JPH0740116Y2 - Cooling mechanism for continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cooling mechanism for a V-belt type continuously variable transmission of an internal combustion engine (hereinafter referred to as an engine).

(Prior Art) Conventionally, in a continuously variable transmission including an input / output pulley composed of a pair of separable sheaves and a V-belt wound between the output pulleys, the engine is loaded under high load and at high speed. ,
Since frictional heat is generated between the output pulley and the V-belt, which shortens the life of the V-belt, for the purpose of cooling, as shown in FIG. 4, fins 9 are provided on the back of each sheave 1, 2 of the input and output pulleys. There is one that is attached.

However, in such a conventional continuously variable transmission, the V belt and the input / output pulley are only cooled by heat exchange with the fluid around them, so that
The cooling effect is not sufficient under operating conditions where a lot of heat is generated between the belt and the input / output pulley, or when the V-belt slips, and the temperature of the V-belt and the input / output pulley rises, There are problems that seizure and burnout may occur, and the durability life may be shortened.

(Problems to be Solved by the Invention) In order to solve the above-mentioned problems, the present invention introduces a fluid, which is a cooling medium, into each sheave body of the input and output pulleys, which is a main heat radiation path for heat generated by the V-belt. An object of the present invention is to provide a cooling mechanism for a continuously variable transmission having a structure to be introduced.

(Means for Solving the Problems) The above object is to provide a V-belt wound around each conical surface of a fixed sheave 1 fixed to a shaft portion and a movable sheave 2 slidably fitted on the shaft portion. In the continuously variable transmission provided with 3, a fluid passage 4 having a filter is formed on the shaft portion on the inlet side along the axis, and the fluid passage 4 is provided at the positions of the fixed sheave 1 and the movable sheave 2. Is formed with a plurality of radial shaft portion fluid passage outlets 5 opening to the outer peripheral side of the shaft portion, and the main body of the fixed sheave 1 and the movable sheave 2 has an annular shape communicating with the shaft portion fluid passage outlet 5. Fluid passages 6 and a large number of radial fluid passages 7 connected to the fluid passages 6 and extending outward in the radial direction are provided. Further, the inner periphery of the shaft portion of the movable sheave 2 is provided while the movable sheave 2 slides. Also the shaft fluid passage outlet 5 and the fluid passage This is achieved by a cooling mechanism for a continuously variable transmission, characterized in that a shaft-shaped fluid passage 6a having a groove shape in the axial direction capable of maintaining communication with 6 is formed.

(Operation) In the continuously variable transmission cooling mechanism of the present invention, when a fluid as a cooling medium enters and flows into and out of the fluid passage in each sheave body through the fluid passage in each sheave shaft portion of the output pulley. First, the friction heat between the V-belt and the input / output pulley is absorbed to perform cooling.

(Embodiment) The present invention will be described in more detail with reference to the drawings showing an embodiment. FIG. 1 is a vertical sectional view of the input and output pulleys of the embodiment. The upper half of the center line shows the movable sheave 2 closest to the fixed sheave 1, and the lower half shows the movable sheave 2 farthest from the fixed sheave 1. Fixed sheave 1
The movable sheave 2 and the movable sheave 2 constitute a pulley that can be contacted and detached, and the V-belt 3 is wound around the groove formed by the conical surfaces of the fixed sheave 1 and the movable sheave 2 that face each other. A fluid passage 4 is provided at the center of the shaft portion of the fixed sheave 1, and a filter 8 is fitted to the inlet of the fluid passage 4. Fluid passage 4 of shaft
In the cross section at two locations in the axial direction, as shown in FIG. 2 which shows a typical A-A cross section, four axial fluid passage outlets 5 are provided in each cross section. An annular fluid passage 6 is formed at the base of the main body of the fixed sheave 1 and communicates with these shaft fluid passage outlets 5. Further, a large number of radial fluid passages are connected to the annular fluid passage 6 and extend radially outward. 7 is provided. On the other hand, the movable sheave 2 is also provided with an annular fluid passage 6 similar to the fixed sheave 1 and a radial fluid passage 7 connected thereto. In particular, in the case of the movable sheave 2, a cylindrical shaft portion is slidably inserted onto the shaft portion of the fixed sheave 1, and the inner periphery of the movable sheave 2 communicates with the outlet 5 even during sliding. A groove-shaped shaft portion fluid passage 6a that can be maintained is formed.

In the cooling mechanism of the continuously variable transmission configured as described above, the shaft fluid passage 4 of the fixed sheave 1 is passed through the filter 8.
The fluid introduced into the stationary sheave 1 flows from the passage outlet 5 into the annular fluid passage 6 of the fixed sheave 1, passes through the radial fluid passage 7 around the fixed sheave 1, and absorbs the heat of the fixed sheave 1 from the outer peripheral end of the fixed sheave 1. It leaks to the outside. Simultaneous movable sheave 2
Also, when the fluid flowing from the shaft fluid passage outlet 5 of the fixed sheave 1 into the shaft fluid passage 6a of the movable sheave 2 and the annular fluid passage 6 passes through the radial fluid passage 7, the heat of the movable sheave 2 is removed. It flows out from the outer edge. The above fluid is sent to the shaft passage 4 by pressurization,
Or, it should be sucked by centrifugal force due to the rotation of each sheave.

By forming the radial fluid passage 7 of each sheave in a curved shape as shown in FIG. 3, the flow path as a heat absorption surface becomes longer, and the cooling effect can be further enhanced.

Further, by further forming the fin 9 on the back surface of the sheave, which is the conventional cooling mechanism shown in FIG. 4, in the cooling mechanism according to the present invention, the cooling can be further promoted.

(Effect of the Invention) Since the present invention is the cooling mechanism for the continuously variable transmission having the above-described structure, the input and output pulleys and the V-belt wound between them are cooled by the fluid flowing outside them. At the same time, the fluid flows through the fluid passages provided in the sheave shaft according to the present invention into the fluid passages provided inside each sheave, absorbs the frictional heat of the sheaves, and flows out to the outside. Can be further raised to prevent seizure and burnout of the V-belt and pulley.

[Brief description of drawings]

1 is a vertical sectional view of a pulley provided with a cooling mechanism according to the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a sectional view similar to FIG. 2 of another embodiment. is there. FIG. 4 is a longitudinal sectional view showing a conventional pulley cooling mechanism. DESCRIPTION OF SYMBOLS 1 ... Fixed sheave 2 ... Movable sheave 3 ... V belt 4,6a ... Shaft fluid passage 5 ... Shaft fluid passage outlet 6 ... Annular fluid passage 7 ... Radial fluid passage

Claims (1)

[Scope of utility model registration request] 1. A continuously variable transmission comprising a fixed sheave 1 fixed to a shaft portion, and a V-belt 3 wound around each conical surface of a movable sheave 2 slidably fitted on the shaft portion. In the shaft part, a fluid passage 4 having a filter on the inlet side is formed along the axis, and the fixed passage 1 and the movable sheave 2 of the fluid passage 4 are opened to the outer peripheral side of the shaft portion. A plurality of radial axial fluid passage outlets 5 are formed, and an annular fluid passage 6 communicating with the axial fluid passage outlet 5 is formed in the main bodies of the fixed sheave 1 and the movable sheave 2. A large number of radial fluid passages 7 are provided which are connected to the passages 6 and extend outward in the radial direction. Further, the shaft portion fluid passage outlet 5 is provided on the inner periphery of the shaft portion of the movable sheave 2 while the movable sheave 2 is sliding. And axial direction capable of maintaining communication with the fluid passage 6 Shank fluid passage forming a groove
A cooling mechanism for a continuously variable transmission, characterized in that 6a is formed.