JPH0456573B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention comprises a transmission system configured to supply power from an output shaft of an engine to a machine traveling device and a cutting blade, respectively, and a brake acting on the output shaft. The present invention relates to a walk-behind lawn mower, in which the brake is linked to automatically perform a braking operation in accordance with the detection state of a sensor that detects a release state of a control handle.

[Conventional technology]

For safety reasons, the above walk-behind lawn mower automatically activates the brakes and stops the engine when you release your hand from the control handle, stopping the mower from moving and stopping the mowing blade drive. It is configured so that

Conventionally, in this type of walk-behind lawn mower, the brake has been used for braking while the cutting blade and the engine remain interlocked, resulting in the following disadvantages.

[Problem that the invention seeks to solve]

In other words, if the brakes are not effective due to the inertial movement of the mower blades and it takes a long time to stop the machine, or if the brakes are applied well regardless of the inertial movement of the mower blades, it may be necessary to apply a brake to a large machine with strong braking force. I needed to.

An object of the present invention is to make it possible to quickly stop an aircraft even with a relatively small brake.

[Means for solving problems]

A characteristic configuration of the present invention is that, in the walk-behind lawn mower described at the beginning, a clutch is interposed between the output shaft and the cutting blade that can freely connect and disconnect power transmission, and when the sensor enters the detection state, the clutch automatically The clutch is configured to be disengaged when the clutch is released, and its effects are as follows.

[Effect]

If you let go of the control handle while driving the traveling device and the cutting blade, the sensor will detect this, and the brake will automatically enter the braking state and the clutch will automatically stop. The state switches to the off state. As a result, the engine is stopped because the brake is applied directly to the engine output shaft, and the aircraft traveling system that is directly coupled to the output shaft is stopped. Since the clutch is in the disengaged state and the engine output shaft and cutting blade are separated, the engine will immediately stop when the brake is applied. At this time, the cutting blade tries to continue rotating due to inertia, but since the cutting blade is in contact with the lawn during work, it will stop rotating a short time after the engine stops due to contact resistance with the grass. It will be stopped.

〔Effect of the invention〕

Therefore, when the hand is released from the control handle, the movement of the aircraft is quickly stopped, making it possible to prevent problems such as the aircraft moving and colliding with obstacles when the handle is released. Moreover, since the inertial force of the cutting blade that rotates during the braking operation is not applied to the brake, there is an advantage that the brake can be made smaller with less braking force than the conventional structure.

Furthermore, as mentioned above, when the aircraft stops running,
The cutting blade rotates due to inertia, but in general, in this type of lawn mower, the cutting blade is covered by a housing for safety and to guide the wind blowing through the cut grass. It doesn't come into contact with anything.

〔Example〕

Figure 4 shows a walk-behind lawn mower. This lawn mower is equipped with an engine 5 on the top side of a cutting blade housing 4 which also serves as a body frame and which houses a cutting blade 3 that can freely rotate around a vertical axis, and a control handle 6 at the rear of the cutting blade housing 4. A pair of left and right front wheels 1, 1 and a pair of rear wheels 2, 2 are attached to the front and rear of the aircraft, and a pair of left and right front wheels 1, 1 and rear wheels 2, 2 are mounted on the front and rear of the aircraft, and the left and right rear wheels 2, 2 are connected from the output shaft 8 of the engine 5 to the left and right rear wheels 2, 2 [an example of an aircraft traveling system]. ] is configured to supply power to drive the machine body, and is also configured to transmit power from the output shaft 8 to the cutting blade 3 to rotationally drive the cutting blade 3 to perform lawn mowing work.

A brake 24 acting on the output shaft 8
In addition, a clutch 23 is interposed between the output shaft 8 and the cutting blade 3, which can freely connect and disconnect power transmission, so that when the control handle 6 is released during work traveling,
It is configured such that the brake 24 is automatically operated and the clutch 23 is disengaged. In detail, as shown in FIG. 1, the lower end of the driving side cylindrical shaft 10 is externally fitted onto the engine output shaft 8 disposed inside the cutting blade housing 4 in the vertical direction of the machine and is interlocked with the key 9. A clutch drive-side disk 12 is fitted onto the cylinder shaft 10 so as to be relatively rotatable through a bearing 11, and a clutch driving-side disk 13, which also serves as a brake rotation side disk, is fitted onto the intermediate portion of the cylindrical shaft 10, and is connected to the key 9. It is externally fitted so that it rotates integrally when engaged and slides up and down by the action of the keyway 13a, and is raised so as to be separated from the driven side disk 12 by a spring 14. It is in force. A brake fixed side disk 16 is externally fitted onto the upper end of the cylindrical shaft 10 via a bearing 15 so as to be relatively rotatable, and is externally fitted onto the cylindrical shaft 10 via a bearing 17 so as to be relatively rotatable and slidable. A plurality of upward tongue pieces 18a are provided on the outer periphery of the disk fixing device 18, each penetrating the fixed side disk 16 from the lower surface side to the upper surface side so as to be vertically movable, and the tongue pieces 18a... Part 18a...
...The upper end of each disc is engaged with a member 19 fixed to the cutting blade housing 4 so as to be able to slide only up and down, and the tongue portion 18a is inserted through the disk periphery of the through hole 20 as shown in FIG. Although the fixed side disk 16 is allowed to rotate within a set range determined by the directional length, it is configured to prevent further rotation. A ball cam 21 is provided between the fixture 18 and the stationary disc 16 so that the fixture 18 can be slid up and down by the rotation of the stationary disc 16. It is connected to a cutting blade attachment 22 so as to rotate together with the blade 3, and in turn constitutes a clutch 23 for the cutting blade 3 and a brake 24 for stopping the engine 5.

That is, the operation is attached to the fixed side disk 16 so as to rotate integrally therewith, and is urged to the first operation position A by the elastic restoring force of the spring 14 and the action of the ball cam 21. When the arm 25 is in the first operating position A, as shown in FIG. The fixing device 18 is moved so that the cylinder shaft 10 and the cutting blade 3 are in an interlocking cut state so that they rotate relative to each other, and the fixed side disk 16 does not rotate together with the driving side disk 13. By being supported by the fixed member 19 via the drive side disk 13, frictional braking is applied to the driving side disk 13 so that the driving load on the engine 5 increases and engine stop occurs. When the operating arm 25 is swung to the second operating position B, the fixture 18 is lowered together with the bearing 17 by the ball cam 21, and the spring 14 is moved through the bearing 17, as shown in FIG. While compressing and deforming, the drive side disk 13 is moved away from the stationary side disk 16 and lowered so as to come into pressure contact with the driven side disk 12, and the brake is released, and the cylinder shaft 10 and the cutting blade 3 are integrated. It is frictionally linked so that it rotates.

An operating lever 27 linked to the operating arm 25 via a release wire 26 is urged to swing around the axis 19 and to a first operating position (OFF) by the spring 14. It is pivotally connected to the control handle 6 as shown in FIG. When the operating lever 27 is in the first operating position (OFF), the operating arm 25 is in the first operating position A, and when the operating lever 27 is in the second operating position (ON), the operating arm 25 is in the first operating position A. 25 is the second
The control lever 27 is configured to be in the operating position B, and the operating lever 27 is gripped and operated together with the operating handle 6 to operate the operating lever 27 to the second operating position (ON). The brake 24 is gripped and operated while the brake 24 is released and the clutch 23 is maintained in the engaged state.

In other words, just by letting go of the control handle 6,
When the operating lever 27 is set to the first operating position (OFF), the clutch 23 is automatically disengaged so that the inertial rotation of the cutting blade 3 is not transmitted to the cylinder shaft 10, and the brake 24 is automatically set to the braking state. When the time comes, the engine 5 is stopped, the traveling of the machine is stopped, and the drive of the cutting blade 3 is also stopped.

[Another example]

In place of the operating lever 27, a switch is provided so as to be pressed while grasping the operating handle, and the release of the operating handle is detected by the switch releasing the pressing operation. Or, a configuration is adopted in which a pressure-sensitive sensor is installed on the operating handle to detect release of the handle when the pressure is released, and the drive mechanism for operating the brake and clutch is connected via the operating circuit. The present invention may be implemented by employing a configuration in which the switch or sensor is electrically linked so as to be automatically operated based on future information. Therefore, the operating lever 27 is referred to as a sensor 27 that detects the release state of the operating handle.

[Brief explanation of the drawing]

The drawings show an embodiment of the walk-behind lawn mower according to the present invention, and FIG. 1 is a sectional view of the clutch and brake;
FIG. 2 is a sectional view of the clutch and brake, FIG. 3 is a partially cutaway plan view of the clutch and brake, and FIG. 4 is a side view of the entire walk-behind lawn mower. 2...Traveling device, 3...Mowing blade, 5...Engine, 6...Control handle, 8...Output shaft, 23...
...Clutch, 24...Brake, 27...Sensor.

Claims (1)

[Claims] 1 A transmission system is configured to supply power from the output shaft 8 of the engine 5 to the aircraft traveling device 2 and the cutting blade 3, respectively, a brake 24 is provided that acts on the output shaft 8, and a state in which the control handle 6 is released is detected. The walk-behind lawn mower is such that the brake 24 is linked to automatically perform a braking operation according to the detection state of the sensor 27, and the power transmission between the output shaft 8 and the cutting blade 3 is intermittent. Flexible clutch 23
The walk-behind lawn mower is constructed such that the clutch 23 is automatically disengaged when the sensor 27 is in a detection state.