Power transmission device

A technology of power transmission device and rolling parts, applied in the direction of transmission device, friction transmission device, belt/chain/gear, etc., can solve the problems such as the inability to eliminate the spin torque and the reduction of torque transmission efficiency.

Inactive Publication Date: 2015-04-29
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the continuously variable transmission in this case, a thrust force is generated between the rolling member and the first rotating element, and the thrust force is dissipated as heat, thereby reducing the torque transmission efficiency.
In addition, in the continuously variable transmission described in Patent Document 1, although adjacent planetary balls are connected by thin rod-shaped members, the spin moment generated in each planetary ball cannot be eliminated.

Method used

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Embodiment 1

[0022] based on Figure 1 to Figure 6 Embodiment 1 of the power transmission device according to the present invention will be described. Here, as the power transmission device, a continuously variable transmission will be described as an example.

[0023] First, use figure 1 An example of the continuously variable transmission of the first embodiment will be described. figure 1 The reference numeral 10 in the figure shows the continuously variable transmission of the present embodiment 1. This continuously variable transmission 10 has a continuously variable transmission mechanism constituting a transmission unit.

[0024] This continuously variable transmission mechanism is a so-called traction planetary gear mechanism, and includes first to fourth rotation elements 11 to 14 that can rotate relative to each other, and the first to fourth rotation elements 11 to 14 have a common rotation center axis. R1; and a plurality of fifth rotation elements 15 having a rotation cent...

Embodiment 2

[0056] based on Figure 7 Embodiment 2 of the power transmission device according to the present invention will be described. In this second embodiment as well, a continuously variable transmission will be described as an example of the power transmission device.

[0057] The continuously variable transmission 10 of the second embodiment is obtained by changing the rotation suppressing portion 30 of the first embodiment into another form.

[0058] For example, the rotation suppressing portion 30 of the first embodiment requires a new member called a convex curved body 31 compared to the conventional continuously variable transmission having the annular member 21 , which may lead to an increase in cost. Therefore, in the continuously variable transmission 10 of the second embodiment, in order to suppress an increase in cost, it is replaced with Figure 7 The rotation inhibiting portion 130 is shown.

[0059] The rotation suppressing portion 130 includes: a convexly curved su...

Embodiment 3

[0069] based on Figure 8 Embodiment 3 of the power transmission device according to the present invention will be described. Embodiment 3 is also described by taking a continuously variable transmission as an example of a power transmission device.

[0070] The continuously variable transmission 10 of the third embodiment is obtained by changing the rotation suppressing part 30 of the first embodiment or the rotation suppressing part 30 of the second embodiment to another form.

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Abstract

A power transmission device includes first and second rings arranged opposite each other, having a common rotation center axis, and rotatable relative to each other; a plurality of planetary balls having rotation center axes parallel to the rotation center axis, and radially arranged between the first and second rings and around the rotation center axis; a transmission control unit configured to change a rotation ratio between the first and second rings by changing the respective contact points of the first and second rings and each of the planetary balls through tilting motion of each of the planetary balls; and a rotation restricting unit disposed between the planetary balls adjacent to each other.

Description

technical field [0001] The present invention relates to a power transmission device capable of changing the rotational speed (rotational speed) between input and output. Background technique [0002] Conventionally, there are known power transmission devices that change the ratio of rotational speeds (rotational speeds) between input and output, that is, the gear ratio. Furthermore, such a power transmission device includes a continuously variable transmission that continuously changes a gear ratio, for example, a so-called traction planetary gear mechanism composed of a plurality of rotating elements. The traction planetary gear mechanism includes: first to fourth rotation elements having a common rotation center axis and being rotatable relative to each other; and a rolling member as a fifth rotation element. The rolling member has a rotation center axis other than the above-mentioned rotation center axis. The first rotating element is shaped like a column or a cylinder,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H15/52
CPCF16H15/52
Inventor 小川裕之村上新友松大辅椎名贵弘
Owner TOYOTA JIDOSHA KK
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