JPH0237623Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to operate two systems of belt tension clutches, one for high speeds and one for low speeds, by operating a single lever. This relates to the clutch-brake interlocking mechanism in the device, and in particular, the mechanism that operates the brake lever that brakes the traveling gear in conjunction with the "off" operation of the two-system clutch lever can be implemented with a simple configuration. This is what I did.

Embodiments of this invention will be described below based on the drawings.

As shown in FIG. 1, the mobile agricultural machine of this invention has a loading platform 18 in front of the chassis 17, a motor chamber 29 containing the prime mover 19 behind the chassis 17, and a pair of right and left crawlers at the bottom of the chassis 17. This is an agricultural transport vehicle having a traveling device 13 of the following type.

The power output from the prime mover 19 is the V-belt 20
The driving device 13 is also driven by the power transmitted to the transmission box 22 via the transmission box 21, and the speed changed by the transmission box 22, thereby driving the transport vehicle.

Next, a traveling operation device for driving and braking the traveling device 13 will be explained. Pulleys 23 and 24 of different diameters for high speed and low speed are pivotally attached to the prime mover 19, and pulleys 25 and 26 are pivoted to the transmission box 22 in correspondence with the pulleys 23 and 24. The V-belts 20, 21 are loosely installed between the pulleys, and power is transmitted by applying tension to the belts by the tension pulleys 27, 28 of the tension pulley arms 4, 5. Tension pulley arms 4 and 5 that actuate the tension pulleys 27 and 28 are pivotably attached to the fuselage, and a clutch lever 2 provided at the top of the engine room 29 is connected to forks 8 and 9 that can be freely engaged and disengaged. and connectors 6, 7
It is connected with. In FIG. 2, the clutch lever 2 has a curled end and a pivot shaft 3.
It is pivoted to. On both sides of the clutch lever 2, forks 8 and 9, each having a fork-shaped opening with their tips facing inward, are fixed to base parts 10 and 11, and the base parts 10 and 11 are loosely fitted into the pivot shaft 3, so that the forks 8 and 9 are opened in the shape of a fork. 9 freely rotates in the front and rear directions. Further, a U-shaped guide groove 1 is cut in the cover 30 on the upper surface of the engine room 29, and the clutch lever 2 can move forward and backward and left and right along this groove 1. A guide groove 1 for guiding the brake lever 14 is provided on the side of this U-shaped guide groove 1.
2 is turned off, and this brake lever 14 is pivotally connected to a pivot 3 so as to be freely rotatable in the front and rear directions, and is linked to a braking device 32 by a wire 31. Further, a stopper member 15 is fixed to the brake lever 14 to prevent the forks 8 and 9 from rotating rearward. An auxiliary guide portion 16 of the clutch lever 2 is cut at a rear position of the U-shaped guide groove 1 and continues with this groove 1, and the clutch lever 2 engages with the forks 8 and 9 to guide the auxiliary guide portion 16. When pivoting, the forks 8, 9 engage the stop member 15. Here, the forks 8 and 9 are always urged to rotate rearward by the return springs 33 and 34 of the tension pulley arms 4 and 5, and the operation of the clutch lever 2 has to overcome this spring resistance. It is done. Further, the brake lever 14 is constantly urged by a spring 35 to rotate forward. Then, the rearward rotation of the forks 8 and 9 is controlled by the brake lever member 1.
Spring 3 of forks 8 and 9 is used to stop spring 5.
The brake lever 14 is biased by the spring 35 with a force greater than the rearward rotational force generated by the brake levers 3 and 34.

If the clutch lever 2, which is in the state shown in FIG. The tension pulley 28 tensions the V-belt 21 by rotating. If it is desired to apply braking to the moving agricultural machine by rotating the clutch lever 2 forward, the brake lever 14 is appropriately rotated rearward. Return the clutch lever 2 to its original position, and then
6, the forks 8 and 9 rotate the stopper member 15 rearward, and brake braking is performed.

In summary, this invention provides a single clutch lever 2 rotatably pivoted to a pivot shaft 3, which can be guided along a U-shaped guide groove 1 to switch the traveling device 13 between high and low speeds. bases 10 of forks 8, 9 connected to connections 6, 7 with tension pulley arms 4, 5 on both sides of the clutch lever 2;
11 are arranged opposite to each other and pivotally connected to the pivot shaft 3, and the clutch lever 2 can be freely engaged with and detached from the forks 8 and 9, respectively. In a travel operating device for a mobile agricultural machine, in which a brake lever 14 that is guided by a brake lever and brakes a travel device 13 is pivoted to the pivot, the fork 8 is normally elastically biased by springs 33 and 34 to rotate backward. , 9 is fixed to the brake lever 14, and an auxiliary guide portion 16 of the clutch lever 2 is provided at a rear position of the U-shaped guide groove 1 and continuous with the groove 1. When the clutch lever 2 rotates along the auxiliary guide portion 16, the forks 8 and 9 engage with the stopper member 15, causing the brake lever 14 to rotate so that the traveling device 13 can brake. did.

By configuring it in this way, the following effects can be obtained. That is, in a mobile agricultural machine that drives the traveling device 13 in two systems, high speed and low speed, by operating a single clutch lever 2, the brake lever 14 is used to apply braking to the traveling device 13 while it is moving. A stopper member 15 is fixed to the brake lever 14, and a fork 8, which rotates by engaging the stopper member 15 with the clutch lever 2.
The clutch lever 2 and the brake lever 14 can be interlocked with each other with a simple structure of engaging with the clutch lever 9. That is, while the two-system clutch operation is performed using the U-shaped guide groove 1, the series of clutch levers 2
It is also possible to brake the traveling device 13 by operation. Further, since the stopper member 15 also serves as a member for stopping the backward rotation of the forks 8 and 9, which normally rotate rearward due to the return springs 33 and 34 of the tension pulley arms 4 and 5, the fork There is no need to provide separate members for restricting the backward rotations of 8 and 9, respectively.

If the auxiliary guide section 16 is constructed so that the entire rear part of the U-shape has a width in the front and rear direction as shown in FIG. Since it is possible to switch between high speed and low speed by moving the clutch lever 2 left and right while applying braking, braking is possible even in the neutral state of the clutch that occurs while the clutch lever 2 is being switched from side to side. Even when the lever 2 is switched, the mobile agricultural machine does not run out of control and is safe.

[Brief explanation of the drawing]

The figures show one embodiment of this invention. Fig. 1 is a side view of the whole with a part cut away, Fig. 2 is a partially enlarged perspective view of the main part, and Fig. 3 is another embodiment of the main part. FIG. 3 is a partially enlarged plan view with a portion shown in cross section. 1... U-shaped guide groove, 2... Clutch lever,
3... Pivot, 8, 9... Fork, 14... Brake lever, 15... Stopper member, 16...
Auxiliary guidance section.

Claims (1)

[Scope of utility model registration request] The traveling device 1 is guided along the U-shaped guide groove 1.
A single clutch lever 2 capable of switching between high and low speeds is provided rotatably connected to a pivot shaft 3, and on both sides of this clutch lever 2 there are connectors 6, 7 for connecting tension pulley arms 4, 5. The bases 10, 11 of the forks 8, 9 connected to the U
A brake lever 1 that is guided along a guide groove 12 arranged in parallel with the letter-shaped guide groove 1 and brakes a traveling device 13.
4 is pivotally connected to the shaft 3, and springs 33 and 34 are normally used for backward rotation.
A stopper member 15 for restraining the backward rotation of the forks 8 and 9 which is elastically biased by the brake lever 14 is fixed to the brake lever 14, and the U-shaped guide groove 1
An auxiliary guide part 16 of the clutch lever 2 is provided at a rear position of the clutch lever 2 so as to be continuous with the groove 1, and when the clutch lever 2 rotates along the auxiliary guide part 16, the forks 8 and 9 are connected to the stopper member 15. A clutch-brake interlocking mechanism in a traveling operating device for a mobile agricultural machine, which engages and rotates the brake lever 14 so that the traveling device 13 applies the brakes.