JPS6120333Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a clutch release cylinder on a clutch housing or transmission case of an automobile or the like.

The power of the automobile engine is transmitted to the transmission via the clutch, but when the clutch is engaged and engaged by a hydraulic release mechanism, the clutch release cylinder of this release mechanism is usually connected to the clutch housing or the transmission. Attached to the mission case. However, it has been confirmed through experiments that this clutch housing or transmission case reaches a temperature of 100°C to 150°C, although this varies depending on driving conditions. Therefore, the temperature of the clutch release cylinder is also approximately the same. Since the clutch release cylinder is continuously used in this temperature environment, there have been problems such as poor durability and a tendency to malfunction due to thermal deterioration of internal rubber parts.

In view of the above points, an object of the present invention is to provide a clutch release cylinder support structure in which heat conduction from the clutch housing or transmission case to the clutch release cylinder is small, that is, the temperature rise in the clutch release cylinder is small. .

Next, the configuration of the present invention will be specifically explained based on the embodiments shown in the accompanying drawings.

As shown in FIG. 1, an automobile power unit consists of a cylinder block 21, a clutch 22, and a transmission 23.
A clutch release cylinder 1, which is a component of the hydraulic clutch release mechanism, is fixed, for example, to an attached portion 2' of the outer wall of the clutch housing 2 of the clutch 22 with a bolt 3. In this clutch release cylinder 1, an internal release piston (not shown) is actuated by hydraulic pressure from a clutch master cylinder when a clutch pedal (not shown) is depressed, and the clutch is disengaged through a push rod 26 and a release fork 25. be.

The cylinder body 4 of the clutch release cylinder 1 is shown in more detail in FIG.
Mounting legs 6 are provided at two locations to be fixed to the attached portion 2' of the clutch housing 2 with bolts 3. Each of these mounting legs 6 is provided with an insertion hole 7 having a diameter somewhat larger than the outer diameter of the bolt 3. Further, on both sides of these mounting legs 6, an annular groove 10 is formed around the insertion hole 7, as shown in FIG. 3, which is a sectional view taken along the line -- in FIG. A heat insulating material 12 made of Bakelite or the like having a hole 11 having approximately the same diameter as the insertion hole 7 is integrally buried in these annular grooves 10 . In this state, the end of each heat insulating material 12 is
It slightly protrudes outward from both sides of the mounting leg 6. Note that the reference numeral 5 in FIGS. 1 and 2 indicates a dust boot that covers between the release cylinder 1 and the push rod 26.

Now, when the release cylinder 1 is installed in the state shown in FIG. are in contact with the clutch housing 2, and as a result both mounting legs 6 of the clutch release cylinder 1 are in contact with the clutch housing 2.
This means that the heat insulating material 12 is interposed between the attached portion 2' and the attached portion 2'. Therefore, direct heat conduction from the housing 2 to the release cylinder 1 and heat conduction using the bolt 3 as a conduction path are small.
As a result, the temperature rise in the release cylinder 1 can be effectively suppressed.

Furthermore, since the heat insulating material 12 is integrally fixed to the clutch release cylinder 1 in advance, the troublesome work such as positioning that is inevitably involved when installing a separate heat insulating material is not necessary during installation.
Further, since the heat insulating material 12 is completely prevented from shifting due to vibrations during use, an ideal heat insulating state can be maintained at all times. Note that the temperature of the release cylinder is the same when the clutch release cylinder support structure of the above embodiment is practically applied using Bakelite as the heat insulating material 12, and in the case of a conventional support structure without a heat insulating material. As a result of measurement under operating conditions, the former was 108℃,
In the latter case, data of 132.5°C was obtained. As described above, by applying the clutch release cylinder support structure of this example, a temperature drop of approximately 25° C. was obtained, and the effectiveness of the heat insulating material 12 was fully verified.

Further, in the above embodiment, the heat insulating material 12 is attached to the mounting leg 6 of the clutch release cylinder 1, but in another embodiment, the heat insulating material is attached to the attached portion 2' of the clutch housing 2, and the heat insulating material is attached to the mounting leg 6 of the clutch release cylinder 1. It is also possible to use it as a completely separate body from the cylinder 1 and clutch housing 2. In addition,
It is clear that even in the case where the release cylinder 1 is attached to the transmission case, the same function as described above can be obtained by the heat insulating material 12.

As is clear from the above explanation, the present invention
A support structure for a clutch release cylinder, which is equipped with a mounting leg having a bolt insertion hole for fixing to the outer circumference of a clutch housing or transmission case via a bolt, the mounting leg having a mounting leg that is attached to the clutch housing or transmission case. An annular groove is provided on the outer periphery of the bolt and on the opposite side of the back of the bolt head, and an insertion hole and a through hole into which the bolt shaft can be inserted are provided in these annular grooves, protruding appropriately outward from the mounting leg. By integrally embedding annular insulation material with holes of approximately the same diameter, the insulation material is completely prevented from shifting due to vibrations during use, so ideal insulation function can be maintained at all times. This ensures that direct heat conduction from the clutch housing or transmission case to the clutch release cylinder, as well as indirect heat conduction through the bolt, is suppressed, and the piston inside the cylinder increases as the temperature of the clutch release cylinder increases. Since thermal deterioration of the cup and other sealing members is prevented, the durability of the clutch release cylinder is improved. Furthermore, in a configuration in which the heat insulating material is integrally fixed to the clutch release cylinder, which is a non-fixed object on the heat receiving side, the heat insulating material and the heat receiving side will inevitably be interposed when a separate heat insulating material is interposed by bolting. Since troublesome work such as mutual positioning of members is not necessary, there is an advantage that the installation work can be simplified and speeded up.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is a side view schematically showing the supporting state of the clutch release cylinder of an automobile, and Fig. 2 is an enlarged view of only the cylinder body of the clutch release cylinder shown in Fig. 1. The side view shown in FIG. 3 is a sectional view taken along the - line in FIG. 2. 1...Clutch release cylinder, 2...Clutch housing, 3...Bolt, 4...Cylinder body, 6...Mounting leg, 7...Insertion hole, 11...
Hole, 12...Insulation material.

Claims (1)

[Scope of utility model registration request] A support structure for a clutch release cylinder, comprising a mounting leg having a bolt insertion hole for fixing to the outer periphery of a clutch housing or transmission case via a bolt, the mounting leg having the clutch housing or transmission case. Annular grooves are provided on opposite sides of the outer peripheral part of the transmission case and the back side of the head of the bolt, and the shaft part of the bolt is inserted into these annular grooves in a state that appropriately protrudes outward from the mounting leg. 1. A support structure for a clutch release cylinder, characterized in that an annular heat insulating material having a hole approximately the same diameter as the insertion hole is integrally embedded therethrough.