JPS6034554A - Clutch in planetary gear mechanism - Google Patents

Abstract

PURPOSE:To enhance the working efficiency and ensure the operation of a clutch by a structure wherein a pressing plate is annexed at the outer priphery of an internal gear and an annular bellows, which serves as a pressing mechanism, is opposed through an axially shiftable friction plate to the pressing plate. CONSTITUTION:A pressing plate 8a is annexed at the outer periphery of an inside gear 8, which is held in floating state, in a planetary gear mechanism 4. In addition, an annular bellows 10, the inner and outer peripheries of which are composed of corrugated walls, stands through an axially shiftable friction plate 9 against the pressing plate 8a so as to serve as a pressing mechanism. Because no oil leakage occurs under larger pressing force due to the structure as mentioned above, the working efficiency can be enhanced by increasing the pressing force. Further, the sure on-off operation of a clutch can be made possible with a simple structure.

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 flange friction plate. If 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 with a compact structure. However, forming the hydraulic cylinder mechanism into a ring shape like this requires complicated machining, and insufficient precision machining can cause oil leaks.
There is a problem in that the work efficiency of the hydraulic cylinder mechanism is reduced.

[Purpose of the invention]

The purpose of the present invention is to generate a powerful 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 latching operation.

[Structure of the invention]

A clutch device according to the present invention for achieving the above object includes a planetary gear mechanism interposed between an input shaft and an output shaft, and sets an internal gear of the planetary gear mechanism in an idle state. A pressing plate is attached to the outer periphery of the gear, and a ring-shaped bellows having uneven folds on the inner and outer peripheries is placed in an unrestricted state in the circumferential direction by interposing a friction plate that is movable in the axial direction on the pressing plate. The ring-shaped bellows is expanded and contracted by supplying and discharging pressurized fluid, and when the ring-shaped bellows expands, the pressing plate of the internal gear is pressed via the friction plate, and the internal gear which is in a free state is It is characterized by the fact that the gear can be fixed and stationary.

[Embodiments of the invention]

The present invention will be explained 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 by 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 a pressing plate 8a is provided on 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 carved on the inner surface of the casing 1,
It is designed to slide in the axial direction in a non-rotating state. Further, the ring-shaped rosette 10 has its inner and outer circumferences unrestrained, and is fixed in this state via a supply pipe 2 installed inside the casing l, and hydraulic oil is supplied and discharged from this supply pipe 12. It looks like this. By supplying and discharging the hydraulic oil, the ring-shaped rose 10 expands and contracts toward the friction plate 9, as will be described later.

As shown enlarged in FIGS. 2A and 2H, the ring-shaped rosette 10 has uneven folds 10a and 10b formed along the circumferential direction on the outer and inner circumferential surfaces of the ring, respectively. There is. When hydraulic oil is supplied into such a ring-shaped bellows 10, it expands while stretching the folds 10a and 10b with only the side supporting 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 suppressing action of the ring-shaped bellows 10 as described above, the internal gear 8 in the floating state is firmly clamped and fixed with the pressing plate 8a on the outer periphery between the friction plate 9 and the casing 1, and becomes stationary. Therefore, the power of the input shaft 2 is decelerated and transmitted to the output shaft 3 via the planetary gear mechanism 4, resulting in a state of thalassotion.

On the other hand, when the supply of hydraulic oil is released in the clutch-on state, the ring-shaped rose IO 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 freely rotates. Therefore, the transmission of power from the input shaft 2 to the output shaft 3 is cut off, resulting in a thalasso-off state.

In addition, in the clutch device of the above embodiment, since the configuration is such that power is inputted from the input shaft 2 and outputted from the output shaft 3, it is a deceleration clutch due to the configuration of the planetary gear mechanism 4. Reverse the direction of input and output, and connect the above output shaft 3.
If the input is made from the side and the output is made from the input shaft 2 side, it can be used as a speed increasing clutch.

Since the ring-shaped rosette 10 described above has uneven folds 10a and 10b along the circumferential direction on the outer and inner peripheries, the expansion and contraction stroke in the axial direction (direction perpendicular to the surface direction of the ring) can be increased. , thereby ensuring that the latch is turned on.

Enables off operation. Furthermore, if necessary, "2 arrangement 1
If the number of 0a, 10b and the number of friction plates 9 are increased, the extension/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 for the planetary gear mechanism described above, the pressing force generation mechanism is constituted by 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 made substantially unrestricted and act directly on the friction plate 9,
[Effects of the Invention] As described above, the clutch device for a planetary gear mechanism of the present invention has a very small number of parts and a very simple mechanism. At the same time, a pressure plate (1J) is installed on the outer periphery of the internal gear, and an uneven surface is formed on the inner and outer peripheries via a friction plate that is movable in the axial direction. Since a ring-shaped bellows with folds is used as a pressing mechanism and oriented in the J direction,
Even with the ring-shaped structure that can increase the pressing force, there is no reduction in work efficiency due to oil leakage, unlike in conventional hydraulic cylinder mechanisms. Furthermore, expensive precision machining is not required to prevent oil leakage. In addition, the ring-shaped hemlock has a structure in which the inner and outer peripheries are not constrained and presses directly against the friction plate, resulting in a simple structure with fewer parts and reliable on/off operation of the latch. do.

[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.
FIG. 2B is a front view showing only the right half. DESCRIPTION OF SYMBOLS 1...Casing, 2...Input shaft, 3...Output shaft, 4...Planetary gear mechanism, 5...Sun gear,
6... Planetary gear, 7... Carrier, 8... Internal gear, 8a... Pressing plate, 9... Friction plate, 1
0...Ring-shaped bellows, Agent: Patent attorney Nobuo Ogawa - Patent attorney: Ken Noguchi Patent attorney: Kazuhiko Saishita Figure 1 Figure 2

Claims (1)

[Claims] A planetary gear mechanism is interposed between the input shaft and the output shaft, and the internal gear of this planetary gear mechanism is in an idle state. A pressing plate is attached to the outer periphery of the internal gear, and the pressing plate has an axial direction. Ring-shaped bellows having uneven folds on the inner and outer peripheries are opposed to each other with their circumferential directions in an unrestricted state through a movable friction plate, and pressurized fluid is supplied and discharged to the ring-shaped bellows. The planetary gear is expanded and contracted by the ring-shaped hollow, and when the ring-shaped hollow is expanded, the pressing plate of the internal gear is pressed through the friction plate, so that the internal gear in a floating state can be fixed and stationary. Mechanism clutch device.