JPH0478355A - Friction type continuously variable transmission - Google Patents

Abstract

PURPOSE:To improve assembling performance through simplifying structure and reducing the number of parts by supporting a taper corn autorotatably by such engagement structure as to insert/pull-out both supporting members by the relative shift of a main spindle to form a carrier. CONSTITUTION:A taper corn 15 is brought into pressure contact with an output rotor 16 pressed/energized by cam mechanism 18, and its reaction is received by a disc-shape corn support 19. A carrier 22 is formed of the outer frame 20 of an outer supporting member spline-fitted to the periphery of an input rotor 11 and the inner frame 21, paired with the outer frame 20, of an inner supporting member, and the taper corn 15 is autorotatably supported through a supporting shaft 23. both frames 20, 21 are thus engaged with each other in the integrally rotatable state by such engagement structure as to be inserted and pulled out by the relative shift in the axial direction of an output shaft 14.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a plurality of tapered cones around a main shaft that are driven to revolve around the axis of the main shaft, and The present invention relates to a friction type continuously variable transmission in which transmission members that can be shifted in the axial direction are in contact with each other.

[Conventional technology]

This type of friction type continuously variable transmission was previously proposed in Japanese Patent Application No. 1-313806 filed by the present applicant. The inner support member connected and supported by the member with a pin constituted a carrier that supported and revolved the taper cone freely on its axis.

[Problem to be solved by the invention]

According to the prior art, the pin is inserted from the outside of the outer support member, but due to the arrangement with the dividing surface of the transmission case, the pin is inserted before inserting the outer support member into the transmission case. It is necessary to do so. However, when the pin is inserted into the outer support member, the cone support for supporting the tapered cone placed between both support members cannot be attached later, so the outer support member is fixed to the input rotating body, and The cone support, which is externally fitted onto the main shaft, must be assembled in advance and then inserted into the transmission case, making the assembly process extremely troublesome and troublesome.

The present invention aims to eliminate the above-mentioned problems.

[Means to solve the problem]

In order to achieve the above object, the present invention provides the friction type continuously variable transmission described at the beginning with a support shaft that passes through the tapered cone, and connects both penetrating protrusions of the support shaft to separate support members. one support member is connected to an input rotating body for revolving the taper cone, and the other support member is pivotally supported in a state in which movement in the axial direction of the main shaft is restricted; Further, these supporting members are integrally rotatably engaged by a meshing structure that is inserted and removed by relative shift in the axial direction of the main shaft, thereby forming a carrier that rotatably supports and revolves the tapered cone. It is characterized by

[For production]

According to the above configuration, the outer supporting member is supported by the input rotary body, and the inner supporting member is also restricted from moving in the axial direction of the main shaft, so that the axial center of the main shaft when both supporting members are attached is The spacing in the direction is now maintained constant, resulting in an interlocking structure that allows insertion and removal by relative shifts in the axial direction, in other words, it is possible to rotate both support members together by simply sliding them relative to each other. Ta.

This configuration does not require a conventional connecting pin, so first set the input rotating body in the transmission case, then attach the outer support member to the manual rotating body, and then connect the main shaft, cone support, and inner The supporting member and the tapered cone with support shaft can be assembled one after another, so for example, the transmission case can be assembled one by one with the transmission case placed on the assembly table, eliminating the need for preliminary assembly. This makes assembly work easier.

〔Effect of the invention〕

Therefore, by devising the structure of the carrier, we were able to improve the ease of assembly without the disadvantages of complicating the structure or increasing the number of parts. We were able to provide a transmission.

〔Example〕

Examples of the friction type continuously variable transmission according to the present invention are as follows:
A case will be described in which the present invention is incorporated into a transmission device of a tractor for mowing lawns.

As shown in FIG. 1, the transmission device (A) includes a power input section (B) that inputs the power of an engine (not shown) through a belt transmission mechanism (7), and a friction type stepless transmission that continuously changes the speed of the input power. It is equipped with a transmission (hereinafter abbreviated as CT) (C), a forward/reverse switching mechanism (D) that can switch the direction of rotation of driving power after passing through the CVT (C), a differential mechanism (E), etc. It is composed of

The power input section (B) has a vertical shaft (
lO) and CVT (C) (7) input rotating body (1
The input rotating body (1) is constructed by interlocking the input rotating body (1) with a bevel gear.
The shaft portion (12) of 1) is extended and protrudes outside the transmission case (13) to form a PTO shaft (F).

The CVT (C) rotates the axis of the output shaft (14) around the output shaft (14), which is the main shaft, by means of an input rotating body (11) arranged concentrically with the output shaft (14). Multiple rotatable tapered cones (
15), and an output rotating body (16) that is driven and rotated by contacting these tapered cones (15) is connected to the output shaft (
14) and those tapered cones (14).
5) A transmission member (17) that can be shifted in the axial direction
It is configured by providing. The output shaft (14) has one end supported by a bearing inside the input rotating body (If). The tapered cone (15) is in pressure contact with the output rotary body (16) which is biased by the cam mechanism (18), and its reaction force is received by the tapered cone support (19), and the input rotary body The carrier ( 22), and the taper cone (15) is rotatably supported via a support shaft (23).

The inner frame (21) is the cylindrical shaft part (8) of the cone support (19)
The snap ring (6
) for axial positioning.

The support shaft (23) has penetrating projections (23a) at both ends thereof.

(23b) is formed into an oval shape in cross section, and both frames (20)
.

By inserting it into the recesses (4) and (5) formed on the outer periphery of (21), it is supported in a non-rotating state.

As shown in the figure, the frames (20) and (21) are engaged with each other so as to be able to rotate together by a meshing structure that is inserted and removed by a relative shift I in the axial direction of the output shaft (14). That is, the inner frame (21) is constructed as an integrally molded cast iron component with a larger maximum diameter than the outer frame (20), and the plurality of engagement recesses (2) formed on the outer periphery of the outer frame (20) engage. A protrusion (3) is provided which engages with the protrusion.

[Another example]

As shown in Figure 2, the input rotating body (11) has a shaft (1).
The engine power may be input to this shaft portion ( ).

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the friction type continuously variable transmission according to the present invention, with FIG. 1 being an exploded sectional view of the transmission device, and FIG. 2 being a sectional view showing another embodiment of the power input section. (14) Main shaft, (15) Taper cone, (17) Speed change member, (20)
, (21)...Supporting member, (22)--
・−Carrier, (23) ・−・−・−Spindle, (23a
), (23b)...Protrusion.

Claims (1)

[Claims] A plurality of taper cones (15) are provided around the main shaft (14) and are driven to revolve around the axis of the main shaft (14), and a plurality of taper cones (15) are arranged around the main shaft (14), and a plurality of tapered cones (15) are provided around the main shaft (14). A friction-type continuously variable transmission in which a transmission member (17) that is shiftable in the axial direction is in contact with each other, and the support shaft (2) passes through the tapered cone (15).
3), and both penetrating protrusions (
23a) and (23b) are attached to separate support members (20) and (23b), respectively.
1), one support member (20) is connected to an input rotating body for revolving the taper cone (15), and the other support member (21) is connected to the axis of the main shaft (14). Pivotally supported with restricted movement in the center direction,
Further, these support members (20) and (21) are integrally rotatably engaged by a meshing structure that is inserted and removed by a relative shift in the axial direction of the main shaft (14), thereby causing the tapered cone (15) to rotate on its axis. A friction type continuously variable transmission comprising a carrier (22) that is freely supported and rotated.