JPS6232940Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a round handle type steering device for a crawler type self-propelled vehicle.

Among crawler-type self-propelled vehicles, when steering bulldozers, agricultural machinery, etc., which are slow in speed, release the steering clutch of the drive sprocket of the left and right crawlers in the direction in which you want to turn, and when you want to turn even more quickly. By applying a steering brake to the now free axis, the vehicle can make a steering turn.

However, when the purpose is to transport goods, such as a crawler type transport vehicle, even a crawler type self-propelled vehicle has a high speed, and a differential gear device is used to make left and right turns. Then, apply a swing brake to the axis you want to turn to provide resistance.
Turning is performed by operating a differential gear device. In crawler-type self-propelled vehicles that have such a differential gear device and a swing brake device, when operating the left and right steering levers, such as bulltozers and combines, it is not possible to operate either the left or right steering lever when turning. This can damage the differential gear or cause a rollover accident due to malfunction, so round handles are used to ensure that left and right brake operations are linked.

In a turning device for a crawler-type self-propelled vehicle that operates a turning brake using such a round handle,
Conventionally, an arm 11 as shown in Fig. 4 was provided to operate the left and right swing brakes, but in this case, wires 21 and 12 for operating the swing brakes were installed.
Because the inner wires 21a and 12a of the round handle 12 were entangled with the handle shaft 12a of the round handle 12, the round handle 12 could not be rotated more than half a turn.

Furthermore, since the steering wheel feels different from the feeling of a round steering wheel when steering a car, it could easily lead to an accident.

If a steering gear box used for automobiles and tractors is used as shown in Figure 3, the rotation of the round steering wheel can be made almost the same as that of automobiles, etc., but the price is higher, and in the case of a steering gear box, there is only one pitman arm. Since only the left and right swivel brakes are exposed, the fourth
It is necessary to further provide an arm 11 as shown in the figure.

In consideration of these points, the present invention provides a helical cam, rotates the helical cam by rotating the handle shaft of the round handle, and operates the swing brake device by rotating the helical cam.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is a plan view of a small carrier among crawler-type self-propelled vehicles, and FIG. 2 is a side view of the same.

A seat 10 is provided in a driver's cab 1, and a round handle 2 is provided in front of the seat 10. An engine 4 is provided below a seat 10, a clutch housing 5 is provided at the rear of the engine 4, and power is transmitted to a transmission case 7 by a power transmission shaft 6 via a universal joint. A drive sprocket 8 is driven by an axle 33 protruding from the transmission case 7, and a crawler 9 is rotated. 3 is a loading platform.

3 and 4 are drawings showing a conventional steering handle device, FIG. 5 is a perspective view of the spiral device of the present invention, FIG. 6 is a perspective view of a configuration for operating a wire-type swing brake operating mechanism, and FIG. 7 is a drawing of the same hydraulic swing brake operation mechanism, and FIG. 8 is a rear sectional view of the swing brake device section from the mission case 7.

A helical cam 18 for the right-hand swing brake and a helical cam 16 for the left-hand swing brake are provided on the handle shaft 2a of the round handle 2, and a circular spiral 17 is interposed between them. 17, the spirals 16 are connected to form one connected spiral.

In the case of the wire type shown in FIG. 6, levers 20 and 19 are placed at the rear edge of the central spiral 17 of the spiral.
The contact portions 20b and 19b are in contact with each other.

When the contact portions 19b and 20b of the levers 19 and 20 are pushed by the spiral cam, the inner wires 12a and 21a of the wires 12 and 21 are pulled using the pivot points 19a and 20a as fulcrums.

In the case of the hydraulic type shown in FIG. 7, contact portions 26 and 27 at the tips of the pistons of the left and right brake hydraulic cylinders 22 and 23 are in contact with the rear edge of the spiral 17.
When the round handle 2 is rotated, the contact portion 26 moves toward the larger diameter of the right-hand swing brake helical cam 16 to apply the brake. Conversely, the contact portion 27 moves toward the smaller diameter of the spiral 17.

Furthermore, when the round handle 2 is rotated in the opposite direction, the contact portion 2
6 moves toward the smaller diameter, and the abutting portion 27 moves toward the larger diameter, starting swing braking.

Since the left and right swing brake devices are operated in conjunction with the rotation of the steering handle in this manner, there is no risk of malfunctions that occur when operating the left and right brake levers.

FIG. 8 is a drawing showing the structure of the swing brake device.

Differential shafts 30, 30 protrude from the differential gear devices 29, 29 in the transmission case 7, and axles 33, 33 are connected to the differential shafts 30, 30 by couplings 32 and shear pins 31.

The axle 33 is protected by the drive shaft case 34, and a hole 34a is provided in the drive shaft case 34 so that it can be easily replaced when the shear pin 31 is sheared due to overload or the like. The hole 34a is normally covered with a cover body 35.

In the swing brake device, the brake drum 40 is integrally constructed with the boss 38 of the drive sprocket 8, and the brake arm 36 is connected to the wire 12a, 2.
When the brake cam 37 is pulled at 1a, the brake cam 37 opens and the brake shoe is expanded to bring it into frictional contact with the brake tram, thereby applying braking to the axle 33. By applying braking to the axle 33, the rotation of the drive shaft on the opposite side becomes faster via the differential device, and a turn is performed.

As described above, the present invention provides a crawler-type self-propelled vehicle with a round steering wheel, in which the differential gear device 29 is interposed between the left and right axles 33, and swing brake devices are further arranged on the left and right axles 33, 33. 2 enables turning operation, and a helical cam 18 for the right turning brake is attached to the handle shaft 2a of the round handle 2.
A spiral cam 16 for the left swing brake is provided, a circular spiral 17 is interposed between them, and these three spiral cams 18, circular spiral 17, and spiral cam 16 are connected to form a single connected spiral cam. It is configured in a spiral, and the rear edge of the circular spiral 17 at the center of the spiral is abutted with an abutment part that is linked to the braking force control part of the left and right swing brakes, so that the following effects are achieved. It is something.

First, by providing the circular spiral 17 between the helical cam 18 and the helical cam 16, the round handle 2 can be held in a state in which the contact parts linked to the braking force control parts of the left and right swing brakes are in contact with each other. The position of the contact portion does not change even when rotated, and the play of the round handle 2 can be made large.

In the conventional technology described in Japanese Patent Application Laid-Open No. 52-137828, the hydraulic pump is operated by a round handle, and the swing brake does not operate even when the round handle is rotated. Since this part is not configured, there is a risk that if the wheel of the vehicle runs on a stone or the like, the round handle will rotate and the swing brake will immediately activate, causing the vehicle to roll over.

Similarly, in the case of mechanically constructed swing brake devices described in other conventional techniques such as Utility Model Publication No. 38-2206 and Utility Model Application Publication No. 55-119263, The cam part does not have play, and there is no part that allows for erroneous operation during operation as in the case described above, so a dangerous situation occurs.

In the case of the present invention, the spiral cam 18 and the spiral cam 1
Between 6 and 6, there is a loose play formed by a circular spiral 17 that turns approximately half a turn, so even though it is a crawler-type traveling device, it can be operated with the same feeling as the round handle of a conventional wheel-type traveling device. It is something that can be done.

Second, since the spiral cam 18, the circular spiral 17, the spiral cam 16, and the abutting portion that abuts these are configured, when the spiral cam 18, the circular spiral 17, and the spiral cam 16 are connected, the circular The handle 2 can rotate three times, and the rotation angle for running operation of the round handle 2 can be increased, and unlike the conventional technology, it is not necessary to enlarge the fan shape to secure the rotation angle of the round handle. There isn't. That is, by arranging small spiral cams in an overlapping manner, the spiral cams do not take up much space.

[Brief explanation of the drawing]

Figure 1 is a plan view of a small carrier among crawler-type self-propelled vehicles, Figure 2 is a side view, Figures 3 and 4
Figure 5 is a diagram showing a conventional steering handle device, Figure 5 is a perspective view of the spiral device of the present invention, Figure 6 is a perspective view of a configuration for operating a wire-type swing brake operating mechanism, and Figure 7 is also a hydraulic type. FIG. 8 is a rear sectional view of the swing brake device section taken from the mission case 7. 2...Round handle, 2a...Handle shaft, 1
6, 18...Spiral cam, 17...Circular spiral, 1
9, 20... Lever, 22, 23... Brake hydraulic cylinder, 19b, 20b, 26, 27...
Contact portion, 33, 33... axle.

Claims (1)

[Scope of utility model registration request] A differential gear device 29 is interposed between the left and right axles 33, 33, and further the left and right axles 33, 3
A crawler-type self-propelled vehicle with a swing brake device placed on 3 can be rotated using a round handle 2,
A helical cam 18 for the right-hand swing brake and a helical cam 16 for the left-hand swing brake are provided on the handle shaft 2a of the round handle 2, with a circular spiral 17 interposed between the three helical cams 18 and 16. circular spiral 1
7. The spiral cams 16 are connected to form one connected spiral, and the central circular spiral 17 of the spiral
A running device for a crawler-type self-propelled vehicle, characterized in that a contact portion linked to a braking force control unit of left and right swing brakes is brought into contact with a trailing edge.