JPH07180757A - Frictional type continuously variable transmission - Google Patents

Abstract

PURPOSE:To reduce the number of parts so as to design a compact size, by reducing the number of supporting bearings of the input shaft of a transmission mechanism in the transmission whose planetary gear mechanism is connected to the input part of a friction type continuously variable transmission mechanism as an accelerator. CONSTITUTION:An outer ring 18 mounted on the input shaft 12 of a frictional type continuously variable transmission is supported by pressure-contact force acting on the frictional contact face between a double cone 16 and the outer ring 18 by a compression spring 33 arranged between a housing 11 and a holder 32, and the input shaft 12 is supported by the pressure-contact force and a bearing between the outer ring 18 and a sun gear 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention continuously changes the speed of an output shaft that drives a high-speed rotating body such as an impeller of a centrifugal blower, a centrifugal compressor, a radial turbine, etc., even if the input shaft speed fluctuates. The present invention relates to a friction type continuously variable transmission that increases the speed of an output shaft on which an impeller is mounted so that the output shaft can rotate uniformly.

[0002]

2. Description of the Related Art As shown in FIG. 2, a friction type continuously variable transmission has a structure in which an output shaft is rotated at a high speed even if the input shaft rotational speed is small.
The planetary gear mechanism 2 is connected to the input shaft 12 of the gear mechanism 2, and the rotation of the input shaft 25 of the gear mechanism 2 is accelerated to increase the speed of the input shaft 1 of the transmission mechanism 1.
What is transmitted to 2 is considered.

In the transmission mechanism 1, the input shaft 12 and the output shaft 13 are coaxially opposed to each other on both sides of the housing 11, and the support shaft 1 is mounted on a carrier 14 mounted movably around the output shaft.
A plurality of double cones 16 are rotatably attached via 5, and the double cones 16 are in contact with the cone 17 at the end of the output shaft 13 and the outer ring 18 connected to the input shaft 12 at the same time.

In the planetary gear mechanism 2, a plurality of planetary gears 23 are meshed with the internal gear 22, a carrier 24 supporting the planetary gears 23 is connected to an input shaft 25, and the planetary gears 23 are connected to each other. The meshing sun gear 26 is fixed to the input shaft 12 of the speed change mechanism 1.

In this structure, the input shaft 2 of the planetary gear mechanism 2 is
When 5 rotates, the input shaft 12 of the speed change mechanism 1 to which the sun gear 26 is fixed is accelerated by the rotation and revolution of the planetary gear 23 that meshes with the internal gear 22, and the impeller 9 attached to the output shaft 13 is driven. It will rotate at high speed.

[0006]

In the friction type continuously variable transmission having the above structure, the input shaft 12 of the transmission 1 that rotates at high speed by increasing the speed has two bearings 19 arranged in series in the axial direction. 20 supported by its two bearings 19,
20 is trying to receive the load of the moment acting from the outer ring 18 and the like.

However, in the structure in which the input shaft 12 is supported by the two bearings 19 and 20 arranged in series in this way, the length of the supporting portion becomes large, and as a result, there is a problem that the total length of the device is enlarged. .

In particular, in a friction type continuously variable transmission in which a planetary gear mechanism is connected as a speed-up gear, it is necessary to reduce the number of parts in order to make the entire unit compact, improve the assemblability, and reduce the cost. However, the plurality of bearings 19 and 20 incorporated between the friction type continuously variable transmission mechanism and the planetary gear mechanism as described above are factors that hinder compactness and assemblability, and thus there is room for great improvement.

Further, when two or more bearings are used to restrain the input shaft of the friction type continuously variable transmission mechanism, it is difficult to apply a uniform pressure contact force to the three double cones. .

Therefore, the present invention solves the above problems and reduces the number of bearings that support the input shaft of the speed change mechanism,
It is an object of the present invention to provide a friction type continuously variable transmission mechanism that can be made compact and can be reduced in cost.

[0011]

In order to solve the above-mentioned problems, the present invention comprises a friction type continuously variable transmission mechanism and a planetary gear mechanism which is a speed-increasing gearbox of the transmission mechanism. A carrier is movably attached around the output shaft arranged coaxially with the input shaft, and the double cone rotatably attached to this carrier is brought into frictional contact with the cone of the output shaft and the outer ring connected to the input shaft at the same time. The planetary gear mechanism is formed by engaging a plurality of planetary gears with an internal gear and fixing a sun gear that meshes with each planetary gear to the input shaft of the speed change mechanism. A mechanism for generating a pressure contact force between the outer ring and the double cone is provided between the mechanism and the sun gear, and the input shaft is supported by this pressure contact force and one bearing. .

[0012]

As described above, the outer ring connected to the input shaft is relatively supported by the pressure contact force acting on the friction contact surface between the double cone and the outer ring, so that the input shaft is supported by the outer ring portion. The bearing for supporting the input shaft can be deleted.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. 1 of the accompanying drawings.

As shown in FIG. 1, the friction type continuously variable transmission according to the present invention includes a friction type continuously variable transmission mechanism 1, a planetary gear mechanism 2 attached to the input side of the mechanism 1, and a blade attached to the output side. The input to the planetary gear mechanism 2 is constituted by a combination with the vehicle mechanism 3, and the planetary gear and the friction continuously variable transmission mechanism 1 are used.
The speed is increased by and the impeller mechanism 3 is rotated at high speed.

The internal structures of the friction type continuously variable transmission mechanism 1 and the planetary gear mechanism 2 are as described in the section of the prior art,
The same parts as those in FIG. 2 are denoted by the same reference numerals and will not be described.

In this embodiment, the transmission 11 and the planetary gear mechanism 2 have a common housing 11, and the partition wall 3 is provided in the housing 11 so as to separate the two mechanisms 1 and 2.
1 is provided, and a holder 32 that holds a bearing 19 that supports the input shaft 12 is incorporated in the partition wall 31.

The holder 32 for holding the bearing 19 is
It is used as a disk-shaped housing that is externally fitted and fixed to the outer ring of the bearing 19, and a plurality of compression springs 33 serving as a pressurizing mechanism are arranged in parallel in the circumferential direction between the opposing surfaces of the holder 32 and the housing 11. ing.

The compression spring 33 acts on the input shaft 12 through the holder 32 and the bearing 19 in the direction of pulling the input shaft 12 to the outside of the housing 11, and exerts a pressure contact force on the friction contact surface between the double cone 16 and the outer ring 18. ing.

In the above case, the reaction force of the pressure contact force acting on the double cone 16 and the outer ring 18 is the double cone 16
However, since the outer ring of the bearing that supports the output shaft 13 is fixed to the carrier guide 15, the output shaft 13 receives a force that pulls it into the housing 11.

Therefore, the elasticity of the compression spring 33 depends on the input shaft 1.
2 and the output shaft 13 are actuated in a mutually pulling direction, and moreover, an axial force capable of obtaining a constant pressure contact force against the friction contact surface of the double cone 16 is generated.

Thus, when a pressure contact force acts on the friction contact surface between the outer ring 18 and the double cone 16 mounted on the carrier 14 of the friction type continuously variable transmission groove 1, the outer ring 18 is caused by the pressure contact force. 18 is a double cone
6 is supported relatively. That is, since the outer ring 18 and the input shaft 12 are integral with each other, the power transmission shaft including the outer ring 18 and the input shaft 12 is supported at the outer ring 18 portion and the bearing 19 at two locations in the axial direction. become.

Therefore, in the structure of the embodiment, the bearing for supporting the input shaft is omitted by relatively supporting the outer ring by the pressure contact force acting on the frictional contact surface between the double cone and the outer ring. Therefore, the transmission mechanism 1 and the housing 11 of the planetary gear mechanism 2 can have a compact structure.

[0023]

As described above, according to the present invention, since the bearing supporting the input shaft of the speed change mechanism can be omitted, the number of parts can be reduced, thereby reducing the cost and improving the assemblability. And becomes compact. In addition, this support method has an advantage that a uniform pressure contact force can be obtained at three points with respect to the double cone because the bearing portion of the input shaft does not restrain the moment.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment.

FIG. 2 is a vertical sectional view showing a conventional example.

[Explanation of symbols]

 1 Friction-type continuously variable transmission mechanism 2 Planetary gear mechanism 3 Blade gear mechanism 11 Housing 12 Input shaft 13 Output shaft 14 Carrier 15 Carrier guide 16 Double cone 18 Outer ring 19 Bearing 22 Internal gear 23 Planetary gear 25 Input shaft 26 Sun gear 31 Partition wall 32 Holder 33 Compression spring

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[Procedure amendment]

[Submission date] September 1, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (1)

[Claims] 1. A friction type continuously variable transmission mechanism and a planetary gear mechanism which is a speed increaser of the transmission mechanism, wherein the transmission mechanism is capable of moving a carrier around an output shaft coaxially arranged with an input shaft. The double cone, which is rotatably attached to this carrier, is brought into frictional contact with the cone of the output shaft and the outer ring connected to the input shaft at the same time.The planetary gear mechanism consists of multiple planetary gears in the internal gear. And the sun gear that meshes with each planetary gear is fixed to the input shaft of the speed change mechanism, and between the outer ring of the above transmission and the sun gear of the planetary gear mechanism, between the outer ring and the double cone. A friction type continuously variable transmission characterized in that means for generating a pressure contact force is provided, and the input shaft is supported by this pressure contact force and one bearing.