JPS6347317Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a split pulley in a belt type continuously variable transmission. Conventionally, a split pulley consisting of a fixed pulley and a moving pulley is installed on the shaft.
A so-called belt-type continuously variable transmission device that performs continuously variable speed by changing the diameter of the split pulley is widely used. Conventionally, as shown in FIG. 7, the split pulley of such a continuously variable transmission device has a joint structure for both the fixed pulley and the movable pulley using a key or the like in order to avoid a one-sided free-rotating structure. Since it is filled with grease etc. to lubricate the parts, it is necessary to install an O-ring to prevent leakage, and in order to prevent interference between this O-ring and the key, the pulley boss part has to be set long. Moreover, in order to ensure the thickness of the key part, the radial direction of the pulley boss part RO' is also increased, which inevitably results in an increase in the overall volume.

On the other hand, those that do not have a key and adopt the one-sided free rotation structure have the disadvantage of losing the transmission torque transmitted to the main shaft.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to provide a split pulley consisting of a fixed pulley and a movable pulley on a shaft,
In a belt-type continuously variable transmission device that performs continuously variable speed by changing the pulley diameter of the split pulley, a joint is installed in a space formed between the boss portion of the fixed pulley and the boss portion of the movable pulley and the shafts. The split pulley can be configured in a minimum space by fitting the pulley so that it can rotate freely relative to the pulley and slidably in the axial direction, and the fixed pulley and movable pulley rotate integrally through the joint. Belt-type continuously variable transmission reduces overall volume and costs, reliably prevents reduction in transmission torque due to one-side idler structure without increasing space, and further improves assembly efficiency. The purpose is to provide a split pulley for the device.

To explain the configuration of the present invention with reference to an embodiment shown in the drawings, reference numeral 1 is an engine mounted on Taylor A, and the power of the engine 1 is generated by a drive-side split pulley 3 provided on a PTO shaft 2 and a main shaft of a transmission 4. It is transmitted to the mission 4 via a driven side split pulley 6 provided at the driven side split pulley 6 and a transmission belt 7 stretched between these split pulleys 3 and 6, and further via a group of gears (not shown) in the mission 4. The signal is transmitted to the axle 8.

2 and 3 are cross-sectional views showing the driven side split pulley 6 when the diameter is large and when the diameter is small, where 9 is a fixed pulley and 10 is a movable pulley. Reference numeral 11 indicates a boss portion 9' of the fixed pulley 9 and a boss portion 1 of the movable pulley 10.
The joint 11 is a joint provided in a space a formed between the main shaft 5 and the main shaft 5, and the joint 11 is fitted to the main shaft 5 so that it can rotate relative to the main shaft 5 and can freely slide in the axial direction. As shown in FIG. 4, this joint 11 is provided with an engaging groove 11' on its outer periphery in which the boss portions 9' and 10' of both the fixed and movable pulleys 9 and 10 engage, respectively. is integrally provided with a flange 11'' that fits between the step 10'a provided on the boss 10' and the bearing 12. A clutch 13 is disposed between the movable pulley 10 and the transmission case 4'. Moving cam 14 and fixed cam 15 for use, moving cam 16 and fixed cam 1 for continuously variable transmission
7 are arranged adjacent to each other in the axial direction of the main shaft 5, and a clutch pushing bearing 19 is arranged directly above the bearing 18 of the continuously variable transmission moving cam 16. With this arrangement, the space between the split pulley 6 and the transmission case 4' can be effectively utilized, and the length of the main shaft 5 protruding outward from the transmission case 4' can be shortened as much as possible. There is. Furthermore, during assembly, the fixed pulley 9, movable pulley 10, joint 11, and other parts are filled with lubricating grease so that they can be assembled.

By the way, a flange 16' is provided on the outer periphery of the movable cam for continuously variable transmission, and this flange 16' is used to move the fixed cam 15 for the clutch.
It's like pressing .

In the figure, 13' is a clutch boss part, 20 is a guide bar for regulating the rotation of the clutch fixed cam 15, and 21
is an O-ring.

In the above embodiment, a structure in which continuously variable speed is performed by the driven side split pulley 6 has been described, but the present invention also relates to a structure in which continuously variable speed is performed by the drive side split pulley 3. Can be adopted.

Next, the operation of the present invention will be explained. The transmission force now received from the belt 7 is transmitted to the fixed pulley 9, the joint 11, the movable pulley 10, the clutch 13, and the main shaft 5 in this order when viewed from the fixed pulley 9 side. If the joint 11 were not present, the fixed pulley 9 side would be rotating freely, so the transmitted torque would only be transmitted to the movable pulley 10 side that meshes with the clutch 13, and therefore the transmitted torque transmitted to the main shaft 5 would be halved.
However, in the present invention, each boss portion 9', 10' of the fixed pulley 9 and movable pulley 10 is connected to the joint 11.
Since both pulleys 9 and 10 are spline-engaged with the engagement grooves 11' of the pulleys 9 and 10 and rotate integrally, the loss of transmission torque as described above is reliably eliminated.

Next, the lever is operated to move the variable speed cam 16
When the clutch 13 is rotated, the bearing 18, the boss portion 13' of the clutch 13, the bearing 12, and the movable pulley 10
3. To change the diameter of the split pulley 6 to a larger diameter, the movable cam 16 is operated in the reverse direction. At this time, the joint 11 slides on the main shaft 5 together with the movable pulley 10. The fixed cam 15 for clutch is uniformly pushed by the flange 16' of the movable cam 16 for infinitely variable speed and displaced integrally in the axial direction (displacement in the rotational direction is restricted by the guide bar 20). Therefore, no matter what state the movable cam 16 for infinitely variable speed is in, i.e., no matter what speed change state the infinitely variable speed is in, the relationship between the fixed cam 15 for clutch and the movable cam 14 does not change, and the clutch 13 remains in the same state.
The intermittent state is maintained unchanged, and the clutch can be freely turned on and off in that position.

As described above, the present invention provides a belt-type continuously variable transmission in which a split pulley consisting of a fixed pulley and a movable pulley is provided on the shaft, and the pulley diameter of the split pulley is changed to perform continuously variable speed. A joint is fitted into the space formed between the boss part of the pulley and the boss part of the movable pulley and the shaft so that it can rotate freely relative to the shaft and slide in the axial direction, and moves with the fixed pulley through the joint. Since the pulleys are configured to rotate integrally, the space formed between the boss part and the shaft of the fixed pulley and movable pulley can be effectively used to arrange the joints, which eliminates the conventional method of using keys etc. The length of the pulley boss in the axial direction and the wall thickness in the radial direction can be set to be smaller than that of the conventional pulley boss, and the split pulley can be configured in the minimum space, reducing the overall volume and cost. However, it is possible to reliably prevent loss of transmission torque transmitted to the shaft, and during assembly, each part such as the fixed pulley, movable pulley, and joint is filled with grease. Since assembly can be performed, ease of assembly can be improved, and furthermore, when a small transmission torque is required due to differences in engines, etc., this can be done by removing the joint, which is extremely convenient.

[Brief explanation of the drawing]

Figure 1 is an overall side view of the tailor equipped with the present invention, Figure 2 is a sectional view of the main parts of the split pulley when the diameter is small, and Figure 3 is the main part of the split pulley when the diameter is large. Fig. 4 is a perspective view of the joint, Fig. 5 is a sectional view showing how the joint is installed, Fig. 6 is a front view of the continuously variable transmission moving cam, and Fig. 7 is a sectional view of the joint.
The figure is a sectional view of a conventional example. In the figure, 5 is the shaft, 6 is the split pulley, 7 is the belt,
9 is a fixed pulley, 9' is a fixed pulley boss part, 10
10' is a moving pulley, 10' is a moving pulley boss, 11
is the joint, and a is the space.

Claims (1)

[Scope of utility model registration request] In a belt type continuously variable transmission device in which a split pulley consisting of a fixed pulley and a movable pulley is provided on the shaft and the pulley diameter of the split pulley is changed to perform continuously variable transmission, the boss portion of the fixed pulley and the movable pulley are A joint is fitted into the space formed between the boss part and the shaft so that it can rotate freely relative to the shaft and slide in the axial direction, so that the fixed pulley and the movable pulley rotate integrally through the joint. A split pulley in a belt type continuously variable transmission characterized by the following configuration.