JPS6349010A - Reaping height regulation mechanism of lawn mower - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a cutting height adjusting device for a lawn mower.

(B) Prior art The cutting height adjustment mechanism of a conventional lawn mower was developed in U.S. Pat. No. 59-778.
As in the technique described in Japanese Patent No. 06, the height of the vehicle on the machine body side is constant, and the height of the mowing device is adjusted by moving the suspended mower device up and down.

However, in the case of this configuration, it is necessary to set the vehicle height on the machine side to the height of the maximum raised position of the mower device, and the vehicle height is constant and the center of gravity is always at a high position. It was not possible to safely climb the slope and reap the harvest without falling over.

(C) Problems to be Solved by the Invention The purpose of the present invention is to provide a lawn mower that can perform mowing work even on sloped terrain such as a golf course, so that the front wheels 1 and the rear wheels 2 are closer to the machine body. The cutting height of the mower device can be adjusted by vertical movement of the wheels.

When the front wheels 1 and the rear wheels 2 are moved up and down, the caster angle set for steering and the wheel base between the front end 1 and the rear wheels 2 change with the up and down movement, especially on the steering wheel side. This caused a problem in that the steering condition changed.

An object of the present invention is to provide a structure in which the caster angle and the wheel base between the front and rear wheels do not change even when the front wheels 1 are moved up and down to adjust the cutting height.

(d) Means for Solving the Problems The objects of the present invention are as described above. Next, the configuration for achieving the objects will be explained.

The front wheel 1 is used as a steering wheel, and the cutting height can be adjusted by moving the front wheel 1 itself up and down. It is movable and can be stopped at any position after the vertical adjustment.

In addition, the front wheels 1 and the steering gear box 20 are connected to the parallel link 1
1 and 12, and a mowing height adjustment rod 16 is arranged on a part of the parallel links 11 and 12,
It is connected to the fuselage side.

In addition, the steering drive mechanism 1 is located approximately parallel to the parallel links 11 and 12.
4 actuators 30 are arranged, and each rotation center is provided at approximately the same position on the aircraft body side.

Further, a universal joint 9 is disposed between the parallel links 11 and 12 to transmit power from the mission case M to the steering gear box 20.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

FIG. 1 is an overall side sectional view of the lawn mower of the present invention, FIG. 2 is a side view of the support portion of the front end 1, which is the steering wheel, and FIG. 3 is the arrangement of the parallel links 11 and 12 and the steering drive mechanism 14. FIG.

The overall configuration will be explained with reference to FIGS. 1 and 2.

The mower device is composed of a mower deck 3 and a rotating reaping blade 4. A deck frame 5 is arranged on the upper surface of the mower deck 3. An engine E is placed on the rear part of the deck frame 5, a transmission case M is placed on the center part, and a battery 13 is placed on the front part. Engine E
A shaft that transmits power into the mission case M and drives the rotary reaping blade 4 from the mission case M is projected from the mission case M into the mower deck 3 as a working machine drive shaft 23. A universal joint shaft 9 is also interposed to drive the front wheels 1, which are steering wheels, thereby transmitting power to the stationary gearbox 22. A steering gearbox 20 is disposed below the stationary gearbox 22.

A pair of left and right parallel links 11 and 12 that move the stationary side gearbox 22 up and down to adjust the cutting height are interposed between the mission case M and the stationary side gearbox 22.

Further, a steering drive mechanism 14 for steering and turning the front wheel 1, which is the steering wheel, is also pivotally supported at its base to the transmission case M by a joint 30a. Pivotal positions of parallel links 11 and 12 with respect to mission case M and steering drive mechanism 1
The position of the joint 30a, which pivotally supports the actuator 30 of No. 4 with respect to the mission case M, is substantially the same position when viewed from the side.

The steering drive mechanism 14 is composed of a forward/reverse motor, a screw rod, etc., and an actuator 30 expands and contracts. It is pivotally connected.

The rear part of the knuckle arm 21 is pivotally supported by a part of the stationary gearbox 22 by a knuckle arm shaft 28.
The front end engages a rotating arm pin 33 of a rotating arm 32 protruding from the steering gear box 20 into the elongated hole 21b. Since the axis 01 of the shaft 28, which is the center of rotation of the knuckle arm 21, and the axis 02, which is the center of rotation of the steering gear box 20, are not damaged, the knuckle arm 2
The steering gear box 20 is steered and rotated while absorbing the eccentric portion by the elongated hole 21b provided at the tip of the steering gear box 21 and the rotation arm pin 33.

Moreover, between the moadetsuki 3 and the parallel links 11 and 12,
A cutting height adjusting rod 16 and a cutting height adjusting pipe 15 are interposed, and the cutting height of the front wheels can be adjusted by changing the distance between the two using a pin.

The cutting height of the mower device is adjusted by adjusting the front wheels 1 using the cutting height adjustment pipe 15 and the cutting height adjustment rod 16, and by adjusting the upper and lower surfaces of the rear axle cases 18 and 19 with respect to the cutting height adjustment bracket 17. This is what we are doing.

Moreover, above between the pair of left and right parallel links 11 and 12,
The stationary side gearbox 220 input shaft and the universal joint 9 are interposed from the mission case M.

Also, bumper guards 6 and 7 are installed in front and behind the deck frame 5.
is installed protrudingly.

Further, the rear end 2 is provided on the left and right, and the rear axle cases 18 and 19 of the rear wheel 2 connect the front end to the transmission case M.
The rear end can be adjusted and fixed in a five-stage adjustment hole drilled in the cutting height adjustment bracket 17 with a pin.

The overall configuration as described above is covered by the bonnet 8. A warning light 10 for radio control is attached to the top of the bonnet 8.

In FIG. 3, the steering mechanism and cutting height adjustment mechanism of the front wheels 1, which are steering wheels, will be explained.

The fixed side gearbox 22 is bent in a shape, and has a universal joint 9 on the input shaft that protrudes toward the rear.
are connected. In this configuration, the steering gear box 20, the steering chain case 20a, and the front axle are configured in the shape of a mouth, and the center of steering rotation of the front end 1 is located exactly below the center of the king pin. There is.

As mentioned above, the knuckle arm shaft 28 , which is the center of rotation of the knuckle arm 21 , is located at the rear of the stationary gearbox 22 .
The kingpin, which is provided at a position offset from the center line of the input shaft and is the center of steering rotation of the front wheels l, also serves as a power transmission shaft passing through the inside of the fixed side gearbox 22 and the steering gearbox 20. That's what I'm doing. knuckle arm 2
1 and the rotation center 02 of the king pin do not coincide.

By intentionally making the rotation center 01 of the knuckle arm 21 and the rotation center 02 of the king pin not coincide with each other, the rotation angle of the knuckle arm 21 is made small, and the rotation angle of the steering gear box 20 is made large. This is what I did.

A rotating arm pin 33 of a rotating arm 32 protruding from the side of the steering gear box 20 is fitted into the elongated hole 21b, and the rotating arm pin 33 slides within the elongated hole 21b to avoid acid displacement. It is absorbed by

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

First, when the front wheel 1, which is a steering wheel, is moved up and down to adjust the cutting height, the caster angle of the front wheel 1 may change or the wheel pace of the front and rear wheels may change. In this case, the fixed side gearbox 22 is connected to the parallel link 11.
12, and the fixed side gearbox 22 connects the steering gearbox 20 and the front! Since I supported 1iii1,
Even when the cutting height is adjusted, the caster angle and wheelbase do not change.

Second, by arranging the cutting height adjustment pipe 15 and the cutting height adjustment rod 16 between the parallel links 11 and 12 and the machine body side, and adjusting the height of these with pins, the front wheels 1 are fixed. Support is provided by the cutting height 31 pipe 15 and the cutting height adjustment rod 16, and the structure is flexible and the cutting height is 81! The passages were easy.

Thirdly, by arranging the actuator 30 of the steering drive mechanism 14 in parallel with the parallel links 11 and 12, even if the parallel links 11 and 12 rotate, the front wheel 1 does not rotate to steer. There is none.

Therefore, the straight position does not change, and there is no need to adjust the knuckle arm 21 after adjusting the cutting height.

Fourthly, the universal joint 9 placed between the parallel links 11 and 12 extracts power from the transmission case M to drive the front wheels 1, so even when the front wheels make sharp turns, the lawn will not be damaged. There are few. It was possible to obtain sufficient pitching power even when mowing slopes.

[Brief explanation of the drawing]

FIG. 1 is an overall side sectional view of the lawn mower of the present invention, FIG. 2 is a side view of the support portion of the front wheel 1, which is the steering wheel, and FIG. 3 is the arrangement of the parallel links 11 and 12 and the steering drive mechanism 14. FIG. 1... Front wheel which is a steering wheel 11. 12... Parallel link 14... Steering drive mechanism 15... Cutting height adjustment pipe 16... Cutting height adjustment rod 20... Steering Gear box 21...Knuckle arm 22...Fixed side gear box 30...Actuator 32...Rotating arm 33...Rotating arm pin 01...Knuckle arm rotation center 02...Operation Center of rotation of gearbox E...Engine M...Mission case

Claims (4)

[Claims] (1) The front wheel is a steering wheel, and the cutting height can be adjusted by moving the front wheel itself up and down, and the front wheel and steering gearbox are rotated up and down around a pivot point on the machine A mowing height adjustment mechanism for a lawn mower, characterized in that the mowing height adjustment mechanism is movable and can be stopped at any position after the vertical adjustment. (2) The front wheels and the steering gearbox according to claim 1 are pivotally supported on the mission case by a parallel link, and a cutting height adjustment rod is arranged in a part of the parallel link, and connected to the fuselage side. A mowing height adjustment mechanism for a lawn mower, which is characterized by: (3) The actuator of the steering drive mechanism is arranged substantially parallel to the parallel link recited in claim 2, and each rotation center is provided at substantially the same position on the fuselage side. Lawn mower cutting height adjustment mechanism. (4) A mowing height of a lawn mower characterized in that a universal joint is arranged between the parallel links according to claim 2, and the power is transmitted from the mission case M to the steering gear box. Adjustment mechanism.