JP2016130092A - Reservoir of fluid pressure master cylinder for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reservoir of a fluid pressure master cylinder for a vehicle which can prevent the temporary reduction of a working fluid in a float chamber of a liquid level detection device even if a swing-back phenomenon of the working fluid occurs after the vehicle is abruptly decelerated and stopped, and can favorably perform bleeding when filling the working fluid into a liquid storage chamber.SOLUTION: A reservoir main body 5 of a reservoir 4 which is formed long in a vehicle body fore-and-aft direction is arranged at an upper part of a cylinder body 2 of a fluid pressure master cylinder 1, a working fluid pouring port 5a is formed at a vehicle body front side of the reservoir main body 5, and a liquid level detection device is arranged at a center of the vehicle fore-and-aft direction. A partitioning wall 9 in a reservoir main body width direction which partitions a liquid storage chamber to vehicle body fore-and-aft chambers is formed at a vehicle body rear side rather than the liquid level detection device of the reservoir main body 5. The partitioning wall 9 is formed into a dogleg shape which sequentially protrudes to a vehicle front side toward a center of the reservoir main body width direction, and a slit which makes the liquid storage chambers 3 at fore-and-aft sides of the partitioning wall 9 communicate with each other is formed at a center of the reservoir main body width direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a structure of a reservoir provided at an upper portion of a hydraulic master cylinder that operates a brake or clutch of an automobile with hydraulic pressure, and more specifically, a hydraulic master cylinder for a vehicle including a partition wall that partitions an interior of a liquid storage chamber. Relating to the reservoir.

  In recent years, due to diversification of the design of the engine compartment, including the engine compartment and the vehicle compartment, the reservoir located above the hydraulic master cylinder is forced to have a flat shape with a low height, while the hydraulic fluid Since the capacity must be secured, the shortage of the volume is compensated by taking the length in the longitudinal direction of the vehicle body. As a result, the liquid level of the hydraulic fluid may ripple during braking or acceleration of the vehicle, or the hydraulic fluid may move in the longitudinal direction of the vehicle body. For this reason, there has been a partition wall or rib that also serves as a reinforcement in the liquid storage chamber of the reservoir body to suppress movement of the hydraulic fluid and suppression of ripples (see, for example, Patent Document 1).

JP 2002-67923 A

  In the above-mentioned Patent Document 1, even when the reservoir is tilted forward together with the vehicle body during braking or acceleration of the vehicle, a predetermined amount of hydraulic fluid is injected into the float chamber of the liquid level detection device by the partition walls and ribs. It can be secured. However, when the vehicle suddenly decelerates and stops, it tilts so that the front of the reservoir body sinks together with the vehicle body, and after the hydraulic fluid in the reservoir storage chamber has moved greatly to the front of the vehicle body, The hydraulic fluid that moves greatly to the rear of the vehicle is swung back. At this time, the hydraulic fluid flows out from the float chamber to the vehicle body rear side of the liquid storage chamber, and the liquid level of the hydraulic fluid in the float chamber temporarily changes. There was a risk that the liquid level detection device would malfunction. In addition, when the hydraulic fluid is filled into the liquid storage chamber from the hydraulic fluid inlet, air easily accumulates at the corners of the partition walls and the ribs, and the air venting work is troublesome.

  Therefore, the present invention can prevent the hydraulic fluid in the float chamber of the liquid level detection device from temporarily decreasing and store even if the hydraulic fluid swings back after the vehicle suddenly decelerates and stops. It is an object of the present invention to provide a reservoir for a vehicle hydraulic master cylinder that can satisfactorily vent air when the hydraulic fluid is filled into the liquid chamber.

  In order to achieve the above object, the reservoir of the hydraulic master cylinder for a vehicle according to the present invention is a reservoir formed long in the longitudinal direction of the vehicle body above the cylinder body of the hydraulic master cylinder having the axis line oriented in the longitudinal direction of the vehicle body. A main body is disposed, a hydraulic fluid inlet for supplying hydraulic fluid to the reservoir chamber of the reservoir main body is provided on the vehicle body front side of the reservoir main body, and a liquid level for detecting the liquid level of the hydraulic fluid at the center in the longitudinal direction of the vehicle body. In the reservoir of a hydraulic master cylinder for a vehicle provided with a surface detection device, the reservoir body has a partition wall in the reservoir body width direction that partitions the liquid storage chamber into the front and rear of the vehicle body behind the liquid level detection device. The partition wall is formed in a square shape protruding gradually toward the front of the vehicle body toward the central portion of the reservoir body in the width direction, and the liquid storage before and after the partition wall is formed in the central portion of the reservoir body width direction. It is characterized in that a slit for communicating.

  The hydraulic master cylinder is a tandem hydraulic master cylinder, and a first union on the front side of the vehicle body that communicates the liquid storage chamber and a cylinder hole of the hydraulic master cylinder with the bottom wall of the reservoir body. Preferably, the slit is formed on a line that includes a hole and a second union hole on the rear side of the vehicle body and passes through the central axis of the first union hole and the central axis of the second union hole. Furthermore, the slit width of the slit may be narrower than the diameters of the second union hole and the first union hole. In addition, the slit is preferably provided with a wide portion having a wide slit width at the upper end.

  According to the reservoir of the hydraulic master cylinder for a vehicle of the present invention, the partition wall in the reservoir body width direction for partitioning the liquid storage chamber in the longitudinal direction of the vehicle body is provided at the rear of the vehicle body with respect to the liquid level detection device. Even if the hydraulic fluid swings back after stopping after decelerating, the hydraulic fluid in the float chamber of the liquid level detection device can be prevented from moving to the rear of the vehicle body, and malfunction of the liquid level detection device can be suppressed. be able to. Furthermore, the partition wall is formed in a square shape that gradually protrudes toward the front of the vehicle body toward the central portion of the reservoir body in the width direction, and the liquid storage chambers before and after the partition wall are communicated with the central portion in the width direction. By providing the slit, the working fluid can be satisfactorily filled, and there is no possibility that air mixed in the working fluid will accumulate as bubbles in the corners of the partition wall, and the air bleeding operation can be performed satisfactorily. . Further, the partition wall can reinforce the rear side of the reservoir in the vehicle body.

  Further, a slit is provided in the partition wall by providing a slit on a line passing through the central axis of the first union hole and the central axis of the second union hole of the reservoir body having the first union hole and the second union hole. Can be formed in a well-balanced manner, and the working fluid can be satisfactorily filled. Furthermore, by forming the slit width to be narrower than the diameters of the second union hole and the first union hole, the movement of the working fluid to the rear of the vehicle body can be satisfactorily suppressed even if the hydraulic fluid swings back. be able to. Moreover, when the said slit is provided with the wide part with a wide slit width | variety at the upper end side, when filling a hydraulic fluid, the air pushed toward the upper part side of a liquid storage chamber can be extracted favorably.

It is sectional drawing of the reservoir body which shows one example of this invention. It is II-II sectional drawing of FIG. It is III-III sectional drawing of FIG. It is IV-IV sectional drawing of FIG. It is a partial sectional view of a hydraulic master cylinder and a reservoir showing an example of the present invention.

  FIGS. 1 to 5 are views showing an example of a reservoir of a hydraulic master cylinder for a vehicle according to the present invention. In this embodiment, a reservoir attached to a brake hydraulic master cylinder for an automobile is described as an example. .

  A brake hydraulic master cylinder 1 is provided close to the dash panel in an engine room on the front side of the vehicle body that is partitioned by the passenger compartment and the dash panel. The hydraulic master cylinder 1 is a tandem type that supplies hydraulic fluid pressurized inside the cylinder body 2 to the two brake systems, and is arranged with the axis line in the longitudinal direction of the vehicle body. A reservoir 4 for storing the working fluid is attached inside. In addition, the cylinder body 2 and the reservoir 4 of the present embodiment are arranged on the front side of the vehicle body from the rear side of the vehicle body so that the hydraulic fluid does not leak to the outside even if it behaves so that the front side of the vehicle body sinks and the rear side floats during braking. It is arranged so as to be higher.

  The reservoir 4 is formed of a synthetic resin and includes a reservoir body 5 having a liquid storage chamber 3 and a hydraulic fluid inlet 5a, and a cap 6 that covers the hydraulic fluid inlet 5a. The reservoir body 5 is obtained by heat-sealing the reservoir upper half 5b and the reservoir lower half 5c at the fusion surface 5d, and the inside of the reservoir body 5 is the above-described liquid storage chamber 3, and is formed on the lower surface of the reservoir lower half 5c. The first boss portion 5e and the second boss portion 5f protrude from the primary boss portion 2a and the secondary boss portion 2b, which project from the first boss portion 5e and the second boss portion 5f. Reservoir body 5 is integrally connected to cylinder body 2 by fitting screws to both flanges 2c and 5g which are respectively fitted and overlapped with each other. The vehicle body rear side of the reservoir body 5 has a relatively flat shape with a low height because the instrument panel of the passenger compartment projects above the reservoir body 5, whereas the vehicle body front side of the reservoir body 5 is The reservoir body 5 is formed long in the longitudinal direction of the vehicle body in this manner so as to extend to the front of the instrument panel. Thus, the volume of the liquid storage chamber 3 restricted on the vehicle body rear side can be increased on the vehicle body front side. I make up for it.

  The reservoir upper half 5b has a front end that protrudes forward of the vehicle body relative to the cylinder body 2 and rises upward at a substantially right angle, is provided with the hydraulic fluid inlet 5a, and the cap 6 is attached to the hydraulic fluid inlet 5a. Has been. The reservoir lower half 5c, like the reservoir upper half 5b, has a first union hole 5h formed in the first boss portion 5e and the second boss portion 5f projecting to the lower surface on the rear side of the vehicle body. A second union hole 5i is provided, and the working fluid in the liquid storage chamber 3 is supplied to the cylinder hole in the hydraulic master cylinder 1 from the first union hole 5h and the second union hole 5i. In addition, a liquid level detection device 7 is provided at an intermediate position between the first boss portion 5e and the second boss portion 5f of the reservoir lower half 5c to notify the driver that the hydraulic fluid has been reduced to a specified amount. ing.

  The liquid level detection device 7 includes a float guide 7a protruding from the reservoir lower half 5c, a float 7c disposed in a float chamber 7b formed inside the float guide 7a, and a reed switch 7d. Has been. The float guide 7a is formed in a cylindrical shape, the vehicle body front side is lower than the fusion surface 5d of the reservoir upper half 5b and the reservoir lower half 5c, and the vehicle rear side is the height of the vehicle front side. The opening end surface 7e is formed so as to gradually become lower toward the front of the vehicle body. A slit 7f is cut in the float guide 7a so that the working fluid can flow between the liquid storage chamber 3 and the float chamber 7b formed inside the float guide 7a. The reed switch 7d is provided at the bottom of the float chamber 7b, and the float 7c is disposed above the reed switch 7d. The float 7c is formed in a short cylindrical shape that floats the liquid level in the float chamber 7b, and a magnet 7g for opening and closing the contact of the reed switch 7d is embedded therein. In this liquid level detection device 7, when the float 7c that descends while being guided by the float guide 7a approaches the reed switch 7d as the liquid level decreases, the magnet 7g provided on the float 7c causes the reed switch 7d to move. Energized to activate an alarm or warning light (not shown) to inform the driver that the amount of hydraulic fluid has fallen below a specified amount.

  The reservoir upper half 5b and the reservoir lower half 5c are provided with a plurality of ribs 8 having different heights and lengths. The ribs having a high height are the reservoir upper half 5b and the reservoir lower half. A rib half formed on the body 5c is attached to the body 5c to reinforce the reservoir body 5 and to prevent the hydraulic fluid from flowing. Further, a partition wall 9 in the reservoir body width direction that partitions the liquid storage chamber 3 in the front and rear of the vehicle body is provided behind the liquid level detection device 7 of the reservoir body 5.

  The partition wall 9 is formed by attaching partition wall halves 9a and 9a formed in the reservoir upper half 5b and the reservoir lower half 5c, and is formed higher than the height of the float guide 7a on the vehicle body rear side. The In addition, the partition wall 9 is formed in a square shape that gradually protrudes toward the center of the reservoir body in the width direction, and the liquid storage chambers 3 before and after the partition wall 9 are formed at the center of the reservoir body in the width direction. A slit 9b for communication is formed. The slit 9b is disposed on a line L1 passing through the central axis of the first union hole 5h and the central axis of the second union hole 5i, and the slit width T1 is set to the first union hole 5h and the second union hole. A wider portion 9c having a slit width wider than that of the slit 9b is formed at the upper end (the upper reservoir half 5b) of the slit 9b.

  The reservoir body 5 formed as described above is filled into the liquid storage chamber 3 while the working fluid is vented from the working fluid inlet 5a. At this time, the hydraulic fluid flowing in from the hydraulic fluid inlet 5a flows to the vehicle body rear side of the liquid storage chamber 3 through the slit 9b of the partition wall 9 and is satisfactorily filled. On the other hand, the air mixed in the hydraulic fluid flows to the rear side of the vehicle body together with the hydraulic fluid. At this time, it is conceivable that air accumulates in the form of bubbles on the wall surface of the partition wall 9, but the partition wall 9 is formed in a square shape that gradually protrudes toward the front of the vehicle body toward the center in the reservoir body width direction. At the same time, since the slit 9b is formed in the central portion of the reservoir body in the width direction, the air that has reached the partition wall 9 flows along with the hydraulic fluid toward the central portion of the reservoir body in the width direction, and does not collect at the corner of the partition wall 9. Air can be discharged well. Furthermore, since the wide part 9c with a wide slit width is formed at the upper end of the slit 9b, the air pushed toward the upper side of the liquid storage chamber 3 can be discharged well.

  Further, when the vehicle suddenly decelerates and stops, the vehicle body of the reservoir 4 is inclined so as to sink together with the vehicle body, and the hydraulic fluid in the liquid storage chamber 3 tends to move greatly forward of the vehicle body. And the reservoir 4 are arranged so as to be inclined so that the front side of the vehicle body is higher than the rear side of the vehicle body, and a plurality of ribs 8 are formed in front of the vehicle body rather than the float guide 7a. Can be satisfactorily suppressed, and the hydraulic fluid in the float chamber 7b can be prevented from being temporarily reduced as much as possible. Further, after that, when a hydraulic fluid swing back phenomenon occurs in which the hydraulic fluid greatly moves backward in the reverse direction, the partition wall 9 can satisfactorily suppress the backward movement of the hydraulic fluid to the float. It is possible to prevent the hydraulic fluid in the chamber 7b from temporarily decreasing as much as possible. Further, at this time, the slit width T1 of the slit 9b is formed to be narrower than the diameters of the first union hole 5h and the second union hole 5i. be able to. In this way, the plurality of ribs 8 and the partition walls 9 prevent the liquid level detection device 7 from malfunctioning when the vehicle suddenly decelerates and stops and when the hydraulic fluid swings back. be able to.

  In the present invention, the slit of the partition wall may not be arranged on a line passing through the central axis of the first union hole and the central axis of the second union hole as in the above-described embodiment. Moreover, the wide part does not need to be provided at the upper end of the slit. Furthermore, the present invention can be applied not only to a reservoir provided in a tandem hydraulic master cylinder, but also to a reservoir having one union hole provided in a single hydraulic master cylinder. The present invention can also be applied to a reservoir provided in the upper part of the pressure master cylinder. Further, the shape, height, and position of the rib provided in the reservoir are arbitrary.

DESCRIPTION OF SYMBOLS 1 ... Fluid pressure master cylinder, 2 ... Cylinder body, 2a ... Primary boss | hub part, 2b ... Secondary boss | hub part, 2c ... Flange, 3 ... Liquid storage chamber, 4 ... Reservoir, 5 ... Reservoir main body, 5a ... Hydraulic fluid inlet, 5b ... Reservoir upper half, 5c ... Reservoir lower half, 5d ... Fusion surface, 5e ... First boss part, 5f ... Second boss part, 5g ... Flange, 5h ... First union hole, 5i ... Second union Hole, 6 ... Cap, 7 ... Liquid level detection device, 7a ... Float guide, 7b ... Float chamber, 7c ... Float, 7d ... Reed switch, 7e ... Open side end face, 7f ... Slit, 7g ... Magnet, 8 ... Rib, 9 ... partition wall, 9a ... half partition wall, 9b ... slit, 9c ... wide part

Claims (4)

A reservoir body formed long in the longitudinal direction of the vehicle body is disposed on the cylinder body of the hydraulic master cylinder having the axis line oriented in the longitudinal direction of the vehicle body. In a reservoir of a hydraulic master cylinder for a vehicle provided with a hydraulic fluid inlet for supplying hydraulic fluid to the chamber and a liquid level detection device for detecting the hydraulic level of the hydraulic fluid at the center in the longitudinal direction of the vehicle body,
The reservoir body is provided with a partition wall in the reservoir body width direction that partitions the liquid storage chamber in the longitudinal direction of the vehicle body at the rear of the vehicle body relative to the liquid level detection device, and the partition wall is directed toward the central portion in the reservoir body width direction. A vehicle hydraulic master characterized in that it is formed in a square shape that gradually protrudes forward of the vehicle body, and a slit is provided in the central portion of the reservoir body in the width direction to communicate the liquid storage chambers before and after the partition wall. Cylinder reservoir.   The hydraulic master cylinder is a tandem hydraulic master cylinder, and a first union hole on the front side of a vehicle body that communicates the liquid storage chamber and a cylinder hole of the hydraulic master cylinder with a bottom wall of the reservoir body. And a second union hole on the rear side of the vehicle body, wherein the slit is formed on a line passing through the central axis of the first union hole and the central axis of the second union hole. Reservoir for vehicle hydraulic master cylinder.   The reservoir of a hydraulic master cylinder for a vehicle according to claim 2, wherein a slit width of the slit is narrower than a diameter of the second union hole and the first union hole.   The reservoir of a hydraulic master cylinder for a vehicle according to any one of claims 1 to 3, wherein the slit includes a wide portion having a wide slit width at an upper end.

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