JP2514739Y2 - Engine control device for tractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an engine control device for a tractor that controls a governor of an engine by rotating an operating lever.

[Conventional technology]

In general, the engine control device of the tractor, when the manual operation lever is rotated within a predetermined range, the end portion of the lever plate extended to the operation lever contacts the stopper pin fixed to the mounting plate, The rotation of the operating lever was restricted.

[Problems to be solved by the device]

However, by rotating the operating lever manually,
The engine governor is controlled by the wire attached to the lever plate that extends to the end of the operating lever. However, since the tractor generally works on soft soil, if the wheels slip, or if the wheels stop due to some obstacle, the operating lever is operated with an excessive operating force. Occasionally, the mounting plate to which the stopper pin is fixed may deform the mounting plate or the outer holder for fixing the wire due to the shocking contact between the lever plate and the stopper pin, and the operation of the wire may become unsuccessful. There is a problem that the rotation range of the operation lever is displaced and the governor of the engine cannot be controlled in a predetermined manner. Further, since the stopper pin and the outer receiver are formed as separate members and fixed to the mounting plate, the processing cost is high.

[Means for solving the problem]

The present invention is intended to solve the above problems, and a technical means taken by the present invention is to provide a tractor that controls a governor of an engine by rotating an operating lever provided in a driver's seat. , A bracket that erected from above and to the left and above of a connecting member that connects the engine and the rear mission case, and a boss portion that holds the pedal shaft is installed above the bracket, and a mounting plate having a horizontal surface portion on the boss portion of the bracket A wire for fixing and forming a recess in a part of the horizontal plane, rotatably providing the base end of the operation lever around the horizontal in the recess, and connecting a lever plate extending from the operation lever to the governor. The rotation range of the operating lever is regulated by connecting the end portion of the lever plate to the rising portion of the recess of the mounting plate. It is characterized by being used as a stopper.

[Function of device]

According to the present invention, when the driver turns the operation lever, a recess is formed in a part of the mounting plate having a horizontal surface fixed to the boss portion holding the pedal shaft of the bracket erected from the connecting member of the tractor. The base end portion of the operation lever is rotatably provided in the recess, and the operation lever is provided with a wire connected to the tip of the lever plate extending from the base end portion, The lever is connected to the governor, and the tip of the lever plate contacts the rising portion of the recess, whereby the rotation of the operating lever is restricted and the engine speed is controlled within a predetermined range. Further, since the mounting plate is formed with the concave portion, the rigidity thereof is increased and problems such as deformation can be prevented.

〔Example〕

 An embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 4, the tractor 1 has a vehicle body 3 suspended by wheels 2, and an engine 4 and a flywheel cover 5 are arranged on the front portion of the vehicle body 3. . A driver's seat 6 is arranged at the rear of the vehicle body 3, and an operation lever 8 having a grip portion 8a is arranged on an operation panel 7 of the driver's seat 6. In FIG. 4, reference numeral 9 denotes a connecting member for connecting and fixing the flywheel cover 5 and the rear mission case 10 located below the rear portion of the vehicle body 3, and the connecting member 9 has a gear transmission installed in the flywheel cover 5. The main shaft, which is moved downward with respect to the engine crankshaft by the device, is inserted, and the upper surface of the connecting member 9 is substantially flush with the step surface 11, and the step surface 11
Forms a wide, flat resting surface. In addition, a main clutch (not shown) is provided at the front of the rear mission case 10.
Are arranged, and are linked by a wire or the like so as to interlock with the operation of the clutch pedal which will be described later. And the rear mission case 10 changes the rotation transmitted from the main shaft to the gear shift lever.
At 12, the speed is changed to an appropriate rotational speed and transmitted to the wheels 2. 13
Is a drive shaft transmitted to the front wheels 2.

Further, 14 is a steering wheel, 15 is a driving seat, and 16 is a clutch pedal.

In the operation lever 8 arranged on the operation panel 7 of the driver's seat 6, a bracket 17 having a boss portion 19 for holding the pedal shaft 18 is erected on the connecting member 9, and the boss portion 19 has a horizontal surface portion. A mounting plate 20 is fixed, inserted into a hole 23 of a recess 21 formed in a part of the horizontal surface portion, and is rotatably locked around the horizontal surface portion.

A lever plate 22 extending from the base end of the operation lever 8 is fixed, and the operation lever 8 is inserted into the hole 23 through the friction plate 24 on the upper surface of the recess 21. A flat washer 25, a disc spring 26 compressed by a nut 28, and a flat washer 27 provide friction in rotation, and the wire 29 is inserted into a pin 30 fixed to the lever plate 22 and a wire 29 is a split pin 31. Be locked. The wire 29 connected to the lever plate 22 is snapped to the governor 32.
Are connected by Therefore, when the operation lever 8 is rotated, the end of the lever plate 22 comes into contact with the rising portion 21a of the recess 21.
Since the rotation range of the engine 4 is restricted, the rotation range of the governor bar 32 is also restricted and the engine 4 can be controlled to a predetermined rotation speed.

Outer 34 of the wire 29 on the lever plate 22 side
Is the cover mounting seat 35 that is integrally fixed to the mounting plate 20.
While being inserted into the notch 36 and screwed, the governor 32 side of the outer 34 is screwed to the outer stopper 37 of the engine 4. A windbreak partition plate 38 arranged between the engine room 4a and the driver's seat 6 is screwed to the cover mounting seat 35.

Since the present embodiment has the above-mentioned structure, the operation lever 8 is fixed so that the end of the lever plate 22 fixed to the base end of the operation lever 8 contacts the rising portion 21a of the recess 21 of the mounting plate 20. In the state where it is stopped and held at the maximum counterclockwise rotation range position, the governor 32 moves through the wire 29 linked to the lever plate 22 to the governor spring 32.
The engine 4 is controlled to a low speed by being stopped at the leftmost position in the rotation range by a. When the operation lever 8 is rotated in the clockwise maximum rotation range, the end portion of the lever plate 22 fixed to the base end portion of the operation lever 8 contacts the rising portion 21a of the recess 21 of the mounting plate 20. The governor 32 rotates in the arrow A direction against the governor spring 32 via the wire 29 connected to the lever plate 22 in the stopped and held state at the hit position, and the rightmost position in the rotation range. The engine 4 is controlled at high speed after being stopped. When the rotation of the operation lever 8 is stopped in the middle of its rotation range, the friction between the friction plate 24 and the disc spring 26 stops and holds the position, and the governor 32 rotates in the rotation position in synchronization with the operation lever 8. Then, the rotation of the engine 4 is maintained at the rotation speed corresponding to the rotation of the operation lever 8.

Reference numeral 39 is a foot accelerator pedal, which is linked to the governor 32 by a wire separate from the operation lever 8.

[Effect of device]

As described above, according to the present invention, in the tractor that controls the governor of the engine by the turning operation of the operation lever arranged in the driver's seat, the tractor is erected from above and to the left and above the connecting member, and the pedal shaft is provided above the connecting member. A bracket having a holding boss is provided, a mounting plate having a horizontal surface is fixed to the boss of the bracket, a recess is formed in a part of the horizontal, and the base of the operation lever is formed in the recess. The end part should be rotatable about a horizontal plane, the lever plate extending from the operation lever should be connected to the wire leading to the governor, and the end part of the lever plate should be in contact with the rising part of the recess of the mounting plate. The rotation range of the operating lever is restricted by this, a special stopper is not required, and a simple structure with a reduced number of parts can be achieved. Since the formation of the plate in the recess can be configured inexpensive engine control apparatus which can prevent the inconvenience such as deformation increases its rigidity.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a plan view of the main part, FIG. 2 is a front view of the main part, FIG. 3 is a side view of the main part, and FIG. A side view showing a tractor to which the invention is applied, in the figure, 1: tractor, 4: engine, 6: driver's seat, 8: operating lever, 9: connecting member 17: bracket, 19: boss, 20: mounting plate, 21 : Recess, 21a: Rise, 22: Lever plate, 29: Wire, 32: Governor

Claims (1)

(57) [Scope of utility model registration request] 1. In a tractor for controlling a governor of an engine by rotating an operating lever provided in a driver's seat, the tractor is erected from right and left above a connecting member connecting an engine and a rear mission case, and a pedal shaft is provided at an upper portion. A bracket having a boss portion for holding is disposed, a mounting plate having a horizontal surface portion is fixed to the boss portion of the bracket, a recess is formed in a part of the horizontal surface portion, and the operation lever of the operation lever is formed in the recess. The base end is provided to be rotatable around a horizontal plane, the lever plate extending from the operation lever is connected to the wire leading to the governor, and the end of the lever plate is brought into contact with the rising part of the recess of the mounting plate. By doing so, the engine control device for the tractor is a stopper that restricts the range of rotation of the operating lever.