JPH01283455A - Continuously variable transmission - Google Patents

Abstract

PURPOSE:To enable the application of a simple, compact and lightweight mechanism by giving a driving function to a pulley at the side of an auxiliary machine, constituting the entire internal area of the movable pulley of the aforesaid pulley with a pressure chamber and introducing and discharging a high pressure fluid to and from the pressure chamber via the selection of passages with an electromagnetic valve for actuating the movable pulley. CONSTITUTION:When a magnet coil 17 is not energized, the first and second main passage holes 12a and 12b are continuous to the passage 16a of a valve body 16 and a high pressure fluid is fed to a pressure chamber 10 through a route shown by an arrow, thereby keeping a movable pulley 6 in a close condition. When the coil 17 is energized, the valve body 16 slides along a shaft 4 against the force of a spring 19 and the second main passage 12b is isolated from the passage 16a and made continuous to the passage 16b, thereby interrupting the supply of the high pressure fluid. In addition, the high pressure fluid within the pressure chamber 10 flows to a sub- passage hole 13 via the second main passage hole 12b, the passage 16b and a branch passage 13a, thereby moving the movable pulley to an open side. According to the aforesaid construction, a control unit 21 is used to control the timing and frequency of the supply and interruption of a power to and from the coil 17, thereby changing the gear ratio of an auxiliary machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuously variable transmission, particularly a hydraulically operated continuously variable transmission.

[Conventional technology]

In automobiles, the sleeping power of the engine is used to operate auxiliary equipment such as fans and air conditioner compressors. In this case, in order to reduce the auxiliary equipment loss, the auxiliary equipment is set to a higher specified rotation speed when the engine is rotating at low speed, and when the engine rotates at high speed, it is maintained at the specified rotation speed not proportionally. It is desirable that the speed change be controlled in such a manner that the two gears are tilted.

In general, a continuously variable transmission that continuously changes the pitch diameter of a pulley is known as a means for controlling the rotational speed of a driving shaft and a driven shaft. A mechanism has been proposed in which the position of a movable conical wheel forming one side of a pulley is controlled using a mechanism.

In this prior art, a fixed cylinder is provided in the axial direction of the movable conical wheel, and the piston rond of this fixed cylinder is brought into contact with the shaft end of the movable conical wheel. A duct is formed at the end of the rond, and this duct is opened and closed by a sleeve via the flyweight-spring arm of the sliding shaft or the rond.

[Problem to be solved by the invention]

However, this structure cannot be applied to the separation control of auxiliary equipment, which requires maintaining a constant pulley ratio even when the load fluctuates, as well as to gear shifting of motorized bicycles. A slider that is arranged behind both pulleys and controls the discharge of hydraulic pressure from a duct bored in the piston is connected by an arm that bypasses both pulleys. Large, dedicated fixed cylinders and pumps are used. As a result, the mechanism becomes complicated, and there are problems such as an increase in size in the axial and radial directions and an increase in weight, and in this respect as well, the mechanism is unsuitable for use as a continuously variable transmission device for automobile auxiliary equipment.

The present invention was created in order to solve the above-mentioned problems, and its purpose is to provide a hydraulically operated V-belt typeless mechanism that can achieve good shifting characteristics with a simple, compact, and lightweight mechanism. An object of the present invention is to provide a step-change transmission.

[Means to solve the problem]

In order to achieve this object, the present invention provides the auxiliary pulley with a drive function, configures the entire interior of the movable pulley of the auxiliary pulley as a pressure chamber, and switches the passage within the pressure chamber using a solenoid valve. The movable pulley is moved by introducing and extracting high-pressure oil.

In other words, the present invention is characterized by a driven function type pulley attached to a quick-acting shaft, a passive function type pulley provided in the housing of the engine block or auxiliary hydraulic pressure supply source, and a joint between the two pulleys. A variable speed belt is attached, and the dynamic function pulley includes a shaft fixed to the engine block or housing, a fixed pulley rotatable around the outer periphery of the shaft, and a fixed pulley that rotates around the outer periphery of the shaft at a position facing the fixed pulley. A rotatable guide holder, a movable pulley whose inner diameter side is guided by a fixed pulley and whose outer diameter side is guided by a guide holder, and which forms a variable capacity hydraulic chamber between it and the guide holder, and whose tip communicates with the hydraulic chamber. The present invention includes a passage bored in the shaft and a switching valve for controlling the flow of high-pressure oil in the passage.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a continuously variable transmission according to the present invention (
FIG. 1 shows the state when the diameter of the auxiliary pulley is at its maximum, and FIG. 2 shows the state when the diameter of the auxiliary pulley is at its minimum.

Reference numeral 1 denotes a heel motion shaft (crankshaft), and a pulley 2 with a driven function is provided at the end of this quick motion shaft 1 protruding from the engine block 100. That is, the fixed pulley 2a
A movable pulley 2b is provided which is pressed toward the fixed pulley by a spring 2c. Reference numeral 3 denotes a quick-acting pulley, which is a feature of the present invention, and is provided in the housing 101 of a pressure fluid supply source (for example, a pump) for an auxiliary machine such as an engine block or a power steering device.

The opening function type pulley 3 includes a shaft 4 fixed to the housing 101 by a flange 4a, a fixed pulley 5 rotatable around the shaft 4, a movable pulley 6 paired with the fixed pulley 5, and a movable pulley 6. A guide holder 8 that guides the pulley 6 and forms a partition is provided, and a speed change belt 7 is stretched with a predetermined tension between both pulleys 5 and 6 and the pulley 2 on the driven function side.

Bearings 9a and 9b are fixed to the front shaft 4 at a predetermined interval, a fixed pulley 5 is fixed to the outer race of one bearing 9a, a guide holder 8 is fixed to the other bearing 9b, and the fixed pulley 5 is fixed to the outer race of the other bearing 9b. The cylindrical portion 5a and the cylindrical portion 8a of the guide holder 8 are each fitted onto the shaft 4 so as to be freely rotatable.

The guide holder 8 is integrally provided with a flange portion 8b extending radially from the root of the cylindrical portion 8a, and the movable pulley 6 is connected to the guide surface 5b provided inside the fixed pulley 5 via a seal ring 24. It has an inner cylindrical part 6a that is in sliding contact and an outer cylindrical part 6b that is in contact with the outer surface of the flange of the guide holder 8 via a sealing material 25, and a variable capacity pressure chamber 1o is between the movable pulley 6 and the guide holder flange part 8b. It is formed.

Furthermore, a cover 11 is arranged behind the guide holder 8, and this cover 11 has a fitting part 1 which rotates together with the outer cylinder part 6b of the movable pulley 6 while being in oil-tight contact with the outer diameter part of the cover 11.
1a on the outer diameter side, and a boss Ilb is formed on the inner diameter side, and an oil seal 26 attached to this makes it come into sliding contact with the shaft 4 or the cylindrical guide 4b fixed thereto. A sub-pressure chamber 10' is formed between 11 and the flange portion 8b.

A main passage hole 12 is bored in the shaft 4 from the rear end, and the upstream side of the main passage hole 12 is connected to a hydraulic pressure supply source (for example, a pump), not shown, via a filter 27.
On the downstream side, there is a boat 120 that opens into the gap between the cylindrical portion 5a of the fixed pulley 5 and the cylindrical portion 8a of the guide holder 8, and this boat 120 communicates with the pressure chamber 1o. Ring seals 28, 28 are attached. Further, a sub-passage hole 13 is bored in the shaft 4 out of phase with the main passage hole 12, and the sub-passage hole 13 has a boat 130 that communicates with at least the low-pressure drain and the sub-pressure chamber 13.

Reference numeral 14 designates an electromagnetically operated switching valve, and in this embodiment, a valve hole 15 is formed in the shaft 4 so as to be perpendicular to the main passage hole 12 and the sub passage hole 13, and a valve is slidably inserted into the valve hole 15. It has a valve body 16 arranged therein, a magnet coil 17 fixed to the outer periphery of the shaft 4, and a casing 18 surrounding the magnet coil 17.

The valve body 16 has a passage 16a that connects the main passage hole 12 divided into left and right parts by the valve hole 15, and a passage 16b that also connects the left and right sub passage holes 13. The size is such that the left and right sub-passage holes 13 can be electrically connected whether they are switched or not switched. An L-shaped bypass passage 16c is formed in the valve body 16, with one end opening into the passage 16b and the other end opening into the valve hole 15 beyond the passage 16a connecting the main passage hole 12. Seal rings 160 and 161 are attached to both sides of the passage 16a connecting the main passage hole 12.

The valve body 16 has an armature portion 16d extending into the magnet coil 17, and the armature portion 16d is in the valve position as shown in FIG. 2), it is biased by a spring 19 disposed in the casing 18, and a snap ring 20 for positioning is attached to the valve hole 15.
is installed.

The magnet coil 17 is connected to the control unit 2
1 driver, and the control unit 21 has sensors 22a and 22b.

Engine speed signals and load signals from 22c and 22d,
An accelerator position signal and an oil/water temperature signal are input, and the magnet coil 17 is turned on and off based on a control signal obtained by arithmetic processing of these signals.

In the map, reference numeral 23 indicates an auxiliary spring for assisting fluid pressure arranged in the pressure chamber, and 29 indicates a torque transmitting means from the guide holder 8 to the movable pulley 6.

3 and 4 show another embodiment (second embodiment) of the present invention. In this embodiment, the basic structure of the fixed pulley 5, movable pulley, guide holder 8, cover 11, etc. is the same as that of the first embodiment, but the main passage hole 12, the sub passage hole 13, and the electromagnetically operated switching valve 14 are the same. The configuration is different from the first embodiment.

That is, in this embodiment, the main passage hole 12 is not in a straight line, but consists of a first passage hole 12a and a second passage hole 12b that are bent near the rear end of the shaft and open to the outer circumference of the shaft, and the sub passage hole 13 A branch passage 13a is formed in parallel to the second passage hole 12b.

The magnetic coil 17 of the magnetically operated switching valve 14 is fixed to the flange 4a of the shaft 4 via the casing 18, and the valve body 16 has a cylindrical shape and is slidably attached to the outer periphery of the shaft 4. It is fitted and biased in the axial direction by a spring 19 placed between the flange 4a and the valve body 16. A flange-shaped armature 16cl that is attracted to the magnet coil 17 is provided on the outer periphery of the valve body 1G.

Two ring groove-shaped passages 16a and 16b are formed on the inner diameter side of the valve body 16 with a partition 16e in between. 2 passage hole 12a,
12b communicates, the passage 16b communicates with the branch passage 13a,
When the valve body 16 moves due to energization of the magnet coil 17, the second passage hole 12b and the branch passage 13a move into the passage 1.
6b.

It goes without saying that the valve body 16 of the electromagnetically operated switching valve 14 may be of a rotating type instead of a linearly moving type. Moreover, contrary to the embodiment, when the magnet coil 17 is energized, the pressure chamber 1
It is also possible to have a relationship in which high pressure oil is sent to 0.

[Effect of the embodiment]

Next, the operation and effect of the embodiment will be explained.

In the first embodiment, when the sliding shaft 1 rotates, the pulley 2 with the driven function rotates, and this rotation is transmitted to the speed change bell 1.
is transmitted to the turbulence function type pulley 3 via the fixed pulley 5.
and the guide holder 8 is a bearing 9a.

The movable pulley 6 rotates around the shaft 4 via the torque transmission means 29, and the movable pulley 6 also rotates synchronously via the torque transmission means 29.

At this time, when the electromagnetically operated switching valve 14 is inactive, that is, when the magnet coil 17 is not energized, the valve body 16 is in the lowered position, and the left and right main passage holes 12 communicate with each other through the passage 16a. Therefore, high pressure oil passes through the boat 120 from the main passage hole 12 and fills the pressure chamber 10, and the auxiliary spring 2
The movable pulley 6 is pressed to the right in cooperation with the pressing force of 3.

On the other hand, the low-pressure hydraulic pressure in the sub-pressure chamber 10' is drained from the boat 130 through the sub-passage hole 13 and the passage 16b.

Therefore, the movable pulley 6 is held on the closed side, the diameter of the auxiliary equipment pulley becomes maximum, and the auxiliary equipment is immediately moved at a speed ratio of, for example, 1:0°5.

In this state, when a signal is sent from the control unit 21 and the magnet coil 17 is energized, the valve body 16 rises as shown in FIG. 2, thereby cutting off the passage 16a from the left and right main passage holes 12. The supply of high pressure oil to the pressure chamber 10 is stopped. At this time, since the lower end opening of the bypass passage 16c communicates with the main passage hole 12, the movable pulley 6 is pressed by the belt tension, and the high pressure oil in the pressure chamber 10 is transferred to the main passage hole 12 and the bypass passage #! Passage 1 via 16 c
6b, whereby the movable pulley 6 moves to the left. On the other hand, since the passage 16b communicates with the auxiliary passage hole 13, the discharged high-pressure oil is sucked through the auxiliary passage hole 13 into the pressure chamber 10' on the back whose volume has been expanded, and this pressure chamber 10'
By filling the water, rapid movement of the movable pulley 6 is prevented, and then the water is drained through the sub passage hole 13. This minimizes the diameter of the auxiliary pulley and controls the gear ratio to, for example, 1:1.

In the second embodiment, when the magnet coil 17 is not energized, the first and second main passage holes 12a.

12b communicates with the passage 16a of the valve body 16, high-pressure oil is supplied to the pressure chamber 10 along the route shown by the arrow, and the movable pulley 6 is kept in a closed state.

When the magnet coil 17 is energized, the valve body 16 slides on the shaft 4 against the spring 19, and the second main passage hole 12b is cut off from the passage 16a and communicates with the passage 16b, thereby preventing the supply of high-pressure oil. is cut off. Then, the high pressure oil in the pressure chamber 1o flows into the sub passage hole 13 via the second main passage hole 12b, the passage 16b, and the branch passage 13a, and the movable pulley 6 is moved to open.

Therefore, according to the present invention, the flow of high-pressure oil to the pressure chamber 1o is switched by energizing or de-energizing the magnet coil 17, the opening degree of the movable pulley 6 is controlled, and the on-vehicle control unit 21 is energized or de-energized. By controlling the timing and number of energizations, it is possible to directly change the gear ratio on the auxiliary equipment side.

〔Effect of the invention〕

According to the present invention described above, since the pulley having the drive side function is provided on the auxiliary equipment side, that is, on the engine block or the housing of the power steering pump, it is possible to directly control the appropriate gear ratio of the auxiliary equipment on the auxiliary equipment side. It is also possible to use low-temperature oil other than engine oil.

Thermal influence on the transmission belt can be reduced, and stable transmission characteristics can be obtained over a long period of time.

Moreover, not only the inside of the movable pulley is used as a pressure chamber, but also
Since there are fewer moving parts such as flyweights and moving trucks, the structure can be simple, compact, and lightweight.

Excellent effects such as good in-vehicle compatibility can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a first embodiment of the continuously variable transmission according to the present invention with the maximum pulley diameter, FIG. 2 is a partial cross-sectional view showing the same with the minimum pulley diameter, and FIG. 3 is a cross-sectional view showing the first embodiment of the continuously variable transmission according to the present invention. the second of
FIG. 4 is a sectional view showing the embodiment with the maximum pulley diameter, and FIG. 4 is a partial sectional view showing the embodiment with the minimum pulley diameter. 1... Drive shaft, 2... Driven function type pulley, 3... Drive function type pulley, 4... Shaft, 5... Fixed pulley,
6... Movable pulley, 7... Speed change belt, 8... Guide holder, 10... Pressure chamber, 12... Main passage hole, 13
...Auxiliary passage hole, 14...Solenoid operated switching valve, 16.
... Valve body. 16a, 16b - Passage Patent Applicant: Diesel Equipment Co., Ltd.

Claims (1)

[Scope of Claims] A driven function type pulley attached to a drive shaft, a drive function type pulley provided in a housing of an engine block or an auxiliary equipment hydraulic pressure supply source, and a speed change belt installed between both pulleys. , the drive function type pulley includes a shaft fixed to an engine block or housing, a fixed pulley rotatable around the outer periphery of the shaft, a guide holder rotatable around the outer periphery of the shaft at a position facing the fixed pulley, and an inner diameter A movable pulley is guided by a fixed pulley on one side and a guide holder on the outer diameter side, and forms a variable capacity hydraulic chamber between the movable pulley and the guide holder, and the shaft is bored so that its tip communicates with the hydraulic chamber. A continuously variable transmission comprising a passage and a switching valve that controls the flow of high-pressure oil in the passage.