JPS62141363A - Cooling device for belt type continuously variable transmission - Google Patents

Abstract

PURPOSE:To prevent the undesirable influence of the frictional heat onto a belt by installing blowing fans onto the pulleys of a belt type continuously variable transmission used for automobile and efficiently cooling the pulleys. CONSTITUTION:Blowing fans 54 and 64 are installed integrally onto the side surfaces of the fixed sheeves 51 and 61 of the pulleys 5 and 6. Ducts 15 and 22 for introducing the outside air the opened, opposed to the both blowing fans 54 and 64. The air introduced by the both blowing fans 54 and 64 cools the fixed sheeves 51 and 61, and further cools the movable sheeves 52 and 62 of the opponent pulleys 5 and 6 by the aid of air introducing passages R1 and R2.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling device for a belt-type continuously variable transmission used to transmit power from an automobile engine to drive wheels.

(Prior art) In general, this type of belt type continuously variable transmission was developed, for example, in Japanese Patent Application Laid-open No. 5
As shown in Japanese Patent Application No. 8-43862, a drive pulley consisting of a drive sheave and a movable sheave is provided on a drive shaft that interlocks with the engine, and a driven pulley that is mounted parallel to the drive shaft and interlocks with the drive wheel. A driven pulley consisting of a fixed sheave and a movable sheave is also provided on the shaft, and an endless belt is wound between these two pulleys. The rotational power transmitted from the driving pulley side to the driven pulley side is changed steplessly (linearly).

(Problems to be Solved by the Invention) In the above-described continuously variable transmission, when power is transmitted by the belt, frictional heat is generated at the contact portion between the belt and both IJs. If the belt is made of heat-sensitive synthetic resin or rubber, for example, the frictional heat may have an adverse effect on the belt, leading to early deterioration of the belt.

The present invention has been developed in view of the above-mentioned circumstances, and its object is to provide a belt-type continuously variable transmission that can efficiently cool both pulleys by effectively utilizing the rotational force of the pulleys. There is no provision for cooling equipment.

(Means for Solving the Problems) In order to achieve the above objects, the present invention provides a drive pulley consisting of a fixed sheave fixed to a drive shaft and a movable sheave movable in the axial direction with respect to the drive shaft, and a driven shaft. A belt-type continuously variable transmission in which a driven pulley consisting of a fixed sheave fixed to and a movable sheave movable in the axial direction with respect to the driven shaft, and a belt spanning both these pulleys are housed in a housing,
A blower fin is provided on one side of the drive pulley and the driven pulley for sucking outside air into the housing and blowing it out in the radial direction of the pulley. An air guide path was formed to guide outside air to the side of the other pulley.

(Function) According to the present invention, outside air is introduced into the housing through the blower fins by the rotation of the pulley, cools the boob provided with the blower fins, and then passes through the air guide path to the other side. It also cools the pulley by guiding it to the side of the pulley.

(Example) A cooling device for a belt type continuously variable transmission according to the present invention will be described below based on an example shown in the drawings.

In the figure, (1) is a housing that houses an engine (not shown) and a belt type continuously variable transmission side by side in the vehicle width direction, and the inside of the housing (1) is connected to the engine side by a first side wall (11). The first is located and houses the gear mechanism (G).
a storage chamber (Sl) and a second storage chamber (Sl) located on the opposite side of the engine with the first storage chamber (Sl) in between and housing the continuously variable transmission;
The housing (1) is divided into a storage chamber (S2) and a storage chamber (S2).
) in the second storage chamber (S2) with a side cover (
2), and the side wall of the side cover (2) is closed by
A second side wall (12) faces the first side wall (11).

Further, the continuously variable transmission stored in the second storage chamber (S2) is
A drive shaft (3) linked to the engine and a driven shaft (4) linked to drive wheels (not shown) are mounted parallel to each other from the first side wall (11) to the second side wall (12). A drive pulley (5) is attached to the drive shaft (3), and a drive pulley (5) is attached to the drive shaft (4).
) and the driven pulleys (6) respectively, and a synthetic resin belt (7) is installed between these two boos U (5) and (6).
is hung endlessly.

The drive pulley (5) is arranged in the axial direction of the drive shaft (3).
A fixed sheave (5) fixed to the first side wall (11) at the side.
1) and a movable sheave (52) movably assembled to the second side wall (12) side of the drive shaft (3), and the driven pulley (6) is connected to the driven shaft (4). Said second
The movable sheave (
A fixed sheave (61) fixed at a position facing the drive pulley (5) is moved to a position facing the fixed sheave (51) of the drive pulley (5) on the first side wall (11) side of the driven shaft (4). It consists of a movable sheave (62) that can be assembled.

In the embodiment shown in the figure, a torque cam mechanism (53) is provided on the movable sheave (52) side of the drive pulley (5),
moving the movable sheave (52) relative to the fixed sheave (51) by operation of the torque cam mechanism (53);
While changing the pulley ratio of the driving pulley (5), an oil passage (41) communicating with a hydraulic operating mechanism (not shown) is formed in the driven shaft (4), and the driven pulley (6) A control oil chamber (63) communicating with the oil passage (41) is provided on the side of the movable sheave (62), and pressure oil is supplied and discharged to and from the control oil chamber (63) by the hydraulic operation mechanism. The movable sheave (62) is moved relative to the fixed sheave (61) to change the pulley ratio of the driven pulley (6).

In the continuously variable transmission (M) configured as described above, in the embodiment shown in the figure, the outer surface of the side cover (2) constituting the housing (1), in other words, the second side wall (12). An auxiliary cover (21) is attached to the outside to form a chamber (C) between the auxiliary cover (21) and the side cover (2), and a duct (22) is inserted into the chamber (C). While connecting one end, the duct (22
) is connected to the outside of the vehicle body so that cold outside air from outside the vehicle body is supplied to the chamber (C) through the duct (22).

The side wall of the side cover (2), that is, the second side wall (12) has a plurality of holes arranged around the bearing circle of the driven shaft (6) to communicate the chamber (C) and the second storage chamber (S2). A through hole (13) is bored through the duct (2).
2) into the second storage chamber (S2) through the through hole (13) and the fixed sheave (61) in the driven pulley (6).
It can be introduced into the outer center of the.

Further, the chamber (C) is located at the axis of the drive shaft (3).
An outside air introduction passage (31) consisting of a shaft hole extending from the shaft end facing the first side wall (11) is formed, and the introduction passage (31)
31) has one end opened into the chamber (C), and the other end opened near the fixed sheave (52) of the drive pulley (5) in the storage chamber (S2), and the fixed part facing the opening; A plurality of through holes (51a) are formed at the base of the sieve (51) to direct outside air flowing into the chamber (C) from the introduction passageway (3) to the through holes (51).
a) into the second storage chamber (S2) and into the outer center of the fixed sheave (51) in the drive pulley (5).

In addition, the fixed sheave (5) constituting each of the aforementioned boo
1) spirally curved blower fins (54) (64) are integrally formed on the side surfaces of (61), respectively, so that the outside air introduced into the lateral center of each fixed sheave (51) (81); As the fixed sheaves (51) and (61) rotate, the blower fins (54) and (64) rotate so that air is blown radially outward and acts on the opposing movable sheaves (82 and 52). On the other hand, each of the above-mentioned pulleys (5) (6)
Spiral curved blower fins (55) (65) are integrally formed on the side surfaces of the movable sheaves (52) (62) constituting the movable sheaves (52) (62). 61) From (51) to the first and second sections below.
The outside air sent through the air guide path (R1) (R2),
The rotation of the blower fins (55) (65) with the rotation of the movable sheave (52) (62) causes the blower fins (
54) Similarly to (64), the housing (1
) It is designed to be discharged outside.

On the other hand, both the boots IJ (5) (+3
), and a guide plate (24) fixed at a predetermined distance from the inclined wall (23).
), and a gap between the guide plate (24) and the inclined wall (23) is provided with a fixed sheave (6) of the driven pulley (6).
The outside air blown from the blower fins (64) provided in the drive pulley (5) is transferred to the movable sheave (52) in the drive pulley (5).
A part of the peripheral wall (2a) of the side cover (2) facing the movable sheave (52) is partially cut out to form a first air guide path (R1). serves as a first exhaust port (25).

Further, in the embodiment shown in the figures, a partition plate (8) having an approximately disc-like shape facing the fixed sheave (51) of the drive pulley (5) is provided on the first side wall (11). The partition plate (80) is fixed at a predetermined distance from the inner surface of the housing (80) to form an outside air introduction passage (S) between the partition plate (8) and the first side wall (11). 1), the outside air introduction passage (S) is connected to the outer peripheral wall of the housing (1).
By forming a first opening (14) that opens to the outside and communicating the first opening (14) with the outside of the vehicle body via the duct (15), The outside air from outside the vehicle body is introduced into the outside air introduction passageway (S).

The outside air introduction passage (S) is connected to the center of the partition plate (8) through the fixed sheave (S) in the drive pulley (5).
51), a circular second opening (81) is formed on the outer surface facing the first side wall (11) and opens at the center in the radial direction, and the outside air is introduced from the first opening (14). While the outside air flowing into the passageway (S) can be introduced into the outer surface of the fixed sheave (51) and the radially central portion through the second opening (81), the partition plate (8) On the driven pulley (6) side, there is provided an outlet (82) for the outside air which is blown outward in the radial direction by the rotation of the blower fin (54) formed on the drive sheave (51), and from the outlet (82). a guide portion (83) extending to the outer center of the movable sheave (62) in the driven pulley (6), and a gap between the guide portion (83) and the first side wall (11); a second air guiding path (R2) that guides outside air blown radially outward by the air blowing fins (54) of the driving pulley (5) to the lateral center of the movable sheave (62) of the driven pulley (6); It has become.

In addition, (16) in the figure indicates a radially outward blowing fin (65) on the movable sheave (62) side that is blown out of the outside air in the housing (1) as the driven pulley (6) rotates. The guide rib (16) is integrally formed with the first side wall (1 piece).

Next, the operation of the cooling device having the above configuration will be explained.

As the vehicle travels, cold outside air from outside the vehicle body flows into the chamber (C) and the outside air introduction passageway (S) through the ducts (22) and (15), while inside the housing (1). In this case, a pumping action is exerted by the rotating action of the blower fin (64) accompanying the rotation of the driven pulley (6), and the outside air flowing into the chamber (C) passes through the through hole (13). , a fixed sheave (
51) The air is sucked in to the sides and centrally, and is blown outward in the radial direction by the rotation of the blower fins (64).

As described above, the outside air blown outward in the radial direction by the rotation of the blower fins (64) passes through the first air guide path (R1) to the movable sheave (52) in the drive pulley (5). The first exhaust hole (25) is guided to the center of the side and further passes through the side of the movable sheave (52) by the pump action accompanying the rotation of the blower fins (55) of the movable sheave (52). When this outside air flows through the housing (1), the fixed sheave (51) of the driven pulley (5) and the movable sheave (32) of the drive pulley (3) are is efficiently cooled.

Furthermore, in the housing (1), a pumping action is exerted by the rotation of the fixed sheave (51) accompanying the rotation of the drive pulley (5), and the outside air flowing into the chamber (C) is pumped. From the introduction passageway (31) to the through hole (
51a) and into the central part of the side of the fixed sheave (31) of the drive pulley (3) in the housing (1), and at the same time the outside air that has flowed into the outside air introduction passageway (S) is also After passing through the second opening (81) and being sucked into the lateral central part of the fixed sheave (51), it is blown out radially outward through the blower fins (54), and the air outlet ( 82) into the second air guide path (R2).

The outside air sent into the second air guide path (R2) is further directed to the lateral center of the movable sheave (62) by the pump action accompanying the rotation of the air blower fin (65) of the driven pulley (6). After being sucked in, the outside air is blown out in the radial direction, and guided by the guide rib (16) to the outside of the housing (1) through the second outlet (17) at t-+h. During the flow inside the housing (1), the fixed sheave (51) of the driving pulley (5) and the movable sheave (62) of the driven pulley (6) are cooled.

(Effects of the Invention) As described in "2" below, the present invention comprises a drive pulley consisting of a fixed sheave fixed to a drive shaft and a movable sheave movable in the axial direction with respect to the drive shaft, a fixed sheave fixed to a driven shaft, and a movable sheave fixed to the driven shaft. In a belt-type continuously variable transmission in which a driven pulley consisting of a movable sheave that is movable in the axial direction relative to the shaft and a belt spanning both pulleys are housed in a housing, one side of the drive pulley and the driven pulley A blower fin is provided in the housing to suck outside air into the housing and blow it out in the radial direction of the pulley, and an air guide is provided in the housing to guide the outside air blown out by the blower fin to the side of the other pulley. By forming the air passage, outside air can be introduced into the housing through the ventilation fins by rotation of the pulley, and after the introduced outside air cools the pulley provided with the ventilation fin, the air guidance passage is is guided to the side of the other pulley via the
- At the same time, it has become possible to efficiently cool both pulleys.

[Brief explanation of drawings]

The drawings show an embodiment of the cooling device according to the present invention; FIG. 1 is a partially cutaway front view thereof, FIG. 2 is a side view of a side cover, and FIG. 3 is a diagram showing FIG. 2 A-B-C-D- FIG. 4 is a sectional view taken along line E-F-G, FIG. 4 is a sectional view taken along line HH in FIG. 2, FIG. 5 is a view taken along arrow J in FIG. 2, and FIG. (1)... Housing (3)... Drive shaft (4)... Driven shaft (5)... Drive pulley (6)... ...Followed pulley (7) ...Belt (54) ...Blower fin (R1) ...Air guide path

Claims (1)

[Claims] A drive pulley consisting of a fixed sheave fixed to a drive shaft and a movable sheave movable in the axial direction relative to the drive shaft, and a driven pulley consisting of a fixed sheave fixed to the driven shaft and a movable sheave movable axially relative to the driven shaft. This is a cooling device for a belt-type continuously variable transmission in which a housing is equipped with a belt that spans both pulleys, and a belt that extends between the two pulleys. A blower fin is provided to blow the air outward in the radial direction of the pulley, and an air guide path is formed in the housing to guide outside air blown by the blower fin to the side of the other pulley. Cooling device for belt type continuously variable transmission.