is an object of the present invention to provide the brake hydraulic control device which is adapted to the above-mentioned configuration.

Below, I will explain 11 examples of two system configurations of the device of the present invention with reference to the drawings. First, in Fig. 1, M)
Well-known tandeno operated in reverse by brake pedal 1,
Type master ring, B'l, "2 is saw, right front wheel brake, Bγl+ Br2 is left.

The right rear brake is shown. Also, 2(l-J:
It is a valve surface that is attached to the appropriate place on the car body (not shown in the figure), and 1
++1 II (Second is the first and second IJ3., 32 connected to the first and second output boats P, P2 of the master cylinder M via the oil path 1.L2, respectively, and the oil path L+
rl L2 "'ff: the first and second connected to the left and right rear wheel brakes "1 + B'2 through
11f[]4. , 42 are open 1-1, and the communication between the 1st population 31, 211j I-J 42 and the 2nd population 1132, 211j I-J 42 is the same. 11 first and second pressure reducing valves5. ．． 5
2 are provided in parallel in the upper Ta2jr box 2. Left and right front wheel brakes B1. .

r3 r2i11+route L2. L, J: Ri branch-J
-ru oil passages 1, 2 r.

Ti,'.

The first pressure reducing valve 51 is connected to the first pressure reducing valve 3. and No. 111104
1, an input hydraulic chamber 6 and an output hydraulic chamber 7, which communicate with each other.
and an elastic valve seat 8 made of rubber or the like installed between the pressure chambers 6 and 7 on both sides, and working together with the valve seat 8 to communicate and shut off the two hydraulic chambers 6 and 7. It is composed of a valve body 9.

The valve element 9 has a piston-like valve part 9 that cooperates with the valve member 9 and a guide protruding from its outer end, at the tip of a valve rod 9a that passes through the valve hole of the valve seat 8 and the input hydraulic chamber 6. Since the protruding shaft 9c is integrally formed, the base of the valve rod 9a is disposed at the outer end 7 of the input hydraulic pressure chamber 6, and the protrusion 19c is loosely fitted into the small diameter hole 12 of the output hydraulic chamber 7. A coil spring 13 that holds the valve seat 8 and the knob member 11 is compressed between the valve seat 8 and the seal portion 4A11.

The second reduction +, l, valve 52 is connected to the output hydraulic chamber (i, 7 to the second person 1,132, second +'r r] 42, respectively). : It has the same structure as the first pressure reducing valve 51, and the part VC corresponding to the first pressure reducing valve 5 in the front part is the same No. 91.

In the single valve P box 2, there is a large diameter lever adjacent to the manual oil chambers 6, 6 of the first and second pressure reducing valves 51 and 52.
W part 11, a medium-diameter spring housing part 141 that communicates with it and is located outside of it; and a small-diameter spring housing part 14 that communicates with part 1 and is located outside of it 1411.
The housing 14 consisting of C is fixed by the bolt II.15. Inside the lever housing fφ portion 14;
A circular balancing lever 18 is accommodated bridging between the ends of a. A piston 19 is slidably fitted inside the twisted/cylinder section 14C, and a power chamber 20 is defined between its outer end and the inner wall surface of the twisted cylinder section 14C.
t'' on the Ai surface, a protrusion 19 with a hemispherical tip ψ1111
A is provided protrudingly, and its distal end faces the four hemispherical surfaces 18X+ formed at the center of the 15F balancing lever 18. Furthermore, an IT mechanical spring (in the illustrated example, a coil spring 16) is housed in the spring housing part 141), and both ends of the coil spring 16 are brought into contact with the four parts 1B+) of the balance lever 18 and the piston 19, respectively. In between, the prescribed seven loads Fr! ,? ! ? It will be shortened.

Pressure chamber 20 VC, suspension system 4? and the air chamber 23 of the air spring 22 which is a component of the air spring type vehicle height adjustment mechanism 21.
is connected. The vehicle height adjustment mechanism 21 i, J, air 1
a pressure storage tank 25 for storing compressed air, an air spring 22, and a control valve 26 that can introduce compressed air from the storage link 25 into the air chamber 23 of the air spring 22 and discharge it therefrom. and a coil spring 27. Nil spring 27 is only for the air tank heavy sleeves. There are four air springs 22 that share the load ff Ii. That is, compressed air regulated by the control valve 26 according to the loaded vehicle M is introduced into the air chamber 23 of the air chamber 2, thereby keeping the vehicle height constant, and therefore the loaded weight is heavy. For example, if the pressure inside the air chamber 23 is high and the load is light, the pressure inside the air chamber 23 will be low.

A pressure J corresponding to the loading area is introduced into the pressure chamber 20 of the cylinder portion 14C after the car is empty, and this causes the piston 19
is the coil spring 16 jll! As shown in the figure, the tip of the protrusion 13M+ slides to the left.
Both valve bodies 9, 9 collide with the concave surface 1821 of the V balance lever 18.
Since both valve bodies 9°9 are slid in the same direction, each valve part 91)
are held at IN at a distance from the valve seat 8.

28 is an orifice formed in the outer end wall of the cylinder portion 14C, which attenuates pulsations in the pressure on the air spring 22 side and prevents sudden fluctuations in the pressure within the pressure chamber 20 of the cylinder portion 14C. It is something to do.

Next, to explain the operation of this embodiment, while driving on a medium-sized vehicle, press the brake pedal 1 and operate the mask cylinder M with X7.
Its first and second output ports p,.

When hydraulic pressure is output from P2, the output hydraulic pressure of the first output boat P1 passes through oil path L+ + L1' to the right front wheel brake B.
r2, the human power hydraulic pressure chamber 6 of the first pressure reducing valve 51 and the output hydraulic pressure chamber 7 communicating therewith are transmitted to the left rear wheel brake B r through the oil passage I', respectively. Fully operational. - Output oil of Tsuba 2nd output boat P2) L
is oil road 3. After passing through L2r, left front wheel brake B is applied.
Also, from the input hydraulic pressure chamber 6 of the second pressure reducing valve 52,
The positive output hydraulic pressure chamber 7 and oil passage L2r are transmitted to the right rear wheel brake Br2 in seconds, respectively, and the brakes are operated.

And Mask'n Ring M's 1st. 2nd output boat PI
s "When the output oil pressure of 2 becomes -1- or more than the predetermined value" -4, the 1st. The second pressure reducing valve 5□, 52 is one rear wheel brake port++
This starts to control the hydraulic pressure of 2, and its operation will be explained in detail next.

First, when the output oil pressure of the first output boat P1 reaches a predetermined value, the first pressure reduction: ff' 5 by yl of the output oil pressure of the first output boat P1.When the oil pressure in the output oil pressure chamber 6.7 reaches a predetermined value, Rightward pressing force (of valve rod 9a), 1, section section 4'+'
It corresponds to iA multiplied by the human pressure and the hydraulic pressure of the output hydraulic chambers 6 and 7. ) is pushed against the biasing force exerted on the valve body 9 by the air pressure of the air spring 22 introduced into the pressure chamber 20, causing the body 9 to move to the right in the figure. and seat the valve part 91) on the valve seat 8.

Communication between the output hydraulic chambers 6 and 7 is cut off. After that, the output oil pressure of the first output port p is -1-, +11. Pushing the valve body 9 to the left due to the oil j in the input hydraulic chamber 6 1:
The force (approximately equivalent to the difference between the cross-sectional area B of the valve portion 91 and the cross-sectional area A multiplied by the hydraulic pressure in the human hydraulic pressure chamber 6) is ↓ the hydraulic pressure in the output hydraulic chamber 7. The pressure force (approximately equivalent to the cross-sectional area B multiplied by the hydraulic pressure of the output hydraulic chamber 7) in the rightward direction is used to push the body 9 back toward 1° and the valve part gb'ff: Since the pressure chambers 6 and 7 are separated from the valve seat 8 and communicated again between the side pressure chambers 6 and 7, the pressure in the output hydraulic chambers 7 is increased. Increase and move P-body 9 to the right by 11/
1I11t: The connection between chambers 6 and 7 is cut off, and the same operation is repeated as the output oil pressure of the first output boat P increases, and as a result, the output of the first output port p The hydraulic pressure can be proportionally reduced and transmitted to the left rear wheel brake Br1.

In this case, decrease 1■-valve 5. The pressure at which the decompression action starts is determined by the cross-sectional area A and the air chamber pressure of the air spring 22.
The air chamber pressure is the load of the vehicle @! Since it changes according to i, the braking can be approximated to ideal braking. The pressure reduction ratio is approximately determined by the ratio of the cross-sectional area (B-A) and the cross-sectional area A.

-The output oil pressure of Tsuba second output boat P2 exceeds the predetermined value.”
- In other words, the second pressure reducing valve 52 operates in the same manner as the first pressure reducing valve 5, and proportionally reduces and transmits the output oil pressure to the right rear wheel brake Br2.

By the way, both pressure reducing valves 5. , 52, each block "body 9,
There is generally a slight error in the operating timing of 9 and the operating stroke, and depending on these errors, the balance lever to 1.
3 is the protrusion 19 of the piston 19; tilting 1 using the 1 as a fulcrum;
The pressure in the 11-chamber 20 of the cylinder portion 14C can always be equally distributed to both the valve bodies 9, 9, and as a result, the pressures at which the pressure reducing action of both the pressure reducing valves 51, 5□ start are reliably balanced.

On the other hand, if a failure such as air leakage occurs in the air spring 22 system, pressure will no longer act on the pressure chamber 20 of the cylinder portion 14C, so the elastic force of the coil spring 16 will cause the air leakage.
- The cylinder 19 slides in the 7°f direction and collides with the wall of the pressure chamber.

In this state, the elastic force of the coil spring 16 causes the valve bodies 9, 9 of both pressure reducing valves 51 + 52 to slide to the left, so that each valve part 91) is held at a position separated from the seat 8. During braking, the oil pressure in the output hydraulic chamber 7 is 7.
When the 9r constant value is reached, the pushing force L7E acting on the valve bodies 9, 9 to the right in the figure overcomes the force of 1/2 of the set load of the coil spring 16, and the valve bodies 9, 9 move to the right in the figure. Move each valve part 9
1) Place the valve seat 8 on the fq-valve seat 8 and press the first valve as described above.
The output hydraulic pressure of the second output capo door +P2 can be proportionally reduced and transmitted to the left and right rear wheel brakes nr, , B+"2. In this case, the load of the coil generator 16 is set low. Although this reduces the pressure required to start the depressurizing action, it is safe because it reliably prevents the rear wheels from locking.

As described above, according to the present invention, the output hydraulic pressure of the output boat is reduced proportionally to the rear wheel brake by using an oil path that connects between the output boat of the master cylinder and the rear wheel brake.
The air spring of the suspension system is equipped with a pressure reducing valve that obtains transmission 1~, and the pressure at which the pressure reducing valve starts its pressure reducing action is determined depending on the loading type of the vehicle, and the pressure reducing valve is reduced when the air spring fails. The mechanical spring that determines the starting pressure is used as the valve body.
L71 open jp lJ direction t (= connected so as to energize (~), so the braking can be approximated to the ideal 1li111+71. Even if a failure occurs in the air spring system, the mechanical system will not be able to reduce the pressure. The application start pressure can be determined and applied to the rear wheel brake (/III J, iE <reduction 11g), thereby reliably preventing the rear wheel from slipping, which is safe.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. Drl, Br2...Left, right rear wheel brake, LI +
'4H■7,' + LI" * "2' + L2
'...Oil path, M master cylinder, '11P2...
1st. 2nd output capo]・,5,. 52... 1st. 2nd pressure reducing valve, 9 Machii body, 16... mechanical spring L, coil spring, 22... air spring. Patent applicant Nissin Kogyo Co., Ltd. r1- Agent Patent attorney Mr. Ochiai, Commissioner of the Korean Patent Office 1. Indication of the case 1982 Patent Application No. 151622 3, Relationship to the case of the person who made the sleeve jl 2 Patent applicant name Nissin Kogyo Co., Ltd. 4, agent 〒105 5 Contents of the amendment subject to the amendment (1) Details Skin patent' [Claims are amended as stated in 1. A pressure reducing valve capable of proportionally reducing and transmitting the output hydraulic pressure of the output boat to the rear wheel brake is interposed in the oil passage connecting between the output boat of the mask cylinder and the rear wheel brake,
The air spring of the suspension system, which determines the pressure at which the pressure reducing valve starts reducing pressure according to the loaded weight of the vehicle, and the mechanical spring, which determines the pressure at which the pressure reducing action starts when the air spring fails, are reduced in pressure. A vehicle brake hydraulic control device that is connected to a valve so as to bias it in the valve opening direction. (2) Page 3 of the detailed description, lines to to 11, ...[
First, in Figure 1, delete the text ``...''. (3) Specification page 11, No. 9. Line 10, ``
It says "air chamber pressure"......1 air pressure"...I correct it. (4) Page 14, line 1 of the specification, it says...[valve body]...
・[Pressure reducing valve-1... Corrected. (5) Page 14, line 13 of the specification, ``...19...valve body,''... shall be deleted. that's all

Claims (1)

[Claims] The output oil of the output boat is connected to the oil passage connecting between the output boat of the mask cylinder and the rear wheel brake.
The air valve of the suspension system is equipped with a pressure reducing valve which proportionally reduces the pressure and transmits it to the rear wheel brake, and the pressure at which the pressure reducing action of the pressure reducing valve starts is determined according to the loaded weight of the vehicle. , a mechanical spring that determines the pressure at which the pressure reducing action of the pressure reducing valve starts when the air spring fails is connected to a +'+iJ valve body so as to exert a small force in the valve opening direction. Brake hydraulic side leg system.