JPS59109451A - Deceleration sensing type hydraulic controller for brake for car - Google Patents

Abstract

PURPOSE:To facilitate air venting from a sealing-liquid chamber by forming a bypass passage in an inertia valve for controlling the pressure in the sealing- liquid chamber and closing the bypass passage by an air bleeder. CONSTITUTION:An inertia valve 5 controls the liquid pressure in a sealing liquid chamber (d) and is bypassed by a bypass passage 31. In said passage, an air bleeder 6 is installed, and closes the passage by the contact of a conical part 28c at the top edge of a bolt 28 onto seat surface 27c, and when a small-diameter part 28b is departed from an O-ring 30, said small-diameter part communicates to the outside through an air flow passage 29 to permit air venting. Since the inertia valve is bypassed during air venting work, closure of the inertia valve due to liquid flow can be prevented, and rapid work is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a deceleration sensing type hydraulic pressure control device for a vehicle brake system, and particularly to an air venting mechanism thereof.

Conventionally, it has been well known that vehicle braking force needs to be reduced by a predetermined ratio on the rear wheels compared to the front wheels due to the difference in the pressing force of the front and rear wheels against the road surface during braking. It is also known that this pressing force also changes in response to changes in the loading state of the vehicle.

Therefore, in response to such changes, various measures have been taken to prevent the occurrence of wheel lock by distributing the front and rear wheel brake forces as ideally as possible. A proportioning type hydraulic pressure control valve that controls rear wheel brake fluid pressure at a turning point by adjusting the hydraulic force between pistons with different areas and the spring that applies spring force to the pistons, and the setting of the spring force. When the deceleration during braking of the vehicle reaches a certain value, the communication to the sealing fluid chamber is cut off, and the spring is compressed to a state corresponding to the sealed fluid pressure value, and the corner point - There has been provided a device that also includes an inertia valve that allows the starting point of pressure reduction control to be varied in accordance with the amplification of the spring force.

This type of hydraulic control device is designed to reduce the braking force required to achieve a constant deceleration as the vehicle is loaded.
Since the brake force increases in a proportional relationship, it is possible to obtain control characteristics that approximate the ideal distribution of front and rear brake force.

However, in such a device, the path of the hydraulic thread is complicated, and on the other hand, as a hydraulic system, it is difficult to ensure air removal after assembly.
It goes without saying that this must be done perfectly,
Therefore, conventionally, an air bleeder (hereinafter referred to as an air bleeder) for the main brake fluid transmission system and an air bleeder facing the sealing fluid chamber have been provided separately.

In the past, the air venting operation of Shishi-Shiko could not be described as simple. Fit] When venting air, hydraulic pressure is applied to the main brake fluid transmission system, and the air leader facing the sealing fluid chamber is opened to vent air from the same chamber.
In this case, when the air leader is opened, the fluid pressure in the sealing fluid chamber disappears, causing a rapid flow of fluid from the main brake fluid transmission system to the sealing fluid chamber through the inertia valve. This may lead to the inertial ball hitting the valve seat.

Once the inertia goal hits the valve seat, the inertia will be reduced by the hydraulic action. - This is because the sealing state between the valve and the valve seat continues, making it impossible to vent air sufficiently from the sealing liquid chamber.

To prevent such problems and completely bleed the sealing liquid chamber, gradually increase the time while applying a low hydraulic pressure that breaks the inertia to avoid the liquid flow hitting the valve seat. It is necessary to devise measures such as venting the air over the brake fluid, or providing a pinhole passage that connects the main brake fluid transmission system and the sealing fluid chamber.

However, it takes time to perform the work while applying extremely low hydraulic pressure, and there are problems in that it is difficult to ensure completeness.On the other hand, if a bypass path is provided, this bypass path should be closed during normal use of the equipment. Therefore, this opening
There is also the drawback that configuration and operation are required for closed switching.

Therefore, in the present invention, the object is to be used in the brake system, which requires extremely high device reliability, so there is almost no risk of mishandling during operation, etc., and it can be done easily. certainty·
To provide a deceleration-sensing hydraulic pressure control device that can completely bleed air and, moreover, can reliably exhibit its original function and function after the air is bleed.

The gist of the present invention is to control rear wheel brake hydraulic pressure at a turning point by a turning point spring and a hydraulic force acting on the hydraulic pressure path from the mask cylinder to the rear wheel brake device. a proportioning type valve device; a spring force adjustment mechanism that compresses the corner spring according to a hydraulic pressure value of a sealing liquid chamber connected to the hydraulic pressure path; A deceleration sensing type hydraulic pressure control device for a vehicle brake system comprising an inertia valve device disposed at a connection portion and closing a normally open path when deceleration during vehicle braking exceeds a certain value. A bypass communication passage that bypasses the inertial valve device is provided between the chamber and the hydraulic path, and an air bleeder for venting air to the outside is provided at the connection part of this bypass communication passage to the sealing liquid chamber. A vehicle characterized in that the bypass communication passage is closed when the bolt is tightened, the bypass communication passage is opened when the delt is loosened, and the air vent passage is opened at the same time as or after the opening. It is in the brake line deceleration sensing type hydraulic pressure control device.

The embodiments of the present invention will be described below based on the drawings.The embodiments shown below are those in which the present invention is applied to a deceleration-sensing hydraulic pressure control device for one system, but this is a second embodiment. Needless to say, it can be used for heavy piping.

Embodiment 1 In Fig. 1, 1.2 is a valve device that incorporates each component of a hydraulic pressure control device by integrating them through combination fastening and mounting, and 3 is a slow-portioning type valve device. , 4 is the bending point f IJ song spring force adjustment mechanism, 5
Reference numeral 6 indicates an inertial valve device, and 6 indicates a leader for opening/closing a communication path between the sealing liquid chamber d and the pole accommodation chamber of the inertial valve device, as well as venting air. The configuration of the bleeder 6 is distinctive, and therefore the configurations of the proportioning type valve device 3, spring force adjustment mechanism 4, and inertia valve device 5 are the same in each embodiment described below.

Now, is the Gro-portioning type pulp device 3 Pal 2?
A through cylinder 8 is provided in the middle cylinder member 7 which is fixedly assembled in the day 2 by a locking ring 9, and a control piston 10 whose one end is inserted through the through cylinder 8 is connected to a valve body 11 at the other end. In cooperation with the valve seat 12 that divides the interior of the chamber into input and output liquid chambers a and b, the liquid pressure in the output liquid chamber is controlled to be reduced at a turning point. 13 is a hold spring for the valve seat 12, 14 is a piston cup,
15 is a port that connects the input liquid chamber a to a mask cylinder (not shown), and 16 is a passage that connects the output liquid chamber a to the rear wheel brake device (not shown) via the inertia valve device 5 and port 17. be. The spring force of a corner spring 18 is applied via a spring seat 19 to one end of the control piston 10 inserted through the cylinder member 7, and this spring force sets the hydraulic pressure corner value when the valve device is operated. It is determined.

The operation of this more provoking type pulp device is known, and the liquid pressure transmitted from the mask cylinder to the input liquid chamber a is transmitted as it is through the output liquid chamber A until a predetermined break point value. After a predetermined turning point value transmitted to the wheel brake device and determined by the spring force of the turning point spring 18 and the hydraulic pressure acting force, the output hydraulic pressure is controlled to be reduced with respect to the input hydraulic pressure.

The spring force adjustment mechanism 4 has one end facing the sealing liquid chamber d, and the other end facing the corner spring 1BVC via the spring seat 20.
an engaging adjustment piston is slidably fitted to the adjustment cylinder 22;
The adjusting piston 21 is provided to compress the corner spring 18 when the liquid pressure in the sealing liquid chamber d becomes high;
This makes it possible to variably increase the break point value of the zolo-portioning type valve device. 23 is a piston cup.

Is the inertial valve device 5? The guide surface 24 of the wheel storage chamber C has no elevation angle θ with respect to the vehicle traveling direction (indicated by the arrow in the figure), and the sole 25 has a constant deceleration g when the vehicle is braked. By sitting on seat 26 when the
The sealing liquid chamber d is provided so as to close the communication path between the sealing liquid chamber C and the sealing liquid chamber d.

Due to such an inertial valve device 5, the deceleration that occurs when braking a vehicle is inversely proportional to the load carrying capacity of the vehicle, so as the load carrying capacity increases, a large brake brake hydraulic pressure is required. , the sealing hydraulic pressure increases by that amount, and the corner value becomes larger, thereby achieving desirable brake hydraulic pressure control.

Now, in order to bleed air from the sealing liquid chamber d in a hydraulic pressure control device having a relatively complicated hydraulic system as described above, an air leader for air bleed is provided facing the sealing liquid chamber d. 6 is a feature of the present invention. This point will be described below. The air leader 6 has a bolt hole 27 formed so as to face the sealing liquid chamber d from the outside of the valve seat 1.
It consists of a large-diameter screw hole 27a on the outside, a cylinder part 27b following this, and a sheet 27c that engages the bolt tip surface in a liquid-tight manner, and a part of the cylinder part 27b includes A bypass communication passage 31 connected to the sol storage chamber C of the inertial valve device 5 is opened. The leader bolt 28 has a conical end portion 28c that engages with the seat 27c of the bolt hole, a small diameter portion 28b that slides into the cylinder portion 27b, and a threaded portion 28a that engages with the large diameter screw hole 27aK.
and a threaded portion 28a and a small diameter portion 28.
In the stepped portion b, an air flow passage 29 to the outside is provided which opens in a gap between the bolt hole 27 and the stepped portion. 30
is an O-ring that snaps onto the outer periphery of the small diameter portion 28b of the bleeder bolt 28 to create a fluid-tight seal between the airflow passage 31 and the airflow passage 290 of the bleeder bolt.

In the air bleeder 6 having such a structure, when the bleeder bolt 28 is sufficiently tightened, the conical end portion 2 of the bleeder bolt 28
8c rests on the seat surface 27c of the bolt hole 27, so the bypass communication passage 31 is closed, and communication between the pole storage chamber C and the sealing liquid chamber d is established via this bypass communication passage 31. is blocked. Therefore, the sole 25 of the inertial valve device 5 establishes communication and isolation between these two chambers e and d.

Further, since the O-ring 30 is attached to the outer periphery of the small diameter 1ll (28b) of the leader bolt 28, the brake fluid does not leak to the outside.

Next, when the bleeder bolt 28 is loosened, its tip circular erosion part 28c separates from the seat surface 27c. - Le containment room C
and the sealing liquid chamber d are communicated via a bypass communication path 31. Then, when the bleeder bolt 28 is loosened, its small diameter 528b comes off from the cylinder part 27b of the bolt hole 27, and the seal by the O-ring 30 is released and the sealing liquid chamber d1 bypass communication passage 31 connects the air liquid passage 29. It is communicated with the outside through F9, and it is possible to carry out regular air purge work.

After that, by tightening the bleeder bolt 28, the state is returned to the state where the sealing liquid chamber d and the goal storage chamber C are cut off from the outside and the sealing liquid chamber d and the goal storage chamber C are cut off.

Next, as other embodiments of the present invention, Examples 2 to 7 206
The O-ring 230 to be assembled into the bolt hole 227 of the plug 2 is screwed and fixed to the lower end of the large diameter screw part 227a.
32, and other points have the same structure.

This configuration has the advantage that the O-ring 2300 can be easily assembled and replaced in case of damage.

Embodiment 3 As shown in FIG. 3, the features of this embodiment are as follows:
The piston cup 332 is used to provide a liquid-tight seal between the air flow passage 329 and the bypass communication passage 331.

That is, a piston cup (one-way sealing member) 332 that only allows fluid leakage to the outside is installed between the threaded portion 327a of the bolt hole 327 and the opening of the pass communication passage 331, and the 328 is fitted with a ring 333 having a circumferential protrusion that fits into a recess between the inner and outer lips of this piston cup 332, and the protrusion of this ring 333 fits into the recess of the piston cup 332. The one-way sealing property is suppressed, and the ring 333 is disengaged from the piston cup 332 by tightening the bleeder bolt 328, and released from the engagement by loosening the bleeder bolt 328. That's what I do.

The effect obtained by such a configuration is as described in Example 1 above.
, 2.

Embodiment 4 What are the characteristics of this embodiment shown in FIG. 4 compared to the case of Embodiment 1?
The cylinder portions 427b, 427b' of the seat hole 427 and the small diameter portions 428b, 428b' of the leader bolt 428 are slidably engaged with each other in two stepped steps, and each of these stepped mating surfaces is provided with an O-ring 330, 330' is interposed to provide a liquid-tight seal.

The operation of the structure thus constructed is basically the same as that of the first embodiment, but in this embodiment, the liquid-tight seals are provided in two stages, so that the following effects can be obtained.

That is, the O-rings 430, 430' are subjected to hydraulic action when releasing the liquid-tight seal, and the O-rings 430, 430'
b, it deforms when it comes off from 427', and due to this deformation, it is bitten by the stepped part on the cylinder side, and there is a tear. Therefore, for example, if the liquid-tight seal of the Q IJ song 30 is released before the 0-ring 430', the risk of a liquid-tight seal failure due to these 0-rings is greatly reduced. That's what happens.

Embodiment 5 The feature of this embodiment shown in FIG.
This is accomplished by fitting the A'-plane of the pulley bolt to the seat surface of the delt hole, without using an O-ring.

That is, the leader bolt of this example is configured by a combination of a second member 528 that is screwed into a seat hole 527, and a first member 528' in which an air flow passage 529 is formed.
The seat surface 52 of the delt hole 527 is attached to this second member 528'.
7c', which forms a tapered surface 528c' that engages with the first member 528'. , bypass communication path 5
31 and the air flow passage 529.

In addition, in this example, the combination of the first member and the second member produces a breeder. - Two seat surfaces 527c constitute the constituent members.

527 e' and a tip conical portion 528 that engages with this.
c.

This is because it is difficult to manufacture the dimensional relationship with Qi 528c' without error.

Therefore, in this example, the second member 528' is first sufficiently tightened into the serration hole 527 to engage the cheek surface 528c' with the seat surface 527c', and the second member 528' in this state is
'A #51 member 528 is screwed into the tip of the conical part 52.
8c is engaged with the seat surface 527c, and after this, the air venting operation is performed only by turning the screw of the second member 528'. In the case of this example, the υ1 plug of the bypass communication passage 531 and the air flow passage are opened simultaneously by loosening the leader bolt. It turns out.

Embodiment 6 The feature of this embodiment shown in FIG. 6 is that a spring suppressing type UH closing valve is provided at the tip of the Prida del Toro 28 to release the liquid-tight seal by loosening the bolt 628.

That is, the tip of the leader bolt 628 is provided with a tapered surface 628c that blocks communication between the sealing liquid chamber d and the bypass communication path 631 by engaging with the seat surface 627c. 631 and screw hole 627a
0 to the ring 630), and furthermore, at the tip thereof, the seat surface 635 of the blind hole 634 of the pulp dedi 601 is sealed by the spring force of the hold suge ring 633.
A valve body 636 that engages with is assembled.

This valve body 636 closes between the sealing liquid chamber d and the air flow passage 629 when engaged with the seat surface 635, and when the loosening of the bleeder del toro 28 reaches a certain amount, the valve body 636 closes the gap between the sealing liquid chamber d and the air flow passage 629. 28 and is provided so as to be spaced apart from the seat surface 635, thereby allowing the sealing liquid chamber d to communicate with the outside. In addition, 637
is an axial vertical hole flow passage of the valve body 636, and 638 is an O-ring.

Example 7 What are the characteristics of this example shown in Figure 7? The plug screwed into the seat hole 727 establishes communication between the sealing liquid chamber d and the bypass communication passage 731 by tightening and loosening the plug, and the conical tip portion 727
The plug 728 is a member that opens and closes by engaging and separating the seat surface 727c and the seat surface 727c, and a pleader bolt 733 having an air flow passage 729 is incorporated into the plug 728.

That is, the plug 728 is provided with a liquid chamber e in the shaft, which is communicated with the bypass communication passage 731 via the passage 734, and furthermore, the leader bolt 733 facing the liquid chamber e is assembled so as to be pushable. The leader bolt 733 is normally locked in an outwardly projecting position by a hold spring 735. 736 is a locking ring. And the plug cylinder 737 of this leader bolt 733
A sealing member (a piston cup in the figure) is interposed on the sliding surface of the slider, and this sealing member 738 releases the liquid cylinder seal by pushing the leader (rut 733) into the liquid chamber e. is provided so that it can communicate with the outside via an airflow passage 729.

According to such a configuration, after opening the communication between the bypass communication passage 731 and the sealing liquid chamber d, air can be vented by pressing the Prieder door 33 arbitrarily.

As described above, the deceleration sensing type hydraulic pressure lever 1 according to the present invention
With this control device, air removal work can be performed relatively easily and reliably, and since there is essentially only one component to be tightened and loosened, there is no problem of forgetting to tighten. Its usefulness is extremely great.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional view of the hydraulic pressure control device of Embodiment 1, and FIGS. It is a partially sectional view. 1.2: Pulve Dedy 3: Zorro Portioning Type Valve Device 4: Spring Force Adjuster S 5: Inertia Valve Device 6: Air Bleeder 7: Middle Cylinder Member 8: Penetrating Cylinder
9: Locking ring 10: Control piston 11: Valve body 12: Valve seat 13; Hold spring 14: Piston cutter 15, 17: Port】6
: Passage 18: Corner spring 19, 2
0 Spring seat 21: Adjustment hist:' 22: Adjustment cylinder 2
3: Piston cutter f 24 Nigite 9 side 25: Ball 26: Seat 27: Pol)/hole
28 Nibreda Porto 29: Air flow yjfl path
30:0-)), f31: Bypass communication path 232
Nib lug 332: Piston cup f333: Ring 533
: Passage 534 : O-ring 633 :
Hold spring 634: Blind hole 635: Seat surface 636:
Valve body 637; Vertical hole R path 638: O-ring 727: Plug 733 Nibbler bolt 7
34: Flow path 735: Hold spring 736: Locking ring 737: f lug cylinder 738: Seal member 4th
Figure 6 Figure 7

Claims (1)

[Claims] a proportioning-type pulp device that is interposed in the hydraulic pressure path from the master cylinder to the rear wheel brake device and controls the rear wheel brake hydraulic pressure to be reduced at the corner point by balancing the corner point sagging and the hydraulic pressure action; a spring adjustment mechanism for compressing the corner spring according to a hydraulic pressure value of a sealing liquid chamber connected to the hydraulic pressure path; and a spring adjustment mechanism disposed at a connecting portion between the hydraulic pressure path and the sealing liquid chamber; In a deceleration-sensing hydraulic pressure control device for a vehicle brake system, which includes an inertia valve device that closes a normally open path when deceleration during vehicle braking exceeds a certain value, there is provided a fluid pressure control device between the sealing fluid chamber and the fluid pressure path. A bypass communication passage that bypasses the inertial valve device is provided, and an air bleeder for venting air to the outside is provided at the connection part of this bypass communication passage to the sealing liquid chamber. A deceleration-sensing liquid for a vehicle brake system, characterized in that it is configured to close the bypass passage, open the bypass communication passage when the bolt is loosened, and open the air vent passage at the same time as or after the opening. Pressure control device.