JPS6349098B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a clutch device comprising a planetary gear mechanism.

[Prior art]

Conventionally, a hydraulic cylinder mechanism has generally been used to press and fix the clutch friction plate. When the piston of this hydraulic cylinder mechanism is formed into a ring shape, a very large pressing force can be applied to a narrow ring-shaped area even with a compact structure. However, forming the hydraulic cylinder mechanism into a ring shape like this requires complicated machining, and if precision machining is insufficient, oil leaks may occur, reducing the work efficiency of the hydraulic cylinder mechanism. be.

[Purpose of the invention]

An object of the present invention is to generate a strong pressing force with high work efficiency through a simple configuration with a small number of parts, without using a hydraulic cylinder mechanism that would complicate processing when formed into a ring shape. To provide a clutch device for a planetary gear mechanism that allows reliable clutch operation.

[Structure of the invention]

The clutch device of the present invention that achieves the above object has the following features:
A planetary gear mechanism is interposed between the input shaft and the output shaft, an internal gear of the planetary gear mechanism is set in an idle state, and a pressing plate is attached to the outer periphery of the internal gear,
A ring-shaped bellows, which expands and contracts when hydraulic oil is supplied and discharged, is opposed to this pressing plate via a friction plate that is movable in the axial direction, and the ring-shaped bellows is formed into a bellows shape having uneven folds on the inner and outer peripheries. and the ring-shaped bellows is supported in an unrestricted state in the circumferential direction, and when the ring-shaped bellows is expanded in the axial direction by supplying hydraulic oil, the friction plate is pressed against the pressing plate to fix the internal gear stationary, Further, when the internal gear is contracted by discharging the hydraulic oil, the pressing force of the friction plate is released from the pressing plate to enable the internal gear to rotate.

[Embodiments of the Invention] The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows a clutch device for a planetary gear mechanism according to an embodiment of the present invention. In this FIG. 1, 1 is a casing, and an input shaft 2 is provided on one side of the casing, and an output shaft 3 is provided on the other side, and a planetary gear mechanism 4 is installed between these two shafts 2 and 3. Intervening. A sun gear 5 is fixed to the end of the input shaft 2, and planet gears 6 are arranged around the sun gear 5 so as to mesh therewith. This planetary gear 6
is rotatably supported on a shaft 7a of a carrier 7 fixed to the output shaft 2. Further, a ring-shaped internal gear 8 meshes with the outer periphery of the planetary gear 6.

The internal gear 8 is not fixed to the casing 1 but is in a floating state, and has a pressing plate 8a attached to its outer periphery. A friction plate 9 faces the pressing plate 8a, and a ring-shaped bellows 10 is provided on the back side of the friction plate 9. The friction plate 9 meshes with a spline 11 formed on the inner surface of the casing 1, and slides in the axial direction in a non-rotating state. Also,
The ring-shaped bellows 10 has its inner and outer circumferences unrestrained, and is fixed in this state via a supply pipe 12 installed inside the casing 1, and hydraulic oil is supplied and discharged from the supply pipe 12. There is. By supplying and discharging this hydraulic oil, the ring-shaped bellows 10
Expansion and contraction are performed toward the friction plate 9 as described later.

As shown enlarged in FIGS. 2A and 2B, the ring-shaped bellows 10 has uneven folds 10 along the circumferential direction on the outer circumferential surface and the inner circumferential surface of the ring, respectively.
a, 10b, and has a bellows shape. When hydraulic oil is supplied into the ring-shaped bellows 10, it expands while stretching the pleats 10a and 10b with only the support surface side facing the casing 1 and the side facing the friction plate 9 in FIG. 1 being restrained. The friction plate 9 is moved and pressed toward the press plate 8a of the internal gear 8.

Due to the pressing action of the ring-shaped bellows 10 as described above, the floating internal gear 8 is firmly clamped and fixed with the outer peripheral pressing plate 8a between the friction plate 9 and the casing 1, and becomes stationary. Therefore, the power of the input shaft 2 is transmitted to the output shaft 3 via the planetary gear mechanism 4.
The deceleration is transmitted to the clutch and the clutch is engaged.

On the other hand, when the supply of hydraulic oil is released in the clutch-on state, the ring-shaped bellows 10 returns to its original position by its own elastic recovery force.
Therefore, the friction plate 9 separates from the pressing plate 8a, and the internal gear 8 returns to the idle state and rotates freely. Therefore, the transmission of power from the input shaft 2 to the output shaft 3 is cut off, resulting in a clutch-off state.

Note that the clutch device of the above embodiment has a configuration in which power is input from the input shaft 2 and output from the output shaft 3, so it is a reduction clutch due to the structure of the planetary gear mechanism 4. Reverse the direction of input and output, input from the output shaft 3 side,
If the output is output from the input shaft 2 side, it can be used as a speed increasing clutch.

Since the ring-shaped bellows 10 described above has uneven folds 10a and 10b along the circumferential direction on the outer and inner peripheries, it is possible to increase the expansion and contraction stroke in the axial direction (direction perpendicular to the surface direction of the ring). This enables reliable clutch on/male operation. Furthermore, if necessary, the above folds 10
By increasing the number of elements a and 10b and the number of friction plates 9, the extension and contraction stroke will be further increased, and the on/off operation of the clutch will be ensured.

In addition, the ring-shaped bellows 10 needs to withstand the internal fluid pressure when expanded, and automatically recover elastically to the original contracted state when the internal fluid pressure is released, so steel is the most suitable material for its construction. Although preferred, other materials can be used as long as they have the strength to withstand the internal fluid pressure.

In the clutch device of the planetary gear mechanism described above, the pressing force generation mechanism is composed of a ring-shaped bellows 10 having uneven folds along the circumferential direction on the inner and outer peripheries, so it does not work like a conventional hydraulic cylinder mechanism. It does not require precise machining and can generate pressing force with high work efficiency without oil leakage. Moreover, since the inner and outer peripheries of the ring-shaped bellows 10 are substantially unrestricted and act directly on the friction plate 9, the number of parts is extremely small and the mechanism is extremely simple.

〔Effect of the invention〕

As described above, the clutch device of the planetary gear mechanism of the present invention puts the internal gear of the planetary gear mechanism interposed between the input shaft and the output shaft into an idle state, and presses the outer periphery of the internal gear. A plate is attached to the press plate, and a ring-shaped bellows having uneven folds on the inner and outer peripheries is opposed to the press plate via a friction plate that is movable in the axial direction as a press mechanism, so the pressing force can be increased. Even with the ring-shaped structure, there is no reduction in work efficiency due to oil leakage, unlike in conventional hydraulic cylinder mechanisms. Further, since the hydraulic actuation mechanism is a ring-shaped bellows and is not a cylinder and a piston that are closely slidably fitted to each other, expensive precision machining to prevent oil leakage is not required.

Furthermore, the ring-shaped bellows has a bellows-like inner and outer circumference, and the inner and outer circumferences are in an unrestricted state, so the axial expansion and contraction stroke is very large. to ensure that the internal gear remains stationary. Therefore, the on/off operation of the clutch can be ensured. Moreover, since the ring-shaped bellows is supported in an unrestricted manner on its inner and outer peripheries, the number of parts can be reduced, thereby making the device mechanism extremely simple.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a planetary gear mechanism clutch device according to an embodiment of the present invention, FIGS. 2A and 2B show an example of a ring-shaped bellows used in the clutch, and FIG. 2A is a longitudinal sectional side view. FIG. 2B is a front view showing only the right half. 1...Casing, 2...Input shaft, 3...Output shaft, 4
...Planetary gear mechanism, 5...Sun gear, 6...Planetary gear,
7...Carrier, 8...Internal gear, 8a...Press plate, 9
...Friction plate, 10...Ring-shaped bellows.

Claims (1)

[Claims] 1. A planetary gear mechanism is interposed between the input shaft and the output shaft, the internal gear of this planetary gear mechanism is set in an idle state, and a pressing plate is attached to the outer periphery of the internal gear, and the shaft is attached to the pressing plate. Ring-shaped bellows, which expand and contract when hydraulic oil is supplied and discharged, are opposed to each other through friction plates that are movable in various directions. The ring-shaped bellows is supported in a restrained state, and when the ring-shaped bellows is expanded in the axial direction by supply of hydraulic oil, the friction plate is pressed against the pressing plate to fix the internal gear stationary, and the internal gear is contracted by discharging the hydraulic oil. 1. A clutch device for a planetary gear mechanism, characterized in that when the pressing plate is released from the pressing plate, the internal gear can be rotated.