JPH0712194A - Toroidal type continuously variable transmission - Google Patents

Abstract

PURPOSE:To simplify assembling work by forming bearings to which a countershaft and an idle gear can be assembled independently of a transmission case. CONSTITUTION:The respective bearings 93a, 93b, 94 of a countershaft and an idle gear 17 for transmitting input to toroidal type continuously variable transmission mechanism are integrally provided in the fixedly connected state to the specified positions of a single cover member 92 removable from a transmission case. The countershaft, counter gears 15a, 15b, the idle gear 17 and a shaft part 17a are then assembled in the sub-assembled state to the respective bearings 93a, 93b, 94, outside of the transmission case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toroidal type continuously variable transmission, and more particularly to a counter shaft arranged so that power can be transmitted to a plurality of toroidal type continuously variable transmission mechanisms having input / output disks and rollers. Related to improvement measures of assembly workability.

[0002]

2. Description of the Related Art Generally, a toroidal type continuously variable transmission has a plurality of toroidal type continuously variable transmissions equipped with input / output disks and rollers in the axial direction, as disclosed in, for example, Japanese Patent Application Laid-Open No. 1-193454. Are arranged in parallel to each other, and the input to each toroidal type continuously variable transmission mechanism or the output from each toroidal type continuously variable transmission mechanism is transmitted through the power transmission gear of the counter shaft. The counter shaft is rotatably supported by a bearing provided in a case that covers each toroidal type continuously variable transmission mechanism.

[0003]

By the way, when the counter shaft is assembled, the power transmission gear is attached to each toroidal type continuously variable transmission mechanism while the counter shaft is inserted into the bearing in the case. It will be assembled in synchronism with the assembly of each toroidal type continuously variable transmission mechanism so as to be meshed so that power can be transmitted. In that case, since the bearing is provided in the case, the assembling of the counter shaft together with the toroidal type continuously variable transmission mechanism in the case becomes very troublesome, and the assembling work is difficult.

The present invention has been made in view of the above problems, and an object thereof is to construct a bearing in which a counter shaft can be independently assembled to a transmission case, thereby simplifying the assembly work. Is to try.

[0005]

In order to achieve the above-mentioned object, a means for solving the problems according to the invention of claim 1 is to provide a plurality of toroidal type continuously variable transmissions equipped with input / output disks and rollers in the axial direction. It is premised on a toroidal type continuously variable transmission in which an input to each toroidal type continuously variable transmission mechanism or an output from each toroidal type continuously variable transmission mechanism is transmitted through a power transmission gear of a counter shaft. To do. A bearing that rotatably supports the counter shaft is provided on a cover member that is attachable to and detachable from the case that covers each of the toroidal type continuously variable transmission mechanisms, and the bearing has the counter shaft and the power transmission gear. Is assembled in a sub-assembly state outside the case.

Further, the solution means taken by the invention of claim 2 is such that the bearing of the invention of claim 1 is specified and is integrally provided to the same cover member.

Further, the solution means taken by the invention of claim 3 specifies between each toroidal type continuously variable transmission mechanism of the invention of claim 1 or claim 2 and the power transmission gear of the counter shaft. However, an idle gear that makes the input rotation direction to each toroidal type continuously variable transmission mechanism or the output rotation direction from each toroidal type continuously variable transmission mechanism coincident with the rotation direction of the power transmission gear of the counter shaft is interposed. There is. The bearing for rotatably supporting the idle gear and the bearing for the counter shaft are integrally provided on the same cover member.

[0008]

With the above construction, in the invention according to claim 1,
Since the bearing that supports the counter shaft is provided on the cover member that is detachable from the case that covers the toroidal-type continuously variable transmission mechanism, the counter shaft and the power transmission gear are in the removed state before they are attached to the case. It will be assembled in a sub-assembly state with respect to the bearing of the member. Therefore, when assembling the counter shaft, it is not necessary to assemble the counter shaft in synchronization with the assembling of each toroidal type continuously variable transmission mechanism, and the counter shaft and the power transmission gear can be assembled independently outside the case. it can.

According to the second aspect of the present invention, the bearing for supporting the counter shaft is integrally provided to the same cover member in a coupled state fixed in the axial direction of the counter shaft. Both ends of the counter shaft can be smoothly supported by the bearing without machining errors of the bearing on both ends.

Further, in the invention according to claim 3, the bearing for supporting the idle gear and the bearing for the counter shaft are provided in the same cover member so that the positional relationship between the idle gear and the power transmission gear is maintained. Since it is integrally provided in a fixed and connected state, there is no machining error in the bearing for the idle gear and the counter shaft, and the meshing relationship between the idle gear and the power transmission gear of the counter shaft is ensured smoothly. Will be done.

[0011]

As described above, according to the toroidal type continuously variable transmission of the first aspect of the invention, the counter shaft and the power transmission gear are assembled in the bearing of the cover member removed from the case in a sub-assembled state. Therefore, when the counter shaft is assembled, the counter shaft can be independently assembled outside the case, and the work of assembling the counter shaft and the power transmission gear can be simplified.

Further, according to the toroidal type continuously variable transmission of the second aspect of the invention, the bearing of the counter shaft is integrally provided on the cover member of the wheel at the axially fixed position, and the machining error of each bearing is provided. Since the above problems have been eliminated, both ends of the counter shaft can be smoothly supported.

Further, according to the toroidal type continuously variable transmission of the third aspect of the present invention, the bearings of the idle gear and the counter shaft are integrally provided on the same cover member which maintains their positional relationship, and the respective bearings are integrally provided. Since the machining error and so on are eliminated, the meshing relationship between the idle gear and the power transmission gear of the counter shaft can be ensured smoothly.

[0014]

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

4 and 6 show a transmission equipped with a toroidal type continuously variable transmission according to an embodiment of the present invention. The transmission TM has an engine provided with first to fourth cylinders C1 to C4. A forward / reverse switching mechanism 2 that appropriately switches the power (output) from 1 to a forward output or a reverse output, and a toroidal type continuously variable transmission 3 that shifts the power from the engine 1 are provided. The forward / reverse switching mechanism 2 is connected in series to the toroidal type continuously variable transmission 3, that is, the forward / reverse switching mechanism 2 and the toroidal type continuously variable transmission 3 are connected to the engine output shaft 5 in the transmission case 4 (case). It is arranged on the same axis.

Here, a specific structure of the transmission TM will be described.

First, the forward / reverse switching mechanism 2 will be described. The forward / backward switching mechanism 2 is substantially arranged so that the power transmission of the engine 1 can be transmitted to the input shaft 11, the forward clutch 12, and the reverse clutch. A brake 13, a reverse planetary gear 14, and an input gear 16 that transmits the power of the engine 1 to the toroidal type continuously variable transmission 3 via a counter shaft 15 are provided.

The forward clutch 12 is provided between the input shaft 11 and the input gear 16, and when the clutch is engaged, the engine output through the input shaft 11 is transmitted to the input gear 16 as forward power. There is. Also,
The reverse brake 13 is provided between the transmission case 4 and the ring gear 21 of the reverse planetary gear 14, and stops the rotation of the ring gear 21 at the time of engagement thereof.
The engine output input to the reverse planetary gear 14 via the input shaft 11 is transmitted to the input gear 16 as the reverse power from the sun gear 22 described later. Further, the reverse planetary gear 14 is rotatably supported by the ring gear 21, the sun gear 22 splined to the input shaft 11, the carrier 23 splined to the input gear 16, and the carrier 23. And a pinion gear 24. The counter shaft 15 has counter gears 15a and 15b as power transmission gears at the front and rear ends thereof, and the counter shaft 15 rotates between the counter gear 15a on the front side and the input gear 16. An idle gear 17 is provided to match the direction with the rotation direction of the input gear 16.
The front end of the input shaft 11 is fixed to the rear end of the engine output shaft 5.

Next, the toroidal type continuously variable transmission mechanism 3 will be described. The toroidal type continuously variable transmission 3 has an input shaft 11 (engine output shaft 5) of the forward / reverse switching mechanism 2 as shown in FIG. Against that, it is arranged coaxially behind,
A transmission output shaft 31 as a power transmission shaft extending on the rear side (right side in FIG. 4) in the transmission case 4, and the transmission output shaft 31
First toroidal type continuously variable transmission unit 3 arranged above
2 and a second toroidal-type continuously variable transmission unit 33 disposed on the right side of the first toroidal-type continuously variable transmission unit 32 in FIG.

The first continuously variable transmission unit 32 has an input disk 34 rotatably inserted in the transmission output shaft 31.
4 and an output disc 35 arranged opposite to the left side of the input disc 34 in FIG. 4, the output disc 35 being spline-coupled to the transmission output shaft 31. A power roller 36 is disposed between the disks 34 and 35 so as to straddle and contact the toroidal surfaces 34a and 35a formed by the disks 34 and 35, respectively.

Similarly, the second continuously variable transmission unit 33 is
An input disk 37 similar to the above, and the input disk 37
4 and an output disc 38 arranged on the right side of FIG. 4 and a power roller 39 straddling and contacting the toroidal surfaces 37a, 38a of the both discs 37, 38. The input disk 37 is arranged such that the back surface thereof faces the back surface of the input disk 34 of the first continuously variable transmission unit 32. An intermediate disk 40 is arranged in the space formed between the back surfaces of the pair of input disks 34, 37. The intermediate disc 40 and the input discs 34 and 37 are
A plurality of cam grooves (not shown) are formed on the side surfaces facing each other, and the loading cams 41, ...
Is provided. A power transmission gear 42, which is a helical gear, transmits the power of the engine transmitted from the input gear 16 via the idle gear 17 and the countershaft 15 to the pair of input discs 34, 37 on the outer periphery of the intermediate disc 40. Is integrally formed, and the power from the engine output shaft 5 is transmitted to the power transmission gear 42 by meshing with the counter gear 15b on the rear side. Each of the cam grooves is formed in such a shape that when the intermediate disc 40 and each of the input discs 34 and 37 rotate relative to each other, the pressing force for pushing each of the cams 41 toward the input discs 34 and 37 increases as the relative displacement amount increases. To be done. Therefore, the engine power is transmitted from the intermediate disc 40 to the output discs 35, 38 through the cams 41, ...
1 is transmitted.

Each of the toroidal continuously variable transmission units 32,
Each of the power rollers 36 and 39 of 33 has an eccentric shaft 4 respectively.
Trunnion 45, 45 as a supporting member
It is rotatably attached to. Each trunnion 45
Is a shaft member 46 that is arranged at the lower end of the shaft member 46 so as to extend vertically.
Is fixedly supported by the shaft member 46, and the trunnion 45 is displaced in the vertical direction by displacing the shaft member 46 in the vertical direction.
The gear ratio is configured to be continuously changed. In this case, the upper end portion of each trunnion 45 is spherical by the support member 49 attached to the transmission case 4 by the link post 48 in order to allow the rotation of each trunnion 45 around the axis due to the tilting of the power rollers 36 and 39. The bearing 50 is rotatably supported in the axial direction, and the lower end is rotatably supported by a spherical bearing 54 by a support member 53 attached to a cylinder body 61 of a hydraulic cylinder 59 described later by a link post 52. .

The lower end of the shaft member 46 is rotatably and vertically movably supported by a bearing 58 in the recesses 57 of the upper and lower housings 55 and 56 arranged below the cylinder body 61 shown in FIG. Together with the shaft member 4
A hydraulic cylinder 59 as an actuator for vertically moving the shaft member 46 is connected to a position approximately in the middle of 6. The hydraulic cylinder 59 includes a bolt 6 attached to the transmission case 4.
A cylinder body 61 mounted and fixed at 0; and a piston 62 having a center portion fitted and fixed to a shaft member 46 with an inwardly projecting portion 61a formed on the cylinder body 61 sandwiched vertically. Is equipped with. The cylinder body 61 is integrally provided with bearings 83 and 84 that rotatably support the transmission output shaft 31. The cylinder body 61 is arranged above the valve body 70 described below so as to partition the upper edge of the oil pan 75 into a lid shape. Is formed in a substantially triangular shape when viewed from the front and extends to a position above the transmission output shaft 31 while bypassing the output disks 35 and 38 from the corresponding cylinder body 61, and the transmission output shaft 31 is located at the front side. Bearing 83
The roller bearing 85 is inserted through and supported by the roller bearing 85, while the ball bearing 86 is inserted through and supported by the rear bearing 84. A pair of hydraulic chambers 63 and 64 are formed vertically by the piston 62 and the protrusion 61a of the cylinder body 61, and the shaft member 46 is moved upward in FIG. 5 by supplying hydraulic pressure to the upper hydraulic chamber 63. Conversely, the shaft member 46 is moved downward in FIG. 5 by supplying hydraulic pressure to the lower hydraulic chamber 64.

The upper and lower housings 55, 5
6, a shift control device 65 for limiting the supply of hydraulic oil to the hydraulic chambers 63, 64 of the hydraulic cylinders 59 to shift gears.
Are placed. That is, in the upper housing 55,
Supply oil passage 6 to which oil pressure is supplied from an oil pressure source (not shown)
6 and a first oil passage 67 and a second oil passage 68, which communicate with the hydraulic chambers 63 and 64 of the hydraulic cylinders 59, respectively. A hydraulic control valve 69 is arranged in the lower housing 56. In the valve 69, a hollow body having a central portion of the lower housing 49 formed in the horizontal direction has an outer wall as a valve body 70, and a sleeve 71 slidably disposed in the valve body 70 and the sleeve 71.
And a spool 72 slidably disposed therein. The sleeve 71 has first to third ports 71 corresponding to the supply oil passage 66 and the first and second oil passages 67 and 68.
a to 71c are formed, and the oil in the oil supply passage 66 is transferred from the first port 71a to the first oil passage 67 via the spool 72 and the second port 71b in accordance with the movement of the sleeve 71, or to the spool 72 and the third port 71c. It is configured to communicate with the second oil passage 68 via.

In the vicinity of the left end of FIG. 5 of the sleeve 71,
A pin member 73 is connected to the pin member 73, and a rotary shaft 76a of a stepping motor 76 attached to a vertical wall portion of an oil pan 75 arranged at a lower portion of the transmission case 4 via a driving member 74 arranged in the sleeve 71. The sleeve 71 is connected and slides the sleeve 71 in the left-right direction in FIG. 5 according to the rotation of the motor 76.

Further, at the right end of the spool 72 in FIG.
A feedback mechanism 77 for feeding back the tilting of the power rollers 36, 39 is arranged. The feedback mechanism 77 is used for the trunnion 4 of the second continuously variable transmission unit 33.
5, a recess cam 78 fixedly arranged on the shaft member 46, a first arm 79 whose tip engages with an inclined surface 78a formed on the recess cam 78, and a rotary shaft 80 on which the first arm 79 is rotatably supported. , The spool 7 of the hydraulic control valve 69 rotatably supported by the rotary shaft 80.
The second arm 81 engages with the right end of FIG. 5 in FIG. 5 and the compression coil spring 82 that is compressed between the left side of the spool 72 in FIG. 5 and the pin member 73. By supplying oil to the hydraulic cylinder 59, the shaft member 4
When 6 moves in the vertical direction and the power rollers 36, 39 tilt, the first and second arms 79, 81 of the feedback mechanism 77 rotate clockwise or counterclockwise in response to the vertical movement of the shaft member 46. Then, by moving the spool 72 in the same direction as the sleeve 71, the communication between the supply oil passage 66 and the first or second oil passage 67, 68 communicating with the supply oil passage 66 is cut off, and the tilt position of the power roller 39. Is configured to stop the supply source to the hydraulic cylinder 59 when the target position has reached.

Further, as a characteristic part of the present invention, as shown in FIGS. 1 to 3, a gear shift is provided at an upper position on one side of the transmission case 4 corresponding to the sides of the counter shaft 15 and the idle gear 17. A single detachable cover member 92 fastened by a plurality of bolts 91, ... Is attached to the machine case 4. Bearings 93a, 93b that rotatably support the front and rear ends of the counter shaft 15 are integrally provided at the lower front and rear positions of the cover member 92. The bearing 93a on the front end side of the counter shaft 15 is configured to rotatably support the front end side of the counter shaft 15 via ball bearings 95, 95 at the front and rear positions sandwiching the front counter gear 15a. On the other hand, the rear end side bearing 93b rotatably supports the rear end side of the counter shaft 15 immediately before the rear side counter gear 15b via a roller bearing 96. Further, a bearing 94 that rotatably supports the idle gear 17 is integrally provided at a position on the upper front side of the cover member 92.
Is configured to rotatably support a shaft portion 17a of the idle gear 17 via ball bearings 97, 97 at front and rear positions sandwiching the idle gear 17. Of the bearings 93a, 93b, 94, the bearings 93a, 93b at the front and rear end portions of the counter shaft 15 are located at the upper and lower front positions of the cover member 92.
5 is integrally provided in a fixed state in the axial direction of the counter shaft 5, while the bearing 83a at the front end of the counter shaft 15 is provided.
And the bearing 94 of the idle gear 17 is integrally provided in a fixed and fixed state with respect to the front upper and lower positions of the cover member 92 so as to maintain the positional relationship between the front counter gear 15a and the idle gear 17. The bearings 93, 93
The counter shaft 15 and the counter gears 15a and 15b, and the shaft portion 17a and the idle gear 17 are assembled to the b and 94 in a sub-assembly state outside the transmission case 4.

Therefore, in the above embodiment, the bearings 93a, 93b for supporting the counter shaft 15 and the bearing 94 for supporting the shaft portion 17a of the idle gear 17 are provided.
Is integrally provided at a predetermined position of a single cover member 92 that is detachable with respect to the transmission case 4 that covers the toroidal type continuously variable transmission mechanisms 32 and 33. Therefore, the counter shaft 15, the counter gear 15a, 15b, idle gear 1
7 and the shaft portion 17a are the bearings 93a, 93a of the cover member 92 in a detached state before being attached to the transmission case 4.
The sub-assemblies 93b and 94 are assembled together. Therefore, when the counter shaft 15 and the idle gear 17 are assembled, it is not necessary to assemble the counter shaft and the shaft portion of the idle gear in synchronization with the assembly of each toroidal type continuously variable transmission mechanism. 15a, 15b, the idle gear 17, and the shaft portion 17a are separately assembled outside the transmission case 4, and the assembling work can be simplified.

Further, since the bearings 93a and 93b for supporting both ends of the counter shaft 15 are integrally provided to the cover member 92 in a fixed state in the axial direction of the counter shaft 15, the counters are provided. It is possible to smoothly support both ends of the counter shaft 15 with respect to the bearings 93a, 93b without causing machining errors of the bearings 93a, 93b with respect to both ends of the shaft 15.

Further, the bearings 93a, 93b, 94 of the counter shaft 15 and the idle gear 17 are arranged with respect to predetermined positions of the cover member 92 so that the positional relationship between the counter gear 15a on the front side and the idle gear 17 is maintained. Since they are integrally provided in a fixed and connected state, machining errors of the bearing 94 with respect to the shaft portion 17a of the idle gear 17 do not occur, and the meshing relationship between the idle gear 17 and the counter gear 15a on the front side is smooth. Can be secured.

Moreover, since the counter shaft 15 and the idle gear 17 are arranged at one side upper side position in the transmission case 4, the oil in the oil pan 75 provided for the lubricated portion in the transmission case 4 is increased. To counter gear 15
The immersion of a, 15b and the idle gear 17 is prevented,
It is possible to suppress resistance when the counter shaft 15 and the idle gear 17 rotate.

The present invention is not limited to the above embodiment, but includes various other modifications.
For example, in the above embodiment, the toroidal type continuously variable transmission mechanism 3 is used.
Although the input to 2, 33 is transmitted through the counter gear 15b of the counter shaft 15, the output from the toroidal type continuously variable transmission is transmitted through the counter gear of the counter shaft. Of course, it may be a gear transmission.

Further, in the above embodiment, the bearings 93a, 93b of the counter shaft 15 and the idle gear 17,
Although the 94 is integrally provided in a fixed state at a predetermined position of the single cover member 92 in a connected state, it is also possible to individually and integrally provide a plurality of separable cover members for each bearing. Also, only the bearings before and after the counter shaft are integrally provided to the same cover member in a connected state, or one bearing of the counter shaft and the bearing of the idle gear are connected to the same cover member in a connected state. It may be provided integrally.

Further, in the above embodiment, the output of the engine output shaft 5 is output from the forward / reverse switching mechanism 2 to the transmission output shaft 31 via the toroidal type continuously variable transmission mechanism 3. Output from the torque converter to the transmission output shaft via the forward / reverse switching mechanism, and from the switching clutch to the transmission output shaft via the toroidal type continuously variable transmission mechanism. It may be a transmission that can be appropriately switched to two transmission units.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a cover member in a sub-assembled state of a counter shaft and an idle gear, which are cut along an axis.

FIG. 2 is a vertical sectional front view of a toroidal type continuously variable transmission cut near a front counter gear.

FIG. 3 is a vertical sectional front view of a toroidal type continuously variable transmission cut near a rear counter gear.

FIG. 4 is a vertical sectional side view of the toroidal type continuously variable transmission.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a skeleton diagram schematically showing the transmission including the starting device.

[Explanation of symbols]

 3 Toroidal type continuously variable transmission 4 Transmission case (case) 15 Counter shaft 15a, 15b Counter gear (gear for power transmission) 17 Idle gear 32, 33 Toroidal type continuously variable transmission 92 Cover member 93a, 93b Counter shaft bearing 94 Idle gear bearings

Claims (3)

[Claims] 1. A plurality of toroidal type continuously variable transmission mechanisms equipped with input / output disks and rollers are arranged in parallel in the axial direction, and input to each toroidal type continuously variable transmission mechanism or from each toroidal type continuously variable transmission mechanism. In a toroidal type continuously variable transmission in which an output is transmitted through a power transmission gear of a counter shaft, a bearing that rotatably supports the counter shaft is provided in a case that covers the toroidal type continuously variable transmission mechanism. On the other hand, it is provided on a detachable cover member, and its bearing is
A toroidal type continuously variable transmission characterized in that the counter shaft and the power transmission gear are assembled in a sub-assembly state outside the case. 2. The toroidal type continuously variable transmission according to claim 1, wherein the bearings are integrally provided on the same cover member. 3. An input rotation direction to each toroidal type continuously variable transmission mechanism or an output rotation from each toroidal type continuously variable transmission mechanism between each toroidal type continuously variable transmission mechanism and the power transmission gear of the counter shaft. And a counter shaft bearing that rotatably supports the idle gear and a counter shaft bearing the same cover member. The toroidal type continuously variable transmission according to claim 1 or 2, wherein the toroidal type continuously variable transmission is provided integrally.