JPH0128368Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a simple transmission device used in various industrial machines. Especially the high and low 2
The present invention relates to an inexpensive speed change device that only needs to change gears and is not concerned with transmission efficiency.

(b) Prior Art Conventionally, split pulley type transmissions have been widely used as simple transmissions.

However, even though the split pulley type transmission had the advantage of being able to continuously variable speed, it had the drawbacks of being too large and expensive.

In addition, gear sliding type transmissions that change speed between two fixed gears and a sliding gear on an opposing spline shaft are also often used, but they require construction within the transmission case. In this respect, the price was high and there were problems such as the inability to make a compact structure.

(c) Problems to be solved by the invention The purpose of the invention is to solve these conventional problems, and to develop a simple transmission device using two shafts and four friction discs. It is composed of

(d) Means for solving the problem The purpose of the present invention is as described above. Next, the configuration for achieving the purpose will be explained.

Two friction disks are placed facing each other on two parallel axes, and the driven shaft is rotated toward the drive shaft around a pivot point provided between the two friction disks. Possibly, the friction disc on the driven shaft contacts the friction disc on the drive shaft to transmit rotation.

(e) Embodiments and operations The purpose and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings and the operation of the invention will be explained.

Fig. 1 is a front view of the transmission of the present invention, Fig. 2 is a bottom sectional view, Fig. 3 is a front sectional view showing the main parts of the invention, and Fig. 4 is a front view of the transmission in a shifted state from Fig. 3. A sectional view, FIG. 5 is an overall side view of the present transmission device used in a snow blower, and FIG. 6 is a plan view.

First of all, this embodiment is a snow blower A equipped with a transmission device, and to explain its overall configuration as shown in FIGS. A duct 21 is attached to discharge the water. Engine 1 is installed on the top of this machine 17.
The power from the engine 18 is taken out from the crankshaft 22 and transmitted to pulleys 23 and 24 fixed to the crankshaft 22. The signal is transmitted from the pulley 23 via the belt 25 to the pulley 26 on the work machine drive shaft 27 provided in the front-rear direction, and then the work machine drive shaft 2
The auger 20 is rotated by the worm gears 29 and 30 provided at the tip of the work equipment 7 to shovel snow, and the blower 28 fixed on the working machine drive shaft 27 removes the snow from the duct 21. It bounces away.

The power from the pulley 23 is transmitted via the belt 30 and pulley 31 to a friction disc type transmission device, which will be described later, to change the speed, and is transmitted from the output shaft 9 of the device to the main transmission device via the pulley 2 and belt 13. It is. An input pulley 33 and a drive disk 34 are fixedly installed on the input shaft 32 of the traveling main transmission, and a speed change disk 35 is provided vertically in contact with the side surface of the drive disk 34.
5 is spline-fitted to the sliding shaft 36. Therefore, power is frictionally transmitted from the drive disk 34 to the speed change disk 35, and when the speed change disk 35 is slid in the circumferential direction of the drive disk 34, the number of rotations is increased. Power is transmitted from the sliding shaft 36 to a traveling shaft 41 via gears 37, 38, 39, and 40, and drives a sprocket 43 of a crawler type traveling device 42.

Next, the friction disc type transmission will be described in detail with reference to FIGS. 1 to 4. Power is transmitted to the input pulley 1 by the input belt 12. The input shaft 8 is a drive shaft, and is supported by a bearing case 10 so as not to be able to move up and down. The bearing case 10 is fixed to the transmission support stand 14. A friction disk 3 and a friction disk 4 are fixed on the input shaft 8. Friction discs 5 and 6 are also fixed to the output shaft 9, and all four are constructed by baking rubber or the like onto cast discs. The output shaft 9 is supported by a bearing case 11, and further includes:
The bearing case 11 is pivotally supported at a pivot point 7 so as to be vertically movable. A handle arm 16 is fixed to a pivot shaft forming the pivot point 7, and a spring 15 beyond the fulcrum is interposed at the tip of the handle arm 16. The fulcrum spring 15 brings the friction disks 5 and 6 on the output shaft 9 into contact with the friction disk 3 or 4 on the input shaft 8 on the transmission side. be.

Since the friction disk 3 is larger than the friction disk 4 and the friction disk 5 is smaller than the friction disk 6, the biased contact between the friction disks 3 and 5 causes A high gear speed can be obtained, and a low gear speed can be obtained due to the biased contact between the friction discs 4 and 6, as shown in FIG. 2 is an output pulley, and 13 is an output belt.

The present invention is constructed as described above, and when the operator operates the handle arm 16 and rotates it from side to side, the fulcrum cross-over spring 15 operates and urges the handle arm 16 to the rotation position. Then, the friction disk 5 or the friction disk 6 is connected to the input shaft 8.
The upper friction disk 3 or 4 is pressed and urged to transmit rotation by frictional force. Therefore, when avoiding obstacles during snow removal work, it is possible to quickly avoid obstacles by simply operating the handle arm 16 without operating the clutch. When an excessive load is applied to the working machine, the friction disk 5 or 6 moves backward against the fulcrum over-the-point spring 15, allowing it to slip and relieve the overload. be.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, like the conventional gear sliding type transmission,
Since there is no need for a transmission case or a sealed oil pan, it can be constructed at a low cost, and there is no need to worry about oil leakage.

Secondly, according to the transmission device of the present invention, there is also the effect that the gear change operation can be performed without difficulty even during rotation.

[Brief explanation of the drawing]

Fig. 1 is a front view of the transmission of the present invention, Fig. 2 is a bottom sectional view, Fig. 3 is a front sectional view showing the main parts of the invention, and Fig. 4 is a front view of the transmission in a shifted state from Fig. 3. A sectional view, FIG. 5 is an overall side view of the present transmission device used in a snow blower, and FIG. 6 is a plan view. 3, 4, 5, 6...Friction disk, 7...Pivot point,
8...Input shaft, 9...Output shaft, 15...Spring beyond the fulcrum, 16...Handle arm.

Claims (1)

[Scope of utility model registration request] Two friction disks are placed facing each other on two parallel axes, and the driven shaft is rotated toward the drive shaft around a pivot point provided between the two friction disks. A friction disc type transmission device, characterized in that a friction disc on a shaft on a driven side is configured to contact a friction disc on a shaft on a driving side to transmit rotation.