JPS645666Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an automatic running noise reduction device that reduces the noise generated when a tracked vehicle runs.

[Conventional technology]

Conventionally, in tracked vehicles equipped with earthmoving equipment such as bulldozers, earthwork operations such as soil transport are carried out by keeping the engine at maximum rotational speed and shifting the transmission into gear in order to obtain the maximum traction force during work. When returning to the original position after transporting soil, in order to increase work efficiency, the transmission is often put into the highest speed gear and driven at high speed while the engine is maintained at the highest speed. Collision causes maximum running noise.

For this reason, conventional noise reduction devices have been proposed in which a cushion rubber is provided around the sprocket to alleviate and absorb running noise generated when the crawler track collides with the sprocket during high-speed running.

However, in the above-mentioned noise reduction device, if the cushion rubber rubs, it is necessary to insert a shim between the bracket and sprocket to which the cushion rubber is attached, and adjust the cushion rubber so that it is always in contact with the track, which requires a lot of maintenance. There was a problem that required a lot of trouble.

Purpose of the invention This invention was made with the aim of improving the above-mentioned problems, and by providing an automatic running noise reduction device that can reduce running noise without the need for cushion rubber, it aims to simplify maintenance, etc. It is something that we try to do.

Structure of the device: A limit switch that is turned on when the highest speed is selected is installed near the transmission where the speed gear is selected by the gear shift lever, and an electromagnetic switch that is electrically connected to the limit switch is placed on the decel pedal that decelerates the engine. An automatic running noise reduction device equipped with a solenoid that automatically reduces engine rotation when the gear shift lever is set to the highest speed gear.

Embodiment An embodiment of this invention will be described in detail with reference to the drawings. In the figure, 1 is the body of a tracked vehicle, 2 is a driver's cab provided on the body 1, and a gear shift lever 3 is provided on the side.
However, a fuel control lever 5 (not shown) for controlling the rotation of the engine (not shown) is provided on the front dart board 4, and a decel pedal 11 is provided on the floor. The gear shift lever 3 has a U-shaped guide groove 6.
, three forward speeds and three reverse speeds can be selected and operated, and the operation of the shift lever 3 is controlled by a transmission (not shown) via a link mechanism 7 connected to the lower end of the shift lever 3. The signals are transmitted to the forward/reverse switching lever 8 and the speed switching lever 9, respectively, so that the forward/reverse movement of the transmission and the speed range are selected.

Also, in the vicinity of the speed gear change lever 9, there is a limit switch 1 that is turned on when the speed gear is set to third gear.
0 is installed, and this limit switch 10
is electrically connected to an electromagnetic solenoid 22 connected to the lever 11a of the dexel pedal 11.

On the other hand, the fuel control lever 5 is connected to one end of a loose spring cylinder 14 via a connecting rod 12 and a bell crank 13. The other end of the loose spring 14 is pivotally connected to a lever 16 attached to a rotating shaft 15, and the fuel control lever 5 rotates the rotating shaft 15.
is rotated, and two levers 17 and 18 are separately attached to the rotation shaft 15, and one lever 17 is connected to a fuel lever 20 of a fuel injection pump (both not shown) that supplies fuel to the engine. The two levers 18 are connected via a connecting rod 19, and the other lever 18 is connected to the lever 11a of the decel pedal 11 via a connecting rod 21.

Effects of the invention This invention has been described in detail above, so even if it has the gear shift lever 3, when the highest speed gear (for example, 3rd gear) where the running noise is louder is entered, the gear change lever 9
The limit switch 10 provided near the decel pedal 11 is turned on and the electromagnetic solenoid 22 is energized.
Tow 1a in the direction of deceleration. As a result, the fuel lever 20 of the fuel injection pump is also rotated from the full position in the direction of squeezing the fuel, so the rotation of the engine is automatically decelerated and the noise generated from the suspension and engine noise during driving is automatically reduced. It will be possible to reduce the

In addition, by using the automatic reduction device mentioned above, conventional cushion rubber etc. are not required, so there is no need for troublesome work such as adjusting the mounting position according to the wear of the cushion rubber, making maintenance easier. It's also effective.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, with FIG. 1 being a side view and FIG. 2 being a plan view of the vicinity of the gear shift lever. 2 is a driver's seat, 3 is a gear shift lever, 5 is a fuel control lever, 10 is a limit switch, 11 is a dexel pedal, and 22 is an electromagnetic solenoid.

Claims (1)

[Scope of utility model registration request] A gear shift lever 3 and a fuel control lever 5 are located near the driver's seat 2.
and a dexel pedal 11, in which the speed change lever 3 selects the forward/reverse movement of the transmission and the speed stage, and the fuel control lever 5 and the dexel pedal 11 control the engine speed; A limit switch 10 that is turned on when the highest speed is reached is placed near the decel pedal 11, and an electromagnetic solenoid 22 that is electrically connected to the limit switch 10 is placed near the decel pedal 11.
The automatic running noise reduction device is configured such that when the limit switch 10 is turned on, the electromagnetic solenoid 22 is energized, and the electromagnetic solenoid 22 operates the decel pedal 11 in the deceleration direction.