JP2011063129A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a hydraulic device which entraps fluid leaked from a hydraulic pump without restrictions on the amount thereof, and ensures the degree of freedom in terms of design changes such as specification changes of an atmospheric reservoir to perform the entrapment, installation point changes, and layout changes of communication passages. <P>SOLUTION: The hydraulic device includes: a pump housing 1 incorporating the hydraulic pump 2; the atmospheric reservoir 8 for storing the fluid in the atmospheric state; a rotary shaft 3 for driving the pump; and a leaked fluid inflow chamber 4 disposed within the pump housing 1. The atmospheric reservoir 8 is formed separately from the pump housing 1, and is disposed outside the pump housing. The leaked fluid inflow chamber 4 is connected to the atmospheric reservoir 8 through a connection passage 9 comprised of a pipe or hose. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pump device that is employed as a power-driven hydraulic pressure source in a vehicle hydraulic brake device or the like, and more specifically, takes in liquid (pressure medium) leaking from a pump chamber into a reservoir without being subjected to quantitative restrictions. It is related with the pump apparatus which enabled it to ensure the freedom of the design regarding the change of the specification and installation point of a reservoir, the layout of the connection path which connects a pump and a reservoir, etc.

  As conventional examples of a power-driven hydraulic pump, a vehicle hydraulic control device including the same, or a brake device, for example, there are those disclosed in Patent Documents 1 to 3 below.

  The pump for a brake actuator disclosed in Patent Document 1 has a high pressure seal and a low pressure seal that are double sealed with a high pressure seal and a low pressure seal around a rotary shaft for driving a pump inserted in the pump housing. Oil and air are contained in an oil seal chamber formed between the two.

  Further, the hydraulic pressure control device disclosed in Patent Document 2 takes in brake fluid (operating oil) leaked from the piston pump into a liquid reservoir chamber provided in the valve storage case through an oil passage formed in the pump housing. I am doing so.

  Furthermore, in the hydraulic actuator of Patent Document 3, the bottom surface of the actuator body is closed with a pot plate attached to the bottom surface, and a recess provided in the pot plate is used as a liquid reservoir to store brake fluid leaked from the piston pump. I try to accumulate.

JP 2004-52988 A JP 2009-111484 A JP 2004-338565 A

  The high-pressure oil discharged from the pump leaks slightly into the oil seal chamber in the closed space through the high-pressure seal portion during driving. However, the pump disclosed in Patent Document 1 has a limited volume of the oil seal chamber, and the amount of oil that can be taken into the oil seal chamber is limited.

  On the other hand, the hydraulic device disclosed in Patent Document 2 is provided with a chamber that can be referred to as a second liquid reservoir chamber in a location different from the cam chamber into which the leaked liquid flows. It is possible to increase the amount of liquid introduced. However, in this hydraulic device, since the liquid storage chamber is formed in the valve storage case, there is a limit to the volume of the liquid storage chamber, and the size of the liquid storage chamber and the installation point can be changed. The degree of freedom related to the design change, such as the layout change of the communication passage leading to the room, is also small.

  The hydraulic actuator of Patent Literature 3 also has the same problem as the hydraulic device of Patent Literature 2 because the liquid reservoir is provided on the pot plate with the bottom surface of the actuator body closed.

  In addition to this, the pump of Patent Document 1 is designed to mitigate an increase in pressure in the oil seal chamber due to oil leaked by enclosing air in the oil seal chamber, but still leaked oil is accumulated. And the oil seal chamber is unavoidably high pressure. Therefore, the device and the countermeasure for maintaining the durability of the low pressure seal are also required.

  This invention can take in the liquid leaked from the hydraulic pump without being restricted by the amount, and it is also possible to change the design of the reservoir that changes the specification, change the installation point, change the layout of the communication path, etc. An object is to realize a hydraulic device that ensures a degree of freedom.

In order to solve the above problems, in the present invention, the pump device is configured as follows. That is, a pump housing with a built-in hydraulic pump, an atmospheric pressure reservoir for storing liquid at atmospheric pressure, a rotary shaft for driving a pump inserted through the pump housing, and liquid leaking from the hydraulic pump. A leakage inflow chamber disposed within the pump housing for receiving, and a connection path for communicating the leakage inflow chamber with the atmospheric pressure reservoir;
The atmospheric pressure reservoir is formed separately from the pump housing and provided outside the pump housing. Further, the connection path is constituted by a pipe or a hose, and the leakage liquid is introduced through the pipe or hose. A connection port leading to the chamber and the atmospheric pressure reservoir were connected to each other.

As the pump device, those listed below as practical forms are conceivable.
(1) A master cylinder reservoir that supplies brake fluid to a master cylinder of a hydraulic brake device is used in combination as the atmospheric pressure reservoir, and the connection path is independent from the discharge path of the master cylinder. Provided between.
(2) The atmospheric pressure reservoir is disposed below the pump housing, and the liquid that has flowed into the leakage inflow chamber is caused to flow into the atmospheric pressure reservoir by gravity.

  The pump device according to the aspect (1) includes a first seal member that blocks a communication space between the leakage liquid inflow chamber and the outside, an outer periphery of the rotating shaft, the leakage liquid inflow chamber, and the hydraulic pump. And a second seal member for blocking the communication space between the first seal member and the second seal member, and an oil seal chamber serving as the leakage liquid inflow chamber is disposed on the outer periphery of the rotary shaft. It can utilize suitably for the pump made.

  In the pump device of that type, it is preferable that the connection port is connected to the leakage liquid inflow chamber above the contact portion between the rotating shaft and the first seal member. It is also preferable that the connection path is connected to the atmospheric pressure reservoir (master cylinder reservoir) under the liquid level of the liquid stored in the atmospheric pressure reservoir.

  On the other hand, the pump device of the form (2) can include a bracket fixed at a fixed position, and the atmospheric pressure reservoir can be supported by the bracket. The bracket in this case is useless if a support bracket for the pump housing is used, but a dedicated bracket may be used, or it may be attached to piping around the apparatus. In the case of a pump device mounted on a vehicle, the atmospheric pressure reservoir can be fixed to an appropriate part of the vehicle body.

  Further, when the atmospheric pressure reservoir is provided in the bracket, the liquid chamber of the reservoir can be formed in the bracket itself.

  The atmospheric pressure reservoir provided below the pump housing may not have a function of returning the inflowed liquid to the pump. For such an atmospheric pressure reservoir, it is preferable to provide a drain port for discharging the inflowed liquid and a cock or stopper (so-called blind plug) for opening and closing the drain port.

  Note that the atmospheric pressure reservoir provided below the pump housing secures a required volume of the space in the connection path (pipe or hose) connected to the pump housing, and forms the liquid chamber of the reservoir in the space in the path. It is also possible to do. This type of reservoir can also ensure a sufficient volume of the liquid chamber by increasing the inner diameter of the pipe or hose or by spirally winding the pipe or hose.

  The pump device according to the present invention is provided inside the pump housing by providing an atmospheric pressure reservoir separate from the pump housing outside the pump housing, and connecting the pump housing and the atmospheric pressure reservoir with a pipe or a hose. Since the leaked fluid inflow chamber communicated with the atmospheric pressure reservoir, design changes such as changes in the specifications of the atmospheric pressure reservoir, changes in installation points, and changes in the layout of piping can be made freely.

  In addition, since the volume of the atmospheric pressure reservoir can be set freely, the restriction on the intake amount of liquid leaking from the pump is also removed, and the pressure rise of the leakage liquid inflow chamber and the leakage liquid inflow chamber due to the intake amount restriction are isolated from the outside. There is no problem such as a decrease in the durability of the seal.

  In addition, the effect | action and effect of the pump apparatus mentioned as a preferable form are demonstrated later.

Sectional drawing which shows 1st form of the pump apparatus of this invention Sectional drawing which shows the 2nd form of the pump apparatus of this invention Sectional drawing which shows the 3rd form of the pump apparatus of this invention Sectional drawing which shows the 4th form of the pump apparatus of this invention Sectional drawing which shows 5th form of the pump apparatus of this invention Sectional drawing which shows the 6th form of the pump apparatus of this invention Sectional drawing which shows the 7th form of the pump apparatus of this invention Sectional drawing which shows the 8th form of the pump apparatus of this invention Sectional drawing which shows 9th form of the pump apparatus of this invention

Embodiments of the pump device according to the present invention will be described below with reference to FIGS.
FIG. 1 shows an application of the present invention to a pump device incorporating a gear pump employed in a vehicle brake hydraulic pressure control device. The gear pump has a pump rotor 2a in which an inner rotor and an outer rotor having a difference in the number of teeth are combined, and the liquid is obtained by utilizing the volume change accompanying the rotor rotation of the pumping chamber formed between the teeth of both rotors. Inhale / discharge.

  In the figure, reference numeral 1 denotes a pump housing, in which a hydraulic pump (in the figure, a gear pump) 2 is built. A rotary shaft 3 driven by a motor (not shown) is inserted into the pump housing 1, and the rotary shaft 3 is connected to the inner rotor of the hydraulic pump 2 to rotate the inner rotor. In the illustrated gear pump, when the inner rotor is driven to rotate, the outer rotor meshed with the inner rotor is driven to rotate to operate the pump.

  The pump device of FIG. 1 has a leakage fluid inflow chamber 4 inside the pump housing 1 (referred to as an oil seal chamber in the figure), and the leakage fluid inflow chamber 4 is disposed on the outer periphery of the rotary shaft 3. A first seal member 5 for blocking the communication space between the leaking liquid inflow chamber 4 and the outside, and a second seal member 6 for blocking the communication space between the leaking liquid inflow chamber 4 and the hydraulic pump 2 are provided. This is a room partitioned from the periphery by the first and second seal members 5 and 6.

  Both the space for communicating between the leakage fluid inflow chamber 4 and the outside and the space for communication between the leakage fluid inflow chamber 4 and the hydraulic pump 2 exist between the rotary shaft 3 and the pump housing. This space is sealed with the first and second seal members 5 and 6, thereby preventing liquid leakage from the hydraulic pump 2 and liquid leakage from the leakage liquid inflow chamber 4 to the outside.

  However, a small amount of liquid leakage from the hydraulic pump 2 to the leakage liquid inflow chamber 4 is unavoidable, and the leaked liquid is accumulated in the leakage liquid inflow chamber 4. As the accumulation proceeds, sometime it will exceed the capacity of the leakage inflow chamber 4 to take in the leakage.

  In order to eliminate the problem, the pump device of FIG. 1 is provided with a connection port 7 communicating with the leakage liquid inflow chamber 4 in the pump housing 1, and the connection port 7 is installed at the outside of the pump housing 1. The reservoir 8 is connected through a connection path 9. The connection path 9 is composed of a pipe, for example, a metal pipe such as a steel pipe, a hard resin pipe, or a hose (a flexible pipe made of soft resin or rubber).

  The illustrated atmospheric pressure reservoir 8 is a master cylinder reservoir that supplies brake fluid to the master cylinder 10. This master cylinder reservoir is included as an essential element in the vehicle hydraulic brake device, and by using it, an increase in cost can be suppressed.

  Further, by connecting the leakage fluid inflow chamber 4 to the atmospheric pressure reservoir 8, pressure increase due to leakage of the leakage fluid in the leakage fluid inflow chamber 4 is eliminated. For this reason, fatigue due to the pressure of the first seal member 5 does not occur, and the first seal member 5 does not need to be pressure resistant.

  Note that the connection path (pipe or hose) 9 is preferably connected to the atmospheric pressure reservoir 8 under the surface of the brake fluid stored in the reservoir. The brake fluid overflowing from the leakage fluid inflow chamber 4 can be taken into the atmospheric pressure reservoir 8 even when the connection is made on the fluid level, but the leakage fluid inflow chamber 4 is always filled with the brake fluid when connected below the fluid level. The first seal member 5 is stably lubricated.

  The connection port 7 is connected to the leakage liquid inflow chamber 4 above the contact portion between the rotary shaft 3 and the first seal member 5, which also contributes to the stabilization of the lubrication of the first seal member 5. To do.

  In order to stabilize the lubrication of the first seal member 5, it is sufficient that the connection of the connection port 7 is made higher than the lowest position of the contact portion (in the structure, the leakage liquid inflow chamber 4 is not connected). The fluid level of the brake fluid that has flowed in easily reaches the contact portion, and the lubrication of the contact portion between the first seal member 5 and the rotary shaft 3 is stabilized), but is not necessarily above the uppermost position of the contact portion. It does not have to be made. However, in the structure in which the connection of the connection port 7 is made above the uppermost position of the contact portion, the level of the brake fluid flowing into the leaking fluid inflow chamber 4 is likely to reach the uppermost position of the contact portion. The contact portion is easily immersed in the brake fluid over the entire circumference, and as a result, further stabilization of the lubrication of the seal portion by the first seal member 5 is achieved. In addition, regarding the contact portion between the rotating shaft 3 and the second seal member 6, if the contact portion of both is immersed in the brake fluid over the entire circumference, the hydraulic pump 2 side is temporarily connected to the leakage fluid inflow chamber 4 side. Even if the pressure becomes low, the inflow of air from the leakage liquid inflow chamber 4 to the hydraulic pump 2 through this contact portion is completely prevented.

  FIG. 2 shows the application of the present invention to a pump device incorporating a piston pump employed in a vehicle brake hydraulic pressure control device. The pump housing 1 incorporates a hydraulic pump 2 that reciprocates the piston 2b to suck and compress the brake fluid and discharge it.

  A cam chamber 11 is formed in the pump housing 1, and a cam 12 housed in the cam chamber 11 is rotationally driven by a rotating shaft 3 (shown in the figure as an output shaft of a motor 13) inserted into the pump housing 1. The actuated piston 2b operates.

  The outer periphery of the rotating shaft 3 inserted into the cam chamber 11 is sealed by an annular seal member 14, and a part of the cam chamber 11 defined from the motor side by the annular seal member 14 constitutes the leakage liquid inflow chamber 4. . The pump housing 1 is provided with a connection port 7 that communicates with the leaking fluid inflow chamber 4, and the leaking fluid inflow chamber 4 is also used in combination with a master cylinder reservoir through a connection path 9 that connects to the connecting port 7. Connected to the atmospheric pressure reservoir 8. The connection path 9 of this embodiment is also composed of a pipe or a hose.

  The pump device shown in FIGS. 1 and 2 that takes in the brake fluid leaking from the pump into the master cylinder reservoir has a common configuration of the gist of the invention, although the type of the pump is different. In this type of pump device, the pressure of the leaking fluid inflow chamber 4 is always kept at atmospheric pressure by providing the connecting path 9 made of pipes and hoses as a path independent of the discharge path 15 of the master cylinder 10 as shown in the figure. In addition, the degree of freedom of the piping layout can be obtained.

  FIGS. 3 to 9 show a configuration in which a dedicated atmospheric pressure reservoir 8 separate from the master cylinder reservoir is provided to take in liquid leaked from the pump.

  In any of these pump devices, the atmospheric pressure reservoir 8 is disposed below the pump housing 1, and the atmospheric pressure reservoir 8 and the connection port 7 provided in the pump housing 1 are connected by a connection path 9 made of a pipe or a hose. By connecting, the liquid flowing into the leakage liquid inflow chamber 4 flows into the atmospheric pressure reservoir 8 by gravity.

  The hydraulic pump 2 built in the pump housing 1 may be a piston pump (FIGS. 3 and 5 to 9) or a gear pump (FIG. 4). The connection port 7 communicates with the lower part of the leakage fluid inflow chamber 4 and is opened at the bottom surface of the pump housing 1. The brake fluid flowing into the leakage fluid inflow chamber 4 flows out by gravity through the connection port 7, and the pipe Or, it flows into the atmospheric pressure reservoir 8 through the connection path 9 formed by a hose.

  The atmospheric pressure reservoir 8 employed in these embodiments is merely a container and has no function of pushing out the brake fluid that has flowed in.

  The leak inflow chamber 4 of the pump device of FIGS. 3 and 5 to 9 is formed by a part of the cam chamber 11, and this configuration is not different from the device of FIG.

  On the other hand, the pump device of FIG. 4 is fixed to one surface of the pump housing 1 and the first seal member 5 provided on the outer periphery of the rotary shaft 3 on the side opposite to the pump than the second seal member 6 (the side far from the pump). A leakage fluid inflow chamber 4 is formed between the motor 13 for driving the rotary shaft, and the brake fluid that has flowed into the leakage fluid inflow chamber 4 is introduced into the atmospheric pressure reservoir 8 through the connection path 9.

  The pump device of FIG. 4 has an oil seal chamber 16 in which brake fluid is stored between a first seal member 5 and a second seal member 6 that seal the outer periphery of the rotary shaft 3. In the pump device of FIG. 1, that portion is the leakage inflow chamber 4, but in the case of the pump device of FIG. 4, if the lower end of the oil seal chamber 16 is directly connected to the atmospheric pressure reservoir 8, The brake fluid leaks and the first seal member 5 is not lubricated.

  Therefore, a room partitioned from the oil seal chamber 16 is used as the leakage fluid inflow chamber 4, and brake fluid overflowing from the oil seal chamber 16 is caused to flow to the atmospheric pressure reservoir 8 via the leakage fluid inflow chamber 4. . In addition, a communication hole 23 is provided in the pump housing 1 with one end opening at the top of the oil seal chamber 16 and the other end opening into the leakage liquid inflow chamber 4. The amount of stored brake fluid is increased to stabilize the lubrication of the first seal member 5.

  The communication hole 23 described above may be omitted. In this case, the oil seal chamber 16 is sealed, but the brake fluid in the oil seal chamber 16 leaks into the leak fluid inflow chamber 4 through the contact portion between the first seal member 5 and the rotary shaft 3. The liquid is introduced into the atmospheric pressure reservoir 8 through the connection path 9. At this time, the brake fluid that leaks into the leakage fluid inflow chamber 4 through the contact portion between the first seal member 5 and the rotating shaft 3 contributes to lubrication of the first seal member 5.

  The atmospheric pressure reservoir 8 of the pump device of FIGS. 3 to 9 is supported using a bracket or the like. As shown in FIG. 5, a housing support bracket 18 supported by a vehicle body 17 is included in the pump device, and the bracket 18 that supports the pump housing 1 also serves as the housing support bracket 18 and serves as an atmospheric pressure reservoir. 8 can also be supported by the housing support bracket 18.

  Further, as shown in FIG. 6, a dedicated reservoir support bracket 19 supported by the vehicle body 17 may be provided, and the atmospheric pressure reservoir 8 may be supported by the bracket 19. When the bracket is used, the ease of assembly to the vehicle is improved. However, as shown in FIG. 7, the atmospheric pressure reservoir 8 can be directly fixed to the vehicle body 17, and the rigid brake pipe 20 shown in FIG. It is also possible to fix to the brake pipe 20.

  Further, as shown in FIG. 8, the liquid chamber 8 a of the atmospheric pressure reservoir 8 can be provided in the bracket 18. In the pump device of FIG. 8, a concave portion is formed in the bracket 18, and a lid is put on the inlet of the concave portion to form the atmospheric pressure reservoir 8 integrally with the bracket 18, so that cost reduction by integration of parts can be expected. The bracket 19 in FIG. 6 can be similarly provided with an integral atmospheric pressure reservoir.

  In the atmospheric pressure reservoir 8 employed in the embodiment shown in FIG. 3 and subsequent figures, a drain port 21 that discharges the inflowing liquid, a cock 22 that opens and closes the drain port 21, or a stopcock (blind plug) that replaces it is installed. preferable. In recent years, the brake devices have increased opportunities to operate the pump device due to diversification of control, and accordingly, the amount of brake fluid leaked from the pump tends to increase. By providing the drain port 21 and the cock 22 (or stopcock), it becomes possible to easily drain the brake fluid that has been collected regularly, and the maintainability is improved.

  Note that the connection path 9 composed of pipes and hoses can be liquidated in the internal space if the inner diameter is increased or the pipe or hose is spirally wound to secure a sufficient volume of the internal space. It is also possible to form a chamber and form the atmospheric pressure reservoir 8 with only pipes and hoses. This structure can be expected to have a better cost reduction effect.

  As described above, the pump device of the present invention is provided with the atmospheric pressure reservoir separate from the pump housing outside the pump housing, and the pump housing and the atmospheric pressure reservoir are connected by a pipe or a hose. Design changes such as change of specifications, change of installation points, and change of piping layout can be made freely.

  The pump device according to the present invention is effective as a pressure generating source for a vehicle brake hydraulic pressure control device, a hydraulic booster, an accumulator and the like having an electronic control function such as ABS (Anti-Lock Brake System), ESC (Electronic Stability Control). Can be used.

DESCRIPTION OF SYMBOLS 1 Pump housing 2 Hydraulic pump 2a Pump rotor 2b Piston 3 Rotating shaft 4 Leakage fluid inflow chamber 5 First seal member 6 Second seal member 7 Connection port 8 Atmospheric pressure reservoir 8a Liquid chamber 9 Connection path 10 consisting of pipe or hose Master Cylinder 11 Cam chamber 12 Cam 13 Motor 14 Ring seal member 15 Master cylinder discharge path 16 Oil seal chamber 17 Car body 18 Housing support bracket 19 Reservoir support bracket 20 Brake piping 21 Drain port 22 Cock 23 Communication hole

Claims (10)

A pump housing (1) containing a hydraulic pump (2);
An atmospheric pressure reservoir (8) for storing liquid at atmospheric pressure;
A rotary shaft (3) for driving a pump inserted through the pump housing (1);
A leakage inflow chamber (4) installed inside the pump housing (1) for receiving liquid leaked from the hydraulic pump (2);
A connection path (9) for communicating the leaking fluid inflow chamber (4) with the atmospheric pressure reservoir (8);
The atmospheric pressure reservoir (8) is formed separately from the pump housing (1) and provided outside the pump housing (1), and the connection path (9) is constituted by a pipe or a hose, A pump device in which a connection port (7) communicating with the leakage liquid inflow chamber (4) provided in the pump housing (1) and the atmospheric pressure reservoir (8) are connected to each other via a pipe or a hose.   A master cylinder reservoir for supplying brake fluid to the master cylinder (10) of the hydraulic brake device is used in combination as the atmospheric pressure reservoir (8), and the connection path (9) is a discharge path (15) of the master cylinder (10). 2. The pump device according to claim 1, wherein the pump device is provided between the pump housing (1) and the atmospheric pressure reservoir (8) as an independent path.   A first seal member (5) for blocking a communication space between the leakage liquid inflow chamber (4) and the outside, an outer periphery of the rotating shaft (3), the leakage liquid inflow chamber (4), and the hydraulic pressure A second seal member (6) for blocking a communication space between the pump (2) is provided, and the leakage liquid inflow chamber (4) is connected to the first seal member (5) and the second seal member (6). The pump device according to claim 2, wherein the pump device is sandwiched and arranged on an outer periphery of the rotating shaft (3).   The connection port (7) is connected to the leakage liquid inflow chamber (4) above a contact portion between the rotating shaft (3) and the first seal member (5). Item 4. The pump device according to Item 3.   The connection path (9) constituted by a pipe or a hose is connected to the atmospheric pressure reservoir (8) under the liquid level of the liquid stored in the atmospheric pressure reservoir (8). The pump apparatus in any one of 2-4.   The atmospheric pressure reservoir (8) is disposed below the pump housing (1), and the liquid flowing into the leakage liquid inflow chamber (4) is caused to flow into the atmospheric pressure reservoir (8) by gravity. The pump device according to claim 1, wherein   The pump device according to claim 6, wherein a bracket (18 or 19) fixed in a fixed position is included, and the atmospheric pressure reservoir (8) is supported by the bracket (18 or 19).   The pump device according to claim 7, wherein a liquid chamber (8a) of the atmospheric pressure reservoir (8) is formed in the bracket (18 or 19).   The said atmospheric pressure reservoir (8) is provided with a drain port (21) for discharging the inflowed liquid and a cock (22) or stopper for opening and closing the drain port (21). The pump apparatus in any one of -8.   A required amount of volume in the connecting path (9) constituted by a pipe or a hose is secured, and a liquid chamber of the atmospheric pressure reservoir (8) is formed in the space in the path. The pump apparatus in any one of -9.

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