JPH0461981B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a method in which a carrier that rotatably supports a conical planetary wheel is mounted so as to be integrally rotatable with respect to an input shaft.
A fixed ring body for imparting frictional resistance to the conical planetary wheel is provided in contact with a location located outside the rotation axis of the conical planetary wheel from the rotation axis, and the fixed ring body A speed change operation mechanism that slides on the conical planetary wheel is provided, and
The present invention relates to a continuously variable transmission in which an output rotating body interlocked with the conical planetary wheel is arranged concentrically with the input shaft.

[Conventional technology]

In the above-mentioned continuously variable transmission, the fixed wheel body and the conical planetary wheel are pressed against each other by using the elastic restoring force of an elastic member such as a spring, or by a pressurizing mechanism that uses the tightening force of a screw mechanism. What has been done is generally known. With this configuration, even when the drive resistance of the output shaft reaches the set maximum value, the biasing force of the pressing mechanism is resisted so that transmission by pressure contact between the fixed wheel body and the conical planetary wheel is reliably performed. It is set to be able to exert the large pressure required at maximum.

Therefore, when assembling the transmission, the assembly work must be done against the large urging force of the pressure mechanism, and this resistance makes it difficult to assemble the parts.

Therefore, in the past, the intermediate part of the conical planet wheel was supported to be movable in the radial direction with respect to the rotation axis of the carrier, and the conical surface part of the conical planet wheel was supported by a carrier that supported the conical planet wheel so as to be rotatable. A spherical shaft portion is formed at the end opposite to the spherical shaft portion, and the spherical shaft portion is supported on the inner peripheral surface side of the output rotating body and the outer peripheral surface side of the rotating member loosely fitted to the input shaft. In order to do this, a bearing part having an arcuate cross section with a curvature close to that of the spherical shaft part is provided, and the conical planetary wheel is supported swingably around the spherical core of the spherical shaft part ( For example, see British Patent No. 1124670).

[Problem to be solved by the invention]

According to the above-mentioned conventional structure, it is possible to exert a pressing action against the fixed wheel body by applying centrifugal force to the conical planetary wheel, and there is no need to adopt a configuration that applies a pressing force using a strong spring, which simplifies the assembly process. It is useful in that it allows for

However, when such a conventional structure is adopted, the following new problems arise.

In other words, the spherical shaft and the arcuate bearing support the shaft and transmit power through friction due to line contact, so the greater the transmitted power, the more power loss due to slipping and heat generation in the bearing. was likely to occur.

In order to eliminate this inconvenience, it is possible to provide a transmission gear here instead of the spherical shaft portion at the shaft end of the conical planetary wheel, and to form a gear on the output rotating body side that meshes with the transmission gear. However, with this configuration, the conical planetary wheel would move in the axial direction, so it would be difficult to apply a gear transmission structure to this part, and if it were to be applied, the axis of the conical planetary wheel would It is necessary to separately provide a means for regulating positional movement in this direction, which is undesirable because the number of parts increases.

An object of the present invention is to provide a friction-type continuously variable transmission that can efficiently transmit relatively large amounts of power.
Another object is to simplify the structure, reduce the number of parts, and simplify assembly.

[Means to solve the problem]

The technical means of the present invention taken to achieve the above object is to mount a carrier that rotatably supports a conical planetary wheel so as to be integrally rotatable with respect to an input shaft, and fix the carrier to provide frictional resistance to the conical planetary wheel. The circular body,
The conical planetary wheel is provided so as to be in contact with the rotational axis of the conical planetary wheel at a location located outside of the revolution axis, and is provided with a speed change operation mechanism that slides the fixed wheel relative to the conical planetary wheel. In a continuously variable transmission device in which an output rotating body interlocked with a planetary wheel is arranged concentrically with the input shaft, an internal gear is provided in which an interlocking structure between the output rotating body and the conical planetary wheel is formed on the output rotating body. and a transmission gear provided at the shaft end of the conical planetary wheel in a state of meshing with this internal gear, and a planetary wheel support portion of the carrier that supports the conical planetary wheel is configured to move the conical planetary wheel in the axial direction with respect to the carrier. The bearing structure is configured to restrict the movement of the conical planetary wheel and to allow the conical planetary wheel to approach and move away from the fixed wheel body by swinging.

[Effect]

The effects of taking the above technical measures are as follows.

a Even if the fixed wheel body and the conical planetary wheel are in a non-pressure contact state during assembly, the planetary wheel support part may come into contact with the fixed wheel body during transmission due to the centrifugal force that accompanies the revolution of the conical planetary wheel. , the conical planetary wheel and the fixed wheel are brought into contact with each other at a predetermined pressure necessary for transmission.

b The interlocking structure between the output rotating body and the conical planetary wheel,
Since it is composed of an internal gear formed on the output rotating body and a transmission gear provided at the shaft end of the conical planetary wheel in a state that meshes with the internal gear, slippage between the two and heat generated by the slipping can be prevented. Power transmission can be performed with good transmission efficiency without any interference.

c Although the output rotating body and the conical planetary wheel are interlocked by a gear interlocking structure, the support structure for the conical planetary wheel in the carrier restricts the axial movement of the conical planetary wheel, and the conical planetary wheel is fixed. Since it is configured to be swingable so as to allow movement toward and away from the wheel, there is no need to separately provide means for restricting movement in the axial direction with respect to the conical planetary wheel.

〔Effect of the invention〕

Due to the above action, a biasing mechanism using a strong spring is not required, making assembly easier and faster.Although it is a friction-type continuously variable transmission, the transmission between the conical planetary wheel and the output rotating body is possible. By adopting a gear transmission structure in the section, relatively large power can be transmitted efficiently, and the structure can be simplified to reduce the number of parts.

〔Example〕

As shown in the figure, each of a plurality of conical planetary wheels 2 distributed in the circumferential direction of the input shaft 1 is connected to a carrier 3.
A fixed wheel body 6 is attached to the carrier 3 so as to be driven to revolve around its axis P ₁ by the input shaft 1 via the transmission case 4, and is non-rotatably supported by the transmission case 4 via the support rod 5. All conical planetary wheels 2 are brought into contact with a point located outside the axis P1 of the input shaft ₁ with respect to the rotation axis _P2 of the conical planetary wheel 2 so as to impart frictional rotational resistance to each conical planetary wheel 2. The planetary wheel 2 is configured to automatically rotate as it is driven to revolve.

Then, an output shaft (corresponding to an output rotating body) 7 attached to the transmission case 4 while being arranged concentrically with the input shaft 1 is connected to an internal gear 8 connected to the output shaft 7, and an internal gear 8 connected to the output shaft 7. All the conical planets are connected so that the self-rotation of each conical planetary wheel 2 is transmitted through a transmission gear 9 which is integrally rotatably attached to the rotation support shaft 2a of the conical planetary wheel 2 while being engaged with the gear 8. It is linked to car 2.

Also, the gear shift lever 11 attached to the transmission case 4 via the fixture 10 is swung around the axis _P3 , the support rod 5 is slid, and the conical planetary wheel 2
The speed change operation mechanism 12 is configured to slide the fixed wheel 6 relative to the conical planetary wheel 2 so that the contact position of the fixed wheel 6 changes.

Thus, the rotational input through the input shaft 1 is changed in speed by the action of the conical planetary wheel 2 and output from the output shaft 7, and the speed can be changed continuously by the swinging operation of the speed change lever 11. A continuously variable transmission is configured. This transmission is mainly used for agricultural vehicles such as traveling tillers.

In order to enable pressure contact between the conical planetary wheel 2 and the fixed wheel body 6, a self-aligning bearing 13 is used to swing the conical planetary wheel 2 toward and away from the fixed wheel body 6.
The spring 15 is supported by the carrier 3 through the input shaft 1 and swings and biases the conical planetary wheel 2 toward the fixed wheel body 6 through the planetary wheel pressing tool 14 which is slidably attached to the input shaft 1. It is attached to 1.
If the rotational speed of the input shaft 1 is slow and the centrifugal force accompanying the revolution of the conical planetary wheel 2 cannot be obtained sufficiently, the conical planetary wheel 2 is pressed against the fixed wheel body 6 by the spring 15, and the input shaft 1 is When the rotational speed of the shaft 1 is high, the conical planetary wheel 2 is pressed against the fixed ring body 6 by the centrifugal force caused by the revolution of the conical planetary wheel 2 and the spring 15.

The operating limit for alignment of the self-aligning type bearing 13 determines the swing limit of the conical planetary wheel 2 toward the side approaching the fixed wheel body 6, and the conical planetary wheel 2 moves within this swing limit. ridge line L and fixed wheel body 6
The movement trajectory of the conical planetary wheel 2 is configured to be substantially parallel to each other, so that the speed can be changed without causing the conical planetary wheel 2 to swing toward the input shaft 1 as much as possible against centrifugal force.

In this embodiment, by supporting the conical planetary wheel 2 on the carrier 3 with a self-aligning type bearing 13, the movement of the conical planetary wheel 2 in the axial direction with respect to the carrier 3 is restricted, and the conical planetary wheel 2 is supported by the fixed wheel. It has a bearing structure that allows it to approach and move away from 6 by swinging.

[Another example]

To enable the conical planetary wheel 2 to swing due to centrifugal force, instead of using the self-aligning bearing 13, a bearing that supports the conical planetary wheel 2 so that it can rotate is pivoted so that the conical planetary wheel 2 can swing. A support structure may also be adopted, and these are collectively referred to as a planetary wheel support section 13 configured in a bearing structure that allows the fixed wheel body 6 to approach and move away from it by swinging.

[Brief explanation of drawings]

The drawing is a partially cutaway side view showing an embodiment of a continuously variable transmission according to the present invention. 1...Input shaft, 2...Conical planetary wheel, 3...Carrier, 6...Fixed wheel body, 7...Rotating body for output, 8
... Internal tooth gear, 9 ... Transmission gear, 12 ... Speed change operation mechanism, 13 ... Planetary wheel support section, P ₁ ... Revolution axis, P ₂ ... Autorotation axis.

Claims (1)

[Scope of Claims] 1. A carrier 3 that rotatably supports the conical planetary wheel 2 is attached to the input shaft 1 so as to be integrally rotatable, and a fixed ring body 6 is provided for imparting frictional resistance to the conical planetary wheel 2. , is provided so as to be in contact with a location located outside the rotation axis P 1 of the conical planetary wheel ₂ relative to the rotation axis P ₂ , and the fixed ring body 6 is slidably operated with respect to the conical planetary wheel 2 . The continuously variable transmission is provided with a speed change operation mechanism 12 that operates, and an output rotating body 7 interlocked with the conical planetary wheel 2 is arranged concentrically with the input shaft 1, the output rotating body 7 and An interlocking structure with the conical planetary wheel 2 includes an internal gear 8 formed on the output rotary body 7, and a transmission gear 9 provided at the shaft end of the conical planetary wheel 2 in mesh with the internal gear 8. The planetary wheel support part 13 of the carrier 3 that supports the conical planetary wheel 2 is configured to restrict the movement of the conical planetary wheel 2 in the axial direction with respect to the carrier 3, and the conical planetary wheel 2 is connected to the fixed wheel body 6. Continuously variable transmission configured with a bearing structure that allows movement toward and away from the object by rocking.