JPH0126904Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a device that transmits the rotational torque of an input shaft to the output side, and the rotation of the output side is stopped the moment the torque transmission is interrupted. The clutch that was made
This brake device is interposed between the drive source of a power lawn mower and the cutting blade, and is used to instantly stop the rotating cutting blade by means of a brake when the clutch is disconnected. This relates to a device that performs

[Conventional technology]

Generally, this type of clutch/brake device is
For example, as shown in Japanese Patent Application Laid-Open No. 59-37344,
A rotary body that protrudes from the mounting plate of the lawn mower body and attaches the cutting blade to the drive shaft of the engine equipped with a clutch disk is rotatably provided, and a lining plate is installed between the rotary body and the clutch disk in the axial direction of the drive shaft. The clutch is movable and rotatable together with the rotating body, and a clutch spring is provided between the rotating body and the lining plate to press the clutch lining fixed to the lining plate against the clutch disk. A pressure plate is provided between the mounting plate and the clutch disk so as to be movable in the axial direction of the drive shaft, and a brake spring is compressed between the pressure plate and the mounting plate. urging the pressure plate toward the rotating body and bending the outer peripheral edge of the pressure plate located outside the outer peripheral edge of the clutch disk toward the rotating body;
This outer peripheral edge is brought into pressure contact with the brake lining fixed to the lining plate, and the lining plate is spaced apart from the clutch disk.

Then, by rotating the cam plate connected to the operating rod, the pressure plate is moved in the mounting play direction against the biasing force of the brake spring, and the lining plate is clutched by the biasing force of the clutch spring. The blade is moved toward the disc and the clutch lining of the lining plate is brought into pressure contact with the clutch disc to rotate the cutting blade. To stop the rotation, the operating rod is released and the cam plate is rotated in the counter-actuating direction and the blade is rotated. The shaft plate is moved toward the clutch disk, and while pressing the brake lining of the lining plate, the lining plate is separated from the clutch disk against the biasing force of the clutch spring to stop rotation.

[Problem that the invention attempts to solve]

However, in the case of the above structure, since the clutch lining and the brake lining are each fixed to the lining plate, when these linings wear out, the device must be disassembled and the lining plate replaced with a new one. For this reason, the work required time and effort.

Therefore, an object of the present invention is to provide a clutch/brake device that facilitates the lining replacement work.

[Means for solving problems]

In order to achieve the above object, the present invention fixes a driving member to an input shaft that transmits the rotational torque of a rotating machine such as a rotating motor or an internal combustion engine, which is a driving source, and further rotates a driven member at the tip side of the input shaft. An operating cam panel is disposed between the rotating machine and the driving member so as to be able to switch a predetermined angle, and an operating cam panel is disposed between the operating panel and the rotating machine in the axial direction of the input shaft of the rotating machine. A pressure plate with a diameter larger than the operation cam disk is provided so that it can be moved in the axial direction of the input shaft by a guide member, but cannot be rotated in the circumferential direction. A brake torque receiving surface is formed in a circumferential shape on a surface facing the driving member outside the periphery, and a lining is arranged between the driving member and the driven member so as to be movable in the axial direction of the input shaft and rotatable together with the driven member. A plate is disposed, and the lining plate has a clutch lining portion on a surface facing the drive member, and a brake lining portion provided on an outer peripheral edge extending from the clutch lining portion is pushed from the outer peripheral edge of the drive member. A lining member is removably provided between the brake torque receiving surface of the shear plate and the driving member, and the lining member is bent in the inner diameter direction of the driving member so that the brake lining portion faces the brake torque receiving surface, and the lining plate is driven. A clutch spring is compressed between the lining plate and the driven member, and is biased toward the member and engages the clutch lining portion of the lining member with the drive member when braking is not applied, while the pressure plate is attached toward the drive member. The pressure plate is pressed against the operating cam disk via the cam mechanism, and during braking, the brake torque receiving surface of the pressure plate is engaged with the brake lining part of the lining member, and the lining is applied via the brake lining part. A brake spring is disposed between the rotating machine and the pressure plate for pushing the plate toward the driven member against the clutch spring to interrupt the clutch connection between the driving member and the lining member. .

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a power lawn mower will be described with reference to the drawings. FIG. 1 is a sectional front view of the device of the present invention, with the left half showing the clutch engaged and the right half showing the clutch disengaged. FIG. 2 is an exploded perspective view of the device of the present invention.

A main body 1 of the lawn mower is provided with an engine mounting 2, and an opening 3 is opened on the inner periphery of the engine mounting 2. A rotating machine 4 is mounted and fixed to the engine mounting 2 from above, and an input shaft 5 for transmitting the rotational torque of the rotating machine 4 is vertically disposed downward.

The input shaft 5 is tapered 5a so that the diameter becomes smaller on the tip side, and has a female thread 5b extending in the axial direction from the tip.
is engraved, and a shaft-shaped collar member 6 is fitted onto this input shaft 5 and is vertically provided below. This collar member 6 has a fitting hole 6a tapered in the axial direction from the base end, into which the tapered input shaft 5 is inserted, a flange portion 6b formed on the outer periphery of the base end, and a bearing 7 provided on the rotating machine 4. The base end is supported by and rotates integrally with the input shaft 5. Moreover, this collar member 6 is
A key groove 6c and a taper 6d having a smaller diameter on the tip side are formed in the shaft portion, and the insertion hole 6 is formed from the tip side.
A bolt insertion hole 6e is formed to pass through a.

A flywheel 8 as a driving member is non-rotatably attached to the collar member 6 by a half-moon key 9 that fits into a keyway 6c of the collar member 6, and a part of the collar member through-hole 8a provided in the center. is formed into a tapered shape, and positioning and upward movement are restricted by engagement with the taper 6d of the collar member 6.

A bearing 10 is fitted to the lower part of the flywheel 8, that is, to the front end side of the collar member 6.A washer 11 is applied from the lower part, and a fixing bolt 12 is inserted into the bolt insertion hole 6e of the collar member 6 to secure the input shaft 5. It is screwed into the female thread 5b and holds the flywheel 8 and bearing 10.

A driven member 13 is fixed to the bearing 10 and rotatably supported by the collar member 6, that is, the input shaft 5. This driven member 13 has a flange portion 13 at the center that is secured to the upper surface of the bearing 10.
a and an inner circumferential wall 13b in the axial direction of the collar member 6 that is attached to the outer surface of the bearing 10 from the flange portion 13a, and extends outward from the lower end of the inner circumferential wall 13b so as to be orthogonal to the axial direction of the collar member 6. It is bent to form a mounting plane 13c in a substantially planar shape, and on this mounting plane 13c, a spring seat 13d is provided on the upper surface in close proximity to the inner peripheral wall 13b, and a cutting blade (not shown) is provided around the lower surface. It has a bolt hole 13e.

A lining plate 14 is disposed between the flywheel 8 and the driven member 13 so as to be movable and rotatable in the axial direction of the collar member 6. The lining plate 14 has a through hole 14a formed in the center so as to be loosely mounted on the outer periphery of the inner peripheral wall 13b of the driven member 13, and a spring seat 14b on the inner peripheral edge of the lining plate 14. 6
After bending downward in the axial direction of the collar member 6, planar lining member attachment portions 14c are formed which are perpendicular to the outer circumferential direction and the axial direction of the collar member 6, and the arcuate lining member 15 is bent downward in the axial direction of the collar member 6. Two are installed.

This lining member 15 has a flywheel facing surface 15a as a clutch lining portion, and an outer peripheral edge 15 extending from the clutch lining portion 15a.
b is bent upward in the axial direction of the collar member 6 along the outer circumferential edge of the flywheel 8 at a position outside the outer circumferential edge of the flywheel 8, and the tip of the outer circumferential edge 15b is bent on the upper surface of the flywheel 8.
The brake lining part 15 is bent in the inner diameter direction of the brake lining part 15.
c and is formed into a U-shaped cross section, and a clutch lining 16 is attached to the clutch lining portion 15a.
A brake lining 17 is fixed to each brake lining portion 15c in an arc shape, and is attached to cover the flywheel 8 from the outer circumferential side of the flywheel 8.

Further, the clutch lining portion 15a is provided with two female screw holes 15d, and the support pin 18 inserted into the support pin insertion hole 14d formed in the mounting portion 14c of the lining plate 14 is screwed into the female screw hole 15d. By doing so, the lining member 15 is attached to the lining plate 14.

Further, the tip of the support pin 18 is connected to the driven member 13.
The lining member 15 and the lining plate 14 are provided so as to be movable in the axial direction of the collar member 6 and rotate integrally with the driven member 13. There is.

A clutch spring 19 is compressed between the spring seat 13d of the driven member 13 and the spring seat 14b of the lining plate 14, and urges the lining plate 14 in the direction of the flywheel 8, so that the lining member 15 is compressed when not braking. clutch lining 1
6 is engaged with the clutch connection surface on the lower surface of the flywheel 8 to effect clutch connection.

A retainer 20 is screwed onto the rotating machine 4 with a collar member 6 loosely inserted therein, and an operation cam disk 21 is disposed on the retainer 20 between the rotating machine 4 and the flywheel 8 so as to be rotatable to change a predetermined angle. ing. This operation cam board 21 has a stepped portion 20 of the retainer 20 on the inner peripheral edge.
A is formed with a flange portion 21a that engages with the washer 22, the outer periphery of which is bent downward in the axial direction of the collar member 6, and further perpendicular to the axial direction of the collar member 6 to form a flat portion 21b. , the lever portion 21c for attaching the operating rod (not shown) to the outer periphery is bent upward in the axial direction of the collar member 6, the tip is bent outward, and a bolt insertion hole 21d for attaching the operating rod is formed at the tip. Three ball clamps 23 are formed on the surface of the flat portion 20b facing the rotating machine 4, which become shallower in the direction of rotation in the clutch connection direction.

A pressure plate 24 is disposed between the rotating machine 4 and the operation cam board 21, and is movable in the axial direction of the collar member 6 by a guide member 25 installed in the rotating machine 4 in the axial direction of the collar member 6. In addition, the rotation is restricted. This pressure plate 2
4 has a larger diameter than the operating cam board 21, has an inner peripheral edge 24a loosely attached to the inner peripheral wall 21e of the operating cam board 21, and has a flat part facing the flat part 21b of the operating cam board 21 on the outer periphery of the inner peripheral edge 24a. 24b, the outer side of the flat portion 24b from the outer peripheral edge of the operation cam disk 21 is bent downward in the axial direction of the cover member 6, and the outer periphery is bent outward in a direction perpendicular to the axial direction of the collar member 6. A brake torque receiving surface 24c is provided on the surface of the lining member 15 provided on the lining plate 14 that faces the brake lining 17.
The brake lining 17 is configured to be able to slide into contact with the brake lining 17, and the operating cam disk 21 is rotated at a predetermined angle by an external force on a part of the peripheral wall 24d between the flat portion 24b and the brake torque receiving surface 24c. A window 2 through which the lever portion 21c is inserted so as to be rotatable for switching.
4e is formed. Pressure plate 24
A guide hole 24f through which the guide member 25 is inserted is bored in the flat part 24b of the brake torque receiving surface 2.
The brake torque transmitted from the guide hole 24f is transmitted to the rotary machine 4 via the guide member 25. In addition, a ball clamp 26 is formed on this plane portion 24b, corresponding to the ball clamp 23 of the operation cam board 21, and the ball clamp 26 becomes shallower in the direction of rotation of the operation cam board 21 in the braking switching direction. A cam ball 27 is provided between them to roll on each inclined surface, the pressure plate 24 is located at the lowest position when the cam ball 27 is at the deepest position of the ball clamps 23 and 26, and the lining plate 14 is located at the bottom when the cam ball 27 is at the deepest position of the ball clamps 23, 26. It is in a clutch disengaged state apart from the wheel 8 and engaged with the pressure plate 24, and this state is the initial position of the operating cam board 21.

A brake spring 28 is connected between the rotating machine 4 and the pressure plate 24.
The pressure plate 24 presses the cam ball 27 against the ball clamp 23 of the operation cam board 21 by the ball clamp 26, and the cam ball 2
7 is at the shallowest position of the ball clamps 23, 26, the pressure plate 24 is at the uppermost position, and the cam ball 27 is at the deepest position of the ball clamps 23, 26 by switching rotation of the operation cam board 21. When rolling, the pressure plate 24
is lowered against the clutch spring 19 by the biasing force of the brake spring 28, the brake torque receiving surface 24c comes into sliding contact with the brake lining 17, and further pushes the brake lining 17.
The clutch connection between the flywheel 8 and the lining member 18 is interrupted. Therefore, a double brake spring 28 is used so that the spring force is stronger than that of the clutch spring 19.

Next, the operation of this embodiment will be explained. When the cam ball 27 is located at the deepest part of the ball clamps 23 and 26, the brake spring 28 is extended by the set load as shown in the right half of FIG. 2
4, the operating rod (not shown) is at the initial position, while the lining plate 14 is at the brake torque receiving surface 24c of the pressure plate 24.
The clutch spring 1 is pressed through the brake lining 17 of the lining member 14 by
9 is contracted, and the clutch lining 16 is separated from the flywheel 8 without contacting it. Therefore, the rotational torque of the flywheel 8 rotating from the input shaft 5 via the collar member 6 is not transmitted to the driven member 13, and the cutting blade (not shown) remains stationary and the rotating machine 4 Maintains idling operation.

Next, when the cutting blade is to be rotated, a cable (not shown) connected to an operating rod (not shown) is pulled, and the operating cam board 21 is rotated by a predetermined angle. At this time, the cam ball 27 is connected to the ball clamp 23,
Both clamps 23,
26, thereby the pressure plate 24 moves away from the operation cam board 21,
It is guided by the guide member 25 of the rotating machine 4 and rises without rotating, and is moved toward the rotating machine 4 against the brake spring 28. Along with this movement, the lining plate 14 moves the clutch spring 19
Due to the spring force of the brake lining 17 and the torque receiving surface 24c of the pressure plate 24, the brake lining 17 and the torque receiving surface 24c of the pressure plate 24 follow each other and move toward the flywheel 8 side, and the clutch lining 16 of the lining plate 14 comes into contact with the flywheel 8. Then, the lining plate 1 is dragged by the rotation.
4 begins to rotate while slipping, resulting in what is called a half-clutch state. Further, as the pressure plate 24 rises, the clutch spring 19 expands and the clutch lining 16 is pressed against the flywheel 8.
The rotational force increases, and when the pressure plate 24 moves further upward, the brake lining 17 separates from the brake torque receiving surface 24c of the pressure plate 24, and the braking state is canceled.
The lining plate 14 begins to rotate together with the flywheel 8, and the clutch is connected as shown in the left half of FIG. As a result, the input shaft 5
The rotational torque is transmitted to the driven member 1 through the collar member 6, flywheel 8, and lining plate 14.
3 and rotates the cutting blade.

If you release the cable, pressure plate 2
4, the cam ball 27 is connected to the ball clamps 23 and 26
The pressure plate 24 rolls in the deepest direction by the restoring force of the brake spring and is pushed downward in FIG.
7 and starts braking, and the brake torque is transferred from the brake lining 17 to the brake torque receiving surface 24.
c, and is transmitted from the pressure plate 24 to the rotating machine 4 via the guide member 25, and pushes the lining plate 14 downward to separate the clutch lining 16 from the flywheel 8, and the lining plate 14 and flywheel 8
This brakes the rotation of the lining plate 14 and stops the rotation of the cutting blade.

By repeating the above action, the clutch lining 16 is fixed to the lining member 15.
When the brake lining 17 is worn out, the lining member 1 can be removed by rotating the support pin 18 from the lower surface of the driven member 13 and removing the support pin 8 from the female threaded hole 15d of the lining member.
5 from the lining plate 14, and a new lining member 15 is mounted from the outer peripheral side of the flywheel 8 and attached using the support pins 18.

[Effect of idea]

As described above, in the present invention, the lining member to which the clutch lining and brake lining are fixed is provided in a removable manner on the lining plate.
Both linings can be easily replaced when they become worn.

[Brief explanation of the drawing]

FIG. 1 is a sectional front view showing one embodiment of the device of the present invention, with the left half showing the clutch in the engaged state and the right half showing the clutch in the disengaged state, and FIG. 2 is an exploded perspective view. 4... Rotating machine, 5... Input shaft, 6... Collar member, 8... Flywheel, 13... Driven member, 14... Lining plate, 15... Lining member, 15a... Clutch lining part,
15c... Brake lining part, 16... Clutch lining, 17... Brake lining,
18... Support pin, 19... Clutch spring, 21... Operation cam board, 23, 26... Ball clamp, 24... Pressure plate, 24
c... Brake torque receiving surface, 25... Guide member,
27...cam ball, 28...brake spring.

Claims (1)

[Scope of utility model registration request] An input shaft that transmits the rotational torque of a rotating machine serving as a drive source, a drive member fixed to the input shaft, and a drive member that is disposed closer to the tip of the input shaft than the drive member and is rotatable with respect to the input shaft. a driven member provided therein; an operating cam board disposed between the rotary machine and the driving member so as to be rotatable by changing a predetermined angle in the circumferential direction; and between the operating cam board and the rotating machine; A guide member installed in the rotating machine in the axial direction of the input shaft allows the input shaft to move in the axial direction but not to rotate in the circumferential direction. a pressure plate having a circumferential brake torque receiving surface on a surface facing the driving member; and a pressure plate disposed between the driving member and the driven member so as to be movable in the axial direction of the input shaft; a lining plate that is rotatably supported integrally with the lining plate; a clutch lining portion that is removably provided on the lining plate and that faces the driving member; and a clutch lining portion that drives an outer peripheral edge extending from the clutch lining portion; A lining that is bent from the outside of the outer peripheral edge of the member toward the rotating machine, and further bent in the inner diameter direction of the drive member between the brake torque receiving surface of the pressure plate and the drive member to form a brake lining part. a clutch spring that biases the lining plate toward the drive member and engages a clutch lining portion of the lining member with the drive member when braking is not applied; The pressure plate is pressed against the operating cam disk via a cam mechanism, and during braking, the brake torque receiving surface of the pressure plate is engaged with the brake lining portion of the lining member, and the lining member is connected to the clutch via the brake lining portion. A clutch/brake device comprising a brake spring that is pushed toward a driven member against a spring to break the clutch connection between the driving member and the clutch lining.