JPS628356Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an accelerator device for a construction vehicle such as a shovel loader.

Accelerator devices for construction vehicles have a single engine installed in the engine hood that both drives the vehicle and operates the work equipment. In addition to being installed in the driver's seat, an accelerator lever that operates the speed governor when the work equipment is activated is installed separately at the required location, so that when the vehicle is running, the speed governor can be operated independently of the accelerator lever by depressing the accelerator pedal. When the machine is activated, the accelerator lever is pivoted to operate the speed governor independently of the accelerator pedal. Because a complicated link mechanism is used to connect the machine and the speed governor to the accelerator lever for operating the work machine, the machine efficiency is poor and the number of parts is large, making manufacturing, inspection, and repair time-consuming. Furthermore, there were drawbacks such as the accelerator lever moving when the engine moved relative to each other during sudden starts or stops.

The present invention was completed with the aim of providing an accelerator device for a construction vehicle that does not have the above-mentioned drawbacks, and will be described in detail below using the illustrated shovel loader as an embodiment.

Reference numeral 1 denotes an engine hood housing an engine 2, a speed governor 3, etc., and a pulley mounting bracket 4 having a U-shaped cross section and having a top fixed to a top plate 1' is provided inside the engine hood 1. A guide portion 5 such as a horizontally long window hole is provided on both leg plate portions of the bracket 4. Reference numeral 6 denotes a pulley which is attached to the guide part 5 so that the central shaft is always supported at the rear end position of the guide part 5 so that it can slide and rotate along the guide part 5. 6 is connected to an accelerator pedal via an accelerator wire 7 so as to be moved forward under the guidance of the guide portion 5 when an accelerator pedal (not shown) for driving the vehicle is depressed, which is provided at the driver's seat. Reference numeral 8 denotes a bracket for attaching an accelerator lever, the top of which is fixed to the inner surface of the top plate of the engine hood 1, in addition to the bracket 4 for attaching the pulley. The lower end of an accelerator lever 10 for operating a working machine whose lower part is inserted into the engine hood 1 is pivotally attached to a shaft 11, and the lower end of the accelerator lever 10 is attached to the governor 3 lever part 12
One end of a wire 13 is connected to the other end of the wire 13, and the middle of the wire 13 is suspended from the pulley 6. Furthermore, stoppers 14 and 15 are attached to the inner surface of the top plate of the engine hood 1, sandwiching the accelerator lever 10 in the front and rear. Even if the wire 13 is pulled forward by the operator, the forward pivoting of the accelerator lever 10 for actuating the working machine is restricted, and the accelerator lever 10 is prevented from being actuated by operating the accelerator pedal. On the other hand, the rear stopper 15 restricts the accelerator lever 10 from pivoting rearward more than necessary. Note that 16 in the figure is a working machine such as a backhoe connected to the rear of the vehicle body.

With this structure, when the vehicle is running, when the accelerator pedal is pressed, the pulley 6 connected to the accelerator pedal with the accelerator wire 7 is connected to the bracket fixed inside the engine hood 1. The pulley 6 moves forward as shown by the dashed line in the figure under the guidance of a guide part 5 provided at the speed governor 3.One end of the pulley 6 is connected to the lever part 12 of the speed governor 3, and the other end is connected to the lever part 12 of the speed governor 3. Since the middle of the wire 13 connected to the lower end of the accelerator lever 10 for actuating the work machine whose forward pivoting is restricted by the stopper 14 is suspended, the pulley 6 moves as the accelerator pedal is depressed. Although the accelerator lever 10 moves forward, since the forward pivoting of the accelerator lever 10 is restricted by the stopper 14 as described above, the accelerator lever 10 moves forward.
The lever part 12 of the speed governor 3 is pivoted regardless of the situation. Therefore, when the vehicle is running, when the accelerator pedal is depressed, the speed is controlled by the speed governor 3, and when the accelerator pedal is released, the restoring force of the lever part 12 controls the speed. The lever portion 12 returns to the old position and stops regulating the speed, and the governor 3 can perform the required speed regulating when the vehicle is running, similar to the accelerator device of conventional construction vehicles of this type. . Therefore, when operating the work machine, the accelerator lever 10 for operating the work machine
When the pulley 6 is pivoted rearward as shown by the two-dot chain line in the figure, the pulley 6, whose central axis is normally located at the rear end of the guide portion 5, cannot be moved rearward, so the pulley 6 is rotated. The wire 13 suspended in the middle is pulled, and the lever portion 12 of the speed governor 3 connected to one end of this wire 13 changes the front and back position of the pulley 6 on which the wire 13 is suspended, as described above. Therefore, when operating the work equipment, when the accelerator lever 10 is pivoted backwards, the speed is controlled by the speed governor 3, and the accelerator lever 10 is returned to its old state. When the lever portion 12 of the speed governor 3 is returned to its original position by its own restoring force, speed control is stopped, and the speed governor 3 is used to control the work machine, similar to the accelerator device of conventional construction vehicles of this type. It is possible to perform the required speed regulation during operation. Moreover, as described above, the connection between the accelerator pedal for running the vehicle and the speed governor 3 and the connection between the speed governor 3 and the accelerator lever 10 for operating the work machine are achieved by the guidance of the guide portion 5 provided on the bracket 4. This is achieved by a pulley 6 that moves downward and forward, and a wire 13 whose middle part is suspended from the pulley 6 and whose both ends are connected to the lever part 12 of the speed governor 3 and the accelerator lever 10. Since no complicated link mechanism is used, the machine is highly efficient, has a small number of parts, and is extremely easy to manufacture, inspect, and repair. Furthermore, in the conventional speed governor and accelerator lever connected by a link, the engine 2, which is flexibly supported against the vehicle body, is moved against the vehicle body when starting suddenly backwards or suddenly stopping while moving forward. When moving relatively forward, the accelerator lever 10 is also moved violently, which is dangerous and causes wear and noise, but in the present invention, the lever part 12 of the speed governor 3 and the accelerator lever 10 Since the accelerator lever 10 is connected by the wire 13, the accelerator lever 10 does not move even if the engine 2 moves due to inertia as described above. That is, when the engine 2 moves forward due to a sudden start backwards or a sudden stop while moving forward, the wire 13 is loosened, so no load is applied to the accelerator lever 10, and the accelerator lever 10 is not moved. Furthermore, even when the engine 2 moves rearward with respect to the vehicle body, a sufficient buffering effect can be obtained due to the elongation of the wire 13.

Therefore, the present invention has great practical value as it eliminates the drawbacks of conventional accelerator devices for construction vehicles.

[Brief explanation of the drawing]

The drawing is a partially cutaway side view showing an embodiment of the present invention. 1: Engine hood, 2: Engine, 3: Speed governor, 4: Bracket for mounting pulley, 5: Guide section, 6: Pulley, 10: Accelerator lever for operating the work machine, 12: Lever section of speed governor , 13: wire, 14: stopper.

Claims (1)

[Scope of utility model registration request] In a construction vehicle that uses an engine installed in the engine hood to drive the vehicle and operate work equipment, a bracket 4 for attaching a pulley is fixed in the engine hood 1, and the bracket 4 is attached to the vehicle. A pulley 6 is attached which moves forward under the guidance of a guide part 5 provided on the bracket 4 when the accelerator pedal is depressed, and one end of the pulley 6 is connected to the lever part 12 of the speed governor 3. A construction characterized in that the middle of the wire 13 is suspended, and the other end of the wire 13 is connected to the lower end of an accelerator lever 10 for operating a working machine whose forward pivoting is restricted by a stopper 14. Vehicle accelerator.