JPH09303523A - Continuously variable transmission of infinite gear ratio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts and improve the positional accuracy, sound absorbing function and durability of bearings by keeping the bearing support parts of all constitutional bearings of a continuously variable transmission output gear train faced to an input shaft, and providing two bearing support members secured to the easing of an infinite gear type continuously variable transmission. SOLUTION: The thickness of a shim inserted in a gap between the bearing support part of a bearing support member 118 and bearings 115b and 116b, and an axial gap between bearings 114a and 114b, and an output disc 22 and an output gear 2a, is taken at suitable value, and an axial gap between respective bearings and bearing support parts is thereby held in an optimum state. Also, the bearings to support all the constituent gears 2a, 40a and 4a of a continuously variable transmission output gear train 40 are provided with bearing support parts. These support parts are held on two bearing support members 117 and 118 faced to an input shaft and secured to a casing 113. According to this construction, the number of parts can be reduced and the positional accuracy of the bearings can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission employed in vehicles and the like, and more particularly to a continuously variable transmission having an infinite transmission ratio.

[0002]

2. Description of the Related Art Conventionally, belt type or toroidal type continuously variable transmissions have been known as transmissions for vehicles and the like, and in order to further expand the transmission range of such continuously variable transmissions, continuously variable transmissions are known. There is known an infinitely variable transmission continuously variable transmission as shown in, for example, Japanese Patent Application No. 8-15440, in which a gear ratio can be controlled to infinity by combining with a planetary gear mechanism.

As shown in FIG. 6, this is a unit input shaft 1 of an infinitely variable transmission continuously variable transmission coupled to an engine.
In addition, a continuously variable transmission 2 capable of continuously changing a gear ratio and a speed reducer having a constant gear ratio (hereinafter referred to as a constant transmission) 3
a, 3b are connected in parallel and their output shafts are connected by a planetary gear mechanism. The output of the continuously variable transmission 2 is the continuously variable transmission output gear 2a and the counter gear 40.
A counter gear train (hereinafter referred to as a continuously variable transmission output gear train) 40 composed of a and a gear 4a is connected to the output shaft 4, and the output shaft 4 is connected to the sun gear 5a of the planetary gear mechanism 5. The output shaft 3c of the constant transmission 3 is connected to the carrier 5b of the planetary gear mechanism 5, while the ring gear 5c of the planetary gear mechanism 5 is connected to the unit output shaft 6.

A power circulation mode clutch 9 is provided in the transmission path from the unit input shaft 1 to the carrier 5b of the planetary gear mechanism 5, and the output shaft 4 of the continuously variable transmission 2 is connected to the unit. A direct coupling mode clutch 10 is interposed in the transmission path of the output shaft 6.

In the continuously variable transmission having an infinite transmission ratio constructed as described above, while the power circulation mode clutch 9 is connected,
By disconnecting the direct coupling mode clutch 10, the unit total reduction ratio is controlled substantially continuously including infinity from a negative value to a positive value in accordance with the gear ratio of the continuously variable transmission 2 and the constant transmission 3. In the "power circulation mode", the power circulation mode clutch 9 is disengaged while the direct coupling mode clutch 10 is connected to change the gear ratio of the continuously variable transmission 2 and the continuously variable transmission output gear train 40.
The "direct connection mode", in which the gear ratio corresponds to the product of the gear ratios of
Can be selectively used.

The continuously variable transmission 2 is of a toroidal type in which the power roller 20 is pressed by two sets of an input disk 21 and an output disk 22.

The pinion gears constituting the sun gear 5a, the ring gear 5c and the carrier 5b of the planetary gear mechanism are helical gears in order to improve strength and sound and vibration performance. And the axial load acting on the carrier 5b is applied to a thrust bearing (not shown).

Further, the constituent gears 2a, 40a, 4a of the continuously variable output gear train 40 are rotatably supported by bearings (not shown), and each bearing is supported by an individual support member (not shown). The support member is fixed to a continuously variable transmission case (not shown) with an infinite transmission ratio.

[0009]

However, in the conventional continuously variable transmission having an infinite transmission ratio constructed as described above, the gears 2a, 40 constituting the continuously variable transmission output gear train 40 are provided.
Since the bearings that support a and 4a are supported by individual support members and each of these individual support members is fixed to the infinitely variable transmission case, the number of parts is very large. However, there is a problem in that the workability of assembling is poor, and the positional accuracy of the bearing is likely to be low, and as a result, the sound vibration performance and durability of the gear supported by these are deteriorated.

The present invention was devised in view of the above circumstances, and an object thereof is to support a bearing that axially supports all the constituent gears of an output gear train of a continuously variable transmission with a bearing support member. By doing so, it is possible to reduce the number of parts, improve the workability of assembly, and improve the position accuracy of the bearings, and also improve the sound vibration performance and durability of the gears supported by these. Another object of the present invention is to provide an infinitely variable transmission continuously variable transmission that can simplify the structure by reducing the thrust bearing that applies an axial load that acts on the sun gear as the torque is transmitted.

[0011]

In order to achieve the above object, the present invention provides a continuously variable transmission having an infinite transmission ratio.
A continuously variable transmission and a constant transmission that are respectively connected to the unit input shaft, a sun gear that is connected to the output shaft of the continuously variable transmission, and a carrier and a unit output shaft that are connected to the output shaft of the constant transmission. A planetary gear mechanism including a ring gear, a power circulation mode clutch interposed in the transmission path from the unit input shaft to the carrier, and a transmission path from the output shaft of the continuously variable transmission to the unit output shaft. A direct coupling mode clutch interposed on the way, a continuously variable transmission output gear coaxial with the input shaft of the continuously variable transmission, a first gear arranged coaxially with a sun gear of the planetary gear mechanism, and the unit. Of the continuously variable transmission output gear train and the continuously variable transmission output gear train, which is axially supported in parallel with the input shaft and includes an output gear of the continuously variable transmission and a counter gear that meshes with the first gear. all Two bearings are provided that support bearings that axially support the constituent gears, and the bearing support portions are opposed to each other in the input shaft direction and are fixed to the case of the infinitely variable transmission continuously variable transmission. And a support member.

According to the present invention, the sun gear of the planetary gear mechanism is a helical gear, and the axial load in at least one direction of the sun gear due to torque transmission is determined by the first gear.
It is also possible to load the above gear on the bearing that supports the gear.

[0013]

Therefore, in the continuously variable transmission with an infinite transmission ratio according to the present invention, bearing supporting portions that support bearings that support all the constituent gears of the output gear train of the continuously variable transmission are provided, and Since the bearing support portion of is configured to include two bearing support members that face each other in the input shaft direction and are fixed to the case of the continuously variable transmission with an infinite transmission ratio, the bearing support member The number of parts can be reduced and the positional accuracy of the bearing can be improved.

Further, according to the present invention, at least one axial load acting on the sun gear due to the torque transmission is applied to the bearing that axially supports the first gear of the continuously variable transmission output gear train. Therefore, the thrust bearing that applies the axial load acting on the sun gear can be eliminated, and the structure can be simplified.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

FIG. 1 shows a schematic structure of an infinitely variable transmission continuously variable transmission according to a first embodiment of the present invention.
In addition, in the present embodiment, the same configuration as the conventional one is
The same reference numerals used in FIG. 6 are given, and detailed description thereof is omitted here.

The output gear 2a, the counter gear 40a, and the gear 4a, which form the continuously variable transmission output gear train 40, respectively include two bearings 114a and 114b and bearings 115a and 115, respectively.
b and the bearings 116a, 116b, and these bearings 114a, 114b, 115a, 11 are supported.
5b, 116a, 116b are two bearing support members 11
7, 118, and the bearing support member 1
17 and 118 are fixed to the case 113 of the continuously variable transmission with an infinite transmission ratio at the position of the case member 113a. still,
Bearings other than the above bearings are omitted for the sake of clarity.

Further, the direct coupling mode clutch 110 employs a connecting structure for coupling the continuously variable transmission output shaft 4 and the unit output shaft 6 without interfering with the bearing supporting members 117 and 118.

FIG. 2 is a view of the bearing support member 118 as seen in the direction of arrow A, and FIG. 3 is a view of the bearing support members 117, 1.
2 is a cross-sectional view taken along line X-O ₁ -O ₂ -O ₃ -X of FIG. 2, and FIG. 4 shows an output gear train 40 of the continuously variable transmission and parts around it. -O ₁ -O ₂ -O ₃ -
It is sectional drawing cut | disconnected and shown along X.

As is apparent from FIG. 2, the bearing support member 118 has a plurality of bolt holes 118h for fixing to the case at the position of the case member 113a, the shaft portion of the output gear 2a and the counter gear 40a. Holes 118a, 118b, 118c for the shaft portion and the continuously variable transmission output shaft 4 are provided.

Further, as shown in FIG. 3, the bearing supporting members 117 and 118 are respectively provided with the continuously variable output gear train 4
The bearing support portions 117d, 117e, 117f and 118d, 118e, 118f for supporting the bearings that support all the component gears 2a, 40a, 4a of 0 are provided.
Bolt holes 117h are also formed in the bearing support member 117 at positions facing the bolt holes 118h of the bearing support member 118.

Further, as shown in FIG. 4, the bearing support portions 118e and 118f of the bearing support member 118 and the bearing 115 are provided.
shims 115c, 11 are provided in the axial gaps with b, 116b.
6c is inserted, and shims 114c, 114d are inserted in the axial gaps between the bearings 114a, 114b and the output disk 22 and the output gear 2a.

The spline portion 4 is provided on the output shaft 4 of the continuously variable transmission.
On the other hand, the sun gear 5a of the planetary gear mechanism is also provided with a spline portion 5as.
The output shaft 4 of the continuously variable transmission is connected to the sun gear 5a by fitting s and 5as.

The sun gear 5a is composed of a helical gear, and the axial load to the left side in FIG. 4 due to torque transmission is a thrust bearing provided between the bearing support member 117 and the sun gear 5a. A bearing (not shown) provided on the right side of the sun gear 5a applies an axial load to the right side in FIG.

The bearing support members 117 and 118 are fixed to the case member 113a by a plurality of bolts 120.

Next, the operation of the infinitely variable transmission continuously variable transmission configured as described above will be described.

The bearing support portion 11 of the bearing support member 118.
The axial positions of the counter gear 40a and the gear 4a and the bearings 115a, 115b are set by making the shims 115c, 116c inserted into the axial gaps between the bearings 8a, 118f and the bearings 115b, 116b have an appropriate thickness. , 11
6a, 116b and the bearing support member 118 can maintain an optimum axial gap, and the bearing 114
a, 114b and the output disk 22 and the output gear 2a, the shims 114c, 114d inserted in the axial gaps have appropriate thicknesses, so that the output disk 22
And the axial position of the output gear 2a and the bearings 114a, 114
The axial gap between b and the bearing support portion is maintained in an optimum state, and the bearing support portion 1 is provided for the bearing that axially supports all the constituent gears 2a, 40a, 4a of the continuously variable transmission output gear train 40.
17d, 117e, 117f, 118d, 118e, 1
18f are provided, and these bearing support parts 117d,
117e, 117f, 118d, 118e, 118f
Is two bearing support members 117, which face each other in the input shaft direction.
The bearing support members 117 and 11 are supported by 118.
Since 8 is fixed to the case 13, the number of parts can be reduced, assembly workability can be improved, and the position accuracy of the bearing can be improved, and the sound vibration performance and durability of the gear supported by these can be improved. It is possible to improve the sex.

FIG. 5 is a continuously variable output gear train 24 of an infinitely variable transmission continuously variable transmission according to a second embodiment of the present invention.
It is sectional drawing of 0 and its surrounding components, and is a figure corresponding to FIG. 4 used in the said 1st example of an embodiment.

Regarding the schematic construction of the infinitely variable transmission continuously variable transmission according to the second embodiment, the same components as those of the first embodiment are designated by the same reference numerals as used in the first embodiment, Detailed description is omitted here.

That is, the continuously variable transmission output shaft 204 according to this embodiment includes a gear 204a, a spline portion 204s, a screw portion 204t, and a step portion 204u.

On the other hand, the sun gear 205a of the planetary gear mechanism is provided with a spline portion 205as and an end portion 205au which comes into contact with the step portion 204u.

Continuously variable transmission output shaft 204 and the sun gear 2
05a is connected in the circumferential direction (rotational direction) by fitting the spline portion 205as, and is also connected by a fixing member 221 having a screw portion 221t so as not to move in the axial direction.

Next, the operation of the infinitely variable transmission continuously variable transmission configured as described above will be described.

Similar to the first embodiment, the bearings 117d, 117e, 117f, 117f, 117f, 117f, 117f, and 117f are attached to the bearings that support all the constituent gears 2a, 40a, 204a of the continuously variable transmission output gear train 40.
118d, 118e, 118f are provided, and the bearing support portions 117d, 117e, 117f, 118d, 11 of each other are provided.
8e and 118f are supported by two bearing supporting members 117 and 118 facing each other in the input shaft direction, and these bearing supporting members 117 and 118 are fixed to the case 13, so that the number of parts can be reduced and the assembling can be performed. The workability is improved, the positional accuracy of the bearing can be improved, and the sound and vibration performance and durability of the gear supported by these can be improved.

Further, the axial load to the left and right in the drawing acting on the sun gear 5a, which is a helical gear, with torque transmission is applied to the gear 20 via the step portion 204u and the screw portion 204t.
The bearings 116a and 116b that support the shaft 4a are loaded.

Therefore, since the thrust bearing which applies the axial load acting on the sun gear 5a can be eliminated, the structure can be simplified.

By omitting the fixing member 221, only the axial load in the left direction in the figure acting on the sun gear 5a due to the torque transmission is applied to the bearing 116a or 116.
It is also possible to adopt a configuration in which the load is applied to b.

[0038]

As described above, according to the invention described in claim 1, there is provided a bearing support portion for supporting a bearing that pivotally supports all the constituent gears of the continuously variable transmission output gear train, Since the bearing support part of is equipped with two bearing support members which face each other in the input shaft direction and are fixed to the case of a continuously variable transmission with an infinite transmission ratio, the number of parts can be reduced and the assembling can be performed. Since the workability is improved and the position accuracy of the bearing can be increased, it is possible to obtain the effect that the sound vibration performance and durability of the gear supported by these can be improved.

According to the second aspect of the present invention, there is provided a bearing support portion for supporting the bearings that pivotally support all the constituent gears of the continuously variable transmission output gear train, and the bearing support portions of each other are the input shafts. And two bearing support members that are fixed to the case of the continuously variable transmission with an infinite transmission ratio and that face at least one axial direction load of the sun gear due to torque transmission. Since the bearings that support the shafts are configured to be loaded, the number of parts can be reduced, assembly workability can be improved, and the position accuracy of the bearings can be improved. Since the performance and durability can be improved, and the thrust bearing that applies the axial load acting on the sun gear can be eliminated, the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a skeleton diagram showing the structure of an infinitely variable transmission continuously variable transmission according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of the configuration of one bearing support member of the continuously variable transmission having an infinite transmission ratio as viewed from the direction A.

FIG. 3 is a cross-sectional view showing a state in which a bearing support member of the infinitely variable transmission continuously variable transmission is cut along the line X-O ₁ -O ₂ -O ₃ -X in FIG. 2;

Figure CVT output gear train and parts around it of FIG. 4 the IVT 2X-O ₁ -O ₂ -O ₃
It is sectional drawing which shows the state cut | disconnected along the -X line.

FIG. 5 is a view showing an output gear train of a continuously variable transmission of an infinitely variable transmission according to a second embodiment of the present invention and parts around the output gear train, and FIG. 2X-O ₁ -O ₂ -O ₃ -X. It is sectional drawing which shows the state cut | disconnected along the line.

FIG. 6 is a skeleton diagram showing a schematic configuration of a conventional infinitely variable transmission continuously variable transmission.

[Explanation of symbols]

 1 unit input shaft 2 continuously variable transmission 2a continuously variable transmission output gear 3 constant transmission (decelerator) 4 continuously variable transmission output shaft 4a gear 4s spline part 5 planetary gear mechanism 5a sun gear 5as spline part 5b carrier 5c ring gear 9 Power circulation mode clutch 10 Direct connection mode clutch 40 Continuously variable transmission output gear train (counter gear train) 40a Counter gear 113 Gear ratio infinitely variable continuously variable transmission case 113a Case member 114a, 114b, 115a, 115b, 116a, 116b Bearing 117, 118 Bearing support member 117d, 117e, 117f, 118d, 118e, 118f Bearing support 119 Thrust mechanism 204 Continuously variable transmission output shaft 204a Gear 204s Spline part 204u Step 205a Sun gear 205as Spline part

Claims (2)

[Claims] 1. A continuously variable transmission and a constant transmission respectively connected to a unit input shaft, a sun gear connected to an output shaft of the continuously variable transmission, a carrier connected to the output shaft of the constant transmission, and A planetary gear mechanism consisting of a ring gear connected to the unit output shaft, a power circulation mode clutch interposed in the transmission path from the unit input shaft to the carrier, and a unit output from the output shaft of the continuously variable transmission. A direct coupling mode clutch interposed in the middle of the transmission path of the shaft, a continuously variable transmission output gear coaxial with the input shaft of the continuously variable transmission,
A first gear arranged coaxially with the sun gear of the planetary gear mechanism and a counter gear that is axially supported in parallel with the unit input shaft and meshes with the output gear of the continuously variable transmission and the first gear. Continuously variable transmission output gear train consisting of
A bearing support portion that supports bearings that axially support all the constituent gears of the continuously variable transmission output gear train is provided. The bearing support portions are opposed to each other in the input shaft direction and have an infinite transmission ratio. A continuously variable transmission having an infinite transmission ratio, comprising two bearing support members fixed to a case of the machine. 2. A sun gear of the planetary gear mechanism is a helical gear, and an axial load in at least one direction of the sun gear due to torque transmission is applied to a bearing that axially supports the first gear. An infinitely variable transmission continuously variable transmission according to claim 1, characterized in that.