A shaft hole fitting structure

Abstract

This utility model relates to a shaft-hole mating structure, including a rocker arm with sleeves on both sides; it also includes a housing with a shaft hole inside; the sleeves have an opening groove around their periphery, and their front ends are interference-fitted with the shaft hole. The opening groove makes the sleeve form an elastic arm for adaptively compensating for the deformation of the rocker arm. Using the above-mentioned technical solution, this utility model designs a 30-degree opening groove around the sleeve for deformation, and then uses the interference fit between the front end of the sleeve and the shaft hole. When the sleeve is installed, it automatically clamps the rocker arm. The slotted sleeve forms an elastic arm, so even if the rocker arm shaft of the machined part deforms, it can be retracted or expanded by the sleeve, and the interference fit with the shaft hole ensures that the sleeve and rocker arm are mated without looseness and move flexibly. This solves the problem that existing sleeves and rocker arms are rigid structures with a large surface fit with the shaft hole, which easily leads to excessive clearance and loosening, or jamming due to stress concentration during assembly.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive shifting mechanisms, and specifically designs a shaft-hole mating structure. Background Technology

[0002] In a car's transmission system, the gear shifting mechanism is a key component for power transmission and speed regulation. Its performance greatly affects vehicle handling, fuel economy, and driving experience. It mainly consists of a gear shift lever, a gear shift actuator, and related mechanical transmission components. It is a device that can change the gears of a car. In a manual transmission car, the driver operates the gear shift lever to switch different gear combinations, thereby changing the transmission ratio. In an automatic transmission car, the gear shifting mechanism automatically switches gears based on parameters such as vehicle speed and engine load.

[0003] Shaft-hole fit is a common structural design in automotive gear shifters. Existing shift mechanisms require shifting gears by moving a lever. To ensure the stability of the lever during movement, a sleeve located in the middle of the lever is usually inserted into the shaft hole. When the lever is moved, the sleeve and the shaft hole mutually limit each other, causing the lever to rotate around the sleeve, thereby causing the lower part of the lever to swing and shift gears. However, existing sleeves and levers are rigid structures with a large-area fit with the shaft hole. Rigid structures lack buffering and adjustment capabilities. When there are machining errors in the components or wear due to long-term use, the fit clearance is prone to become too large and loose, or the assembly stress concentration may cause jamming. Therefore, we provide a shaft-hole fit structure. Summary of the Invention

[0004] The purpose of this utility model is to overcome the defects of the prior art by providing a shaft-hole mating structure, which solves the problem of easy loosening or jamming of the sleeve and rocker arm in the shaft-hole mating structure.

[0005] The technical solution of this utility model includes a swing arm, with sleeves provided on both sides of the swing arm; it also includes a housing, with a shaft hole inside the housing; the sleeves have an opening groove around their periphery, and their front ends are interference-fitted with the shaft hole, the opening grooves making the sleeves form an elastic arm for adaptively compensating for the deformation of the swing arm.

[0006] Using the above technical solution, the rocker arm has integrally formed shafts on both sides of the middle section, which are inserted into the sleeve to support the sleeve and facilitate the rotation of the rocker arm in the sleeve position. There are two outer shells, which are fixed together by bolts to form an internal cavity to protect the internal structure. The inclination of the opening groove is degrees. When the sleeve is inserted into the shaft hole by deforming through the opening groove, the front end of the sleeve is interference-fitted with the shaft hole, which automatically clamps the shaft on the rocker arm. The groove of the sleeve forms an elastic arm. Even if the rocker arm shaft is deformed, it can be closed or opened by the sleeve to interference-fit with the shaft hole. Through the above design, the sleeve and shaft are in contact without loosening and move flexibly, while reducing the manufacturing precision requirements.

[0007] A further feature of this invention is that the lower part of the lever has a hollow interior and a buffer reset mechanism inside, which increases the push feel of the lever during operation.

[0008] With the above-mentioned further settings, the lever's feel during gear shifting is improved through a buffer reset mechanism.

[0009] A further feature of this invention is that the buffer reset mechanism includes a base, which is fixedly installed on the inner bottom wall of the outer casing, and the upper surface of the base is recessed inward.

[0010] With the above-mentioned further configuration, during use, the swing arm is turned at the top, the swing arm rotates, the swing arm drives the extrusion cylinder to swing, so that the bottom of the extrusion cylinder slides on the base, and the base provides a certain resistance to the extrusion cylinder when it slides.

[0011] A further improvement of this invention: the upper surface of the base contacts a compression cylinder, the compression cylinder is located inside the swing arm and can slide up and down, the inside of the compression cylinder is hollow, and a spring is fixedly installed on the inner bottom wall of the compression cylinder, the upper end of the spring being fixedly connected to the inner wall of the swing arm.

[0012] With the above-mentioned further configuration, the spring continuously provides squeezing force, and the squeezing cylinder can slide inside the rocker arm to achieve different resistance sensations.

[0013] A further improvement of this invention is that the swing arm has four fixing holes on its exterior.

[0014] With the above-mentioned further design, the fixing holes are used to install the entire structure onto the vehicle for fixed support.

[0015] A further feature of this invention is that a support plate is mounted on the outer surface of the swing arm, a bushing is provided above the support plate, and the lower surface of the bushing is connected to the outer shell.

[0016] With the above-mentioned further configuration, a support plate is used to support the bushing, which can cover the gap between the swing arm and the housing to increase aesthetics.

[0017] This shaft-hole mating structure incorporates components such as a sleeve and an open slot. The sleeve has a 30-degree open slot around its perimeter for deformation. The sleeve's front end is then pressurized against the shaft hole. When the sleeve is inserted, it automatically clamps the rocker arm. The slot in the sleeve forms an elastic arm, allowing the rocker arm to be retracted or expanded by the sleeve even if the rocker arm shaft deforms, maintaining the pressurized fit with the shaft hole. This design ensures that the sleeve and rocker arm fit together smoothly and without loosening, while also reducing manufacturing precision requirements. This solves the problems of existing rigid structures where both the sleeve and rocker arm have a large surface fit with the shaft hole, leading to excessive clearance and loosening, or jamming due to stress concentration during assembly. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the present utility model;

[0019] Figure 2 This is an exploded view of the outer shell of a specific embodiment of the present utility model;

[0020] Figure 3 This is a three-dimensional structural diagram of the shaft hole according to a specific embodiment of the present utility model;

[0021] Figure 4 This is an exploded view of the sleeve according to a specific embodiment of the present utility model;

[0022] Figure 5 This is an exploded view of the buffer reset mechanism according to a specific embodiment of the present invention;

[0023] Figure 6 This is a three-dimensional structural diagram of the sleeve according to a specific embodiment of the present utility model.

[0024] In the diagram: 1. Rocker arm; 2. Sleeve; 3. Outer shell; 4. Shaft hole; 5. Opening slot; 6. Buffer reset mechanism; 601. Base; 602. Extrusion cylinder; 603. Spring; 7. Fixing hole; 8. Support plate; 9. Bushing. Detailed Implementation

[0025] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] It should be noted that in the description of this utility model, all directional indicators (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0027] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] like Figure 1-6 As shown, a shaft-hole mating structure includes a rocker arm 1, with sleeves 2 on both sides of the rocker arm 1; it also includes a housing 3, with a shaft hole 4 inside the housing 3; the sleeves 2 have opening grooves 5 around their periphery, and their front ends are interference-fitted with the shaft hole 4. The opening grooves 5 make the sleeves 2 form elastic arms to adaptively compensate for the deformation of the rocker arm 1. Shafts are integrally formed on both sides of the rocker arm 1 at the middle, used to insert into the inside of the sleeves 2 to support the sleeves 2 and facilitate the rotation of the rocker arm 1 in the position of the sleeves 2. There are two housings 3. The shells 3 are fixed together with bolts to form an internal cavity to protect the internal structure. The inclination of the opening slot 5 is 30 degrees. When the sleeve 2 is inserted into the shaft hole 4 by deforming through the opening slot 5, the front end of the sleeve 2 is interference-fitted with the shaft hole 4, which automatically clamps the shaft on the rocker arm 1. The slot of the sleeve 2 forms an elastic arm. Even if the shaft of the rocker arm 1 is deformed, it can be closed or opened by the sleeve 2 to interference fit with the shaft hole 4. Through the above design, the sleeve 2 and the shaft are not loose and move flexibly when they are in contact, while reducing the manufacturing precision requirements.

[0030] The lower part of the lever 1 has a hollow interior and a buffer reset mechanism 6 inside. This mechanism enhances the feel of the lever during operation. The buffer reset mechanism 6 includes a base 601, which is fixedly installed on the inner bottom wall of the outer casing 3. The upper surface of the base 601 is recessed inward, and the upper surface of the base 601 contacts a compression cylinder 602. The compression cylinder 602 is located inside the lever 1 and can slide up and down. The interior of the compression cylinder 602 is hollow, and a spring 603 is fixedly installed on the inner bottom wall of the compression cylinder 602. The upper end of the spring 603 is fixedly connected to the inner wall of the lever 1. In use, the lever 1 is turned at the upper end, causing it to rotate. The lever 1 drives the compression cylinder 602 to swing, causing the bottom of the compression cylinder 602 to slide on the base 601. The base 601 provides resistance to the compression cylinder 602 during sliding, while the spring 603 continuously provides pressure, thereby increasing the feel of shifting gears.

[0031] The swing arm 1 has four fixing holes 7 on its exterior. The fixing holes 7 are used to install the structure onto the vehicle for fixation and support. A support plate 8 is installed on the outer surface of the swing arm 1. A bushing 9 is installed on the top of the support plate 8. The lower surface of the bushing 9 is connected to the outer shell 3. The support plate 8 is used to support the bushing 9. The bushing 9 can cover the gap between the swing arm 1 and the outer shell 3 to increase aesthetics.

[0032] In use, a 30-degree opening groove 5 is designed around the sleeve 2 for deformation. The front end of the sleeve 2 is then interference-fitted with the shaft hole 4. When the sleeve 2 is installed, it automatically clamps the rocker arm 1. The groove of the sleeve 2 forms an elastic arm. Even if the shaft of the rocker arm 1 is deformed, it can be closed or opened by the sleeve 2 and interference-fitted with the shaft hole 4. Through the above design, the sleeve 2 and the rocker arm 1 are not loose and move flexibly, while reducing the manufacturing precision requirements.

Claims

1. A shaft-hole fitting structure comprising a swing lever (1), characterized by: Both sides of the swing arm (1) are provided with sleeves (2); it also includes a housing (3), and the housing (3) has a shaft hole (4) inside; the sleeve (2) has an opening groove (5) around its periphery, and its front end is interference-fitted with the shaft hole (4). The opening groove (5) makes the sleeve (2) form an elastic arm, which is used to adaptively compensate for the deformation of the swing arm (1).

2. The shaft-hole mating structure according to claim 1, characterized in that: The lower part of the lever (1) is a hollow mechanism, and a buffer reset mechanism (6) is provided inside to increase the push feel of the lever during operation.

3. The shaft-hole mating structure according to claim 2, characterized in that: The buffer reset mechanism (6) includes a base (601), which is fixedly installed on the inner bottom wall of the outer shell (3), and the upper surface of the base (601) is recessed inward.

4. The shaft-hole mating structure according to claim 3, characterized in that: The upper surface of the base (601) is in contact with the extrusion cylinder (602). The extrusion cylinder (602) is located inside the swing arm (1) and can slide up and down. The inside of the extrusion cylinder (602) is hollow, and a spring (603) is fixedly installed on the inner bottom wall of the extrusion cylinder (602). The upper end of the spring (603) is fixedly connected to the inner wall of the swing arm (1).

5. The shaft-hole mating structure according to claim 1, characterized in that: The swing arm (1) has four fixing holes (7) on its exterior.

6. The shaft-hole mating structure according to claim 1, characterized in that: A support plate (8) is installed on the outer surface of the swing arm (1), and a bushing (9) is provided above the support plate (8). The lower surface of the bushing (9) is connected to the outer shell (3).

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