JPH0210823Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a clutch release cylinder employed in a clutch device in a vehicle power transmission device.

(Prior Art) Generally, a clutch release cylinder has a cylinder body that has an inflow hole for fluid discharged from a master cylinder at one end thereof, and a clutch release cylinder that is fitted liquid-tightly and slidably in the axial direction into the inner hole of the cylinder body. A piston that is inserted into the inner hole and forms a fluid chamber communicating with the master cylinder at one end side thereof, and a piston that penetrates the other end side of the cylinder body and whose inner end is connected to the other end side of the piston and whose outer side It has a push rod connected at its end to the release fork of the clutch device. As a result, when the clutch pedal is depressed, fluid discharged from the master cylinder flows into the fluid chamber of the cylinder body and slides the piston toward the other end, thereby actuating the release fork via the push rod to close the clutch. The device is now disconnected. Furthermore, when the clutch pedal is released from this state, the spring force within the clutch device operates the push rod via the release fork, which causes the piston to slide toward one end and release some of the fluid in the fluid chamber. The clutch device is connected by allowing the flow to flow back to the master cylinder.

However, it is difficult to operate the clutch device when starting the vehicle, and especially when driving a vehicle for beginners or inexperienced drivers, the clutch device may be suddenly engaged. In this case, engine stalling and wheel spin often occur. This phenomenon can be alleviated by making effective use of the half-clutch area in the clutch device, so a clutch is equipped with an orifice and a check valve in the cylinder body to regulate the flow rate of fluid flowing back from the fluid chamber to the master cylinder. A release cylinder has been filed in Utility Model Application No. 181027/1983. This causes the push rod and piston in the clutch release cylinder to return slowly, resulting in a loose connection of the clutch system.

(Problem to be solved by the invention) However, when such a clutch release cylinder is adopted, the flow rate of fluid returned to the master cylinder is always regulated from the disconnected state to the fully connected state of the clutch device. In order to
There is a problem in that the timing when the clutch device reaches the connection start state is delayed.

(Means for Solving the Problem) The present invention has been made in order to deal with such problems, and in this type of clutch release cylinder, a rod of a predetermined length is coaxially protruded into the inlet hole at one end of the piston. At the same time, a valve body that is removably seated on the valve seat provided on the inner end side of the inflow hole to close the inflow hole is assembled so as to be movable by a predetermined amount in the axial direction. The structure is characterized by the fact that the valve body is provided with an orifice that is biased by a spring toward the valve body and that communicates the inflow hole with the fluid chamber.

(Operation of the invention) As a result, in the clutch release cylinder of the invention, when the clutch pedal is depressed, the fluid discharged from the master cylinder moves the valve body toward the other end and separates it from the valve seat of the cylinder body. The fluid flows into the fluid chamber and causes the piston to slide toward the other end, and while the piston is sliding a predetermined amount, the piston integrally moves the valve body in the same direction.
As a result, the push rod moves toward the outer end, actuating the release fork of the clutch and disconnecting the clutch.

When the clutch pedal is released, the release fork is urged in the return direction by the spring force within the clutch device, and the piston is slid toward one end via the push rod. When the piston returns, the fluid in the fluid chamber flows back to the master cylinder without any restrictions while the piston slides a predetermined amount, and when the piston slides a predetermined amount, the valve element seats elastically on the valve seat. Close the inflow hole. As a result, subsequent sliding of the piston causes fluid in the fluid chamber to flow back to the master cylinder at a flow rate regulated by the orifice of the valve body.

(Effect of the invention) Therefore, according to the invention, the sliding movement of the piston upon return can be made fast at first and then slowed down after sliding by a predetermined amount. In addition, the half-clutch state from the connection start state to the connection completion state can be extended for a desired period of time, and problems caused by sudden connection of the clutch device can be eliminated.

In addition, in this invention, the rod, valve body, and spring member, which are newly added members to the conventional clutch release cylinder, can all be housed in the conventional fluid chamber, so the axial length of the clutch release cylinder becomes longer. There is no problem with in-vehicle compatibility. Further, since the number of added members is small and their shapes are simple, the structure does not become complicated and processing and assembly are not complicated.

(Embodiment) Hereinafter, embodiments of the present invention will be described based on the drawings. Fig. 1 shows a clutch release cylinder according to a first embodiment of the invention, and Fig. 2 shows a clutch release cylinder according to a first embodiment of the invention. A hydraulic clutch mechanism incorporating a cylinder is shown.

In this clutch mechanism, a clutch release cylinder 10 is connected to a release fork 21 attached to a clutch cover of a clutch device (not shown), and communicates with a master cylinder 23 via a hydraulic line 22. As a result, when the clutch pedal 24 is depressed, the master cylinder 23
Hydraulic oil is discharged from the clutch release cylinder 10 and flows into the clutch release cylinder 10.
is activated and the release fork 21 is pushed to disconnect the clutch device. Furthermore, when the clutch pedal 24 is released from the clutch pedal in this state, the hydraulic fluid that has flowed into the clutch release cylinder 10 via the release fork 21 is returned to the master cylinder 23 due to the spring force built into the clutch device, and the clutch is released. The release cylinder 10 is returned to its original position and the clutch device is brought into the connected state.

As shown in FIG. 1, the clutch release cylinder 10 has a cylinder body 11, a piston 12, and a push rod 13 as its main components, each of which constitutes a valve mechanism, which is the main part of the present invention.

The cylinder body 11 has a cylindrical shape integral with the mounting bracket, and has an inlet hole 11b at one end of an inner hole 11a and an opening 11c at the other end. A hydraulic conduit 22 connected to a master cylinder 23 is connected to this inflow hole 11b via a union joint. The piston 12 is fitted into the inner hole 11a of the cylinder body 11 so as to be slidable in the axial direction, with a pair of front and rear seal rings 14a and 14b fitted therein. This piston 12
is provided with an engaging recess 12a on the other end side, and the inner end of the push rod 13 is engaged with this engaging recess 12a. The push rod 13 is opened at the opening 11 with the inner end of the dust cover 15 fitted on the outer periphery of the outer end of the push rod 13 fitted on the outer periphery of the other end of the cylinder body 11.
c, and is connected to the piston 12 by engaging the engagement recess 12a with its inner end. This results in
The piston 12 is located in the inner hole 11a of the cylinder body 11.
A hydraulic oil chamber R is formed at one end thereof, and is biased toward the other end by a conical spring 16 interposed in this hydraulic oil chamber R. The push rod 13 is urged toward the outer end by this urging force, and its outer end is engaged with and connected to the release fork 21 of the clutch device.

However, in this embodiment, the piston 12
A guide rod 17 is provided protruding from one end side.
The guide rod 17 constitutes a valve mechanism together with the valve body 18 and the coil spring 19, and protrudes coaxially with the inflow hole 11b of the cylinder body 11 by a predetermined length and faces the inflow hole 11b. Valve body 18
As shown in FIGS. 1 and 3, it has a substantially trapezoidal shape, and is assembled so as to be movable in the axial direction on the guide rod 17. This valve body 18 forms an annular orifice 18a between the inner circumference of its inner hole and the outer circumference of the guide rod 17.
It is movable until it comes into contact with the distal end stopper portion 17a of No.7. The coil spring 19 is the valve body 1
8 and the piston 12, and when the clutch release cylinder 10 is not in operation, the valve body 18 is resiliently seated on a valve seat 11d provided on the inner end side of the inflow hole 11b of the cylinder body 11. . In this state, the inflow hole 11b is closed by the valve body 18 and communicates with the hydraulic oil chamber R only through the orifice 18a.

In the clutch release cylinder 10 constructed in this manner, the valve body 18 is seated on the valve seat 11d by the biasing force of the coil spring 19 in the state shown in FIG. 1 when the clutch release cylinder 10 is not in operation.

When the clutch pedal 24 is depressed in this state, the hydraulic oil discharged from the master cylinder 23 is supplied to the inflow hole 11b of the cylinder body 11.
As shown in FIG. 4a, the valve body 18 is pushed against the coil spring 19 to separate from the valve seat 11d and flow into the hydraulic oil chamber R. Therefore, the piston 12 slides a predetermined amount toward the other end as shown in FIG. 4b, and during this sliding, the stopper portion 17a
The valve body 18 is locked and moved together, and the release fork 21 of the clutch device is pushed through the push rod 13. As a result, the clutch device is disconnected.

Next, when the depression of the clutch pedal 24 is released, the release fork 21 is pushed in the return direction by the spring force within the clutch device. Therefore, in the clutch release cylinder 10, the piston 12 is slid toward one end via the push rod 13, and the hydraulic oil in the hydraulic oil chamber R is returned to the master cylinder 23 through the inlet hole 11d. During this time,
At the initial stage of sliding of the piston 12, the valve body 18 is separated from the valve seat 11d as shown in FIG.
When the valve body 1 slides a predetermined amount, as shown in Fig. 5b, the valve body 1
8 is resiliently seated on the valve seat 11d. For this reason,
The inflow hole 11b is closed by the valve body 18 and communicates with the hydraulic oil chamber R only through the orifice 18a.
As a result, in the latter half of the sliding period after the piston 12 has slid a predetermined amount, the hydraulic oil slowly flows back through the orifice 18a and returns to the state shown in FIG. 5c.

Therefore, if the state shown in FIG. 5b is set when the clutch device starts connecting, and the state shown in FIG. It is possible to extend the half-clutch state for a desired period of time from when the clutch is engaged until the engagement is completed, thereby preventing the occurrence of problems such as engine stalling and wheel spin caused by sudden engagement of the clutch device, and improving the starting feeling. be able to. Furthermore, the above-described operation also reduces the impact when the clutch device is operated intermittently during upshifting and downshifting of the transmission.

However, the clutch release cylinder 10
In this case, the valve mechanism is connected to the guide rod 17 and the valve body 1.
8 and a coil spring 19, and the valve body 18 is provided with orifices 18a, 18b. For this reason, the valve mechanism has fewer constituent members and all of the constituent members are housed within the existing hydraulic oil chamber R, and the clutch release cylinder structure is not so complicated compared to the conventional one. There is no risk that vehicle mountability will be impaired due to an increase in the shaft length, and since the number of constituent members is small and the structure is not complicated, machining and assembling properties are also good.

(Modification) In the above embodiment, the guide rod 1
An orifice 18a is located between the outer circumference of the valve body 7 and the inner circumference of the valve body 18.
Although an example is shown in which an orifice 18b is provided in the valve body 18 itself, in the present invention, as shown in FIG. 6, an orifice 18b may be provided in the valve body 18 itself. In this case, the size, number, etc. of the orifices 18b are appropriately determined in relation to the duration of the half-clutch state.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a clutch release cylinder according to a first embodiment of the present invention, Fig. 2 is a schematic diagram of a hydraulic clutch mechanism incorporating the clutch release cylinder, and Fig. 3 is a line taken along the - line in Fig. 1. Figures 4a and 4b are schematic views showing the operation of the clutch release cylinder when the clutch pedal is depressed, and Figures 5a, b, and c are schematic diagrams showing the operation of the clutch release cylinder when the clutch pedal is released. 6 is a sectional view of a clutch release cylinder according to a second embodiment of the present invention. 10...Clutch release cylinder, 11...
Cylinder body, 11a...inner hole, 11b...inflow port, 11d...valve seat, 12...piston, 13
... Push rod, 16, 19 ... Spring, 17 ... Guide rod, 18 ... Valve body, 18
a, 18b...orifice.

Claims (1)

[Scope of utility model registration request] A cylinder body that has an inflow hole for fluid discharged from a master cylinder on one end side, and a cylinder body that is fitted liquid-tightly and slidably in the axial direction into an inner hole of the cylinder body and has an inflow hole for fluid discharged from the master cylinder on one end side of the inner hole. a piston forming a fluid chamber communicating with the master cylinder; and a piston passing through the other end of the cylinder body, the inner end of which is connected to the other end of the piston, and the outer end of the piston being connected to a release fork of a clutch device. In a clutch release cylinder equipped with a push rod, a rod of a predetermined length is provided on one end side of the piston and protrudes coaxially into the inflow hole,
A valve body that is removably seated on the valve seat provided on the inner end side of the inflow hole to close the inflow hole is assembled on the same rod so as to be movable by a predetermined amount in the axial direction, and a spring is applied toward the valve seat. 1. A clutch release cylinder, characterized in that the clutch release cylinder is biased and includes an orifice provided in the valve body to communicate the inflow hole and the fluid chamber.