JPH0612281Y2 - Lubrication device for continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to lubrication of a belt type continuously variable transmission used in a vehicle such as an automobile.

[Prior Art] A belt-type continuously variable transmission has recently been proposed as a transmission for vehicles such as automobiles (for example, Japanese Patent Application No. 59-108).
216).

The input pulley and output pulley of the belt type continuously variable transmission are
A movable pulley is fitted and attached to a rotary shaft that is integral with the fixed pulley so as to be movable in the axial direction, and is formed so that the effective diameter of the position around which the transmission belt is wound changes. By rotating the transmission belt between the input pulley and the output pulley thus formed and changing the effective diameters of the input pulley and the output pulley, the rotation of the input pulley is transmitted to the output pulley in a stepless manner. .

The rotary shafts of the input and output pulleys are supported by bearings mounted on the case. Then, as means for lubricating the bearing, pressure oil from an oil pump is introduced.

Further, as another lubrication means, there is also one that guides oil scattered by agitation along with rotational driving of the belt type continuously variable transmission to the bearing.

[Problems to be Solved by the Invention] However, in the former lubricating oil supply means, since the consumption flow rate of the lubricating oil is large, it is necessary to set the discharge capacity of the oil pump to a large value. Therefore, there are problems that the oil pump is increased in size, cost is increased, and loss torque is increased.

Also, with the latter method, the amount of oil scattered and the amount of lubricating oil may change depending on the oil temperature and the number of rotations of the belt, and the lubricating oil may not be able to be sufficiently supplied to the bearing. There was a problem that it also became.

[Means for Solving the Problems] The present invention made to solve the above problems is such that each shaft is rotatably supported by a continuously variable transmission main body through a bearing and is provided along the shaft. An input pulley and an output pulley each having a movable movable pulley and a fixed pulley fixed to the shaft, and a movable pulley and a fixed pulley that are sandwiched between the input pulley and the output pulley. A continuously variable transmission having an input transmission pulley and a movable pulley of the output pulley, wherein the rotational force is continuously changed and transmitted from the input pulley to the output pulley. A cylindrical portion integrally provided on the opposite side of the movable pulley from the holding side of the transmission belt, and at the other end side of the cylindrical portion, in a state of protruding toward the shaft side, integrally with the cylindrical portion. A moving wall provided on the movable pulley, and a working oil chamber forming member integrally provided on the shaft on the side of the movable pulley on which the cylindrical portion is installed and having a tip slidably attached to an inner peripheral surface of the cylindrical portion. An operating oil chamber that is formed by the movable pulley, the shaft, the cylindrical portion, and the operating oil chamber forming member, and that stores operating oil supplied from a predetermined supply oil passage, the cylindrical portion, the moving wall, and the A centrifugal hydraulic chamber that is formed by a hydraulic oil chamber forming member, has a gap between the moving wall and the hydraulic oil chamber forming member, and is supplied with hydraulic oil, and stores the hydraulic oil; A continuously variable transmission, characterized in that a part of the continuously variable transmission is provided at a position corresponding to the hydraulic oil overflowing from the centrifugal hydraulic chamber, and the part is provided with a passage for guiding the hydraulic oil to a predetermined required position. The main point is the lubrication system.

[Operation] According to the present invention, the back of the movable pulley, that is, the movable pulley,
The hydraulic oil is supplied from a predetermined oil supply passage to the hydraulic oil chamber formed by the shaft, the cylindrical portion and the hydraulic oil chamber forming member.
The hydraulic pressure in the hydraulic oil chamber is affected by the centrifugal force generated by the rotation of the pulley. Therefore, if the hydraulic oil exists only in the hydraulic oil chamber, the hydraulic pressure exceeding the desired pressure acts on the movable pulley according to the centrifugal force, and moves the movable pulley toward the fixed pulley more than necessary. The problem of occurs. Therefore, a moving wall is provided in a cylindrical portion extending to the opposite side of the hydraulic oil chamber forming member, and the centrifugal hydraulic chamber is formed by the cylindrical portion, the moving wall and the hydraulic oil chamber forming member. Hydraulic oil is also supplied from the surroundings to this centrifugal hydraulic chamber. Therefore, the hydraulic pressure of the centrifugal hydraulic chamber is also affected by the centrifugal force according to the rotation speed of the pulley.

However, the hydraulic pressure in the hydraulic oil chamber tries to move the movable pulley toward the fixed pulley, and the hydraulic pressure in the centrifugal hydraulic chamber acts on the moving wall to move the movable pulley in the direction opposite to the fixed pulley via the cylindrical portion. I try to move it. Therefore, even if the hydraulic pressure in the hydraulic oil chamber fluctuates due to the centrifugal force, the hydraulic pressure in the centrifugal hydraulic chamber cancels out, and the problem of moving the movable pulley toward the fixed pulley more than necessary does not occur.

In order to maintain such an offset state in a stable manner, the hydraulic oil must always be sufficiently present in both the hydraulic oil chamber and the centrifugal hydraulic chamber. Therefore, hydraulic oil is supplied to the hydraulic oil chamber from a predetermined supply oil passage, hydraulic oil is supplied to the centrifugal hydraulic chamber from the surroundings, and excess hydraulic oil is discharged. That is, in the centrifugal hydraulic chamber, since there is a gap between the moving wall and the hydraulic oil chamber forming member, the hydraulic oil supplied from the surroundings to the centrifugal hydraulic chamber overflows from the gap. Originally, this overflowed hydraulic oil is the hydraulic oil that is constantly supplied in order to stably maintain the above-mentioned offset state.
Therefore, a stable and sufficient amount overflows. This overflowing hydraulic oil is received by a part of the passage and guided to a predetermined required location.

As a result, it is possible to supply a sufficient amount of hydraulic oil to a required place without providing a special pump.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the transmission of this embodiment includes a fluid coupling device 50, a belt type continuously variable transmission 100, a forward / reverse switching planetary gear device, a reduction gear device, not shown, and a differential gear. It consists of a device.

Each of these devices is mounted in a case member of the transmission. The case member is a fluid coupling case member 1
0, a main case member 12, and a cover member 14.

A chamber for accommodating each device is formed by each of these case members. A fluid coupling device chamber 52 is formed by the fluid coupling case member 10, and a frood coupling device 50 is arranged therein.
A belt type continuously variable transmission chamber 102 is formed by the main case member 12 and the cover member 14, and the belt type continuously variable transmission 100 is provided.
Are arranged. A forward / reverse switching planetary gear unit chamber is formed by the main case member 12 below the main case member 12, and the forward / reverse switching planetary gear unit chamber is arranged. Furthermore, the fluid coupling case member 10
The fluid coupling case member 10 at a position below
The diff chamber is formed by the
A differential gear device is arranged.

Next, each device will be described.

Fluid Coupling Device 50 The fluid coupling device 50 includes a fluid coupling 54 and a direct coupling clutch 60. The fluid coupling 54 includes a pump impeller 56 and a turbine impeller 5.
8, the pump impeller 56 is connected to an engine crankshaft (not shown), and the turbine impeller 5
Reference numeral 8 is connected to a rotary shaft 104 of an input pulley 110 which serves as an input shaft of the belt type continuously variable transmission 100. As is well known, the fluid coupling 54 transmits power via a fluid, and transmits the rotational power of the engine to the belt type continuously variable transmission 100.

The oil pump 70 is provided at the rear position of the fluid coupling 54. The oil pump 70 is driven by a rotation transmission member 72 integrated with the pump impeller 56,
Generates hydraulic pressure. The hydraulic pressure is a belt type continuously variable transmission 1 described later.
00 and control of the forward / reverse switching planetary gear device.

Belt-type continuously variable transmission 100 The belt-type continuously variable transmission 100 includes an input pulley 110 and an output pulley 150. The input pulley 110 includes a fixed pulley 112 and a movable pulley 114. The fixed pulley 112 is formed integrally with the rotating shaft 104, and the movable pulley 114 is fitted and attached to the rotating shaft 104. Rotating shaft 104 and movable pulley 1
14 denotes axial grooves 117 and 11 formed on both sides.
A ball 120 is engaged with and attached to the movable member 8 so that the movable pulley 114 can move in the axial direction with respect to the rotating shaft 104, but is integral in the rotating direction.

The rotary shaft 104 of the input pulley 110 is rotatably supported by the partition member 12a of the main case member 12 and the cover member 14 on both sides via bearings 122 and 124.

Opposing pulley surfaces 112a and 114a of the fixed pulley 112 and the movable pulley 114 are formed in a circumferential groove 116 having a V-shaped cross section. A transmission belt 190 is wound around the circumferential groove 116. The width of the circumferential groove 116 is the movable pulley 1.
The effective diameter around which the transmission belt 190 is wound can be changed by changing the axial movement of 14.
The input pulley 110 is shown with different effective diameters above and below its centerline CL. The illustrated state of the upper half shows the minimum effective diameter state of the transmission belt 190, and the illustrated state of the lower half shows the maximum effective diameter state.

The movable pulley 114 is axially moved by a hydraulic cylinder device 130 on the back surface. The hydraulic cylinder device 130 has a first hydraulic oil chamber 132 and a second hydraulic oil chamber 134. The first hydraulic oil chamber 132 is formed by being partitioned by the movable pulley 114 and the first hydraulic oil chamber forming member 136. The second hydraulic oil chamber 134 is formed by being partitioned by the piston 138 and the second hydraulic oil chamber forming member 140. The movable pulley 114 is moved in the axial direction by supplying and discharging hydraulic pressure to the first hydraulic oil chamber 132 and the second hydraulic oil chamber 134. In the upper half state of the hydraulic cylinder device 130, the operating hydraulic pressure is discharged, and the input pulley 110 is in the minimum effective diameter state. The state of the lower half is the state where the operating hydraulic pressure is most supplied,
The input pulley 110 is in the maximum effective diameter state.

The working oil pressure is supplied from the first working oil chamber 132 to the second working oil chamber 134 via the communication hole 142. Then, the first hydraulic oil chamber 132 and the second hydraulic oil chamber 1
34 are adapted to operate simultaneously. In addition, as described above, the first hydraulic oil chamber 132 and the second hydraulic oil chamber 134 are
The two hydraulic oil chambers are provided in order to increase the operating area of the hydraulic pressure.

The first hydraulic oil chamber 132 of the hydraulic cylinder device 130
The hydraulic oil pressure is supplied to the second hydraulic oil chamber 134 through the oil passage 108 formed in the rotary shaft 104. Further, the partition wall member 12a of the main case member 12 is connected to the oil passage 108.
It is supplied from the oil passage formed in the.

The output pulley 150 is also configured substantially the same as the input pulley 110. That is, the fixed pulley 152 and the movable pulley 154 are provided, and the movable pulley 154 is fitted and attached to the rotary shaft 180 integrated with the fixed pulley 152. The movable pulley 154 is similar to the movable pulley 114 of the input pulley 110 in that it has the axial grooves 156, 158.
By the ball 160, it is attached to the rotating shaft 180 so as to be integral with the rotating shaft 180 but movable in the axial direction. The arrangement of the fixed pulley 152 and the movable pulley 154 of the output pulley 150 is left-right reversed from that of the input pulley 110. This is input pulley 110 and output pulley 1
This is to make the position state of the transmission belt 190 linear when the width of each circumferential groove 116, 166 of 50 is changed.

The rotary shaft 180 of the output pulley 150 is also the input pulley 110.
In the same manner as in the above case, the partition member 1 of the main case member 12 on both sides
2a and the bearing member 162, 164 on the cover member 14.
Is supported through.

Further, the opposing pulley surfaces 152a and 154a of the fixed pulley 152 and the movable pulley 154 have circumferential grooves 166 having a V-shaped cross section.
The peripheral groove 166 of the output pulley 150.
The transmission belt 190 is wound around the circumferential groove 116 of the input pulley 110.

Also in the output pulley 150, the effective diameter of the position around which the transmission belt 190 is wound can be changed by the axial movement of the movable pulley 154. Where output pulley 1
The illustrated state of the upper half of 50 indicates the minimum effective diameter state, and the illustrated state of the lower half indicates the maximum effective diameter state.

A hydraulic cylinder device 170 is provided on the back of the movable pulley 154. The hydraulic cylinder device 170 has a hydraulic oil chamber 172. The hydraulic oil chamber 172 is the movable pulley 15
4 and the hydraulic fluid chamber forming member 174. Although the hydraulic pressure is supplied to the hydraulic oil chamber 172, the effective diameter of the output pulley 150 is forcibly changed due to the change in the effective diameter of the input pulley 110.
The working oil pressure in the working oil chamber 172 is supplied and discharged according to the change in the effective diameter of 50.

The transmission belt 190 is composed of an endless carrier 192 and a power transmission block 194. Endless carrier 19
2 is formed by laminating a plurality of thin metal hoops. A pair of endless carriers 192 thus formed
In addition, a plurality of power transmission blocks 194 are arranged adjacent to each other to form a transmission belt 190.

As described above, since the belt type continuously variable transmission 100 is configured, power is transmitted from the input pulley 110 to the output pulley 150 via the transmission belt 190, and at this time, the input pulley 150 is continuously variable. It is transmitted by shifting to.

Next, a characteristic configuration of the embodiment of the present invention will be described.

In FIG. 1, the movable pulley 154 of the output pulley 150 is shown.
The cylindrical part 154b is extended behind. A working oil chamber 172 is formed by being surrounded by the cylindrical portion 154b, the back surface of the movable pulley 154, and the working oil chamber forming member 174 fixed to the rotating shaft 180 of the fixed pulley 152.
A spring 179 for returning is provided in the hydraulic oil chamber 172 to urge the movable pulley 154 with a spring force. Also,
A centrifugal hydraulic chamber 173 is provided to the hydraulic oil chamber 172 via a hydraulic oil chamber forming member 174. The centrifugal hydraulic chamber 173 includes a moving wall 154c fixed to an end of the movable pulley 154 and a hydraulic oil chamber. And the orifice 17 provided in the hydraulic fluid chamber forming member 174.
4a communicates with the hydraulic oil chamber 172, and is drained through an annular gap 174d formed on the inner peripheral side of the moving wall 154c.

A high speed oil receiver 501 and a low speed oil receiver 503 are attached to the case 14 (FIG. 2) on the sides and below the gap 174d of the centrifugal hydraulic chamber 173 (see FIG. 3). The high-speed oil receiver 501 is provided in the centrifugal hydraulic chamber 17
It is installed so as to receive the pressure oil drained from the gap 174d of No. 3 and is provided so as to supply the received oil as lubricating oil to the bearing 162 on the output pulley 150 side through the communication pipe 502. , Low speed oil pan 5
03 is a fixed pulley 152 from the high speed oil receiver 501.
Is installed on the lower side, so that the drained oil can be received from the gap 174d of the centrifugal hydraulic chamber 173 following the movement of the movable pulley 154 to the fixed pulley 152 side. Then, the oil received here is passed through the communication pipe 504 to the bearing 1 on the input pulley 110 side.
It is provided so as to supply lubricating oil to 22.

In the above-described configuration, the hydraulic oil pressure is constantly supplied to the hydraulic oil chamber 172. However, the width of the circumferential groove 166 does not change at this hydraulic pressure, and the width of the circumferential groove 166 does not change until the effective diameter of the input pulley 110 changes. It fluctuates and the effective diameter of the output pulley 150 is forcibly changed. The amount of hydraulic oil stored in the hydraulic oil chamber 172 also changes according to the change in the effective diameter of the output pulley 150.

Supply of hydraulic oil into the hydraulic oil chamber 172 is always performed from the oil pump 70 through the oil passage 182. In this case, the hydraulic pressure supplied from the oil passage 182 is set to a pressure that does not hinder the change of the effective diameter on the input pulley 110 side.

Further, the hydraulic oil is discharged through the orifice 17 of the hydraulic oil chamber 172.
4a to the centrifugal hydraulic chamber 173 side. Alternatively, the hydraulic oil chamber forming member 174 may be supplied to the centrifugal hydraulic chamber 173 side by leakage from a portion in sliding contact with the cylindrical portion 154b. It is sometimes done by doing.

The hydraulic oil in the hydraulic oil chamber 172 receives a centrifugal force to strengthen the pressure on the movable pulley 154 and press the movable pulley 154 against the fixed pulley 152, that is, the fixed pulley 152.
However, as described above, the hydraulic oil also flows into and is stored in the centrifugal hydraulic chamber 173 side. The hydraulic oil in the centrifugal hydraulic chamber 173 moves in the direction in which the centrifugal force increases the pressure on the moving wall 154c and reduces the force pressing the movable pulley 154 against the fixed pulley 152, that is, the direction opposite to the fixed pulley 152. Creates an acting force. Therefore, the acting force generated by the centrifugal force is canceled out, and the shake of the movable pulley 154 in the axial direction (the direction along the axis) due to the rotation can be prevented.

In this way, the hydraulic oil that constantly flows into the hydraulic oil chamber 172 and then also into the centrifugal hydraulic chamber 173 will eventually overflow from the gap 174d of the centrifugal hydraulic chamber 173. It is stable and sufficient as described in.

When the effective diameter of the output pulley 150 increases, that is, when the movable pulley 154 moves toward the fixed pulley 152,
Alternatively, when the effective diameter of the output pulley 150 decreases, that is, when the movable pulley 154 moves to the side opposite to the fixed pulley 152, the amount that flows from the hydraulic oil chamber 172 to the centrifugal hydraulic chamber 173 surely changes. However, the volume changes of the hydraulic oil chamber 172 and the centrifugal hydraulic chamber 173 are always opposite, and the total volume of the hydraulic oil chamber 172 and the centrifugal hydraulic chamber 173 is almost constant, so that the oil is supplied from the oil passage 182 as a whole. The minute portion almost always overflows from the gap 174d. That is, a substantially constant amount of oil stabilizes and the gap 174
It will overflow from d.

Thus, the operating oil overflowing from the gap 174d forms a part of the communicating pipe 502 at a high speed, that is, when the width of the circumferential groove 166 is large, that is, when the effective diameter of the output pulley 150 is small. Communication pipe 502 received by 501
Through the bearing 162 on the output pulley 150 side, and at the low speed, that is, when the width of the circumferential groove 166 is small, that is, when the effective diameter of the output pulley 150 is large,
The oil is received by a low speed oil receiver 503 forming a part of the communication pipe 504 and guided to the bearing 122 on the input pulley 110 side through the communication pipe 504. Moreover, a stable and sufficient amount of hydraulic oil is always introduced as lubricating oil.

Therefore, the bearings 122 and 162 are lubricated in a stable amount by the oil drained from the centrifugal hydraulic chamber 173, not by the lubricating oil that is scattered by the stirring as described in the conventional art. Regardless of the number of rotations of the input / output pulley, the oil pump 70 is sufficiently lubricated, and since the pressure oil from the oil pump 70 is not used, the load on the oil pump 70 does not increase.

In the above embodiment, the high-speed and low-speed oil receivers are provided on the output pulley 150 side, but the present invention is not limited to this, and similar effects can be obtained by providing them on the input pulley side.

[Effects of the Invention] As described above, according to the present invention, the drain oil of the centrifugal hydraulic chamber that cancels the centrifugal force of the operating hydraulic chamber that operates the movable pulley is received by the oil receiver and guided to the bearing or the like. It is possible to supply a sufficient and stable amount of lubricating oil.

Moreover, since pressure oil from a hydraulic source such as an oil pump driven by the engine is not used, the oil pump is not burdened.

[Brief description of drawings]

FIG. 1 is a sectional view showing the periphery of an output pulley of a belt type continuously variable transmission according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a belt type continuously variable transmission with an auxiliary transmission of the same embodiment. FIG. 3 is an explanatory view showing the arrangement of the oil receiver of the embodiment. 12 ... Main case member 100 ... Belt type continuously variable transmission 110 ... Input pulley 150 ... Output pulley 112, 152 ... Fixed pulley 122, 162 ... Bearing 114, 154 ... Movable pulley 116, 166 ... Circumferential groove 136, 140, 174 ... Hydraulic fluid chamber forming member 154b ... Cylindrical portion, 154c ... Moving wall 164 ... Roller bearing 170 ... Hydraulic cylinder device 172 ... Hydraulic fluid chamber, 173 ... Centrifugal hydraulic chamber 174d ... Gap 180 ... Rotating shaft, 190 ... Transmission belt 501 ... High speed Oil receiver, 503 ... Low speed oil receiver

Claims (1)

[Scope of utility model registration request] 1. An input pulley in which each shaft is rotatably supported by a continuously variable transmission main body via a bearing, and has a movable pulley movable along the shaft and a fixed pulley fixed to the shaft, By having the output pulley and the transmission belt that is stretched between the movable pulley and the fixed pulley between the input pulley and the output pulley, the rotational force is continuously changed. In a continuously variable transmission transmitted from the input pulley to the output pulley, the movable pulley of the input pulley or the output pulley is integrally provided on one end side opposite to the transmission belt holding side of the movable pulley. A cylindrical wall and a moving wall integrally provided on the cylindrical portion at the other end side of the cylindrical portion and protruding toward the shaft side; An operating oil chamber forming member that is integrally provided and has a tip end slidably attached to the inner peripheral surface of the cylindrical portion, and is formed by the movable pulley, the shaft, the cylindrical portion, and the operating oil chamber forming member. A hydraulic oil chamber that stores hydraulic oil supplied from a predetermined supply oil passage, and the cylindrical portion, the moving wall, and the hydraulic oil chamber forming member, and the moving wall and the hydraulic oil chamber forming member. A part is provided at a position corresponding to the hydraulic oil chamber having a gap between them and supplied with the hydraulic oil and storing the hydraulic oil, and the hydraulic oil overflowing from the centrifugal hydraulic chamber through the gap. A lubricating device for a continuously variable transmission, comprising: a passage for receiving the hydraulic oil and guiding it to a predetermined required location.