JPS59133860A - Traction roller step-less transmission controlled in hydraulic pressure manner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuously variable traction roller transmission in which torque is transmitted via a torque transmitting power roller that is pivotally supported within a housing and engaged with a trochle-like output disk.

Such a transmission (in this case, the power roller (a power roller) is rotatably mounted on a pivot structure so as to cause the combined inner diameter of the power roller and the troicle-like output disk to change depending on the desired speed change ratio. This power roller pivot structure is also mounted so that it can be moved in the vertical direction to initiate a change in the gear ratio. This may be achieved by a flexible tensile sheet such as that shown in US Pat. No. 4,086,820, published May 2, 1978.

However, the force applied to the power roller and the tension sheet through the power roller pivot groove is considerable, and therefore requires a strong pivot structure and a continuous pivot bearing for it. . Also, transmissions are not necessarily vibration-free, and these vibrations are transmitted to the power roller, the support structure and its bearings, and ultimately to the transmission housing.

In order to support the power roller and the roller pivot groove in a simple, inexpensive manner and essentially immovably, a power roller is connected between the opposing troital-like input and output tasks. A power roller continuously variable transmission with self-tapping rollers (a V-shape is formed in the housing sink and has a center of curvature that coincides with the axis of each pivot structure.
- Partially cylindrical support space? The power roller pivot assembly includes a pressurized fluid receiving cavity formed adjacent to the same wall and facing the power roller. Pressurized fluid supplied to the support cavity directly supports the power roller pivot assembly. Since the pivot structure is evenly supported and colored, it is not subjected to bending stress, and since it floats on the pressurized fluid, the pivot groove body is able to transmit large torque through the transmission, and the movement of the no-roller and toroidal discs When a large contact force is applied to the l!l!12 area, C( can also be easily rotated.

The traction roller transmission as shown in FIG. 1 also comprises a housing 10 that supports coaxial input and output shafts 12 and 14 rotatably supported in bearings 16 and 14.

The input and output shafts 12 and 14 are fitted with toroidal input/output takes 20 and 22 arranged opposite each other such that a toroidal cavity 24 having a circular axial cross section is defined therebetween. be. Troutal nitrogen $12
Four internally recessed power rollers 26, 28 are rotatably supported and are in engagement δ with the troital input/output desks 203d and 22.

Troutal input/output takes 20 and 22 (top screw 3
East 1112 and 14 by 0! Mounted on top]t
It is seated on the flange 32 and J4. Axial support is provided to manpower stations 20t6 and 22 by axial thrust bearing assemblies 3G and 38fC. Each axial thrust tt++I+ bearing, the groove body consists of a hydrostatic bearing consisting of an area within the confined sealing link 40 placed in the annular sealing link cavity 42 for axial sliding dJ capacity and insufficiently pressurized. A mechanical axial thrust bearing 44 is included to provide VC minimal bearing support to avoid VC loss during start-up operations in which fluid is supplied to the hydrostatic axial thrust bearing. Mechanical bearings 44 are arranged so as to always provide a minimum degree of coupling between troital input/output takes 20 and 22 and power rollers 26 and 28 (with a disc spring 4 rF2 ft behind it).
B is connected to an axially movable bearing ring 4b.

Power rollers 26 and 28 are input and output #711
For adjusting various power transmission ratios between the input shaft 1-2 and the output shaft 14 by rotating the power roller around an axis perpendicular to the plane containing the state j line of 1, The power rollers 2G and 28 are rotatably supported on a pivot structure 50 which allows the power rollers 2G and 28 to engage the toroidal input/output disks 20 and 22 in circles having different disc diameters.

For support of the pivot assembly 50, the housing 10 has a semi-cylindrical cavity 52 within which extends a hydrostatic trunnion support assembly 54.

The trunnion support structure 54 has a wall 56 surrounding a trunnion support cavity 58 adapted to be pressurized by a hydraulic fluid V to support the pivot structure 50. These cavity walls 56 define a Howsink cavity: 52/1
What is the sealing strip 60 supported adjacent to the semi-circular wall of the housing 100?Behind the sealing strip 60 is a sealing strip 60 that facilitates sealing (engagement) between the sealing strip 60 and the wall of the housing cavity 52. A large number of springs 62 are arranged so as to give (.C) a large number of springs 62.

The power roller 26 is supported on the pivot assembly 50 by a shaft 64 that projects from the pivot assembly 50 into a center hole 66 of the roller 26 . l of the radial support of the power roller 26
A roller bearing 68 is provided therein. When in operation,
The roller 26 is axially supported by a hydrostatic bearing formed by a bearing cavity 10 surrounded by a sealing ring 12.
A support roller bearing 14 is provided to support the power roller when the power roller is supplied with zero power, for example during start-up.

The support bearing 14 is axially movably supported by a disc spring 76 to keep the power roller 26 in constant engagement with the toroidal input/output disks 20 and 22.

The pivot assembly 50 is pivoted within the housing 10 as best shown in FIG. Both axial ends of the pivot structure 50 (at .'C) are circular cavities 78 that rotatably receive trunnion support members 82 and 84 that are axially supported by axial thrust bearings 86 and 1118. and 80, the axes of the cavities 78 and 80 being essentially tangential to the toroidal input/output disk (C) and semi-cylindrical housing. The center line of the cavity 520 curvature and Natsu-C Piroro.

The trunnion support members 82 and 84 also protrude toward each other, with the center of the contact opening between the surface of the power roller 2δ and the toroidal input/output disks 20 and 22 being essentially 8'Il.
An integrated control arranged along a line '11
1. What do pistons 90 and 92 do? The no-roller pivot assembly 50 is formed with cylindrical cavities 96 and 98 for receiving control pistons 90 and 92, respectively. In order to move the support body 50 in the axial direction V and to move the power roller 26 relative to the toroidal input/output disk G at the same time, the cylinder 9 is moved in order to start changing the gear ratio.
means 100 for supplying pressurized fluid to 6 and 98;
102 is provided.

As shown in FIG.
Engage the power roller 26 by pressurized fluid supplied to the seal ring cavity 106 through a hole 110 providing communication between the OG and the cylinder 96.

A cylinder 9Ili is exposed to a higher pressure grinding fluid in the bore 1us-+; Valves 112 and 114 are provided, respectively.

Pressure lubricant supplied to trunnion support structure/l1il 58 (directly from power roller 26 & pressure lubricant for supplying pressurized lubricant to trunnion support cavity 58 to provide static pressure support) The passage 104 is the control piston 9
0 and extends through the center of pivot assembly 50 at trunnion support cavity 58 and -C. From passage 104 to cylinder 9G
To avoid leakage of the 1121 i'1↑ agent,
The west passage 104 extends into the piston 90 -\ and is slidably sealed therein by a lightning seal link 118.
Contains 6.

The shaft 64 of the power roller 26 is provided with a Jq1 direction passage t'z 120 for supplying pressurized lubricant to the roller hole 66'16 and the bearing 68. and the pressure of the lubricant supplied to the trunnion support cavity 58 (i.e., the power roller support inside the sealing ring 72 to force the power roller 26 into direct and firm engagement with the troital input/output disks 20 and 22). A passageway 122 extends through the pivot assembly 50 for supplying pressurized fluid to the cavity 70.

When the input shaft 12 rotates in one direction, the output shaft 12 rotates in the opposite direction at a relative speed corresponding to the pivot position of the power roller pivot structure 50. Power rollers 26 and 28
For a firm engagement with the troital input/output tasks 20 and 22, the trunnion support cavity 58 behind the power rollers 26 and 28 (and the power roller pivot structure 50vc; 4. does not impose any qualitative bending loads). Changing the gear ratio by 1° while pressurized as shown in FIG.
It starts by rotating the seven-pronged power roller pivot groove body 50 to change the gear ratio. . [The axial movement and rotation of the no-roller pivot structure 50 are
- the roller and its pivoting structure 50 are located in the tofnion support cavity 58;
This is easily carried out because it is floatingly supported by the moisture/smoothing agent inside. Axial movement of the pivot assembly 50 is obtained by applying pressurized fluid to one of the sills 96.98, then draining and capping the other.

The lubricating and supporting fluid absorbs the forces necessary to support the power roller 2ti and the pivot assembly 50 and keep them in engagement with the troital input/output disk 20.22.
- C. is supplied to the trunnion support cavity 158 through the passageway 104 at a constant pressure. The force required to bring the power roller into engagement with the troital input/output task depends on the torque to be delivered, and therefore the fluid pressure imparting the contact force is dependent on the torque being transmitted. It is also controlled.

The transmitted torque is transmitted through the power rollers 26 and 28 and generates an axial trunnion force that must be balanced by the differential control fluid pressure within the control cylinders 96 and 98. Therefore, the control series 96 and 9
The pressure difference between
and the troital input/output tasks 20, 22 are the direct measure of the force required for the sink.

If it is controlled so that the low temperature and pressure are kept constant, or to a certain extent depending on the gear ratio, that is, the pivot position of the trunnion, then, for example, the gear ratio controller arrangement can be 54262, the high pressure is self-regulating in response to the transmitted torque. The high pressure in that case is a measure of the force required to engage the power roller with the barrel. Higher than this! The fi control fluid pressure increases in either one of the syringes 96 and 98 depending on the direction in which the torque is transmitted, ie, the direction of rotation in which the torque is reached. In any case, in the arrangement described above, the higher control fluid pressure is maintained while the inverted d-valve 11+ or 112 is closed to maintain the higher control fluid pressure within the Jiufeng ring cavity 1υ6. Added to the ring cavity 106 through the hole 108 or hole 110
Ru. Therefore, the sealing link 12 increases in thickness when the torque to be transmitted increases, thereby reducing the leakage of the limited sealing link 72 from the large power roller support cavity 7υ.
The force that causes the accumulation of pressure within the second trunnion support cavity 58 and within the power roller support cavity 70 is also exerted on the power roller 26 (strong).

The controls for the syringes 96 and 98 are schematically shown in FIG. 3.

The trunnion support member 82 has a control center 124 connected to the power roller pivot groove 50 so as to move integrally with the giant pivot structure 50 in the axial direction. The shaft 124 carries a cam structure 126.2, and the cam (groove body 124 has a groove on its surface 128), as described in detail in the above-mentioned! a four-way control valve 13 adapted to control the supply and discharge of fluid therefrom;
The minimum power roller engagement force depends on the minimum control fluid pressure. Also, the minimum power roller engagement force is dependent on the minimum control fluid pressure. The power roller remains at the pivot position T4.Therefore, the minimum pressure is the pressure relief path 1 from the control valve 134.
Circumferential cam 140 disposed within 38 and on cam assembly 126
The pivot position actuated by A is controlled by a one year old sensing regulator valve 136.

The pivot position sensitive control valve 136 may also comprise a cylinder 142 having a piston 144 movably disposed therein;
The piston 144 abuts a cam follower actuated by a cam 140; b is biased by a spring 146. Piston 144 is ftjlJ i wholesale fluid pressure is power roller 2
The control fluid is discharged only when f is sufficient to resist the force of the spring 146 and open the control valve 136, depending on the pivot position of 6.
3. Allow discharge into the passageway 150. - Preferably, the discharge line 150 is provided with a restriction 152 to avoid rapid pressure changes that could lead to cavitation.

A bypass 154 is also preferably provided between the rf4? It includes an orifice 160 that allows only a relatively small flow, substantially less than the flow possible through restriction 152.

Pressurized fluid is supplied to the semi-circular trunnion support cavity 58 through a supply conduit 162 with a flow restriction orifice 164, which is controlled by the fluid supply and sealing ring 72 of the power roller 26. It is possible to control the body pressure of the centrifugal support structure and the power roller support '01 according to the transmitted torque.

With this device, precise speed control can be achieved,
Unnecessary loading of the traction surface is also avoided. Pressurized lubricant is supplied to all hydrostatic bearings by a single pump.

However, the supply lines to the various bearings preferably include orifices to ensure proper distribution of pressurized lubricant to the various hydrostatic bearings.

However, the invention is not limited to the device as described above and shown in the drawings. For example, a single trunnion assembly could be provided with a control piston arranged in the pivot of the trunnion. Although such a device is simpler than the device shown, a slight bending (J) occurs which causes a precessing movement of the trunnion.

However, with a relatively low torque transmission Vcλ1, it is very easy to accommodate such forces.

It is noted here that in a device such as that shown in FIG. The axes of cylinders 96 and 98 are aligned with bearings 86 and 8 in order to change the appropriate load.
8 ((preferably thick enough to penetrate a more enclosed space).

Additionally, the trunnion support cavity 58 formed between the power roller pivot assembly 50 and the housing 10 may be circular with a curved sealing ring 60 abutting the semi-cylindrical wall of the housing 100, or it may be straight. The first sealing strip is arranged in four directions in the direction of the axis of the pivot structure 50, and the partially circular 20th strip is arranged perpendicularly to the first sealing strip εC, and the cross section is rectangular. The temperature is also good. Finally, the trunnion support cavity! 58 may be separated by a separating wall 166, and the sealing strip 168 may double-tally J/ within the separating wall 166 (.

[Brief explanation of the drawing]

Fig. 1 is an axial sectional view of the traction roller transmission, Fig. 2 is a sectional view taken along line B-n in Fig. 1, and Fig. 31 shows the pressurized fluid supply to the traction roller transmission. j
This figure does not show the control system for the control. [Explanation of the symbols for the +9 part] 10.. House sink 1 2.. Human power proposal 14. Output shaft 20.22. Troutal shaped input/output disk 24 Troutal shaped cavity 26.28. Power roller 36.38. Axial thrust bearing Structure 50・PaC no roller pivot support structure 58・・Trunion support cavity 70・Power roller support cavity 72・・Sealing ring 82, 84・Trunion support” temple t′+++ J:, J
86, 88 Axial thrust bearing 90.92... Control piston 9ti, 9B Cylinder 1130.102... Pressurized fluid supply means 104... Passage 112.114... Check valve 120... Axial passage 122 ... Passage 126 Cam structure 134 ... Four-way tli control valve 136 ... Pivot position sensing control extension valve 142 ... Cylinder 144 Piston

Claims (1)

[Claims] ■ A housing, coaxial input and output shafts rotatably supported within the housing, and one supported by the input shaft and the other by the output shaft; Two toroidal disks with turned toroidal cavities defining a toroidal cavity of circular IV surface and said toroidal disks 17J vclit each having a toroidal cavity disposed between them for the transmission of torque therebetween. at least two torque transmitting pawls engaged with a troital-shaped input/output disk, rotatably supporting the power roller and changing the torque transmission ratio between the input and output troital disks; Air
a pivot assembly pivoted within the housing sink, the housing having a partially cylindrical wall adjacent to the valley of the pivot assembly forming a cavity; has a center of curvature substantially coincident with a pivot axis of said pivot assembly, said pivot assembly having a trunnion support cavity formed adjacent to said cylindrical wall portion of said housing, and further having a trunnion support cavity formed adjacent to said cylindrical wall portion. 2. A continuously variable traction roller transmission comprising means for supplying pressurized fluid to the trunnion support cavity to provide support for the pivoting structure above the trunnion support cavity. The pivot structure defines the support cavity and carries a sealing strip that is shaped to abut an adjacent housing wall and is biased into engagement with the housing wall. 3. According to claim 1, the pivot structure includes an axial piston and cylinder structure arranged at both ends thereof, and the pivot structure supports the axial piston and cylinder structure in the axial direction. A traction roller transmission comprising means for selectively supplying pressurized fluid to the piston and cylinder groove in order to move the piston and the cylinder groove to initiate a change in the transmission ratio. In addition, a trunnion support member is arranged within the housing adjacent to the axial end of the pivot assembly and is rotatably supported about a pivot axis that is essentially tangential to a central circle of the toroidal cavity. The stone and cylinder structure indicated by hσ has a contact circle between the power roller and the troital input/output disk so as to minimize the reaction force that generates a precess motion on the pivot structure when torque is transmitted. A traction roller transmission in which a center line passing through a plane defined by 6. The trunnion support member of claim 5, wherein the trunnion support member comprises: The pivot assembly has the piston extending into a cylinder formed in the pivot assembly so as to be axially movably supported by the piston, and the pressurized fluid supply means passes through the trunnion support member. A traction roller transmission comprising a passageway for receiving pressure fluid therefrom.7 Claim 1.16. The valley power loaf also communicates with the trunnion support cavity to define a hydrostatic cavity for receiving pressure fluid therefrom. Traction roller transmission including a hydrostatic power roller support cavity. 8 In claim 6, each power roller includes a hydrostatic power roller support cavity comprising a hydrostatic bearing sealing link axially movably disposed within an annular sealing ring cavity; 271+'J is a traction roller transmission communicating with at least one of the cylinders of the piston and cylinder assembly. 9. According to claim 8, a communication passage is provided between the sealing ring cavity and a cylinder formed in the power roller pivot structure, and in the communication passage there is provided a communication passage from the cylinder carrying a higher pressure fluid. A check valve is arranged to supply pressurized fluid to the sealed link cavity to control fluid pressure in the trunnion support cavity and in the hydrostatic power roller support cavity in response to the pressure of the higher pressure fluid. Traction roller transmission, which also has. 10 ・Claim 1 provides that the trunnion support cavity is divided into a plurality of support cavities by a traction roller. A fluid source is provided and a control valve is provided in the pivot assembly to selectively supply fluid to the cylinder to rotate the power roller pivot assembly to a desired ratio pivot position. 1. A traction roller transmission, wherein means are provided associated with at least one of the structures for controlling the pressure of fluid discharged from said cylinder in dependence on the pivot position of said transmission. 12. According to claim 11, the means for controlling the discharge pressure of the control fluid pivots the spring force of a spring-loaded control valve associated with the pivot structure. A traction roller transmission which is a spring biased pressure control valve having biasing means adapted to be set in response to the pivot position of the structure. 1:3 The traction roller transmission according to claim 12, wherein the biasing means is a cam follower that abuts against a cam structure that is rotatably mounted on the direction pivot support structure.