A shift limiter for an AMT transmission

Abstract

The utility model discloses a shift limiting device for AMT transmission, including AMT transmission casing, the AMT transmission casing is opened the fork axle mounting hole of axial through on, the fork axle mounting hole has the fork axle of movable installation, the fork axle is opened the radial through groove on, the AMT transmission casing still is radially symmetrical and is provided with two through -hole pins, and the fork axle mounting hole is located between two through -hole pins. The radial movable installation of radial through groove has the elastic limit board, and the radial both ends of elastic limit board are equipped with bolt hole, and bolt hole corresponds with through -hole pin, and bolt hole and through -hole pin install bolt in, make elastic limit board with AMT transmission casing fixed link. The utility model discloses through the use of elastic limit board, and the fork axle hits on the elastic limit board, and the deformation of elastic limit board delays the impact time, and the impact noise and vibration that greatly reduced after the shift is completed reach the limiting position.

Description

Technical Field

[0001] This utility model belongs to the field of automotive component technology, and relates to AMT transmissions, specifically to a shift limit device for AMT transmissions. Background Technology

[0002] As the current form of automatic transmission for heavy-duty commercial vehicles, AMT (Automated Manual Transmission) has increasingly occupied an important share of the market. At the same time, the market and users are also placing higher and higher demands on the NVH (Noise, Vibration, and Harshness) of AMT transmissions, meaning that shifting comfort is becoming increasingly important.

[0003] Currently, AMT transmissions often employ increased shift force to reduce power interruption and fuel consumption, thereby shortening shift time. However, increasing shift force also has side effects. After a shift, a limiting device is typically used to bring the high-speed shift shaft and shift fork to a quick stop, resulting in impact noise and vibration. The currently used limiting method usually involves the shift fork shaft impacting the AMT transmission housing. Due to the high impact speed of the shift fork shaft, this unbuffered impact limiting causes the impact sound to travel directly from the AMT transmission housing to the outside during shifts, producing a crisp and loud noise. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model proposes a shift limit device for AMT transmissions to solve the technical problem of high impact noise generated when the gear shift is completed and the gear reaches the limit position.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A shift limiting device for an AMT transmission includes an AMT transmission housing, an axially through-hole fork shaft mounting hole on the AMT transmission housing, a shift fork shaft movably mounted in the shift fork shaft mounting hole, a radially through-groove on the shift fork shaft, and two radially symmetrical through-hole pins on the AMT transmission housing, with the shift fork shaft mounting hole located between the two through-hole pins.

[0006] An elastic limiting plate is radially movably installed in the radial through groove. Bolt holes are provided at both ends of the elastic limiting plate. The bolt holes correspond to the through pins. Bolts are installed in the bolt holes and through pins to fix the elastic limiting plate to the AMT transmission housing.

[0007] This utility model also has the following technical features: The number of elastic limiting plates is one or more.

[0008] Transmission lubricating oil is applied between each pair of elastic limiting plates.

[0009] The elastic limiting plate is a variable cross-section structure.

[0010] The middle section of the elastic limiting plate is rectangular, and the two ends are circular.

[0011] The radial through groove can be opened at any position on the shift fork shaft.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects: (I) The shift limit device for AMT transmission proposed in this utility model uses an elastic limit plate. The shift fork shaft impacts the elastic limit plate, and the deformation of the elastic limit plate delays the impact time, which greatly reduces the impact noise and vibration generated when the shift reaches the limit position after the shift is completed.

[0013] (II) The shift limit device for AMT transmission proposed in this utility model has a relatively low sound due to the elastic limit plate and shift fork shaft being located inside the AMT transmission, which improves the overall vehicle shift NVH.

[0014] (III) The use of through-hole pins in the shift limit device for AMT transmission proposed in this utility model improves the casting processability of AMT transmission housing and blocks the transmission of impact noise.

[0015] (IV) The shift limit device for AMT transmission proposed in this utility model improves the product assembly process compared with the prior art. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the shift limit device used in an AMT transmission.

[0017] The meanings of the labels in the diagram are as follows: 1-AMT transmission housing, 2-shift fork shaft, 3-radial through groove, 4-elastic limiting plate, 5-bolt hole, 6-bolt.

[0018] 101 - Mounting hole for the shift fork shaft; 102 - Through-hole pin.

[0019] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, all equipment and components in this utility model are based on equipment and components known in the prior art.

[0021] Following the above technical solution, the following are specific embodiments of the present utility model. It should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of the present utility model.

[0022] Example: This embodiment proposes a shift limiting device for an AMT transmission, such as... Figure 1 As shown, the system includes an AMT transmission housing 1, which has an axially penetrating shift fork shaft mounting hole 101. A shift fork shaft 2 is movably mounted in the shift fork shaft mounting hole 101. A radially penetrating groove 3 is provided on the shift fork shaft 2. Two radially symmetrical through-hole pins 102 are also provided on the AMT transmission housing 1. The shift fork shaft mounting hole 101 is located between the two through-hole pins 102.

[0023] like Figure 1 As shown, an elastic limiting plate 4 is radially movably installed in the radial through groove 3. Bolt holes 5 are provided at both ends of the elastic limiting plate 4. The bolt holes 5 correspond to the through pins 102. Bolts 6 are installed in the bolt holes 5 and the through pins 102 to fix the elastic limiting plate 4 to the AMT transmission housing 1.

[0024] As a preferred embodiment, the number of elastic limiting plates 4 is multiple, which can further improve the strength of the elastic limiting plates 4 and improve the reliability of the limiting.

[0025] As a preferred embodiment, the multi-piece elastic limiting plate 4 has gaps between it, and transmission lubricating oil is applied between every two elastic limiting plates 4, which can reduce and block noise transmission.

[0026] As a preferred embodiment, the elastic limiting plate 4 has a variable cross-section structure. The variable cross-section structure can optimize the elastic performance of the elastic limiting plate 4, prolong the impact time, and reduce impact noise.

[0027] As a preferred embodiment, the middle section of the elastic limiting plate 4 is rectangular, and the two ends are circular.

[0028] In this embodiment, the through-hole pin 102 is preferably pre-cast directly on the AMT transmission housing 1, reducing the number of parts and simplifying assembly.

[0029] In this embodiment, the radial through groove 3 can be opened at any position on the shift fork shaft 2, which simplifies assembly and improves the product assembly process.

[0030] The working process of the shift limit device for the AMT transmission in this embodiment is as follows: The shift fork shaft 2 moves axially within the shift fork shaft mounting hole 101, driving the shift fork to shift gears. After shifting gears, the shift fork shaft (the side wall of the radial through groove 3) impacts the elastic limiting plate 4 to limit the shift. Because the deformation of the elastic limiting plate 4 delays the impact time, it greatly reduces the impact noise and vibration generated when the shift reaches the limiting position after shifting gears.

Claims

1. A shift limiting device for an AMT transmission, comprising an AMT transmission housing (1), characterized in that, The AMT transmission housing (1) is provided with an axially through shift fork shaft mounting hole (101), and a shift fork shaft (2) is movably installed in the shift fork shaft mounting hole (101). A radial through groove (3) is provided on the shift fork shaft (2). Two through-hole pins (102) are also radially symmetrically arranged on the AMT transmission housing (1). The shift fork shaft mounting hole (101) is located between the two through-hole pins (102). An elastic limiting plate (4) is radially movably installed in the radial through groove (3). Bolt holes (5) are provided at both ends of the elastic limiting plate (4). The bolt holes (5) correspond to the through pins (102). Bolts (6) are installed in the bolt holes (5) and the through pins (102) to fix the elastic limiting plate (4) to the AMT transmission housing (1).

2. The shift limiting device for an AMT transmission as described in claim 1, characterized in that, The number of the elastic limiting plates (4) is one or more.

3. The shift limiting device for an AMT transmission as described in claim 2, characterized in that, Transmission lubricating oil is applied between each pair of elastic limiting plates (4).

4. The shift limiting device for an AMT transmission as described in claim 1, characterized in that, The elastic limiting plate (4) is a variable cross-section structure.

5. The shift limiting device for an AMT transmission as described in claim 1, characterized in that, The middle section of the elastic limiting plate (4) is rectangular, and the two ends are circular.

6. The shift limiting device for an AMT transmission as described in claim 1, characterized in that, The radial through groove (3) can be opened at any position on the fork shaft (2).

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