JPS6116432Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a clutch/brake device suitable for use in various equipment and devices including, for example, lawn mowers in which the cutting blade is rotationally driven by an engine, etc.
In particular, the present invention relates to improvements in clutch/brake devices equipped with a ball-type cam actuating mechanism.

[Conventional technology]

In general, this type of clutch/brake device is capable of properly and reliably transmitting the rotational torque of various rotary drive machines to the driven equipment side, and when necessary, the above-mentioned rotational torque can be transmitted quickly and reliably. Moreover, it is necessary to brake the rotation of the driven equipment to stop it at the moment of the interruption.

Various structures have been known as this type of clutch/brake device, and a typical example is US Pat. No. 4,141,439.
There is one with the configuration shown in the specification. To explain this briefly, this conventional device includes an input hub that is keyed onto the output shaft of an engine, etc., a driven member that faces the input hub and is movable in the axial direction at the tip of the output shaft, and The output hub is provided integrally with the driven member, and biasing means for biasing the driven member and the output hub toward the input hub. A cam actuating mechanism having a ball interposed between an annular member fixed to the machine frame side of the engine and a brake ring plate disposed on the output hub side of the engine, and protruding from the brake ring plate is provided. By loosely fitting the protrusion into the elongated hole formed in the operation lever, the brake ring plate can be rotated with respect to the fixed annular member using this lever, and thereby the cam operation mechanism and the cam operation mechanism are connected. The driven member and the output hub are caused to slide in the axial direction so as to move forward and backward relative to the input hub by the force means, and as a result, power is selectively transmitted from the input side to the output side or disconnected. It was said to have a similar structure.

[Problem that the invention attempts to solve]

However, according to the conventional device configured as described above, the driven member constituting the output-side rotating member is fitted to the front end side of the output shaft of the engine so as to be rotatably and slidably in the axial direction via a bearing and a biasing means. Since the output hub is integrally fixed to the outer end of this driven member with a bolt or the like, the axial length of the entire device is inevitably long due to its configuration. This has an impact on various devices and devices that employ this type of device, and has been a major problem in reducing the size of these devices and devices. Furthermore, in the above-mentioned configuration, in order to assemble the biasing means for biasing the driven member and the output hub toward the input hub, it is necessary to dispose a cover as a stationary side member in this part. It is necessary to interpose a bearing between the cover and the driven member, and the above-mentioned cover needs to be arranged with a strength that takes into account the resistance force against the pressing force of the urging means, and the structure is complicated and it is difficult to apply pressure. It had drawbacks such as problems in terms of quality and ease of assembly, leading to higher costs.

Further, in the above-mentioned conventional example, the ball type cam actuating mechanism is arranged on an annular member fixed to the machine frame side of the engine and having a groove portion inclined in the direction of rotation, and on an output hub side thereof opposite to the annular member. A brake ring plate having a groove inclined in the direction of rotation, a ball interposed in the groove of both of these members, and a machine frame connected to the brake ring plate through an arcuate long hole drilled in the annular member. Since it has an elongated hole into which a protrusion extending from the side is loosely fitted, and is comprised of an operating lever etc. that is pivotally attached to the fixed side, there have been problems as described below. That is, by rotating this operating lever, the brake ring plate that rotates integrally with the control lever frictionally engages with the output side driven member via the friction plate, thereby connecting and disconnecting the input hub and the output hub. In order to obtain the braking function with the brake ring plate that rotates together with the operating lever, when the brake ring plate is frictionally engaged with the rotating output side during braking, the rotation of this output side is prevented. If this is transmitted to the lever as rotational force and resonance occurs, this will lead to other problems.Moreover, in this case, the resistance against the lever shaft is also large, resulting in a lack of operational reliability. It was something that would happen.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to simplify the overall structure of the device and to significantly shorten its axial length.
In addition, the clutch connection and disconnection operations can be performed easily and reliably, and it is also possible to reduce the negative effects such as resonance on the operation side due to frictional engagement with the ball-type cam operating mechanism during driving and braking. The object of the present invention is to obtain a clutch/brake device that is also inexpensive.

[Means for solving problems]

In order to meet such demands, the clutch/brake device according to the present invention has an output side rotating member such as an output hub disposed on the outer periphery of an input hub provided on the output shaft of a rotary drive machine. Only the friction plate part, which is the braked part, is separated from the output hub so that it can slide freely in the axial direction, and the lever that moves the brake ring plate that connects and disconnects the input side and output side is operated by a ball type cam. The brake ring plate is installed on the other operation panel side of the mechanism, and the brake ring plate is configured to be able to slide only in the axial direction, with rotation in the rotational direction being restricted by bolts installed on the fixed part side. This is what I did.

[Effect]

According to the present invention, the friction plate movably provided on the output hub side is biased and pressed against the input hub side, resulting in a clutch connected state, and rotation is transmitted from the input hub side to the output hub side. At the same time, by rotating the lever on the operation panel and using the action of the ball-type cam operating mechanism, the brake ring plate is brought into contact with the friction plate and separated from the input hub side against the biasing force, thereby shutting off the clutch. The rotation transmission from the input side is cut off, and at the same time, the rotation on the output hub side is braked and stopped.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

Figures 1 to 4 show the clutch according to the present invention.
This figure shows an example of a brake device, and in these figures, reference numeral 1 indicates various rotary drive machines such as engines and step motors, 2 indicates an output shaft thereof, and a bearing 3 is mounted on the output shaft 2. A substantially annular operation panel 4 is rotatably fitted in a concentric manner through the operation panel 4, and an operation lever 5 extending radially from a part of the outer circumference of the operation panel 4 is connected to the output shaft 2 within a predetermined angular range. It is configured so that it can be rotated. In addition, in the figure, 1a is a machine frame to which the rotary drive machine 1 is attached, and 6 is a casing that surrounds the outer circumference of the above-mentioned output shaft 2 at a predetermined interval. The operating lever 5 extends outside the device and is configured to be manually operable from the outside.

Then, on the output shaft 2 mentioned above, there is a clutch
An input hub 7 constituting a brake device is fixed by fitting its boss portion 7a, and a flange portion 7b extending in the radial direction is integrally formed at the end on the machine frame 1a side. Its inner surface faces the operation panel 4 at a predetermined distance.

Reference numeral 8 denotes an output hub formed by rotatably supporting the boss 8a concentrically on the boss 7a of the input hub 7 via a bearing 9 on the outer circumference of the outer end thereof;
A spline tooth portion is formed at the inner end of the boss portion 8a extending in the axial direction of the output hub 8 on the side of the machine frame 1a.
A clutch plate 10, which constitutes a friction plate that faces the flange portion 7b and moves forward and backward relative to the flange portion 7b, is fitted and held so as to be movable in the axial direction. here,
The output hub 8 serves as an output side rotating member, is connected to a rotating part of a driven device (not shown), and has a radially extending flange 8b at its outer end. is provided with nuts and the like to be connected to various driven devices.

The lower half of the inner surface (machine frame 1a side) of the clutch plate 10 constituting the friction plate described above is located near the outer periphery of the flange portion 7 of the input hub 7.
The friction plate 10, to which a friction piece 11 facing the flange 8b of the output hub 8 is fixed, is constituted by the clutch plate 10 having the friction piece 11.
By the pressing force of the compression coil spring 12 interposed as a biasing means for biasing the friction plate toward the input side (the flange portion 7b side of the input hub 7), the It is configured such that it is pressed in the opposite direction and is pressed against and frictionally engaged with the flange portion 7b of the input hub 7.

Reference numeral 13 denotes a fixing bolt (only one bolt is shown in FIG. 1) which is screwed onto the machine frame 1a of the rotary drive machine 1 on the outside of the operating panel 4 in the radial direction and has a collar 14 fitted around its outer periphery. Although shown in the diagram, usually
(They are arranged equidistantly at three locations in the circumferential direction at 120° intervals), and on the collars 14 on the outer periphery of these bolts 13, there are bolts that allow displacement in the axial direction and prevent rotation in the circumferential direction. A brake ring plate 15, which is biased toward the machine frame 1a in a regulated state, is disposed through the hole 15aa. In addition, 1 in the figure
Reference numeral 5b denotes a coil spring interposed between the brake ring plate 15 and the casing 6 in order to bias the brake ring plate 15 toward the operation panel 4 side. And this brake ring plate 15
is configured to face the upper half of the friction piece 11 constituting the output side rotating member on the outside of the flange portion 7b of the input hub 7, and to move forward and backward relative to the upper half of the friction piece 11. That is, the above-mentioned brake ring plate 15 is disposed facing the operation panel 4 at a predetermined interval, and a ball 16 is disposed between these two members 4 and 15.
A ball-type cam actuation mechanism is provided, which includes inclined grooves 17 and 18 formed on opposing surfaces of both members to be inclined in the circumferential direction.

By the action of this ball type cam operating mechanism, the brake ring plate 15 moves forward and backward relative to the friction piece 11 on the output side as necessary. When the clutch plate 10 (friction plate) having the friction piece 11 is moved to the side and comes into contact with it, the clutch plate 10 (friction plate) having the friction piece 11 is separated from the input side to create a clutch disconnected state in which rotation transmission is interrupted, and conversely, the flange portion of the input hub 7 7b, the friction piece 11 constituting the friction plate is released from its movement restriction and moved toward the flange portion 7b of the input hub 7 by the biasing force of the compression coil spring 12. By pressing, the output side is connected to the input side, resulting in a clutch connected state.

In this embodiment, the friction plate is constructed by attaching a friction piece 11 to a portion near the outer periphery of the clutch plate 10, and the friction piece 11 contacts the flange portion 7b of the input hub 7 and the brake ring plate 15 as appropriate. Although the above-mentioned clutch is configured to connect and disconnect, the present invention is not limited to this, and if the clutch plate 10 itself constituting the friction plate has the same function as the friction piece 11, This friction piece 11 may be omitted.

Here, the specific configuration and operating state of the above-mentioned ball-type cam operating mechanism will be explained in detail with reference to FIGS. 2 to 4. A brake ring plate 15 disposed opposite to the brake ring plate 15 and both members 4, 1
It is constituted by inclined grooves 17 and 18 formed at a plurality of locations in the circumferential direction on the opposing surfaces of 5, and a ball 16 interposed between these grooves. This ball 16 is equivalent to a normal bearing ball, and is fitted into the above-mentioned inclined grooves 17 and 18, respectively. Note that the above-mentioned inclined grooves 17, 1
As shown in FIGS. 2 and 3, 8 is an inclined groove whose groove depth becomes shallower toward the opposite end, and as is clear from FIG. 4,
Each groove bottom is formed in a tapered shape such that the groove width gradually decreases from the deep end toward the shallow end.

In the clutch/brake device using the ball-type cam actuating mechanism configured as described above, the connection and disconnection state of the clutch is determined by the ball 1.
It is determined by the axial position of the brake ring plate 15 with respect to the operation panel 4, which is determined by the positional relationship within the grooves 17 and 18 of No. 6. That is, the aforementioned operating lever 5
The operation panel 4, which is rotated by rotating it to the extreme positions in both the left and right directions, changes its rotation position relative to the brake ring plate 15 whose rotation is regulated. The brake ring plate 15 can be moved forward and backward toward the friction plates 10 and 11 on the outer periphery of the flange portion 7b of the input hub 7, thereby achieving the above-mentioned operating state of clutch engagement or clutch disengagement. For example, in the state shown in FIG.
Since the bottom of the groove is located at a shallow position, resulting in the state shown in FIG. 3, the brake ring plate 15 is pushed to the left in FIG. 1 and is pressed against the friction plates 10, 1 on the output side. It operates to separate this from the input side against the biasing force of the compression coil spring 12.
Further, in FIG. 4, when the operation panel 4 is rotated clockwise in the figure, the ball 16 is rotated as shown in FIG.
is interposed at a deep position at the bottom of both grooves 17 and 18,
The brake ring plate 15 is separated from the friction plates 10 and 11 and is located closer to the operation panel 4 than the flange portion 7b of the input hub 7, as shown by the broken line in FIG. 1. As a result, the friction plates 10 and 11 It is pressed against the flange portion 7b of the input hub 7 by the biasing force of the compression coil spring 12, and rotational torque is transmitted from the input side to the output side. In this state, when the operation panel 4 is rotated in the opposite manner to that described above, the brake ring plate 15, whose rotation is regulated, is pressed against the friction plates 10 and 11 again, and is separated from the input side. , serves to cut off the rotational torque transmission and at the same time brake the rotation on the output side.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part may be modified and changed as appropriate. For example, the number and arrangement positions of the fixing bolts 13, etc., which movably support the brake ring plate 15 in the axial direction for connecting and disconnecting the clutch, can be selected as necessary. The clutch connection and disconnection state due to the movement of the brake ring plate 15 are determined by the fixed distance between the operation panel 4 and the input hub 7, the axial thickness of the input hub 7 and the brake ring plate 15, the diameter of the ball 16, and the grooves 17, 18.
This can be obtained by appropriately selecting the groove depth, etc.

[Effect of idea]

As explained above, the clutch according to the present invention
According to the brake device, an output side rotating member such as an output hub is disposed on the outer periphery of an input hub provided on the output shaft of a rotary drive machine, and only the friction plate that becomes the braked part is connected by spline fitting. The lever is separated from the output hub and is slidable in the axial direction while applying a biasing force toward the input side, and the lever that moves the brake ring plate that connects and disconnects the input and output sides is operated by a ball type cam. The structure is such that it can slide only in the axial direction, with rotation in the rotational direction being regulated by a bolt provided on the other operation panel side of the mechanism and further provided on the brake ring plate fixing part side. Therefore, despite the simple and inexpensive configuration, the axial length of the entire device can be significantly shortened, and the operation member side is reduced by frictional engagement with the ball-type cam actuating mechanism during driving and braking. It has various excellent practical effects, such as being able to reduce the resonance at a level that causes no practical problems and improving the operational reliability of various parts.

[Brief explanation of the drawing]

The drawings show one embodiment of the clutch/brake device according to the present invention, in which FIG. 1 is a schematic side sectional view of the whole with a part cut away, and FIGS.
The figure is an enlarged sectional view of the main part showing the relative displacement of the operation panel and the brake ring plate by the ball-type cam operating mechanism, and FIG. 4 is an enlarged view of the main part taken along the - line in FIG. 1. DESCRIPTION OF SYMBOLS 1...Rotary drive machine, 2...Output shaft, 3...Bearing, 4...Operation panel, 5...Operation lever, 7...Input hub, 7a...Boss part, 7b...Flange part,
8...Output hub, 8a...Boss part, 9...Bearing,
10...Clutch plate (friction plate), 11...Friction piece, 12...Compression coil spring (biasing means), 13
... Fixing bolt, 15 ... Brake ring plate, 16 ... Ball, 17, 18 ... Inclined groove.

Claims (1)

[Scope of utility model registration request] An operation panel 4 is rotatably fitted on the output shaft 2 of the rotary drive machine 1 via a bearing 3 and is rotatably operated within a predetermined angle range, and an operation panel 4 is arranged so as to face the outside in the radial direction of the operation panel 4. Machine frame 1 of the rotary drive machine 1
A brake ring plate 15 is supported by a bolt 13 fixed to a to allow displacement in the axial direction and is biased toward the machine frame 1a, and the opposing surfaces of the operation panel 4 and the brake ring plate 15. The inclined grooves 17 and 18 formed in the respective inclined grooves 17 and 18
A ball-type cam actuating mechanism consisting of a ball 16 interposed between the two members 4 and 15 while being fitted into the inner part of the brake ring plate 15; flange portion 7b extending to
and an input hub 7 as an input-side rotating member having a boss portion 7a that is rotatably mounted on the output shaft 2, and a boss portion 7 of the input hub 7.
a A boss part 8a rotatably fitted on the outer circumferential part via a bearing 9 and having a spline tooth part formed at the end on the flange part 7b side of the input hub 7, and a boss part 8a extending radially outward at the other end side. An output hub 8 having a flange portion 8b provided therein, a friction member fitted to the spline tooth portion thereof and facing the brake ring plate 15 and the flange portion 7b of the input hub 7 so as to be movable forward and backward from the opposite side of the operation panel 4. The plates 10, 11 and the friction plates 10, 11 are attached to the flange portion 7 of the input hub 7.
A clutch/brake device characterized in that it is equipped with an output side rotating member constituted by a biasing means 12 that biases toward the b side.