JPH0625574B2 - Fixing mechanism for lid for forming oil chamber of continuously variable transmission - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a belt type continuously variable transmission used in vehicles such as automobiles, and more particularly, to a hydraulic device for a movable pulley for changing the effective diameter of the pulley. It is a thing.

[Prior Art] A belt type continuously variable transmission has recently been proposed as a transmission for vehicles such as automobiles. (For example, JP-A-60-3745
No. 5).

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 at the position where 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. .

FIG. 4 shows a sectional view of the upper half of the rotation axis of the output pulley. In FIG. 4, the fixed pulley 500 is a rotary shaft 502.
The movable pulley 504 is integrated with the rotary shaft 502.
By moving up to change the width of the pulley circumferential groove 506, the position where the transmission belt 508 hangs in the pulley circumferential groove 506,
That is, the effective diameter of the pulley is changed.

This movement of the movable pulley 504 is normally performed by the movable pulley 504.
Plate portion 504 of the movable pulley 504 provided behind the
This is performed by supplying or discharging pressure oil to the hydraulic oil chamber 510 having a as a moving wall. The hydraulic pressure of this hydraulic oil chamber 510 increases or decreases according to the rotational speed of the pulley due to the centrifugal force due to the rotation of the pulley. To do. As a result, the effective diameter of the pulley changes, and the tension of the transmission belt 508 increases and decreases repeatedly, which may affect the fatigue life of the transmission belt 508.

Therefore, in order to prevent the movable pulley 504 from moving due to the centrifugal oil pressure, a balance oil chamber 514 is provided at a position via the fixed wall 512 of the hydraulic oil chamber 510, and the centrifugal oil pressure generated in the balance oil chamber 514 causes Hydraulic oil chamber 510
The means for canceling the oil pressure of the
7-171154). That is, the balance oil chamber 514
Is defined by a fixed wall 512 of the hydraulic oil chamber 510 and a lid 516 fixed to the cylindrical portion 504b of the movable pulley 504. The fixed wall 512 separating the hydraulic oil chamber 510 and the balance oil chamber 514 is connected to the fixed wall 512. A passage 518 is provided. The pressure oil supplied to the hydraulic oil chamber 510 is supplied to the communication passage 51.
8 to be supplied to the balance oil chamber 514. With this configuration, the force that pushes the movable pulley 504 by the centrifugal oil pressure of the hydraulic oil chamber 510 is the balance oil chamber 51.
This is offset by the force of pushing the lid 516 of the balance oil chamber 514 by the centrifugal oil pressure of No. 4. The oil in the balance oil chamber 514 is discharged to the drain.

[Problems to be Solved by the Invention] In order to fix the lid 516 to the cylindrical portion 504b of the movable pulley 504, conventionally, a cross section formed between the chamfered portion of the cylindrical portion 504b and the lid is substantially triangular. The O-ring 520 was attached to the annular portion of the above, and the peripheral edge of the lid 516 was caulked in the annular groove 504c of the cylindrical portion 504b of the movable pulley 504.

However, this fixing method has the following problems. First, since the peripheral portion of the lid 516 is crimped, it takes time and effort to crimp, and a dedicated crimping device is required. Further, it takes a lot of time to release the caulking for removing the lid 516, and there is a problem that the lid 516 once the caulking is released cannot be reused.

[Means for Solving Problems] Means adopted by the present invention for solving the above problems include a fixed pulley fixed to a rotary shaft for input or output, and a slidable mount provided on the rotary shaft. And a fixed pulley for holding the transmission belt between the fixed pulley and the fixed pulley, and a movable pulley including a cylindrical portion formed on the flat plate on the side opposite to the fixed pulley, and the fixed pulley of the movable pulley. Is fixed to the rotary shaft on the opposite side, and together with the flat plate portion and the cylindrical portion of the movable pulley, an operating oil chamber forming member that forms an operating oil chamber for moving the movable pulley, and an end of the cylindrical portion of the movable pulley. It has a disc portion extending in the rotation axis direction, and the disc portion, the hydraulic oil chamber forming member, and the cylindrical portion of the movable pulley are provided on the opposite side of the hydraulic oil chamber forming member from the hydraulic oil chamber. To correct the centrifugal oil pressure generated in the hydraulic oil chamber. A balance body for forming a balance oil chamber, and an input or output pulley including: a movable body, the movable pulley is moved by supplying / discharging the hydraulic oil to / from the hydraulic oil chamber, In a continuously variable transmission that changes the effective diameter of the pulley with respect to, a fixing mechanism for fixing the lid body to the cylindrical portion of the movable pulley, which is formed on the movable pulley side of the disk portion of the lid body. A cylindrical portion into which the outer circumference of the cylindrical portion of the movable pulley can be fitted, a rotation locking portion and an annular groove formed on the outer periphery of the cylindrical portion of the movable pulley, a snap ring mounted in the annular groove, A locked portion that is formed on the cylindrical portion of the lid body and that engages with the rotation locking portion to restrict movement of the lid body in the circumferential direction; and a formed on the inner diameter side of the cylindrical portion of the lid body, Engages with the snap ring to regulate axial movement of the lid The gist is a fixing mechanism of an oil chamber forming lid of a continuously variable transmission, which is characterized by including an engaging portion.

[Operation] The rotation locking portion of the movable pulley and the locked portion of the lid block the movement of the lid in the circumferential direction, and the snap ring mounted on the annular groove of the movable pulley causes the inner diameter of the cylindrical portion of the lid. The engagement of the engagement portion formed on the side prevents the lid body from moving in the axial direction.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Before explaining the parts related to the present invention, first, referring to FIG. 3, the structure of the entire continuously variable transmission using the present invention will be described. FIG. 3 is a sectional view of a belt type continuously variable transmission.
This continuously variable transmission is roughly classified into a fluid coupling device 50, a belt type continuously variable transmission 100, a forward / reverse switching planetary gear device 200, and a reduction gear device and a differential gear device (not shown).

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 fluid coupling device 50 is arranged therein.
The main case member 12 and the cover member 14 form a belt type continuously variable transmission chamber 102. Belt type continuously variable transmission 100
Are arranged. As shown in FIG. 3, the forward / reverse switching planetary gear device chamber 202 is formed by the main case member 12 below the main case member 12, and the forward / reverse switching planetary gear device 200 is arranged. Further, as shown in FIG. 3, a differential chamber is formed by the fluid coupling case member 10 below the fluid coupling case member 10, and a reduction gear device and a differential gear device (neither is shown). Are 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 is composed of a pump impeller 56 and a turbine impeller 58. 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 through a fluid (oil), and transmits the rotational power of the engine to the belt type continuously variable transmission 100.

The direct coupling clutch 60 transmits the rotational power of the engine to the rotary shaft 104 of the input pulley 110 as it is by its operation. When the power transmission is performed via the fluid coupling 54, it is fluid transmission, so that the slip occurs and the speed is reduced, but when the direct coupling clutch 60 is used,
It is transmitted as it is without slipping. This direct clutch 6
Zero is provided to improve the so-called fuel consumption rate, and is normally activated during high-speed traveling.

The oil pump 70 is provided at the rear position of the fluid coupling 54 (the left position in FIG. 3).
The oil pump 70 is driven by a rotation transmission member 72 that is integral with the pump impeller 56 and generates hydraulic pressure. The hydraulic pressure is used to control a belt type continuously variable transmission 100, which will be described later, and to control a forward / reverse switching planetary gear device 200.

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 is composed of a fixed pulley 112 and a movable pulley 114.
The fixed pulley 112 is formed integrally with the rotary shaft 104, and a movable pulley 114 is fitted and attached to the rotary shaft 104. Rotating shaft 104 and movable pulley 11
4 is the axial grooves 117 and 118 formed on both sides.
The ball 120 is engaged with and attached to the movable pulley 114, so that the movable pulley 114 is movable in the axial direction with respect to the rotary shaft 104, but is integrated in the rotational 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 112 a and 114 a of the fixed pulley 112 and the movable pulley 114 are formed in a circumferential groove 116 having a V-shaped cross section. The transmission belt 190 is wound around the circumferential groove 116. The width of the circumferential groove 116 is the movable pulley 114.
The effective diameter around which the transmission belt 190 is wound can be changed by the axial movement of the transmission belt 190. The input pulley 110 is shown with different effective diameters above and below its centerline CL. Transmission belt 1 is shown in the upper half
90 shows the minimum effective diameter state, 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. 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 defined by the movable pulley 114 and the first hydraulic oil chamber forming member 136. The second hydraulic oil chamber 134 is defined by the piston 138 and the second hydraulic oil chamber forming member 140. This first hydraulic oil chamber 132
The movable pulley 114 is moved in the axial direction by supplying and discharging the hydraulic pressure to and from 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. In the lower half state, the operating hydraulic pressure is most supplied, and 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. The two hydraulic oil chambers, the first hydraulic oil chamber 132 and the second hydraulic oil chamber 134, are provided in this manner in order to increase the operating area of the hydraulic pressure. Reference numeral 135 is a balance oil chamber for canceling the centrifugal oil pressure of the hydraulic oil chamber.

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 from 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 adapted to be supplied from an oil passage (not shown) formed in the above.

The output pulley 150 is also configured substantially similar to the input pulley 110. That is, the movable pulley 154 includes a fixed pulley 152 and a movable pulley 154, and the movable pulley 154 is fitted and attached to a rotary shaft 180 integrated with the fixed pulley 152. The movable pulley 154 is the input pulley 11
As with the 0 movable pulley 114, the axial groove 15
6, 158 and the ball 160 are attached to the rotating shaft 180 so as to be integral with the rotating shaft 180 but movable in the axial direction. The fixed pulley 152 of the output pulley 150
The arrangement of the movable pulley 154 and the movable pulley 154 is opposite to that of the input pulley 110. This is for linearizing the position of the transmission belt 190 when the widths of the circumferential grooves 116 and 166 of the input pulley 110 and the output pulley 150 are 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
It is supported by 2a and the cover member 14 via bearings 162 and 164. As shown in FIG. 3, the right end of the rotary shaft 180 is detachably formed from the output shaft 310 of the planetary gear unit 200 for forward / reverse switching and the gear unit for reduction, which will be described later, separately from these units. There is.

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.

The output pulley 150 is also configured such that the effective diameter of the position around which the transmission belt 190 is wound can be changed by the movement of the movable pulley 154 in the axial direction. In FIG. 3, the upper half of the output pulley 150 is in the minimum effective diameter state, and the lower half is in 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 is the hydraulic fluid chamber 1
Has 72. The hydraulic oil chamber 172 has a movable pulley 154.
And a 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 in accordance with the change in the effective diameter of 50. 1
A balance oil chamber 73 is provided for the same purpose as the input pulley 110.

Supply of the operating oil pressure to the operating oil chamber 172 is performed through an oil passage 182 provided at the shaft center of the rotary shaft 180.
2 is supplied through an oil passage provided in the partition wall member 12a of the main case member 12.

The transmission belt 190 includes 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 in a beaded fashion to form a transmission belt 190.

Since the belt type continuously variable transmission 100 is configured as described above, the input pulley 1 is provided via the transmission belt 190.
When power is transmitted from 10 to the output pulley 150 and the effective diameter of the input pulley 110 is changed at this time,
The output pulley 150 is steplessly changed in speed and transmitted.

Forward / reverse switching planetary gear device 200 The forward / reverse switching planetary gear device 200 includes a Ravigneaux compound planetary gear device 210 and two braking devices 230, 24.
It consists of 0 and one clutch device 250.

The Ravigneaux compound planetary gear device 210 meshes with a first sun gear 212 and a second sun gear 214, a first planetary gear 216 that meshes with the first sun gear 212, and meshes with the first planetary gear 216 and the second sun gear 214. Second planetary gear 218, ring gear 220 meshing with first planetary gear 216, first planetary gear 216 and second planetary gear 21.
It consists of the elements of a carrier 222 that rotatably supports 8.

Each element of the Ravigneaux compound planetary gear device 210 described above,
The two braking devices 230 and 240 and the one clutch device 250 are connected between the rotary shaft 180 of the output pulley 150 and the output shaft 310 of the reduction gear device 300 as follows.

The first sun gear 212 is connected to the rotary shaft 180 via the clutch device 250, and the second sun gear 214 is directly connected to the rotary shaft 180 by spline fitting. Further, the first sun gear 212 includes a braking device 230 between the first sun gear 212 and the partition member 12a. Similarly, ring gear 2
20 is provided with a brake device 240 between the partition member 12a. Then, the carrier 222 serves as an output member,
It is connected to the output shaft 310 of the reduction gear device 300 by spline fitting.

The planetary gear unit 20 for switching between forward and reverse travel is configured by the above-described connection configuration.
0 is a forward two-stage reverse 1 due to the selective operation of two brake devices 230 and 240 and one clutch device 250.
It is possible to obtain a gear shift stage.

Next, the part relating to the present invention is shown in FIG.
Description will be made based on a detailed sectional view of the upper half of the rotation axis 50. In FIG. 2, the fixed pulley 152, the rotary shaft 18
0, movable pulley 154, circumferential groove 166, transmission belt 19
0, the hydraulic oil chamber 172, the hydraulic oil chamber forming member 174, the balance oil chamber 173, and the balance plate (lid) 175 are the same as the corresponding members in FIG. 4 described in the section of the related art.

In FIG. 2, the portion where the balance plate 175 and the cylindrical portion 154b of the movable pulley 154 are fixed is where the mechanism according to the present invention is used. FIG. 2 shows that the balance plate 175 and the cylindrical portion 154 of the movable pulley 154 have already been shown.
Since it is in a state of being assembled with b, FIG. 1 (A),
The detailed configuration and assembling method of each member will be described with reference to (B) and (C).

FIG. 1A is a perspective view of the balance plate 175. The balance plate 175 is composed of a disk portion 177, a small diameter cylindrical portion 179 and a large diameter cylindrical portion 181 which are two-tiered. The cylindrical portion 181 has an inner protrusion 18 as an engaging portion protruding in the inner diameter direction at each position where the circumference of the edge is divided into three equal parts.
3, 185, 187 are formed. The diameter of the circle defined by these three inner protrusions 183, 185, 187 is the same as the outer diameter of the cylindrical portion 154b of the movable pulley 154. A claw 189 extends in the axial direction on the circumferential edge of one inner protrusion 183. Further, a cutout 191 is formed at a position different from the inner protrusions 183, 185, 187 on the circumferential edge of the cylindrical portion 181.

FIG. 1 (B) shows the snap ring 193.
The outer diameter of the snap ring 193 in the free state is larger than the inner diameter of the cylindrical portion 181 of the balance plate 175. Also, the hooks 193 on both ends of the snap ring 193
The outer diameter of the snap ring 193 when the a and 193b are contracted until they contact each other is smaller than the diameter of the circle defined by the three inner protrusions 183, 185, 187 of the balance plate 175.

FIG. 1C is a sectional view of a portion of the movable pulley 154 centering on the cylindrical portion 154b. The O-ring groove 19 is formed on the outer periphery of the cylindrical portion 154b in order from the side opposite to the flat plate portion 154a.
5 and a snap ring groove 197 are formed in the circumferential direction. The depth of the snap ring groove 197 is larger than the width of the snap ring 193 in the radial direction.
An axial engaging groove 199 is formed further on the flat plate portion 154a side than both the grooves 195 and 197 of the cylindrical portion 154b.
One of the blocks (one of them is shown in FIG.
Only appears. ) Is provided.

Next, the assembling method will be described. First, the O-ring 203 is mounted in the O-ring groove 195 of the cylindrical portion 154b of the movable pulley 154, and the snap ring 193 is fitted in the snap ring groove 197.
Put on. Next, the snap ring 193 is contracted in the snap ring groove 197 so that its outer diameter is equal to or smaller than the outer diameter of the cylindrical portion 154b of the movable pulley 154, and in that state,
The cylindrical portions 179 and 181 of the balance plate 175 are fitted into the cylindrical portion 154b of the movable pulley 154. At this time, the pawl 189 of the balance plate 175 is moved to the movable pulley 1
It is inserted in the locking groove 199 of the cylindrical portion 54 and is aligned in the circumferential direction so that the hooks 193a and 193b of the snap ring 193 are located in the notches 191 of the balance plate 175. Then, when the inner protrusions 183, 185, 187 of the balance plate 175 cross the snap ring 193, the snap ring 193 is expanded.

After assembling in this way, the movement of the balance plate 175 in the circumferential direction is prevented by the claw 189 and the locking groove 199, and the movement in the axial direction is between the inner protrusions 183, 185, 187 and the snap ring groove 197. The balance plate 175 is blocked by the intervening snap ring 193.
And the cylindrical portion 154b of the movable pulley 154 are fixed.
Both are sealed by an O-ring 203.

Conversely, when removing the balance plate 175 from the cylindrical portion 154b of the movable pulley 154, the snap ring 1
The balance plate 175 may be removed while the 93 is contracted by the hooks 193a and 193b.

As described above, according to this embodiment, the balance plate 1
The mounting of the movable pulley 154 of 75 to the cylindrical portion 154b does not require any special device and can be carried out very easily. Further, even when the balance plate 175 is removed, no special device is required and the balance plate 175 can be easily removed. Further, in this mechanism, the balance plate 175
Balance plate 175 to prevent any damage to
Can be used over and over again.

[Effect] By using the mechanism according to the present invention, the cylindrical portion of the movable pulley forming the balance oil chamber of the movable pulley of the continuously variable transmission and the lid body are extremely simple and require a special device. It can be attached and detached without the need. Therefore, the assembly process of the continuously variable transmission is simplified. Moreover, since the lid is not damaged, the same lid can be used repeatedly. Therefore, the maintainability of the continuously variable transmission is improved.

[Brief description of drawings]

FIG. 1 (A) is a perspective view of a balance plate used in the embodiment of the present invention, and FIG. 1 (B) is a perspective view of a snap ring.
FIG. 1 (C) is a sectional view of a portion centering on the cylindrical portion of the movable pulley, and FIG. 2 is a sectional view of an upper half portion of the output pulley of the continuously variable transmission according to the embodiment of the present invention. Figure, third
FIG. 4 is a cross-sectional view of the entire continuously variable transmission, and FIG. 4 is a cross-sectional view of the upper half of the rotary shaft of the output pulley showing the prior art. 100 ... Belt type continuously variable transmission 110 ... Input pulley 150 ... Output pulley 154, 504 ... Movable pulley 175 ... Balance plate 183, 185, 187 ... Inner protrusion 189 ... Claw 193 ... Snap ring 197 ... Snap ring groove 199 ... Locking groove

Claims (1)

[Claims] 1. A fixed pulley (152) fixed to an input or output rotary shaft (180) and a fixed pulley (152) slidably provided on the rotary shaft (180). The flat plate part (154) that holds the transmission belt (190)
a) and a movable pulley (15b) including a cylindrical portion (154b) formed on the side of the flat plate portion (154a) opposite to the fixed pulley (152).
4) is fixed to the rotary shaft (180) on the side opposite to the fixed pulley (152) of the movable pulley (154), and the flat plate portion (154a) and the cylindrical portion (154b) of the movable pulley (154). ) Together with the hydraulic oil chamber forming member (174) that forms the hydraulic oil chamber (172) for moving the movable pulley.
And a disk part (177) extending from the end of the cylindrical part (154b) of the movable pulley (154) in the direction of the rotating shaft (180).
7), the hydraulic oil chamber forming member (174), and the movable pulley (154)
With the cylindrical portion (154b) of the hydraulic fluid chamber forming member (174)
Of the hydraulic oil chamber (172) on the side opposite to the hydraulic oil chamber (172).
Balance oil chamber (17) to correct the centrifugal oil pressure generated in 2)
3) has a lid body (175) and an input or output pulley (150) provided with, and the movable pulley is moved by supplying / discharging hydraulic oil to / from the hydraulic oil chamber (172).
In a continuously variable transmission in which (154) is moved to change the effective diameter of the pulley (150) with respect to the transmission belt (190), the lid body (175) is attached to the cylindrical portion (154) of the movable pulley (154).
A fixing mechanism for fixing to the b), which is formed on the movable pulley (154) side of the disc portion (177) of the lid body (175), and is a cylindrical portion (154b) of the movable pulley (154). A cylindrical portion (179, 181) of the lid body (175) that can be fitted into the outer periphery, and a rotation locking portion (199) and an annular groove (197) formed on the outer periphery of the cylindrical portion (154b) of the movable pulley (154). The snap ring (193) mounted in the annular groove (197) and the cylindrical portion (181) of the lid body (175) are engaged with the rotation locking portion (199) to form the lid. A locked portion (189) that restricts the movement of the body (175) in the circumferential direction and an inner diameter side of the cylindrical portion (181) of the lid body (175) are engaged with the snap ring (193). An engaging portion (183, 185, 187) for restricting the axial movement of the lid body (175), and a fixing mechanism for the oil chamber forming lid body of the continuously variable transmission, comprising: