JPH02159452A - Continuously variable transmission for vehicle - Google Patents

Abstract

PURPOSE:To make it possible to reduce the size of a transmission provided with a fluid coupling and facilitate the layout of the transmission by disposing a brake working body in a recess formed with a support portion of a brake side casing for supporting a support bearing of an output shaft. CONSTITUTION:A support portion 60a for supporting a bearing 64 is formed in a brake side casing 60. A brake piston 76 as a working body for brake and constituting a working mechanism 74 for actuating a brake mechanism 42 is housed in a recess 72 formed with the support portion 60a and an outer surrounding portion 60b located in the axial direction of an output side shaft 46. As a result, a specific space is not necessary for installing a brake piston 76 and the installation space therefor is saved. Thus a compact continuously variable transmission 2 is formed with a reduced overall length which can be installed in an engine compartment of a limited size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuously variable transmission for a vehicle, and particularly to a continuously variable transmission for a vehicle that can be configured compactly even when a fluid coupling is provided.

[Conventional technology]

In a vehicle, a transmission is interposed between an internal combustion engine and drive wheels. This transmission changes the driving force and running speed of the drive wheels in accordance with the widely varying running conditions of the vehicle, thereby making full use of the performance of the internal combustion engine. The transmission includes, for example, a fixed pulley part fixed to a rotating shaft and a movable pulley part attached to the rotating shaft so as to be able to approach and separate from the fixed pulley part. By decreasing or increasing the groove width using hydraulic pressure, the rotation radius of the belt wrapped around the boob is decreased or increased, power is transmitted, and the gear ratio (
There is a continuously variable transmission that changes the belt ratio.

As such a continuously variable transmission, for example, JP-A-59-1
It is disclosed in Japanese Patent No. 26145. The system described in this publication changes the reduction ratio of the reduction ratio control mechanism to the rotation speed set on the amplifier shift side when the rotation speed becomes larger than the set rotation speed range, and also changes the rotation speed to the set rotation speed. When the speed becomes smaller than the range, the reduction ratio of the reduction ratio control mechanism is changed to the speed set for the downshift side, and the acceleration feeling due to the increase in engine speed and the responsiveness of the increase in torque when pressing the accelerator pedal are improved. This is to improve the speed change control and prevent hunting caused by shift control.

Further, in continuously variable transmissions, it has been considered to provide a fluid coupling that changes the direction of rotation of the belt to move the vehicle forward or backward. This fluid coupling has a pump impeller connected to the internal combustion engine side, a stator impeller whose rotation is prevented by a brake mechanism, and a turbine impeller fixed to the output side shaft connected to the pulley side, By allowing or blocking rotation of the stator impeller, the turbine impeller is rotated in forward and reverse directions, changing the direction of rotation of the belt, thereby moving the vehicle forward or backward.

[Problem that the invention seeks to solve]

However, in a continuously variable transmission equipped with a fluid coupling, there is a brake mechanism that allows or prevents rotation of the stator impeller in order to change the rotation direction of the turbine impeller of the fluid coupling, and an actuation mechanism that operates this brake mechanism. , etc. are simply installed in parallel along the length of the aircraft, so the overall length of the continuously variable transmission becomes long to ensure space for parts installation.
Continuously variable transmissions have become larger, making it difficult to layout them in the limited space of the engine room, resulting in practical disadvantages.

[Purpose of the invention]

Therefore, the purpose of this invention is to eliminate the above-mentioned disadvantages.
By providing the brake actuation body of the actuation mechanism that operates the brake mechanism in the recess formed by the holding part of the brake side casing that holds the bearing in which the output side shaft of the fluid coupling is supported, it is possible to To realize a continuously variable transmission for a vehicle that can be miniaturized and easily realize the layout of a continuously variable transmission.

[Means for solving problems]

In order to achieve this object, the present invention reduces and increases the groove width between the fixed pulley part and the movable pulley part, which is attached to the fixed pulley part so as to be able to move toward and away from the fixed pulley part, using hydraulic pressure. In a continuously variable transmission for a vehicle that performs speed change control to change the gear ratio by decreasing or increasing the rotation radius of a belt wrapped around both pulleys, rotation is prevented by a pump impeller and a brake mechanism connected to the internal combustion engine side. A fluid having a stator impeller fixed to an output shaft connected to the pulley side, and allowing or blocking the rotation of the stator impeller, thereby allowing the turbine impeller to rotate in forward and reverse directions. A brake side casing is provided in which a joint is provided and the brake mechanism is attached thereto, and a recess formed by a holding portion of the brake side casing that holds a bearing on which the output side shaft is supported is provided with an operation for operating the brake mechanism. It is characterized by being provided with an actuating body for the brake of the mechanism.

[Effect]

According to the structure of the present invention, the brake actuating body of the actuating mechanism for actuating the brake mechanism is provided in the recess formed by the holding part of the brake side casing that holds the bearing on which the output side shaft is supported. It is being As a result, there is no need to install the brake actuating body in parallel with other parts in the continuously variable transmission, and the overall length of the continuously variable transmission equipped with the fluid coupling can be reduced, allowing the continuously variable transmission to be made smaller. . This small continuously variable transmission can be easily installed in the engine room, which is advantageous in terms of layout.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail and specifically based on concave surfaces.

1 to 6 show embodiments of this invention. In the figure, 2 is a continuously variable transmission for a vehicle, 4 is a driving pulley, 6 is a driven pulley, and 8 is a belt. The drive-side pulley 4 includes a drive-side fixed boob piece 14 fixed to the drive-side shaft 12 within the pulley-side housing 10, and a drive-side fixed boob piece 14 that is movable in the axial direction of the drive-side shaft 12 but not rotatable.
A drive side movable pulley piece 16 is attached to the drive side movable pulley piece 16, and the oil is guided to a drive side oil chamber 20 formed by a drive side housing 18 arranged on the back side of the drive side movable pulley piece 16. Drive side movable pulley part 16 by oil pressure
is moved in the axial direction of the drive side shaft 12, and the drive side groove 2 is moved between the drive side fixed pulley piece 14 and the drive side movable pulley piece 14.
This is to increase or decrease the width of 2.

Further, the driven side pulley 6 includes a driven side fixed boob piece 26 fixed to the driven side shaft 24, and a driven side fixed bobbin piece 26 that is movable in the axial direction of the driven side shaft 24 but not rotatable. The driven side movable pulley piece 28 is attached to the driven side movable pulley piece 28, and oil is introduced into a driven side oil chamber 32 formed by a driven side housing 30 arranged on the back side of the driven side movable pulley piece 28. The driven side movable pulley piece 28 is moved in the axial direction of the driven side shaft 24 by this oil pressure, and the driven side groove between the driven side fixed pulley piece 26 and the driven side movable pulley piece 28 is moved. The width of 34 is increased or decreased. Further, a pressing spring 36 is contracted in the driven side oil chamber 32 and presses the driven side movable pulley piece 28 in the direction of expansion of the driven side oil chamber 32 .

A heald 8 is disposed in the drive side groove 22 of the drive side pulley 4 and the driven side groove 34 of the driven side pulley 6, and this belt 8 is tensioned between the drive side pulley 4 and the driven side pulley 6. .

Inside the housing 38 on the internal combustion engine side of the continuously variable transmission 2, there is a pump impeller 40 connected to the internal combustion engine (not shown) side, a stator impeller 44 whose rotation is prevented by a brake mechanism 42, and a drive on the pulley side. Output side shaft 46 connected to side shaft 12
By allowing or blocking the rotation of the stator impeller 44, the turbine impeller 48 can be rotated in the forward and reverse directions, and the output shaft 46 can be rotated in the forward and reverse directions, thereby controlling the rotation of the belt 8. A fluid coupling 50 is provided to change the direction. That is, a drive plate 54 that drives the fluid coupling 50 is fixed to an internal combustion engine side shaft 52 that is connected to the internal combustion engine. This fluid coupling 50 includes a coupling side housing 5
6 includes the pump impeller 40, stator impeller 44, and turbine impeller 48. The pump impeller 40 is connected to a drive plate 54 via a joint housing 56. Further, the stator impeller 44 is connected to the brake mechanism 42 attached to the inner surface of the brake side casing 60 located between the boob side housing IO and the joint side housing 56 via the first communication body 58. Thereby, the stator impeller 44 can be locked to and separated from the brake side casing 60 depending on the operating state of the brake mechanism 42.

Furthermore, a direct coupling clutch 62 is disposed within the joint housing 56 and is capable of engaging and separating the joint housing 56 and the turbine impeller 48 . In other words, this direct coupling clutch 62 can directly couple the internal combustion engine side shaft 52 and the output side shaft 64.

Further, the other end of the output shaft 46 to which the turbine impeller 48 is fixed is supported by an intermediate bearing 64. Further, a second connecting body 66 is fixed to this output side shaft 46, and this second connecting body 66 is connected to a neutral clutch 68.

This neutral clutch 68 is operated by oil pressure, and disconnects and disconnects the relationship between the output side shaft 46 and the drive side shaft 12. As a result, the turbine impeller 48 can be connected to and connected to the drive-side fixed booby piece 14 by the neutral clutch 68 . That is, the neutral clutch 68 is connected to the turbine impeller 4
The power transmitted from 8 to the output shaft 46 is transferred to the drive pulley 4
, engages the subsequent power transmission device via the driven pulley 6.
It separates and creates neutrality.

The forward and reverse rotation of the turbine impeller 48 of the fluid coupling 50 is as follows:
This is done as shown in Figure 5.6. That is, when the brake mechanism 42 is separated from the brake side casing 60, rotation of the stake impeller 44 is allowed, oil passes between the blades of the stator impeller 44, and the turbine impeller 48 is moved in the same direction as the pump impeller 40. , that is, rotate it in the positive direction (
(See Figure 5). On the other hand, when the brake mechanism 42 is locked to the brake side casing 60, the rotation of the stator impeller 44 is prevented, and the direction of the kinetic energy of the oil sent out from the pump impeller 48 is fixed. , oil flows in from the back side of the blades of the turbine impeller 48, and the rotation of the turbine impeller 48 becomes opposite to that of the pump impeller 40 (see FIG. 6). Therefore, the output shaft 4 fixed to the turbine impeller 48
6, that is, the rotational direction of the belt 8, are both performed via the turbine impeller 48, so that the drive/neutral state can be maintained by engaging/disengaging the neutral clutch 68. .

Furthermore, the joint-side housing 56 integrated with the pump impeller 48 is directly connected to the oil pump 70, so that the oil pump 70 is directly driven by the internal combustion engine-side shaft 52.

In addition, as shown in Fig. 2.3, the brake side casing 6
A holding portion 60a that supports a bearing 64 is formed in the holding portion 60a. The recessed portion 72 formed by the holding portion 60a and the outer envelope portion 60b located in the axial direction of the output shaft 46 includes:
A brake piston 76, which is a brake actuating body constituting an actuating mechanism 74 that actuates the brake mechanism 42, is accommodated.

This brake piston 76 is moved between the first sliding surface 60e of the holding part 60a and the outer envelope part 60b, which are located in parallel, by oil pressure from an oil introduction passage 78 formed in the side part 60c.
It is movable in the axial direction of the output shaft 46 along the second sliding surface 60f of the neutral clutch 68, and comes into contact with the tip 80a of the operating ring 80 located on the outside of the neutral clutch 68. This is to control the operation of the brake mechanism 42. That is, the actuation mechanism 74 is composed of a brake piston 76 and an actuation ring 80.

Further, the movement of the brake piston 76 is stopped by a stopper 81.

The continuously variable transmission 2 performs speed change control to continuously change the gear ratio by decreasing or increasing the rotation radius of a belt 8 wound around a driving pulley 4 and a driven pulley 6.

In addition, a reduction drive gear 82 is attached to the driven side shaft 24.
A reduction drive gear 82 is fixedly installed on a support shaft 84 or engaged with a reduction driven gear 86. Further, a final drive gear 88 is fixed to this support shaft 84.
8 is meshed with a final gear 92 of a differential unit 90. This differential unit 9
0 is in communication with the wheels (not shown).

Next, the operation of this embodiment will be explained.

When the internal combustion engine operates, the internal combustion engine side shaft 52 rotates, and as the internal combustion engine side shaft 52 rotates, the drive plate 5 rotates.
4 rotates and drives the fluid coupling 50.

In this fluid coupling 50, when the brake mechanism 42 is separated from the brake side casing 60 via the operating ring 80 due to movement of the brake piston 76 operated by oil pressure, the direct coupling clutch 62 is also in a separated state. ,
In addition, the stator impeller 44 is in a rotating state, and the oil passes between the blades of the stator impeller 44 and acts on the blades of the turbine impeller 4, thereby causing the turbine impeller 48 to move in the same direction as the pump impeller 40. In other words, it rotates in the forward direction (see Figure 5). This causes the vehicle to move forward.

On the other hand, when the brake mechanism 42 is engaged with the brake side casing 60, the direct coupling clutch 62 is connected to the brake mechanism 4.
2, the stator impeller 44 is in a locked state, and the stator impeller 44
Since the rotation of the stator impeller 44 is stopped, the oil flows into the stator impeller 44.
The rotation of the turbine impeller 48 is reversed by the rotation direction of the pump impeller 40 , and the oil flows in from the back side of the blade of the turbine impeller 48 . (See Figure 6). This causes the vehicle to move backward.

Also, at this time, the oil pump 70 is connected to the internal combustion engine side shaft 52.
The oil pan absorbs oil from an oil pan (not shown) and supplies it to the fluid coupling 50 and other parts.

The continuously variable transmission 2 includes a drive side groove 2 of the drive side pulley 4.
2 and the width of the driven side groove 34 of the driven side pulley 6, the rotation radius of the belt 8 is decreased or increased to steplessly change the speed ratio.

As a result, the power of the internal combustion engine is input from the internal combustion engine shaft 52, and the rotating direction of the belt 8 is determined by the forward/reverse rotating direction of the turbine impeller 48 of the fluid coupling 50. The signal reaches the side pulley 6, passes through a reduction drive gear 82, a reduction driven gear 86, a final drive gear 88, and a final gear 92, and then is branched by a differential unit 90 and transmitted to each wheel.

By the way, in this embodiment, since the brake piston 76 is housed in the part 72 of the brake side casing 60, no special installation space is required for the brake piston 76, and therefore the installation space can be saved. Therefore, the overall length of the continuously variable transmission 2 can be reduced, and a compact continuously variable transmission a2 can be configured. Thereby, the continuously variable transmission 2 can be easily installed in an engine room with a limited size.

〔Effect of the invention〕

As is clear from the above detailed description, according to the present invention,
The hydraulic joint is equipped with a brake actuating body of an actuating mechanism that operates the brake mechanism in the recess formed by the holding part of the brake side casing that holds the bearing in which the output side shaft of the fluid joint is supported. The continuously variable transmission can be miniaturized and the layout of the continuously variable transmission can be easily achieved.

[Brief explanation of the drawing]

1 to 6 show examples of the present invention, FIG. 1 is a schematic explanatory diagram of a continuously variable transmission equipped with a fluid coupling, and FIG. 2 is a detailed diagram of a continuously variable transmission equipped with a fluid coupling. , Fig. 3 is an enlarged view of the main parts of Fig. 2, Fig. 4 is a diagram of the shaft arrangement of the continuously variable transmission, Fig. 5 is an explanatory diagram of the turbine impeller rotating in the forward direction, and Fig. 6 is the turbine It is an explanatory view in a state where an impeller rotates in the opposite direction. In the figure, 2 is a continuously variable transmission, 4 is a driving pulley, 6 is a driven pulley, 8 is a heald, 40 is a pump blade, 42
is a brake mechanism, 44 is a stator impeller, 46 is an output side shaft, 48 is a turbine impeller, 50 is a fluid coupling, 60 is a brake side casing, 60a is a holding part, 62 is a direct clutch, 64 is a bearing, 68 is a neutral Clutch, 70 is an oil pump, 72 is a recess, 74 is an operating mechanism, 76 is a brake piston, and 80 is an operating ring. Engraving of the drawing, Figure 1

Claims (1)

[Claims] 1. The groove width between the fixed pulley piece and the movable pulley piece attached to the fixed pulley piece so as to be able to move toward and away from the fixed pulley piece is increased or decreased by hydraulic pressure, and the belt that is wound around the two pulleys is rotated. In a continuously variable transmission for a vehicle that performs speed change control to change the speed ratio by decreasing or increasing the radius, a pump impeller connected to the internal combustion engine side, a stator impeller whose rotation is prevented by a brake mechanism, and a stator impeller connected to the pulley side are connected. a turbine impeller fixed to an output side shaft provided with the stator, and a fluid coupling that allows the turbine impeller to rotate in forward and reverse directions by allowing or blocking rotation of the stator impeller, and the brake mechanism is attached thereto. A brake side casing is provided, and a brake actuating body of an actuation mechanism for actuating the brake mechanism is provided in a recess formed by a holding portion of the brake side casing that holds a bearing on which the output side shaft is supported. A continuously variable transmission for vehicles featuring the following.