Multi-speed transmission device with single planetary carrier

Abstract

A multi-speed transmission device, comprising a single planetary carrier and a sun gear, at least two stages of duplex planetary gears and corresponding inner gears being arranged on the single planetary carrier in a helical form, and the sun gear being meshed with the first-stage duplex planetary gears. By arranging the duplex planetary gears in a helical form, a plurality of speed ratios can be achieved on just the single planetary carrier according to transmission requirements, thus having the advantages of simple structure, easy manufacturing and convenient installation.

Description

Single planetary carrier multi-speed transmission Technical Field

[0001] The present invention belongs to the technical field of planetary gear transmission devices, and in particular relates to a multi-speed transmission device with a single planetary carrier. Background Art

[0002] Planetary gear transmissions are widely used, primarily in vehicle transmissions, particularly in the automotive sector, but are rarely seen in other mechanical applications. However, existing planetary gear transmissions typically require multiple planetary carriers to achieve multi-speed transmissions, with multiple axes and centers, resulting in complex structures and difficult manufacturing and installation.

[0003] Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a multi-speed transmission device with a single planetary carrier which has a scientific and reasonable structure and is simple and easy to manufacture.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A multi-speed transmission device with a single planetary carrier includes a single planetary carrier, a central gear and an internal gear. At least two stages of double-linked planetary gears and corresponding internal gears are arranged in a spiral form on the single planetary carrier, and the central gear is meshed with the first stage of double-linked planetary gears.

[0007] Four-stage double-linked planetary gears are arranged in a spiral form on a single planet carrier.

[0008] To address the challenges of existing planetary gear transmissions, the inventors have designed and fabricated a multi-speed transmission with a single planetary carrier. This device comprises a single planetary carrier, a central gear, and an internal gear. The carrier is equipped with at least two stages of double-linked planetary gears and corresponding internal gears in a helical pattern, with the central gear meshing with the first stage of double-linked planetary gears. This helical arrangement of the double-linked planetary gears allows for multiple gear positions to be configured within a single planetary carrier, resulting in a simple structure, easy manufacture, and convenient installation. Theoretically, this invention can achieve an unlimited number of gear positions along a single axis, meeting the requirements of various machines requiring speed changes. This provides a novel gear transmission solution for speed reducer design. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] [Corrected 17.04.2024 according to Rule 91] FIG1 is a simplified structural diagram of a first embodiment of a multi-speed transmission device with a single planetary carrier according to the present invention.

[0010] [Corrected 17.04.2024 according to Rule 91] FIG2 is a schematic diagram showing the structural principle of a first embodiment of a multi-speed transmission with a single planetary carrier according to the present invention. [0010.1][Corrected 17.04.2024 according to Rule 91] FIG3 is a schematic structural diagram of a second embodiment of a multi-speed transmission device with a single planetary carrier according to the present invention. [0010.2][Corrected 17.04.2024 according to Rule 91] FIG4 is a simplified structural diagram of a double planetary gear with an internal gear in the multi-speed transmission with a single planetary carrier in FIG3.

[0011] In the figure: 1 internal gear, 2 single planet carrier, 3 double planet gear, 4 center gear, 5 double planet gear with internal gear, 6 internal teeth, 7 external teeth. DETAILED DESCRIPTION

[0012] 1. Basic structure

[0013] As shown in Figures 1 and 2 , a single planetary carrier multi-speed transmission according to a first embodiment of the present invention comprises a single planetary carrier, a sun gear, and an internal gear. At least two stages of double-linked planetary gears 3 and corresponding internal gears 1 are helically arranged on the single planetary carrier 2. The sun gear 4 meshes with the first stage of double-linked planetary gears. Multiple gears can be configured within the single planetary carrier depending on gear requirements. For example, Figures 1 and 2 illustrate a four-speed transmission, in which four stages of double-linked planetary gears and corresponding internal gears are helically arranged on the single planetary carrier.

[0014] [Corrected 17.04.2024 according to Rule 91] As shown in FIG3 , the second embodiment of the present invention is improved on the basis of the first embodiment, the difference being that starting from the second stage duplex planetary gear, each stage of the duplex planetary gear is a duplex planetary gear 5 with an internal gear, which has internal teeth 6 and external teeth 7 (as shown in FIG4 ).

[0015] 2. Working Principle

[0016] The multi-speed transmission of the present invention consists of a single planetary carrier and a single central gear. Power is input from the central gear, and all internal gears and the duplex planetary gears rotate together, but each internal gear rotates at a different speed. Locking one of the internal gears causes the planetary carrier to rotate and output a reduced speed. Conversely, power is input from the single planetary carrier, and the central gear increases the speed of the output. To achieve this effect, the duplex planetary gears and corresponding internal gears must be arranged in a helical pattern on the single planetary carrier for proper operation. The details are as follows:

[0017] In the first embodiment, the transmission principle is reverse rotation at each stage. That is, the fixed first-stage internal gear single planetary carrier outputs forward rotation, the fixed second-stage internal gear single planetary carrier outputs reverse rotation, the fixed third-stage internal gear single planetary carrier outputs forward rotation, and the fixed fourth-stage internal gear single planetary carrier outputs reverse rotation. In this manner, a multi-speed transmission device with reverse rotation at each stage can be designed as needed.

[0018] In the second embodiment, since the duplex planetary gears 5 with internal gears are used starting from the second stage, the transmission principle is the same at all stages. That is, the duplex planetary gears of the first stage mesh with the duplex planetary gears with internal gears of the second stage, the duplex planetary gears with internal gears of the second stage mesh with the duplex planetary gears with internal gears of the third stage, and the duplex planetary gears with internal gears of the third stage mesh with the duplex planetary gears with internal gears of the fourth stage. In this way, a multi-speed transmission with the same direction of rotation can be designed according to needs.

[0019] Similarly, referring to the second embodiment, the same steering at each stage can also be achieved by adding a bridge gear between the double planetary gears at each stage in the first embodiment.

[0020] In summary, the three aforementioned implementations can be used individually or in combination, with the sole prerequisite being that the dual-linked planetary gears of each stage be helically mounted on a single planetary carrier. Furthermore, for ease of fabrication, the single planetary carrier can be manufactured as a single piece, or designed as a split-piece design for complete assembly.

[0021] 3. Scope of application

[0022] The existing bench drill needs to adjust the belt position when changing gears, which is very troublesome. The multi-speed transmission device of the present invention can save the belt shifting and easily change gears. Similarly, it can also be used for power tools such as electric drills and impact drills.

[0023] Since electric vehicles and electric tricycles have low power and low load capacity, if the multi-speed transmission device of the present invention is applied, a calf can also pull a large vehicle.

[0024] The conventional continuously variable transmission mechanism of a vehicle has a small speed ratio range and is difficult to adapt to complex and changeable road conditions. If the present invention is used in combination with the continuously variable transmission mechanism, the speed ratio range is increased, which helps to meet various road conditions.

[0025] The single planetary gear multi-speed transmission of the present invention is particularly suitable for large trucks and other vehicles. It can be used to assist with braking, preventing brake failure and potentially fatalities. When a vehicle is traveling on a highway and needs to brake when descending a steep slope, the multi-speed transmission of the present invention can be used to downshift, allowing the engine resistance to slow the vehicle. Once the vehicle reaches a safe speed, fuel can be supplied to continue driving, achieving both safety and fuel efficiency.

[0026] In addition, the present invention enables existing vehicles to control various stalls without eliminating the clutch mechanism, reducing costs and failure rates. Only the foot is required to control the hydraulic oil circuit instead of the existing clutch disengagement operation, and there is no need to change operating habits.

[0027] In short, the present invention can be used on any machine that requires speed change.

Claims

1. A multi-speed transmission with a single planetary carrier, comprising a single planetary carrier, a sun gear, and an internal gear, characterized in that: At least two stages of double-linked planetary gears and corresponding internal gears are arranged on the single planet carrier in a spiral form, and the central gear is meshed with the first stage of double-linked planetary gears.

2. The multi-speed transmission with a single planetary carrier according to claim 1, characterized in that: The single planet carrier is provided with four-stage double planetary gears in a spiral form.

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