JPS62258234A - Clutch braking device - Google Patents

Abstract

PURPOSE:To enable the timing of a conversion from a brake operating state to a clutch engaged state to be kept constant all the time by providing an input hub in such a manner that it may be free to slide with respect to an output shaft, and then fixing a brake plate on the body so that the position of a brake surface is kept unchanged. CONSTITUTION:On an output shaft 12 extended from the body 10 is provided a spline external tooth 40, and then, with the spline external tooth 40 is spline- engaged a roughly cylindrical input hub 42 so that it may be free to slide along direction of the axis. With the peripheral portion of a friction facing 46a in the radial direction of a hub flange 44 is in pressed contact the brake surface 62a of a brake plate 62. The brake plate 62 is fixed on the boss part 10a of the body 10 by means of a bolt 64. Accordingly, the position of the brake surface 62a can be kept unchanged, and the change over point between the brake and the clutch can be kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to a clamp that transmits one force of glue on the BloJ side to the driven side, and when the clap performs a cutting operation, the [11
This relates to a clutch/brake HIT that combines a brake that stops rotation.

(Prior art and its problems) A conventional example of this type of device is shown in FIG.
55731 is known.

In Figure 3, 1o is the main body (fixed) of the L engine, for example.
A human horn hub 14 is fixed to an output shaft 12 extending from the main body 10 with a half-moon key 16. An intermediate plate 18 having a friction facing 18a is provided opposite to the input hub 14, and the intermediate plate 18G is slidable in the axial direction with respect to the output hub 2o. The output hub 20 is fixed to the input horn hub 14 via a bearing 22, and a pressure spring 24 is interposed between the output hub 20 and the intermediate plate 18. A cutter is fixed to the output hub 20 with bolts (not shown).

A brake plate 28 is brought into pressure contact with the friction facing 18a, and the brake plate 2B is slidable in the axial direction by an operating device 30 and a ball 32.

Therefore, the brake plate 28 is connected to the friction facing 18a.
In the illustrated state in which it is in pressure contact with the output hub 20, the output hub 20 stops,
The brake plate 28 slides in the direction of the main body 10 and I? When the rough facing 18a is in pressure contact with the input hub 14, the output @
The IJ force from 12 is transmitted to output hub 20.

However, in the above conventional example, the brake number 28 that stops the output hub 200 rotations slides in the axial direction, so the timing at which the brake is applied to the output hub 20 is not constant.
There is a problem in that the switching points of the clutch and brake change.

(Object of the Invention) In order to solve the problems as mentioned above, the present invention provides a clutch/play 1 device that can prevent the clutch/play 1 switching point from fluctuating. .

(Structure of the Invention) (1) Technical Means The present invention forms spline external teeth on the output shaft protruding from the main body of the engine, and provides a substantially cylindrical input hub that engages with the spline external teeth so that lFi can freely move. A substantially circular hub flange is formed that extends outward in the radial direction of the input hub, and an intermediate plate with a larger diameter than the hash flange is installed opposite the non-wooden side of the hub flange. The output hub, which holds the output hub in a state where it cannot move in the axial direction, is installed on the output shaft using a bearing to prevent axial movement. , and an annular one facing the hash flange of the intermediate plate. A friction member is fixed, and a brake plate is provided which is pressed into contact with a portion of the friction member radially outward from the hub flange and fixed to the main body, and a brake plate is provided between the hub flange and one main body of the engine in response to a lever operation by an operator. A switching mechanism is provided that interlocks and slides the input hub toward the friction member to press the hub flange against the friction member, and compresses the pressure spring to separate the brake plate from the friction member. This is a clutch/brake device.

(2) Since the working brake plate is fixed to the main body and the input hub is made slidable, the number of brakes and the timing at which the friction members come into pressure contact are approximately constant, and the switching points of the brake and clutch are maintained constant.

(Example) In FIG. 1 showing a clutch/brake device for, for example, a lawn mower, which employs the present invention, parts given the same reference numerals as those in FIG. 3 indicate the same or equivalent parts.

In FIG. 1, an output shaft 12 extending from a main body 10 is formed with spline external teeth 40. As shown in FIG. This spline external tooth 4
A substantially cylindrical input hub 42 is spline-fitted into the input hub 0, and the input hub 42 is slidable in the axial direction. A hub flange 44 extends outward in the radial direction of the input hub 42, and the surface of the hub flange 44 on the side opposite to the main body 10 is connected to the clutch 1I.
It has become I144a.

An intermediate plate 46 is provided opposite the clap surface 44a. The intermediate plate 46 is, for example, a press-formed annular member made of a steel plate. The intermediate plate 46 is set to have a larger diameter than the hub flange 44, and the rJIIPt facing 46a is fixed thereto by means of, for example, contact. A notch 46b is formed on the outer periphery of the intermediate plate 46, and a claw 48b of the output hub 48 is inserted into the notch 46b to connect the intermediate plate 46 to the output hub 48.
It allows only sliding in the axial direction, and is fitted in such a way that they rotate together in the circumferential direction.

The output hub 48 is also a press-formed annular member made of a steel plate, and an inner peripheral flange 488 on the inner peripheral portion of the output hub 48 fits into the bearing 50. Output hub 48 and middle 1m plate 46
A coil spring 52HF contact spring) is compressed at 0111, and the spring force of the coil spring 52 pushes the intermediate plate 46 in the direction of the main body 10.A bolt 54 is attached to the output hub 48. A cutter 56 for mowing the lawn is fixed.

The bearing 50 is fixed to the output shaft 12 with a collar 50a1 and a washer 50b in such a manner that sliding in the axial direction is prohibited. The washer 50b is bolted with a bolt 58. A return spring 60 is interposed between the collar 50a and the input hub 42.

F! A brake surface 62a of a route t&62 is in pressure contact with a radially outer peripheral portion of the friction rough 1 sink 46a from the hub flange 44. The brake plate 62 is also a press-formed steel plate annular member, and the brake plate 62 is attached to the boss portion 10 of the main body 10.
a with bolts 64.

A switching mechanism 66 is provided between the hub flange 44 and the main body 10. The switching mechanism 66 includes a fixed plate 68 and a ball 70.
, a rotary plate 72, a bearing 74, etc.
In detail, as will be described later, the bearing 74 presses the hub flange 44 to bring the clutch surface 44a to 11! It is adapted to be brought into pressure contact with the rubbing facing 46a.

In other words, the fixing plate 68 is fixed to the boss portion 10a at the outer peripheral portion with a bolt 76, and an annular groove 78 surrounding the ball 70 is formed in the radially intermediate portion. Annular! li
'i 78 is set to a predetermined thickness in the circumferential direction.

The rotating plate 72 has a substantially similar annular groove 8 which is substantially opposite to the annular groove 78.
0, and the ball 70 is surrounded by an annular groove 80. A lever 84 is connected to the rotating plate 72 with a rivet 82, and the rotating plate 72 is rotatable by the lever 84, which rotates in the circumferential direction in response to the operator's lever operation.

Therefore, when the rotating plate 72 rotates and the ball 70 is removed from the position of the annular groove 80, the rotating plate 72 is pushed by the ball 70 in the direction in the figure and slides. The intermediate tl 1246 is pressed to the right through the intermediate tl 1246. The switching device 1166 is described in detail in the aforementioned Japanese Patent Laid-Open No. 56-55731.

lI! of this intermediate plate 46 in the axial direction! ! ! 11fn is set to such a degree that it is possible to slide the intermediate plate 46 to the right in the figure against the spring force of the coil spring 52 from the brake operating state shown in the figure, and to separate the friction facing 46a from the brake surface 62a. .

Next, the effect will be explained. In the brake operating state illustrated in FIG. 1, the braking surface 62a of the brake plate 62 is r! Pm
! The clutch surface 44a is in pressure contact with the facing 46a, while the clutch surface 44a is separated from the am-f I-sink 46a, so that the intermediate plate 4
6 and an output hub 48 which rotates together in the circumferential direction is fixed by the frictional force of the mm facing 46a.

When the lever 84 is rotated in the circumferential direction by the operator's lever operation from the brake operating state shown in the figure, the rotating plate 72 slides to the right in the figure as described above, and the input signal is input via the bearing 74. Push the hub 42 to the right.

The input hub 42 slides to the right on the spline external teeth 40,
Eventually, the clutch surface 44a of the hub flange 44 comes into pressure contact with the friction facing 46a, and the power from the output shaft 12 begins to be transmitted to the intermediate plate 46 and the output hub 48.

Furthermore, when the hub flange 44 moves to the right, the coil spring 52 is compressed and the intermediate plate 46 moves to the right by the amount of compression. This movement of the intermediate plate 46 causes the brake surface 62a of the brake plate 62 to separate from the friction facing 46a,
The brake operation is released, and at the same time, the pressure contact of the clutch surface 44a to the friction facing 46a is completed, and the brake operation state is switched to the clutch connected state.

(Effects of the Invention) As explained above, in the clutch/brake device according to the present invention, the input hub 42 is 1F with respect to the output shaft 12! Since the brake plate 62 is fixed to the main body 10 to prevent the position of the brake surface 62a from changing, the first
The timing of switching from the brake operating state shown in the figure to the clap-connected state can always be maintained constant, and the brake plate 28 (Fig. 3) slides in the axial direction from the play 1 to the clutch as in the conventional case. There is no change in the switching timing, and it is possible to prevent the idle rotation plate from lowering or stalling due to load movement on the engine.

(Another Embodiment) (1) The present invention is not limited to the embodiment shown in FIG. 1 above. For example, as shown in FIG. , a minute gap δ is provided between the bearing 74 and the hub flange 44, and in the illustrated braking operation state, the bearing 74
It is also possible to stop the bearing 74 and extend the life of the bearing 74.

Incidentally, FIG. 2 shows different embodiments above and below with the center 151O in between.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a clutch/brake device for a lawn mower adopting the present invention, Fig. 2 is a longitudinal sectional view showing another embodiment of the invention, and Fig. 3 is a structural schematic diagram showing a conventional example. It is. DESCRIPTION OF SYMBOLS 10... Main body, 12... Output shaft, 42... Input hub, 44... Hub flange, 46... Intermediate plate, 48
...Output hub, 62...Brake plate, 66...Switching mechanism Patent applicant: Daikin Seisakusho Co., Ltd. Representative Patent attorney: Tadataka Oshiki l Figure 3

Claims (1)

[Claims] Spline external teeth are formed on the output shaft protruding from the main body of the engine, a substantially cylindrical input hub that is slidably engaged with the spline external teeth is provided, and a substantially disc-shaped input hub that extends radially outward of the input hub is provided. A hub flange is formed, an intermediate plate with a larger diameter than the hub flange is provided opposite to the side opposite to the main body of the hub flange, and an output hub that holds the intermediate plate while allowing movement in the axial direction is output using a bearing. The shaft is provided so as not to move in the axial direction, a pressure contact spring is provided between the output hub and the intermediate plate to press the intermediate plate toward the hub flange, and an annular friction member is fixed to the surface of the intermediate plate facing the hub flange. A brake plate is provided which is in pressure contact with a portion of the friction member radially outward from the hub flange and is fixed to the main body, and between the hub flange and the engine body, the input hub is connected to the friction member in conjunction with the operator's lever operation. A clutch/brake device comprising a switching mechanism that presses a hub flange against a friction member by sliding the hub flange toward the friction member, and compresses a pressure spring to separate the brake plate from the friction member.