JPH116555A - Continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the full-width of a continuously variable transmission and improve storing efficiency for an engine room. SOLUTION: A shaft end part 8a of a torque converter output shaft 8 extending from a tubine runner of a torque converter is interposed in a shaft end part 13c of a pulley input shaft 13a extending from a primary pulley 13 of a continuously variable transmission 4, an input part 10d of a clutch drum 10a provided on a forward clutch 10 of a forward and backward switching device 3 is spline-engaged to the interposed shaft end part 8a and an output part 10e of a hub 10b provided on the forward clutch 10 is spline-engaged to the outer periphery of the shaft end part 13c of the pulley input shaft 13a. The input part 10d and the output part 10e are disposed at an almost overlapped location in the shaft direction of the superposed part of both of the shaft end parts 8a, 13b and the width of the forward and backward switching device 3 is shortened. Thus, the full-width of the continuously variable transmission is reduced.

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 in which a planetary forward / reverse switching device is disposed between a starting device and a continuously variable transmission.

[0002]

2. Description of the Related Art In general, a continuously variable transmission mounted on a vehicle such as an automobile includes a continuously variable transmission which is a main transmission mechanism for performing a shift in a running state, and a power between an engine and a transmission at the time of starting. The vehicle includes a starting device that controls transmission, and a forward / reverse switching device that reverses the rotational direction of the driving force transmitted to the transmission in order to reverse the vehicle.

When a planetary gear is used as the forward / reverse switching device, for example, Japanese Patent Publication No. 3-72857 discloses a torque converter as a starting device.
An input shaft of a planetary forward / reverse switching device axially mounted on a turbine runner of the torque converter and a clutch drum constituting a forward clutch of the planetary forward / reverse switching device are connected by a spline clutch between the forward clutch and the hub. The front end of the input shaft is pivotally supported on the stepped portion on the back of the pump cover, and the sun gear of the planetary gear and the hub are spline-engaged with the input shaft which is mounted on the primary pulley of the continuously variable transmission. Techniques are disclosed.

For example, Japanese Patent Application Laid-Open No. 58-94667 discloses a forward / reverse drive that connects an end of an output shaft of a forward / reverse switching device which is mounted on a primary pulley of a continuously variable transmission to a turbine runner of a torque converter. A technique is disclosed in which the input shaft of the switching device is inserted into and supported by a hollow portion formed at the tip of the input shaft, and the input shaft of the forward / reverse switching device is supported by a pump cover of an oil pump.

[0005]

When the engine and the continuously variable transmission, which are integrally assembled, are mounted horizontally in an engine room provided at the front of the vehicle body, the entire width of the engine is naturally stored in the engine room. Must be of the possible dimensions.

However, recent engine rooms are provided on both sides with frames for absorbing the impact of a collision.
A front tire is provided outside the frame. The frame needs to have a certain cross-section sufficient to maintain the steering stability of the vehicle and to maintain the rigidity in order to guarantee the collision safety. It is necessary to set a large turning angle in order to secure the steering performance.

In order to sufficiently satisfy both the volume of the engine room and the steering angle of the front tire, it is sufficient to increase the size of the vehicle body. However, it is not possible to increase the size of the vehicle body only for the purpose of satisfying these requirements. However, simply increasing the weight of the vehicle, lowering the maneuverability, and hindering the efficiency of the drive system and deteriorating the fuel efficiency are not feasible.

As a result, the volume in the engine room tends to be relatively narrow, and it is necessary to shorten the entire width of the engine and the continuously variable transmission.

However, in the continuously variable transmission disclosed in Japanese Patent Publication No. 3-72857, a spline engagement portion between a clutch drum of a forward / reverse switching device and an input shaft connected to a turbine runner of a torque converter is provided. Is disposed between the pump cover and the hub of the forward clutch, so that the entire width of the continuously variable transmission becomes longer by that amount, and the intermediate shaft extending from the primary pulley of the continuously variable transmission. Since the sun gear of the forward-reverse switching device and the hub of the forward clutch are spline-engaged on the outer periphery, the structure is complicated, and it is difficult to house the sun gear in an engine room, which has recently tended to become smaller.

On the other hand, in the continuously variable transmission disclosed in Japanese Patent Application Laid-Open No. 58-94667, the front end of the output shaft of the forward / reverse switching device is connected to the input shaft of the forward / reverse switching device via a bearing. Since the input shaft is rotatably supported and the input shaft is rotatably supported on the oil pump cover via another bearing, the structure is complicated, and the overall width of the continuously variable transmission is reduced from the current configuration. It is difficult to convert.

On the other hand, techniques for reducing the overall width of the continuously variable transmission include, for example, reducing the pulley ratio of the continuously variable transmission or reducing the width of the belt wound between both pulleys of the continuously variable transmission. Alternatively, it is conceivable to reduce the thickness of each member or to reduce the clearance between the members. However, these techniques are realized because the function and the durability of the continuously variable transmission may be reduced. Poor sex.

In view of the above circumstances, the present invention makes it possible to reduce the entire width of the engine room without lowering its durability and functions and without complicating the structure, and easily apply it to a recent engine room which tends to become smaller. It is an object to provide a continuously variable transmission that can be mounted.

[0013]

To achieve the above object, a first continuously variable transmission according to the present invention is provided with a forward / reverse switching device disposed between a starting device and a continuously variable transmission. A forward clutch that couples the starting device and the primary pulley of the continuously variable transmission, a planetary gear, and a sun gear of the planetary gear that is fixed to a ring gear provided on the planetary gear during reverse traveling and that is connected to an input shaft of the primary pulley. A reverse brake for reversing the output shaft, the shaft end of the input shaft extending from the primary pulley being supported on the outer periphery of the shaft end of the output shaft extending from the starting device, and a clutch drum of the forward clutch. The input unit provided at the end of the output shaft is inserted between the shaft end of the output shaft and the shaft end of the input shaft. With linked, also integrally formed with a sun gear of the planetary gear to the shaft end of the input shaft,
An output portion provided on a hub of a forward clutch is connected to a shaft end of the input shaft.

The second continuously variable transmission is characterized in that, in the first continuously variable transmission, an output portion provided on the hub is spline-engaged with a shaft end of the input shaft.

A third continuously variable transmission is characterized in that, in the first continuously variable transmission, the hub is meshed with a sun gear formed integrally with a shaft end of the input shaft.

A fourth continuously variable transmission couples the starting device and a primary pulley of the continuously variable transmission to a forward / reverse switching device disposed between the starting device and the continuously variable transmission during forward traveling. A forward clutch, a planetary gear, and a reverse brake that reverses a sun gear of the planetary gear connected to an input shaft of the primary pulley by fixing a ring gear provided on the planetary gear when the vehicle travels backward. A shaft end of an input shaft extending from the primary pulley is supported on an outer periphery of a shaft end of an output shaft to be output, and an input portion provided on a clutch drum of the forward clutch and an output provided on a hub of the forward clutch. And between the shaft end of the output shaft and the shaft end of the input shaft,
The input unit may be connected to an outer periphery of a shaft end of the output shaft, and the output unit may be connected to an inner periphery of a shaft end of the input shaft.

The fifth continuously variable transmission couples the starting device and the primary pulley of the continuously variable transmission to a forward / reverse switching device disposed between the starting device and the continuously variable transmission during forward traveling. A forward clutch, a planetary gear, and a reverse brake for fixing a ring gear provided on the planetary gear during reverse travel and for reversing a sun gear of the planetary gear connected to an input shaft of the primary pulley, the output of the starting device. While supporting the shaft to the case body, the shaft end of the output shaft is inserted into the shaft end of the input shaft extending from the primary pulley, and the shaft end of the output shaft is connected to the clutch drum of the forward clutch. The input unit provided is connected, and the output unit provided on the hub of the forward clutch is connected to the shaft end of the input shaft. Characterized in that was.

A sixth continuously variable transmission is characterized in that, in the fourth or fifth continuously variable transmission, a sun gear of the planetary gear is integrally formed on an outer periphery of a shaft end of the input shaft.

In the first continuously variable transmission, the shaft end of the output shaft extending from the starting device and the shaft end of the input shaft extending from the primary pulley of the continuously variable transmission overlap on a shaft on which the shaft overlaps. By arranging the input portion of the clutch drum and the output portion provided on the hub of the forward clutch at positions substantially overlapping in the axial direction, the width direction of the forward / reverse switching device is shortened, and the forward / reverse switching device is further configured. The sun gear of the planetary gear is formed integrally with the input shaft to reduce the number of parts,
Thereby, the entire continuously variable transmission is reduced in size.

In the second continuously variable transmission, in the first continuously variable transmission, the output portion provided on the hub is spline-engaged with the shaft end of the input shaft of the primary pulley, so that the assemblability is improved. Will be better.

In the third continuously variable transmission, the structure of the first continuously variable transmission is simplified by engaging an output portion provided on the hub with a sun gear of the planetary gear.

In the fourth continuously variable transmission, a shaft end of an output shaft extending from the starting device, and an input shaft extending from a primary pulley of the continuously variable transmission that is supported on the outer periphery of the shaft end are provided. In between, the input unit provided on the clutch drum of the forward clutch and the output unit provided on the hub of the forward clutch are inserted, the input unit is connected to the shaft end of the output shaft, and the output unit is further connected. By connecting to the shaft end of the input shaft, the width of the forward / reverse switching device is reduced.

In the fifth continuously variable transmission, the output shaft of the starting device is supported by the case main body, so that the bearing area of the output shaft with respect to the case main body is set large.
A forward / reverse switching device is formed on a shaft on which the shaft end of the output shaft and the shaft end of the input shaft extending from the primary pulley of the continuously variable transmission loosely inserted around the shaft end overlap. By arranging the input portion provided on the clutch drum of the forward clutch and the output portion provided on the hub of the forward clutch at positions substantially overlapping in the axial direction, the width of the forward / reverse switching device is reduced.

In the sixth continuously variable transmission, the fourth or fifth
In the continuously variable transmission described above, the sun gear of the planetary gear constituting the forward / reverse switching device is integrally formed on the outer periphery of the shaft end of the input shaft, so that the number of parts is reduced and the overall size of the continuously variable transmission is reduced. .

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention. Reference numeral 1 in FIG. 1 denotes a continuously variable transmission, which includes a starting device 2, a forward / reverse switching device 3, and a continuously variable transmission 4. An engine A is connected to an input side of the continuously variable transmission 1.

The starting device 2 is provided with a clutch fixing plate 5 connected to the crankshaft A1 of the engine A. A torque converter case 6 to which the clutch fixing plate 5 is fixed is provided with a pump impeller 7a of the torque converter 7. It is installed continuously. Further, a torque converter output shaft 8 extending from a turbine runner 7b opposite to the pump impeller 7a faces the forward / reverse switching device 3.

A lock-up clutch 6a connected to the turbine runner 7b is provided opposite to the torque converter case 6. This lock-up clutch 6a
Is engaged with the torque converter case 6, the driving force of the engine A is transmitted directly to the pulley input shaft 13 a of the continuously variable transmission 4 via the turbine runner 7 b without passing through the torque converter 7.

The stator 7 of the torque converter 7
c is the starting device 2 via the one-way clutch 7d.
Is connected to a stator shaft 7e which is directly or indirectly fixed to the main body case 2a. Reference numeral 9 denotes an oil pump that is driven to rotate by the pump impeller 7a.

The forward / reverse switching device 3 is provided with a forward clutch 10, a planetary gear 11, and a reverse brake 12. The torque converter output shaft 8 extending from the turbine runner 7b of the torque converter 7 is connected to the forward clutch. 10 and is connected to a clutch drum 10a provided in the forward clutch 1.
The hub 10b is connected to a pulley input shaft 13a extending from a primary pulley 13 provided on the continuously variable transmission 4, and further, a shaft end portion 13 of the pulley input shaft 13a.
The sun gear 11a of the planetary gear 11 is integrally formed with the sun gear 11c.

The sun gear 1 of the planetary gear 11
Pinion gear 11 for connecting ring gear 1a with ring gear 11b
c is connected to the forward clutch 1 via the carrier 11d.
0 clutch drum 10a. Further, the reverse brake cylinder 12 a provided on the reverse brake 12 is connected to the body case 3 of the forward / reverse switching device 3.
a is connected continuously so as to be able to advance and retreat in a state where the rotation direction is restricted. By the operation of the reverse brake cylinder 12a, the planetary gear 1
When the rotation of the first ring gear 11b is stopped, the pinion gear 11c rotates, and the pulley input shaft 13a is reversely driven in a reduced state via the sun gear 11a.

The primary pulley 13 of the continuously variable transmission 4 and a secondary pulley 14 provided opposite to the primary pulley 13 are connected via a belt 15.
Pulley output shaft 14 that supports this secondary pulley 14
a is connected via a reduction gear group 15a of the final reduction device 15 to a differential device 15b mounted on a drive shaft 16 of a front wheel or a rear wheel.

The continuously variable transmission 4 has a pulley groove width set by a primary hydraulic pressure supplied to a primary hydraulic chamber 13b provided in the primary pulley 13. Further, the secondary pulley 1 is driven by a secondary hydraulic pressure supplied to a secondary hydraulic chamber 14 b provided in the secondary pulley 14.
4 is given a tension necessary for torque transmission. The primary hydraulic pressure and the secondary hydraulic pressure are set by a transmission control unit (TCU) (not shown) based on the engine operating state and the like, and the groove widths of both pulleys 13 and 14 in the continuously variable transmission 4 are set in an inversely proportional state. Obtain the desired reduction ratio.

By the way, as shown in FIG. 2, the shaft end 8a of the torque converter output shaft 8 extending from the turbine runner 7b of the torque converter 7 is connected to the primary pulley 13
And is rotatably supported by being inserted into a shaft end 13c of a pulley input shaft 13a extending from the shaft. The base of the pulley input shaft 13a is supported by a main body case 3a of the forward / reverse switching device 3 via a bearing 17. The outer diameter of the sun gear 11a is formed to be slightly smaller than the base of the pulley input shaft 13a which is supported by the bearing 17 of the input shaft 13a. The press-fitting of the pulley input shaft 13a into the bearing 17 is facilitated.

Further, a concentric concave portion 10c is formed in the clutch drum 10a, and the concave portion 10c is formed on the outer periphery of the pump cover 3b of the oil pump 9 integrally formed with the main body case 2a of the starting device 2 by a sealing member. The clutch drum 1 is rotatably supported via
The input portion 10d formed at the center of rotation of the shaft 0a is a shaft end 8 of both the torque converter output shaft 8 and the pulley input shaft 13a.
a and 13c, and is spline-engaged with the shaft end 8a of the torque converter output shaft 8.

An output portion 10e formed in the direction of the center of rotation of the hub 10b is engaged with a spline having a slightly smaller diameter at the shaft end 13c of the pulley input shaft 13a.

Next, the operation of the present embodiment having the above configuration will be described. During forward running, the forward clutch 10 is in the engaged state, and the reverse brake 12 is in the released state. As a result, the driving force from the turbine runner 7b of the torque converter 7 is spline-engaged with the shaft end 8a of the torque converter output shaft 8 extending from the turbine runner 7b.
0 is transmitted to the input portion 10d, and then the pulley input shaft 13a of the primary pulley 13 provided in the continuously variable transmission 4 spline-engaged with the output portion 10e of the hub 10b of the forward clutch 10 is rotated forward.

On the other hand, during reverse running, the reverse brake 12 is engaged and the forward clutch 10 is released. As a result, when the reverse brake 12 is engaged, the ring gear 11b of the planetary gear 11 is fixed, and the driving force transmitted from the torque converter output shaft 8 to the clutch drum 10a is applied to the planetary gear 11 connected to the clutch drum 10a. When the transmission is transmitted to the carrier 11d, the pinion gear 11c supported by the carrier 11d rotates because the ring gear 11 is fixed, and the pulley input shaft 13a is rotated in the reverse direction with the speed reduced through the sun gear 11a. Let it.

When both the forward clutch 10 and the reverse brake 12 are in the released state, the planetary gear 11 is in a neutral state in which the planetary gear 11 idles.

When the lock-up clutch 6a is engaged, the clutch shaft A1 of the engine A is directly connected to the torque converter output shaft 8 via the fixed plate 5, the lock-up clutch 6a, and the turbine runner 7b of the torque converter 7 to lock. It goes up.

In this embodiment, the clutch drum 1
The input portion 10d of the hub 10b and the output portion 10e of the hub 10b are disposed at positions substantially overlapping in the axial direction, so that the width of the forward / reverse switching device 3 can be shortened by the amount of the overlap, and accordingly, The integrated continuously variable transmission 1 and the engine A can be easily mounted in a horizontal state in a recent engine room in which the total width W of the continuously variable transmission 1 is shortened and narrowed. Becomes possible.

Further, since the pulley input shaft 13a is directly supported by the main body case 3a via the bearing 17, the support accuracy of the primary pulley 13 is high, and high rigidity can be obtained. Further, since the outer diameter of the sun gear 11a is formed to be slightly smaller than the base of the pulley input shaft 13a that is supported by the bearing 17, the pulley input shaft 13a may damage the sun gear 11a. Press-fitting can be easily performed.

FIG. 3 shows a second embodiment of the present invention. In the present embodiment, the shaft end 1 of the pulley input shaft 13a is
A pinion gear 11c of the planetary gear 11 and an output portion 10e of a hub 10b provided in the forward clutch 10 are meshed with a sun gear 11a integrally formed with the sun gear 3c. In the first embodiment, the output portion 10e of the hub 10b is connected to the shaft end 13c of the pulley input shaft 13a.
In this embodiment, the sun gear 11a is connected to the output portion 1 of the hub 10b.
By meshing 0e, the structure is further simplified,
The production becomes easy to that extent.

FIG. 4 shows a third embodiment of the present invention. In the present embodiment, the output portion 10e of the hub 10b provided in the forward clutch 10 is formed in a boss shape so as to face the inner periphery of the shaft end 13c of the pulley input shaft 13a, and the shaft end 13c is formed. The spline is engaged with the inner periphery.

According to the present embodiment, the clutch drum 1
0a, an output 10e of the hub 10b,
Since the sun gear 11a and the sun gear 11a are substantially overlapped in the coaxial direction, the width direction of the forward / reverse switching device 3 can be further shortened as compared with the above-described first and second embodiments.

FIG. 5 shows a fourth embodiment of the present invention. In the present embodiment, the torque converter output shaft 8 is rotatably supported on the inner periphery of the pump cover 3b of the oil pump 3 via an oil bushing 18 so that the torque converter output shaft 8 is attached to the pump cover 3b. Since the shaft is supported, there is no need to support the shaft end 8a of the torque converter output shaft 8 on the pulley input shaft 13a, and accordingly, the shaft length of the torque converter output shaft 8 can be shortened. Since the shaft 8 can be supported with a relatively wide width with respect to the inner periphery of the pump cover 3b, the durability is improved. Further, the pulley input shaft 13a is drilled on the tip end surface of the input shaft 13a.
The depth of the hole for loosely inserting the shaft end 8a of the torque converter output shaft 8 can be reduced.

Reference numeral 8b denotes a hydraulic circuit formed in the torque converter output shaft 8. The oil bushing 18 has an oil hole 18a communicating with the hydraulic circuit 8b.

[0047]

According to the first aspect of the present invention, the shaft end of the output shaft extending from the starting device and the input shaft extending from the primary pulley of the continuously variable transmission in which the shaft end is inserted. Since the input portion of the clutch drum and the output portion provided on the hub of the forward clutch are disposed substantially coaxially in the radial direction of each of the shaft ends, the input portion of the clutch drum and the output portion provided on the hub of the forward clutch are arranged in a portion overlapping with the shaft ends.
The width direction of the forward / reverse switching device is shortened, whereby the entire width of the continuously variable transmission can be reduced. It becomes possible to mount the engine in a horizontal state without difficulty. Further, by integrally forming the sun gear of the planetary gear constituting the forward / reverse switching device with the input shaft, the number of parts can be reduced and the structure can be simplified.

According to the second aspect of the present invention, in the first aspect of the present invention, the output portion provided on the hub is spline-engaged with the shaft end of the input shaft of the primary pulley to facilitate assembly. Can be

According to the third aspect of the invention, in the first aspect of the invention, the output portion provided on the hub is meshed with the sun gear of the planetary gear, so that the structure can be simplified.

According to the present invention, the shaft end of the output shaft extending from the starting device and the input shaft extending from the primary pulley of the continuously variable transmission that is supported on the outer periphery of the shaft end. An input unit provided on a clutch drum of a forward clutch and an output unit provided on a hub of the forward clutch are inserted therebetween, and the input unit is connected to a shaft end of the output shaft. Since the input portion of the clutch drum and the output portion of the hub are disposed at positions substantially overlapping in the axial direction of the two shaft ends, the forward / backward switching device is accordingly provided. The width direction of the continuously variable transmission can be shortened, thereby reducing the overall width of the continuously variable transmission. Mounted comfortably in the placed state Door is possible.

According to the fifth aspect of the present invention, since the output shaft of the starting device is supported by the case main body, the output shaft can be supported by the case main body with a relatively wide width. , Durability can be improved. Further, a forward clutch constituting a forward / reverse switching device is provided at a portion where the shaft end of the output shaft overlaps with the shaft end of the input shaft extending from the primary pulley of the continuously variable transmission inserted through the shaft end. Since the input portion provided on the clutch drum and the output portion provided on the hub of the forward clutch are disposed at positions substantially overlapping in the axial direction, the width direction of the forward / reverse switching device is correspondingly shortened. The overall width of the continuously variable transmission can be reduced, and the integrated continuously variable transmission and the engine can be easily mounted in a horizontal state in the recent engine room, which is becoming smaller. Will be possible.

According to a sixth aspect of the present invention, in the invention of the fourth or fifth aspect, the sun gear of the planetary gear constituting the forward / reverse switching device is integrally formed on the outer periphery of the shaft end of the input shaft to reduce the number of parts. Thus, the size of the continuously variable transmission can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic view of a continuously variable transmission according to a first embodiment.

FIG. 2 is a sectional view of a main part of the forward / reverse switching device.

FIG. 3 is a sectional view of a main part of a forward / reverse switching device according to a second embodiment;

FIG. 4 is a sectional view of a main part of a forward / reverse switching device according to a third embodiment;

FIG. 5 is a sectional view of a main part of a forward / reverse switching device according to a fourth embodiment;

[Explanation of symbols]

 A: Engine 1: Continuously variable transmission device 2: Starting device 3: Forward / reverse switching device 3b: Case body (pump cover) 4: Continuously variable transmission 8: Torque converter output shaft 8a, 13c: Shaft end 10: Forward clutch 10a ... clutch drum 10d ... input section 10e ... output section 11 ... planetary gear 11a ... sun gear 11b ... ring gear 12 ... reverse brake 13 ... primary pulley 13a ... pulley input shaft 13b ... primary hydraulic chamber

Claims (6)

[Claims] A forward clutch that couples the starting device and a primary pulley of the continuously variable transmission during forward traveling; a planetary gear; and a forward / reverse switching device disposed between the starting device and the continuously variable transmission. A reverse brake that reverses a sun gear of the planetary gear connected to an input shaft of the primary pulley while fixing a ring gear provided on the planetary gear during reverse traveling, and an output shaft extending from the starting device. A shaft end of an input shaft extending from the primary pulley is supported on the outer periphery of the shaft end of the input shaft, and an input portion provided on a clutch drum of the forward clutch is connected to a shaft end of the output shaft and a shaft of the input shaft. And the sun gear of the planetary gear is connected to the shaft end of the output shaft and is connected to the shaft end of the output shaft. And an output unit provided on a hub of a forward clutch is connected to a shaft end of the input shaft. 2. The continuously variable transmission according to claim 1, wherein an output portion provided on the hub is spline-engaged with a shaft end of the input shaft. 3. The continuously variable transmission according to claim 1, wherein said hub is meshed with a sun gear formed integrally with a shaft end of said input shaft. 4. A forward / reverse switching device disposed between a starting device and a continuously variable transmission, a forward clutch for connecting the starting device and a primary pulley of the continuously variable transmission during forward traveling, a planetary gear, A reverse brake that reverses a sun gear of the planetary gear connected to an input shaft of the primary pulley while fixing a ring gear provided on the planetary gear during reverse traveling, and an output shaft extending from the starting device. The input shaft provided on the clutch drum of the forward clutch and the output provided on the hub of the forward clutch are supported on the outer periphery of the shaft end of the input shaft extending from the primary pulley. The input shaft is inserted between the shaft end of the output shaft and the shaft end of the input shaft, and the input unit is connected to the shaft end of the output shaft. A continuously variable transmission, wherein the output portion is connected to an inner periphery of a shaft end of the input shaft. 5. A forward / reverse switching device disposed between a starting device and a continuously variable transmission, a forward clutch connecting the starting device and a primary pulley of the continuously variable transmission during forward traveling, a planetary gear, A reverse brake that fixes a ring gear provided on the planetary gear during reverse travel and connects the sun gear of the planetary gear in reverse with the input shaft of the primary pulley, the output shaft of the starting device being a case body. And an input end provided on a clutch drum of the forward clutch at a shaft end of the output shaft, the shaft end of the output shaft being inserted into a shaft end of an input shaft extending from the primary pulley. That the output portion provided on the forward clutch hub is connected to the shaft end of the input shaft. Continuously variable transmission and symptoms. 6. The continuously variable transmission according to claim 4, wherein a sun gear of the planetary gear is formed integrally with an outer periphery of a shaft end of the input shaft.