JPH045159A - Hydraulic boosting system - Google Patents

Abstract

PURPOSE:To improve the reliability of a hydraulic boosting system by providing an operating liquid flow impeding means for impeding the flow of operating liquid on the downstream side onto the upstream side of this operating liquid flow impeding means when the pressure on the upstream side drops because of the breakage of a pipe, the looseness of a pipe connected part, or the like. CONSTITUTION:A braking liquid pressure boosting system 1 is provided with a hydraulic pump 4 for sucking operating liquid in a reservoir tank 2 through a suction passage 3 for pressurization, a braking liquid pressure booster 6 for boosting the input of the pressurized liquid supplied through a supply passage 5 by the specified times to output it, and a discharge passage 7 for discharging the operating liquid in the booster 6 to the reservoir tank 2. In this case, a check valve 11 as an operating liquid flow impeding means for allowing only the flow of the operating oil flowing from the hydraulic pump 4 toward the braking liquid pressure booster 6 is provided at a braking liquid pressure booster side passage 5b in the supply passage 5. The passage 5b is further provided with pump operation on-off pressure switches 12, 13 on the upstream side of the check valve 11, and an accumulator 14 on the downstream side of the check valve 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention enables a hydraulic pressure booster, such as a brake booster, to control input to a predetermined magnitude using pressurized hydraulic fluid from a hydraulic pressure generating means. This relates to a hydraulic boosting system that boosts output power.

(Prior Art) Hydraulic pressure boosting systems are used in various devices, such as brake boosting systems in automobile braking devices and clutch boosting systems in power transmission devices, and allow large operations to be performed by small operating forces. You can get power.

An example of such a conventional hydraulic pressure boosting system is a brake fluid pressure boosting system as shown in FIG. 3, for example. As shown in FIG. 3, this brake fluid pressure boosting system 101 includes a reservoir 102 for storing hydraulic fluid, a hydraulic pressure generating means to pressurize the hydraulic fluid in the reservoir 102 to a predetermined pressure, and a pressure accumulating means to pressurize the hydraulic fluid to a predetermined pressure. a brake fluid pressure booster 105 to which the hydraulic fluid pressurized and accumulated by the fluid pressure source 103 is supplied via a supply passage 104; and an operation within the brake fluid pressure booster 105. Drain passage 10 for draining liquid into reservoir 102
It consists of 6.

Brake fluid pressure boost system 101 configured in this way
In this case, the control valve 105b is not switched by the input from the input member 105a during operation.The pressurized hydraulic fluid is supplied to the brake fluid pressure booster 105, so that the brake fluid pressure booster 105 receives the input. The output is increased to a predetermined size. This output activates the dual mask cylinder 107 integrally attached to the brake fluid pressure booster 105 to generate brake fluid pressure, and the brake fluid pressure is applied to each wheel cylinder 108, 109, 110, 111. Introduced and played by the player.

By the way, in such a conventional brake fluid pressure boosting system 101, the supply passage 104 is generally made of a flexible material such as rubber due to the respective installation locations of the fluid pressure source 103 and the brake fluid pressure booster 105. High pressure hose 1 made of material
04a, ]04b, and 104c. In that case, a high pressure hose 104a is generally connected to the pipes 104b, +04c of the supply passage 104 by a hose connector. When designing and assembling the brake fluid pressure boosting system, it is important to use highly reliable high-pressure hoses 104a, pipes 104b, 104c, and hose connectors, and to ensure that they are connected reliably. Every care has been taken to ensure that the brake fluid pressure boost system is extremely reliable.

(Problem to be Solved by the Invention) However, even in such a highly reliable brake hydraulic system, if the high-pressure hose 104a section were to break or the screws at the connector section should become loose. , the hydraulic fluid leaks to the outside and the hydraulic pressure of the hydraulic fluid decreases, making it impossible for the brake fluid pressure booster 105 to reliably generate an output of a predetermined magnitude.

The present invention was made in view of these problems, and its purpose is to prevent any damage or loosening of screws from occurring in the plurality of pipes and pipe connections that supply hydraulic fluid to the hydraulic booster. To provide an even more reliable hydraulic pressure boosting system by reliably preventing at least the hydraulic pressure of hydraulic fluid in a hydraulic pressure boosting device from decreasing even if this occurs.

(Means for Solving the Problem) In order to solve the above-mentioned problem, the invention of claim 1 provides a supply passage for supplying the hydraulic fluid pressurized by the hydraulic pressure generating means to the hydraulic pressure booster. , is constructed by connecting a plurality of pipes, and among the plurality of pipes, a pipe connected to the hydraulic pressure booster is provided with a hydraulic fluid flow prevention means, and this hydraulic fluid flow prevention means is provided with a hydraulic fluid flow prevention means. It is characterized in that it is a means for blocking the flow of hydraulic fluid from at least the hydraulic pressure booster side toward the hydraulic pressure generating means side when pressure is lost on the upstream side.

Further, the invention according to claim 2 is characterized in that the hydraulic fluid flow blocking means is formed of a check valve that allows only the flow of the hydraulic fluid from the hydraulic pressure generating means side toward the hydraulic pressure booster side. It is said that

Furthermore, the invention according to claim 3 is characterized in that at least one of the plurality of pipes, excluding a pipe connected to the hydraulic pressure booster, is a flexible hose.

Furthermore, the invention according to claim 4 is characterized in that a pressure accumulating means is disposed in the supply passage which is open between the hydraulic fluid flow blocking means and the hydraulic pressure booster.

(Function) In the hydraulic booster system according to the present invention having such a configuration, the hydraulic fluid flow blocking means allows the hydraulic fluid to flow into the hydraulic booster at the time of pressure failure on the upstream side of the hydraulic fluid flow blocking means. Flow from the side toward the hydraulic pressure generating means side is prevented. As a result, even if the pressure on the upstream side of the hydraulic fluid flow prevention means decreases due to breakage of the pipes upstream of the hydraulic fluid flow prevention means and the connections between the pipes, loosening of screws in the pipe connections, etc. There is no possibility that the pressure on the hydraulic pressure booster side will drop. Therefore, a predetermined level of hydraulic pressure is ensured in the hydraulic booster, so that the hydraulic booster can operate reliably.

By forming the hydraulic fluid flow blocking means with a check valve, the hydraulic fluid flow blocking means can be made to have a simple structure.

By forming at least one of the plurality of pipes, excluding the pipe connected to the hydraulic pressure booster, with a flexible hose, flexibility in the installation locations of the hydraulic pressure generating means and the hydraulic pressure booster is increased. becomes larger.

Furthermore, by disposing a pressure accumulating means in the supply passage between the hydraulic fluid flow blocking means and the hydraulic fluid inlet,
Even if a drop in hydraulic pressure occurs due to breakage of the pipes and the connecting portions of the pipes, loosening of screws in the pipe connecting portions, etc., the hydraulic pressure booster can be operated reliably a predetermined number of times.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a diagram showing a case where an embodiment of the hydraulic pressure boosting system according to the present invention is applied to a brake hydraulic pressure boosting system.

As shown in FIG. 1, the brake fluid pressure boosting system 1 includes:
A reserve tank 2 that stores hydraulic fluid, a fluid that sucks the hydraulic fluid in this reserve tank 2 through a suction passage 3 and pressurizes it to a predetermined pressure, and that constitutes the hydraulic pressure generating means of the present invention in this embodiment. Pressure pump 4, the hydraulic fluid pressurized by this hydraulic pump 4 is supplied via the supply passage 5. When activated, the brake fluid pressure booster uses the hydraulic fluid to double the input to a predetermined magnitude and output it. A device 6 and a discharge passage 7 for discharging the hydraulic fluid in the brake fluid pressure booster 6 to the reserve tank 2 are provided.

The suction passage 3 is composed of three pipes, and the middle pipe is formed by a low-pressure hose 8 made of a flexible material such as rubber. This low pressure hose 8 is connected to the reserve tank 2 side and the hydraulic pump 4 side of the suction passage 3 by a hose connector (not shown).

Similarly, the supply passage 5 is composed of three pipes, and the middle pipe is formed by a high-pressure hose 9 made of a flexible material such as rubber. This high pressure hose 9 is connected to the supply passage 5
The pipe of the pump side passage 5a and the pipe of the brake fluid pressure booster side passage 5b are connected by a hose connector (not shown). A check valve 10 is provided in the pump side passage 5a to allow only the flow of hydraulic fluid from the hydraulic pump 4 toward the brake fluid pressure booster 6. Similarly, a check valve 11 is also provided in the brake fluid pressure booster side passage 5b to allow only the flow of hydraulic fluid from the hydraulic pump 4 toward the brake fluid pressure booster 6. Further, the brake fluid pressure booster side passage 5b is provided with a pressure switch 12 for turning on the pump operation and a pressure switch 13 for turning off the pump operation on the upstream side of the check valve 11. An accumulator 14 is provided on the downstream side.

Furthermore, filters 15 and 16 are provided immediately before the hydraulic pump 4 in the suction passage 3 and immediately before the brake fluid pressure booster 6 in the supply passage 5, respectively, for removing foreign matter such as dust from the hydraulic fluid.

On the other hand, a tandem type mask cylinder 17 is connected to the brake fluid pressure booster 6.
Two pressure chambers 20, 21 are formed inside by the primary piston 18 and the secondary piston 19. These pressure chambers 20.21 communicate with the brake cylinders 23, 24, 25.26 of the front wheels and the rear wheels, respectively, and also communicate with the reserve tank 2.

In the brake fluid pressure boosting system of this embodiment configured as described above, when braking, the brake pedal 27 is depressed to switch a control valve (not shown) provided in the power piston 6a of the brake fluid pressure booster 6. This causes the pressurized hydraulic fluid to act on the power piston 6a. As a result, the power piston 6a operates, so the pair of pistons 18 and 19 of the mask cylinder 17 operate.
Brake fluid pressure is generated in the pair of pressure chambers 2021. This brake fluid pressure is applied to the brake cylinders 23, 24 of each wheel,
Braking is applied at 25.26.

In addition, the pressure switch 12 for pump operation ON and ○FF
．． 13 controls the ON/OFF operation of the hydraulic pump 4 so that a predetermined hydraulic pressure is maintained within the accumulator 14 at all times. In this embodiment, ON/OFF control of the pump operation is performed by two switches 12, 13, but it is also possible to perform ON/OFF control of the pump operation by a single switch.

By the way, if the pipe of the hydraulic pump side passage 5a and the high-pressure hose 9 are cut, or the screws of the home connector at the connecting part of the high-pressure hose 9 become loose, etc., the cut part of the pipe and the high-pressure hose of the hydraulic pump side passage 5a occurs. Alternatively, brake fluid pressure may leak from the hose connection, causing the fluid pressure to drop. At this time, the hydraulic fluid on the downstream side of the check valve 11, that is, on the side of the brake fluid pressure booster 6 from the check valve 11, is prevented from flowing out to the high pressure hose 9 side by the reverse valve 11. The hydraulic pressure on the downstream side of the stop valve 11 does not decrease. Therefore, even if pressure leaks from the passage closer to the high pressure hose 9 than the check valve 11, the brake fluid pressure booster 6 can operate reliably. In this case, since a predetermined hydraulic pressure is stored in the accumulator 14, the brake fluid pressure booster 6 can be operated a predetermined number of times.

FIG. 2 is a diagram showing another embodiment of the present invention.

It should be noted that the same components as those in the above-mentioned embodiments are given the same reference numerals, and their explanations will be omitted.

As shown in FIG. 2, two accumulators are provided in this embodiment. That is, in addition to the accumulator 14 of the embodiment described above, one more accumulator 28 is provided between the high pressure hose 9 and the check valve 11.

This accumulator 28 absorbs the pulsation of the pump 4 and accumulates a predetermined pressure.

In the supply passage between the accumulator 28 and the check valve 11, a second high-pressure hose 29, a pump operating pressure switch 30, and a brake fluid pressure booster alarm pressure switch 31 are arranged in order from the upstream side. has been done. By providing the second high pressure hose 29, the supply passage 5 has five lines: the hydraulic pump side passage 5a, the intermediate passage 5C, the brake fluid pressure booster 6 side passage 5b, and the two high pressure hoses 9, 29. It consists of a tube.

Further, in this embodiment, an anti-skid control device 22 is incorporated in the brake hydraulic pressure circuit between the mask cylinder 17 and each brake cylinder 23, 24, 25, 26.

In that case, the anti-skid control device 22 is provided with its own hydraulic pressure source.

The anti-skid control device 22 controls the brake fluid pressure so that each wheel does not lock or, if locked, the lock is immediately released.

Further, in this embodiment, the brake circuit is set to the X pipe, and one pressure chamber 20 is connected to the anti-skid control device 2.
2 to a brake cylinder 24 on the right side of the front wheel, and to a brake cylinder 26 on the left side of the rear wheel through an anti-skid control device 22 and a dual provisioning valve 32, respectively. Further, the other pressure chamber 21 communicates with a brake cylinder 23 on the left side of the front wheel via an anti-skid control device 22, and a brake cylinder 25 on the right side of the rear wheel via the anti-skid control device 22 and a dual proportioning valve 32, respectively.

Furthermore, the discharge passage 7 is equipped with a low pressure hose 33 and a filter 3.
4 is disposed, and a filter 35 is disposed on the reserve tank side of the suction passage 3.

The operation of the brake fluid pressure boosting system 1 of this embodiment configured as described above is almost the same as that of the above-mentioned embodiment during normal brake operation, but is different from the operation of the dual provisioning valve 32 during braking. Skinned control differs from the previous embodiment.

When the brake hydraulic pressure exceeds a predetermined hydraulic pressure, the dual provisioning valve 32 makes the rising gradient of the brake hydraulic pressure supplied to the brake cylinders 25, 26 on the rear wheel side smaller than that on the front wheel side. This suppresses rear wheel locking due to a reduction in the load applied to the rear wheels during braking.

By the way, if at least one of the two high-pressure hoses 9, 29 is broken, or if the threads of the hose connector in the pipe of the intermediate passage 5C or the connecting part of the high-pressure hoses 9, 29 become loose, the check valve 11, the hydraulic pressure in the upstream passage decreases. However, due to the check valve 11, this check valve 11
Downstream ([L] In other words, the hydraulic pressure between the brake fluid pressure booster 6 and the check valve 11 does not decrease, and the brake fluid pressure booster 6 can operate reliably. In particular,
In this embodiment, two accumulators 14 and 28 are provided, so if the pipe of the pump side passage 5a breaks,
The brake fluid pressure booster 6 can be reliably operated more times.

In this way, the reliability of the brake boost system 1 is also improved in this embodiment.

Note that the present invention is not limited to the above-described embodiments, and various design changes are possible.

For example, in the two embodiments described above, the present invention is applied to a brake fluid pressure boosting system in which one or two of the plurality of pipes constituting the supply passage 5 are formed of flexible high-pressure hoses. However, the present invention can also be applied to a brake fluid pressure boosting system in which the supply passage 5 is formed only from an ordinary pipe.

Further, in the embodiment shown in FIG. 2, a check valve is not provided in the intermediate passage 5C in which the accumulator 28 is provided, but a check valve having the same function as the check valve 11 is installed in the accumulator 2.
It can also be provided just before the upstream side of 8. In this way, even if the high-pressure hose 9 is broken or the hose connector of the high-pressure hose 9 becomes loose, the hydraulic pressure in the accumulator 28 will not decrease, so the two accumulators 1
The hydraulic pressure of 4.28 mm can be used effectively, and the brake hydraulic pressure booster 6 can be operated more often.

Further, in any of the embodiments described above, the check valve 11 is used as a hydraulic fluid flow blocking means, but for example, the upstream hydraulic pressure of the hydraulic fluid flow blocking means is used as a pilot pressure, and when the upstream hydraulic pressure is equal to or higher than a predetermined pressure. The hydraulic fluid flow blocking means can also be formed by a valve that opens a passage using this pilot pressure and closes the passage using the pilot pressure when the upstream hydraulic pressure drops below a predetermined pressure. Further, the hydraulic fluid flow blocking means can also be formed by detecting the upstream hydraulic pressure with a pressure switch and using a solenoid valve that is operated based on the detection signal to switch the passage.

Furthermore, in the embodiment shown in FIG.
22 has its own dedicated hydraulic pressure source, but the present invention provides a brake fluid that uses the hydraulic pressure source of the brake fluid pressure booster 6 as the hydraulic pressure source of the anti-skid control device 22. It can also be applied to pressure boosting systems. The present invention can also be applied to a hydraulic boost system in which a traction control device is added to the anti-skid control device 22. Furthermore, it can also be applied to a full power brake system in which the hydraulic pressure of a brake hydraulic pressure booster is directly introduced into the wheel cylinder.

Furthermore, it goes without saying that the present invention can be applied to other hydraulic pressure boosting systems other than the brake hydraulic pressure boosting system, such as a clutch hydraulic pressure boosting system.

(Effects of the Invention) As is clear from the above explanation, according to the hydraulic boosting system of the present invention, damage to the upstream side of the hydraulic fluid flow blocking means due to breakage of the pipe or loosening of the pipe connection part, etc. When the pressure on the side fails, the hydraulic fluid flow blocking means prevents the hydraulic fluid on the downstream side of the hydraulic fluid flow blocking means from flowing toward the upstream side of the hydraulic fluid flow blocking means. A pressure drop downstream of the flow blocking means can be prevented. Therefore, the hydraulic booster can operate reliably,
Improves reliability of hydraulic boost system.

Furthermore, by disposing a pressure accumulating means in the supply passage between the hydraulic fluid flow blocking means and the hydraulic booster, the hydraulic booster can operate a predetermined number of times in the event of the aforementioned pressure failure. Therefore, the reliability of the hydraulic pressure boosting system can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of a hydraulic pressure boosting system according to the present invention, FIG. 2 is a diagram showing another embodiment of the present invention, and FIG. 3 is an example of a conventional brake fluid pressure boosting system. FIG. 1... Brake boost system (hydraulic pressure boost system),
2... Reserve tank 4... Hydraulic pressure pump (hydraulic pressure generating means), 5... Supply passage, 6... Brake fluid pressure booster (hydraulic pressure booster), 9... High pressure hose, 11.
...Check valve (working fluid flow prevention means), 14...Accumulator (pressure accumulation means), 17...Tandem type mask cylinder patent applicant Jidosha Kiki Co., Ltd.

Claims (4)

[Claims] (1) During operation, pressurized hydraulic fluid is supplied from the hydraulic pressure generating means to the hydraulic booster through the supply passage, so that the hydraulic booster boosts the input to a predetermined magnitude. In a hydraulic pressure boosting system configured to output the same amount of water, the supply passage is configured by connecting a plurality of pipes,
Among these plurality of pipes, a pipe connected to the hydraulic pressure booster is provided with a hydraulic fluid flow blocking means, and this hydraulic fluid flow blocking means is used to prevent at least the fluid from flowing when the pressure is lost upstream of the hydraulic fluid flow blocking means. A hydraulic pressure boosting system, characterized in that it is means for blocking the flow of hydraulic fluid from the pressure booster side toward the hydraulic pressure generating means side. (2) The hydraulic fluid according to claim 1, wherein the hydraulic fluid flow blocking means is a check valve that only allows the hydraulic fluid to flow from the hydraulic pressure generating means toward the hydraulic pressure booster. Pressure boost system. (3) The hydraulic pressure boosting system according to claim 1 or 2, wherein at least one of the plurality of pipes other than the pipe connected to the hydraulic pressure booster is a flexible hose. . (4) The hydraulic fluid according to any one of claims 1 to 3, wherein a pressure accumulating means is disposed in the supply passage between the hydraulic fluid flow blocking means and the hydraulic pressure booster. Pressure boost system.