Single-carrier multi-speed transmission

Abstract

This invention discloses a single-carrier multi-stage transmission comprising a single carrier and a sun gear, wherein at least two stages of two-stage planetary gears and corresponding internal gears are helically mounted on the single carrier, and the sun gear meshes with the first stage of two-stage planetary gears. By helically mounting the two-stage planetary gears, the device can be configured with multiple stages on the single carrier according to the speed change requirements, and is characterized by its simple structure, ease of manufacture, and convenience of installation. Theoretically, this invention realizes the setting of an infinite number of stages on a single axis, can meet the requirements of various devices that need speed changes, and provides a novel gear speed change solution for the design of reduction gears.

Description

Technical Field

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[0001] The present invention belongs to the technical field of planetary gear transmission devices, and particularly relates to a multi-stage transmission device with a single carrier.

Background Art

[0002] Transmission by planetary gears is widely used, mainly for vehicle transmissions, especially in the automotive field, but it is rarely seen in the transmission of other machines. However, in order to achieve multi-stage transmission, conventional planetary gear transmission devices usually require multiple carriers, and due to the presence of multiple axes and multiple centers, the structure is complex, making manufacturing and installation difficult.

Summary of the Invention

Problems to be Solved by the Invention

[0003] The problem to be solved by the present invention is to provide a multi-stage transmission device with a single carrier that has a scientific and reasonable structure and is easy to manufacture.

Means for Solving the Problems

[0004] In order to solve the above problems, the present invention adopts the following technical solutions.

[0005] A multi-stage transmission device with a single carrier including a single carrier, a sun gear, and an internal gear, wherein at least two-stage two-stage planetary gears and corresponding internal gears are spirally provided on the single carrier, and the sun gear meshes with the first-stage two-stage planetary gear.

[0006] Four-stage two-stage planetary gears are spirally provided on the single carrier.

Effects of the Invention

[0008] [Figure 1] This is a schematic diagram illustrating the structure of the single-carrier multi-speed transmission of the present invention. [Figure 2] This is a schematic diagram illustrating the structural principle of the single-carrier multi-speed transmission of the present invention. [Modes for carrying out the invention]

[0009] Basic structure As shown in Figures 1 and 2, the single-carrier multi-speed transmission of the first embodiment of the present invention includes a single carrier, a sun gear, and an internal gear, wherein at least two stages of two-stage planetary gears 3 and corresponding internal gears 1 are helically arranged on the single carrier 2, and the sun gear 4 meshes with the first stage of two-stage planetary gears. Depending on the required number of stages, multiple stages can be set on the single carrier, and Figures 1 and 2 show a four-stage transmission, in which four stages of two-stage planetary gears and corresponding internal gears are helically arranged on the single carrier.

[0010] As shown in Figure 3, the second embodiment of the present invention is an improvement on the first embodiment, the difference being that, starting from the second stage of the two-stage planetary gear, each stage of the two-stage planetary gear is a two-stage planetary gear 5 with internal teeth, and has internal teeth 6 and external teeth 7.

[0011] Operating principle The multi-stage transmission of the present invention has only a single carrier and a single sun gear. Power is input from the sun gear, and all internal gears and double planetary gears are set to rotate together, but each internal gear rotates at a different speed. If one of the internal gears is locked, the carrier rotates and changes speed while decelerating and outputs power. Conversely, power is input from the single carrier, and the sun gear changes speed while increasing speed and outputs power. To achieve the above effect, the double planetary gears and corresponding internal gears of each stage can be arranged helically on the single carrier so that they can operate in coordination. Specifically, this is as follows.

[0012] In the first embodiment, the transmission rules are such that the direction of rotation is reversed for each stage; that is, the single carrier of the first stage internal gear is set to output forward rotation, the single carrier of the second stage internal gear is set to output reverse rotation, the single carrier of the third stage internal gear is set to output forward rotation, and the single carrier of the fourth stage internal gear is set to output reverse rotation. In this way, a multi-stage transmission can be designed with different stages and reversed rotation directions for each stage as needed.

[0013] In the second embodiment, since a two-stage planetary gear 5 with internal gears is used from the second stage, the transmission rule is that each stage moves in the same direction; that is, the two-stage planetary gear of the first stage meshes with the two-stage planetary gear with internal gears of the second stage, the two-stage planetary gear with internal gears of the second stage meshes with the two-stage planetary gear with internal gears of the third stage, and the two-stage planetary gear with internal gears of the third stage meshes with the two-stage planetary gear with internal gears of the fourth stage. In this way, a multi-stage transmission can be designed with different stages as needed, and with the same direction of rotation at each stage.

[0014] Similarly, referring to the second embodiment, it is also possible to achieve the same rotation direction for each stage by adding carrier gears between the two-stage planetary gears of each stage in the first embodiment.

[0015] As described above, the three embodiments may be used individually or in combination, and the only prerequisite is that the two-stage planetary gears of each stage must be helically mounted on a single carrier. Furthermore, for ease of manufacturing, the single carrier may be manufactured as a single unit, or it may be designed as a separate unit and assembled before use.

[0016] Scope of application Conventional benchtop drill presses require adjusting the belt position when changing gear levels, which is very cumbersome. The multi-speed transmission device utilizing the present invention allows for easy gear changes without the need to displace the belt, and can similarly be used in power tools such as electric drills and hammer drills.

[0017] Electric vehicles and electric tricycles have low power output and do not carry much load, so when using the multi-speed transmission of the present invention, even small vehicles can pull a large load.

[0018] Conventional continuously variable transmissions (CVTs) in automobiles have a small range of speed ratios, making it difficult to cope with complex and ever-changing road conditions. When this invention is used in combination with a CVT, the range of speed ratios becomes larger, contributing to the ability to meet various road conditions.

[0019] The single planetary gear multi-speed transmission of the present invention is particularly suitable for large trucks and other vehicles, and operates in conjunction with the brakes to avoid brake failure and vehicle collisions. When a vehicle is traveling on a highway and it is necessary to brake on a downhill slope and release the accelerator, the multi-speed transmission of the present invention can downshift, reducing the speed through engine resistance. Once the speed is reduced to a safe level, fuel can be supplied and the vehicle can continue to travel, resulting in safety and low fuel consumption.

[0020] Furthermore, this invention enables the control of various bars even when the clutch mechanism is not removed from a conventional vehicle, reducing costs and failure rates. Instead of the conventional on / off operation of the clutch, the hydraulic oil passage can be controlled with the foot, eliminating the need to change operating habits.

[0021] In short, any equipment that needs to shift gears can utilize the present invention.

Explanation of Reference Signs

[0022] 1 internal gear 2 single carrier 3 two-stage planetary gear 4 sun gear 5 two-stage planetary gear with internal gear 6 internal teeth 7 external teeth

Claims

1. A multi-speed transmission for a single carrier, comprising a single carrier, a sun gear, and an internal gear, wherein at least two stages of two-stage planetary gears and corresponding internal gears are helically arranged on the single carrier, and the sun gear meshes with the first stage of two-stage planetary gears.

2. The multi-speed transmission for a single carrier according to claim 1, characterized in that four stages of two-stage planetary gears are spirally arranged on the single carrier.

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