JPS6047613A - Clutch apparatus of self-propelling mower - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-propelled lawn mower, which allows the lawn mower to run on its own even when the cutting blade is stopped rotating.

Conventionally, in self-propelled lawn mowers, the driving force for rotating the cutting blades is used to drive the travel drive unit, and specifically, a drive unit is installed at the rotation eye F with respect to the drive shaft. The mower blade mounting portion is rotated through a clutch device, and the V pulley formed on the mower blade mounting portion and the pulley on the travel drive portion side are connected to PEL 1 to drive the travel drive portion. (For example, see Japanese Patent Publication No. 55-50642)
The structure is such that when the clutch device is operated to stop the rotation of the cutting blades, the mower itself also stops running.

Therefore, for example, when moving a lawn mower to another mowing area, it is necessary to manually move the lawn mower, which requires a lot of labor and inconvenience, especially in areas with many ups and downs.

This invention solves the above-mentioned conventional inconveniences.In particular, the present inventor has proposed a crudge device (patent application (Refer to No. 58-89703), its structure is such that a cutting blade handle part with a friction part is provided rotatably with respect to the drive shaft, and In a clutch device for a self-propelled lawn mower configured to alternately press a driving clutch plate and a brake fixed plate, the driving pulley of the lawn mower traveling drive section
It is characterized by being integrally formed on the drive shaft side.

Next, embodiments of the present invention will be illustrated below with reference to the drawings.

(C) is a cutting blade, which is bolted to a cutting blade attachment part (1) installed at the tip of a drive shaft (2).

The cutting blade attachment portion (1) is rotatably provided with respect to the drive shaft (2) via a bearing (11).

In addition, on the opposite side of the cutting blade (C>), there is a disc-shaped friction part (12).
is formed.

(3) is a clutch plate provided with its outer circumference facing the friction part <12), and is fitted into the drive shaft (2) so as to be able to rotate together with the drive shaft (2), and is fitted with a key (31). It's stopped. On the inner diameter side of this clutch plate (3), a V-groove pulley (32) for driving the lawnmower travel drive section (x) (see Figure 4) is integrally constructed, so that it can rotate together with the clutch plate (3). It has become. The clutch plate (3) is slidable in the axial direction, and normally,
It is separated from the friction part (12) by a return spring (33). (34) indicates a friction facing material.

(4) is an actuator, which has a pair of cam plates (4
1) A cam ball (42) is sandwiched between cam plates (41) and 4.
1) "The grooves are sandwiched between diagonal grooves <a><a r formed on mutually opposing surfaces and whose depths gradually change.

The actuator (4) has a bearing (45) (
The actuator (4) is fitted to the drive shaft ('2J) so as to freely rotate through the cam plate (45)' and is slidable in the axial direction.
(41)", the cam ball (42)
) and the diagonal recesses 1(a)(a)''.

One cam plate (41) of the above-mentioned actuator (4)
), an annular fixing plate (5) for use as a brake extends toward the am part (12) of the cutting blade attachment part (1), and the tip of this fixing plate (5) is , mower blade mounting part (
It is bent into a brim shape to face the friction part (12) of 1), and a friction facing U (5) is attached to the bent part.
1) is attached. Furthermore, an operating lever (L) for rotating the actuator (4) is connected to the outer circumferential portion of the fixed plate (5), and the operating lever (L) is a lever equipped on the handle of the lawn mower. (not shown) so that it can be rotated.

(6) is a V-belt that is wound around the pulley (32), the other end of which is wound around the pulley (P) on the lawn mower drive unit (X> side), and the other end is wound around the pulley (P) on the The above pulley (P
) side.

(7) is a pressure spring that constantly biases the actuator (4) toward the cooling part (12), and is a double inner and outer coil spring arranged in an appropriate number around the drive shaft (2). (11)(
71)', and a spring cover (72) provided opposite the actuator (4) connects the drive shaft (2
) is equipped around.

(8) is on the lawn mower main body side, and (9) is fitted on the drive shaft (2) and indicates an I (sleeve).

Next, to explain the operation of the clutch device, first, squeeze the lever on the lawn mower handle side together with the handle and pull the operating lever (L), then the cam plate (41) configured as a pair with this will rotate. Then, as mentioned above in 1c, the cam ball (42) and the diagonal concave d? .

(a) (Actuator is activated by cam action with aγ)
(4) will be heard on both sides. Then, the cam plate (41
)' pushes the clutch plate (3) downward, so that the clutch plate (3) touches the friction part (1) of the cutting blade handle (1).
12). At this moment, the fixed plate (5) extending from the cam plate (41) slides upward and the friction part (1
2), and the entire pressing force from the pressure spring (force) is applied to the abutting surface of the clutch plate (3) and the friction part (12), which press against the strong force of both, and the cutting blade (C) can be rotated (see Figure 2).

On the other hand, release the lever ~ on the lawnmower handle side and release the operating lever (
When the tension on L) is released, the actuator (4) returns to its original position by the pressure spring (7), so first the fixed plate (5) and the friction part (12) come into contact, and then the clutch plate ( 3) is pushed back upward by the spring (33), power transmission to the cutting blade (C) is cut off, and at the same time, the pressing force of the pressure spring (the blade is applied to the fixed plate (5) and the friction part (12) The cutting blade (C) can be braked rapidly by applying pressure to the contact surface of the cutting blade (C) and pressing the cutting blade (C) strongly.

Since the pulley (32) for driving the travel drive unit (X) is integrally formed with the clutch plate (3) on the drive shaft (a side), the travel drive unit (X) can be driven even when the cutting blade (C) is stopped rotating. part (X) can continue to be driven, allowing the lawn mower to run on its own at all times.In addition, to stop the lawn mower from running, for example, insert a tension pulley (T) in the middle of the V-belt (6). The V-belt can be loosened by rotating the V-belt with a manual operation such as the handle, and the pulley (32) can be rotated idly (see FIG. 4).

In addition, as a conventional clutch device for a self-propelled lawn mower, a clutch plate (3) on the drive shaft side is pressed against the cutting blade mounting part by a spring, and a single-push type suppression device using ball force l\ when braking rotation. is actuated to separate the clutch plate from the 11-contact part of the cutting blade handle against the spring pressure, and at the same time press the brake fixing plate to the cutting blade attachment part using the same pressing device to remove the cutting blade. The spring for pressing the upstream clutch plate and the spring for activating the pressing device and pressing the fixed plate were acting in a direction to cancel each other's spring pressure ( In the clutch device according to the present invention, the double-opening actuator (4) slides the clutch plate (3) and the fixed plate (5) in opposite directions to alternately move the friction portion. (12), the spring for pressure contacting the clutch plate (3) and the fixed plate (5) can be shared by the silicone spring (7), which causes the above-mentioned disadvantages in which the spring pressures cancel each other out. Since there is no spring pressure, the spring pressure is efficiently applied to the pressure contact surface, and the cutting blade can be rotated and moved quickly and reliably.

On the other hand, in the illustrated embodiment, in order to replace the V-belt (6), the holes 1 to (B) that fix the sleeve (9) must be replaced.
Loosen the blade mounting part (1) and the clutch plate (3) in the removal direction and pull them apart from the fixing plate ((G). From the gap created by this separation, remove the V-belt (6).
), and the belt can be replaced easily.

In addition to the above-described embodiment in which the pulley (32) is integrated with the clutch plate (3), there is also a case in which the pulley (32) is formed independently and integrated with the drive shaft (21 by means of a key, etc.). .

Further, as the pressure spring (7), a disc spring (73) may be used instead of the coil spring described above, as shown in FIG. 3. In this case, the disc spring (73) is connected to the drive shaft ( ), it can be easily installed by simply inserting it into the hole.

According to the clutch device for a self-propelled lawn mower according to the present invention configured as described above, the drive pulley (32) of the lawn mower travel drive section (X) is integrated with the drive shaft (2) side. Therefore, even when the cutting blade (C) has stopped rotating, the lawn mower itself can run on its own, and there is no need to manually pull the lawn mower when moving it to another location, for example. This means that the labor involved in sawing can be significantly reduced, making it particularly suitable for use in places with many ups and downs, such as golf courses.

In addition, there is no need to add a complex mechanism, the cost burden is small, the durability is good, and various other excellent effects can be exhibited.

[Brief explanation of the drawing]

The figures illustrate an embodiment of the present invention, and Fig. 1 is a sectional view when the cutting blade is braked, Fig. 2 is a sectional view when the cutting blade is rotating, and Fig. 3 is partially omitted due to modifications. The sectional view and FIG. 4 are schematic diagrams showing the state of power transmission to the travel drive unit. (1)...Mower blade attachment part, (12)...11?8 friction part, (2)...Drive shaft, (3)...Clutch plate, (4
)...Actuator, (42)...Cam ball, (5)...Fixing plate, (6)...V belt-1 (7
1... Pressure spring, (a) (a)'... Diagonal groove, (
C)...Mowing blade, <X>...Traveling drive unit. Patent applicant Isao Watanabe Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A cutting blade attachment part in which a friction part is formed is provided rotatably with respect to the drive shaft, and a clutch plate for driving and a fixed plate for brake are alternately attached to the friction part. A clutch device for a self-propelled lawn mower configured to press into contact with each other, characterized in that a driving pulley of a lawn mower traveling drive section is integrally formed on the drive shaft side. Device. 2. The clutch device for a self-propelled lawn mower according to claim 1, wherein the pulley is integrally formed with the clutch plate.