JPS6124748Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a tension arm of a belt tension type transmission used as a simple transmission.

A belt tension type transmission using a tension pulley is convenient because it can be configured simply and without the need for a transmission case, etc. However, it is convenient when the clutch is disengaged in a relaxed state, that is, in a neutral gear state. The disadvantage was that the belt would sag in places where it should not be rotating. or,
Since the tension arm and the tension arm axis are located far from the outer V-belt, the tension pulley tilts and comes into contact with the V-belt, which causes the V-belt to
There were drawbacks such as the belt coming off easily.

The object of the present invention is to eliminate such problems with belt tension type transmissions.

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 an overall side view of a small management machine among agricultural machines, and FIG. 2 is an enlarged view of the handle device.

An engine 1 is mounted and fixed on an engine frame 8, and an engine pulley 1 of the engine 1 is mounted and fixed on an engine frame 8.
Three V-belts 21a, 21b20 are wound between the input pulley 14 of the transmission case 5 and the transmission case 5, and by tensioning either V-belt with the belt tension pulley, a belt tension type speed change is performed. It is configured to do so.

This belt tension type transmission is covered with a belt cover 2. The speed is further changed within the transmission case 5 via a sliding gear type transmission, and the transmission is transmitted to axles 6, 6 protruding from both sides of the lower part. Axle 6,6
Axles 12, 12 are installed. 7 is Hitsuchi.

A handle frame 4 is pivotally mounted on a handle base 3 provided on the upper part of a mission case 5 so as to be able to be moved back and forth, and a handle lock lever 28 is loosened to move the handle 11 back and forth. A speed change lever 10 for a belt tension type transmission is rotatably provided on a square handle 11 projected by a handle frame 4. The shift lever 10 pulls either of the inner wires in the clutch wires 26, 27 to tension the V-belt.

Reference numeral 9 denotes a main speed change lever for operating a gear sliding type transmission inside the transmission case 5.

FIG. 3 is a side view of the belt tension type transmission showing the inside of the belt cover 2. FIG. FIG. 4 is a partially sectional plan view, FIG. 5 is a front view of the high-speed belt tension arm device, and FIG. 6 is a side view.
FIG. 7 is a side view of the low-speed belt tension arm device, and FIG. 8 is a plan view thereof.

Both the engine pulley 13 and the input pulley 14 are provided with three grooves. If only one V-belt was used on the low-speed side, the pitch circle diameter on the engine pulley 13 side would be small, causing slippage and poor power transmission efficiency, so two V-belts 21a and 21b are wound. Two low-speed side V-belts 21
A wide tension pulley 15 is in contact with a and 21b. Further, a narrow tension pulley 16 is in contact with the high-speed side V-belt 20.

The tension pulley 15 on the low speed side is supported by a bearing on a pulley shaft 18a, and the tension arm 18 has a deflection bent portion in the center as shown in FIGS. 7 and 8. An inner wire connecting arm 35 of the wire 27 protrudes from the boss portion 34, and the inner wire of the wire 27 is connected to the inner wire connecting arm 35 via the buffer spring 22. Further, a downward biasing panel 36 is engaged with the base of the tension arm 18, and is biased downward except when it is pulled by the inner wire.

The tension arm of the tension pulley 16 on the high-speed side is composed of a holding arm 19 and a support arm 17, and the support arm 17 rotates in a narrow gap between the high-speed side V-belt 20 and the low-speed side V-belt 21b. It is configured as much as possible. The holding arm 19 projects perpendicularly from the support arm 17 and then bends downward, and has a pulley pivot shaft 19a projecting inward from its lower end. Support arm 17 and holding arm 19
Completely embrace the high-speed side V-belt 20 between the V
Prevents the belt from coming off. A connecting arm 32 of an inner wire is also provided on the boss portion 31 of the high-speed side tension pulley arm so as to be deviated inward, and the inner wire of the wire 26 is connected to the connecting arm 32 via a buffer spring 23. There is.

Outer wire receiver 2 for wires 26 and 27
9 and 30 are connection bolts 38 and 38 that fix the inside of the belt cover 2 and the connection piece of the transmission case.
It is fixedly installed on a wire receiving mounting piece 37 extending from the top.

Further, the boss portions 31 and 34 of both tension arms are pivotally supported on an arm shaft 39. Boss portions 31 and 34 are pivotally supported on the arm shaft 39 while being urged downward by urging springs 24 and 36.

By engaging the gear shift lever 10 with either the wire 26 or 27 in the U-shaped groove and pulling the inner wire, the tension pulley 16 or 15 comes into contact with the V-belt, tensioning it and shifting the gear. be.

As described above, the present invention is a belt tension type transmission that changes speed by selectively tensioning two or more V-belts wound between two pulleys, in which the tension arm is held by the support arm 17. The support arm 17 is configured to be able to rotate up and down between the parallel V-belts, and the holding arm 19 projects outward from the support arm 17 and is positioned beyond the V-belt 20 under tension. The tension pulley 16 is arranged to protrude inward at a position where the holding arm 19 exceeds the lower end of the V-belt, and the inner and outer surfaces of the V-belt 20 are engaged by the support arm 17 and the holding arm 19. The horizontal part of the arm 19 that holds the upper and lower parts and the tension pulley 16
The tension pulley 16 is abutted from below in a shape that embraces the V-belt 20, and provides the following effects.

First, since the support arm 17 is arranged between the V-belt 21b on the low-speed side and the V-belt 20 on the high-speed side, it is possible to prevent both V-belts from wobbling laterally. This prevents the belt from climbing over the belt groove and coming off.

Second, the V-belt 20 on the high-speed side is engaged with the inner and outer surfaces by the support arm 17 and the holding arm 19, and the upper and lower sides are engaged with the horizontal part of the holding arm 19 and the tension pulley 16. By adopting a shape that embraces the body, it was possible to completely prevent it from rolling or coming off.

Thirdly, although the V-belt 20 is surrounded and guided on all sides, it is not surrounded by a closed frame on all sides, and the tension pulley 16 and support arm 17 are separated. During assembly, the V-belt 20 can be passed through the gap, so assembly will not be difficult.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the management machine among agricultural machines.
Fig. 2 is an enlarged view of the handle device, Fig. 3 is a side view of the belt tension type transmission showing the inside of the belt cover 2, Fig. 4 is also a partially sectional plan view, and Fig. 5
6 is a side view of the belt tension arm device on the high speed side, FIG. 7 is a side view of the belt tension arm device on the low speed side, and FIG. 8 is a plan view of the belt tension arm device on the low speed side. 13...Engine pulley, 14...Input pulley, 15...Low speed side tension pulley, 16
...High-speed side tension pulley, 17...Support arm among high-speed side tension pulley arms, 1
8...Low speed side tension pulley arm, 19...
...Support arm of the high-speed side tension pulley arm.

Claims (1)

[Scope of utility model registration request] In a belt tension type transmission that changes speed by selectively tensioning two or more V-belts wound between two pulleys, the tension arm is composed of a support arm 17 and a holding arm 19, The support arm 17 is configured to be able to rotate up and down between the parallel V-belts, and the holding arm 19 protrudes outward from the support arm 17, bends downward at a position beyond the V-belt 20 under tension, and further At a position where the holding arm 19 exceeds the lower end of the V-belt, the tension pulley 16 is arranged to protrude inwardly, and the
The inner and outer surfaces of the belt 20 are locked by the support arm 17 and the holding arm 19, and the upper and lower sides are locked by the horizontal part of the holding arm 19 and the tension pulley 16, and the V-belt 20 is held in place by a tension pulley from below. A belt tension type transmission characterized by having a tension pulley 16 in contact with it.