A magnet limit structure for a gear-engaging actuator

Abstract

The present invention relates to the field of mechanical technology, and in particular to a magnet limiting structure for a gear-engaging actuator, comprising: a fixing hole is arranged at the end of the gear-engaging piston shaft; a magnet seat comprises: a fixing part, the fixing part is fixed in the fixing hole; a magnet seat body, the magnet seat body is arranged at one end of the fixing part, and a limiting part is arranged on the side of the magnet seat body facing the gear-engaging piston shaft; a magnet is arranged at the limiting part, and forms an annular limiting structure with the limiting part; wherein the magnet limiting structure also comprises: a sealing ring is arranged between the gear-engaging piston shaft and the annular limiting structure. The beneficial effect is that: by arranging a sealing ring between the gear-engaging piston shaft and the annular limiting structure, the gap between the gear-engaging piston shaft and the magnet is filled; at the same time, after the sealing ring is compressed, its reaction force is applied to the magnet, thereby fixing the magnet, preventing the magnet from moving on the gear-engaging piston shaft, thereby ensuring the accuracy of the position, and realizing the basic function of the hydraulic system.

Description

Technical Field

[0001] The present invention relates to the field of mechanical technology, and in particular to a magnet limiting structure for a gear engaging actuator. Background Art

[0002] The gear selection and shifting actuator is a part of the hydraulic actuator used in the manual and automatic functions to realize the gear selection and shifting functions of the whole vehicle; during the gear shifting process, the gear shifting piston in the actuator valve body will move back and forth under the action of hydraulic pressure, realizing the action of shifting the odd gear on one side and the even gear on the other side; a Hall sensor will be installed on the valve body, and a magnet will be installed on the piston shaft. During the back and forth movement of the piston shaft, the magnet installed on the piston shaft will move with the piston shaft, and the position of the magnet will change accordingly. The sensor will identify the position change of the piston shaft through the change of the magnet position, and transmit this position signal to the TCU (Transmission Control Unit, automatic transmission control unit), so as to determine whether the piston shaft is engaged in each gear of the transmission to achieve accurate judgment; because the accuracy of this sensor is very high.

[0003] However, there is a gap in the installation of the magnet on the piston shaft in the existing design, which causes the movement of the magnet and the piston shaft to be out of sync. Since the position feedback requires very high precision, the inaccurate position caused by the clearance fit structure will cause the TCU to misjudge, and thus cannot reflect the actual position, resulting in gear shifting failure and the failure of the basic functions of the hydraulic mechanism. Summary of the invention

[0004] In view of the above problems in the prior art, a magnet limiting structure for a gear-engaging actuator is provided. By adding a sealing ring to fill the installation gap of the magnet on the piston shaft, the problems in the prior art can be solved. The specific technical solution is as follows:

[0005] A magnet limiting structure for a gear engaging actuator, the magnet limiting structure comprising:

[0006] A gear-engaging piston shaft, wherein a fixing hole is arranged at the end of the gear-engaging piston shaft;

[0007] A magnet base, the magnet base comprising:

[0008] a fixing portion, the fixing portion being fixed in the fixing hole;

[0009] A magnet seat body, the magnet seat body is arranged at one end of the fixing portion, and a limiting portion is arranged on a side of the magnet seat body facing the gear-engaging piston shaft;

[0010] a magnet, the magnet being disposed on the limiting portion and forming an annular limiting structure with the limiting portion;

[0011] Wherein, the magnet limiting structure also includes:

[0012] A sealing ring is sleeved between the gear shifting piston shaft and the annular limiting structure.

[0013] Preferably, the fixing portion matches the fixing hole.

[0014] Preferably, the sealing ring is an annular structure.

[0015] Preferably, the sealing ring is made of rubber.

[0016] Preferably, the thickness of the sealing ring matches the predetermined gap between the gear shifting piston shaft and the annular limiting structure.

[0017] Preferably, the magnet limiting structure further includes a Hall sensor, and the Hall sensor is arranged on the upper part of the magnet.

[0018] The beneficial effect is that a sealing ring is arranged between the gear-engaging piston shaft and the annular limiting structure to fill the gap between the gear-engaging piston shaft and the magnet; at the same time, after the sealing ring is compressed, its reaction force is applied to the magnet, thereby fixing the magnet and preventing the magnet from moving on the gear-engaging piston shaft, thereby ensuring the accuracy of the position and realizing the basic function of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the gear-engaging piston shaft and the magnet in the prior art;

[0020] Figure 2 A cross-sectional view of a magnet limiting structure for a gear engaging actuator according to the present invention;

[0021] Figure 3 It is an overall schematic diagram of a magnet limiting structure for a gear engaging actuator according to the present invention;

[0022] The gear engaging piston shaft 1; the fixing hole 11; the magnet seat 2; the fixing part 21; the magnet seat body 22; the limiting part 23; the magnet 3; the sealing ring 4; and the Hall sensor 5. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0026] In the prior art, such as Figure 1 As shown, after the magnet 3 is placed on the magnet seat 2, the magnet seat 2 will be pressed into the gear engaging piston shaft 1 by a press. The magnet seat 2 and the gear engaging piston shaft 1 are interference fit. Since the magnet 3 cannot withstand pressure, if it withstands pressure, it will cause the magnet 3 to break. In the existing technology, one side of the magnet seat 2 and the other side of the gear engaging piston shaft 1 are limited. When the limit surface is reached, the magnet seat 2 is installed. At this time, there will be a predetermined gap of 0.5 mm between the magnet 3 and the magnet seat 2. This will cause the magnet 3 to move on the gear engaging piston shaft 1, and the accuracy of the position cannot be guaranteed.

[0027] In view of the above problems in the prior art, a magnet limiting structure for a gear-engaging actuator is provided. By adding a sealing ring to fill the gap in the installation of the magnet on the piston shaft, the problems in the prior art can be solved. The specific technical solution is as follows:

[0028] A magnet limiting structure for a gear engaging actuator, the magnet limiting structure comprising:

[0029] A gear-engaging piston shaft 1, with a fixing hole 11 disposed at the end of the gear-engaging piston shaft 1;

[0030] A magnet base 2, the magnet base 2 comprises:

[0031] a fixing portion 21, the fixing portion 21 being fixed in the fixing hole 11;

[0032] A magnet seat body 22, the magnet seat body 22 is arranged at one end of the fixing portion 21, and a stopper 23 is arranged on a side of the magnet seat body 22 facing the gear-engaging piston shaft 1;

[0033] A magnet 3, which is disposed on the limiting portion 23 and forms an annular limiting structure with the limiting portion 23;

[0034] Among them, the magnet limiting structure also includes:

[0035] A sealing ring 4 is sleeved between the gear-engaging piston shaft 1 and the annular limiting structure.

[0036] Specifically, in this technical solution, if Figure 2As shown, based on the deficiencies in the prior art, improvements are made, the magnet 3 and the limiting portion 23 form an annular limiting structure, a sealing ring 4 is arranged between the gear engaging piston shaft 1 and the annular limiting structure, and the sealing ring 4 is sleeved between the gear engaging piston shaft 1 and the annular limiting structure, so that the pressure between the gear engaging piston shaft 1 and the magnet 3 can be buffered to prevent the magnet 3 from being damaged due to the pressure, and the sealing ring 4 can also be used to fill the gap in the installation of the magnet on the piston shaft, thereby ensuring the accuracy of the position and realizing the basic functions of the hydraulic system.

[0037] In a preferred embodiment, the fixing portion 21 matches the fixing hole 11 .

[0038] Specifically, in this technical solution, if Figure 2 As shown, a fixing hole 11 is provided in the middle of the gear-engaging piston shaft 1, and a fixing portion 21 in the magnet seat 2 is fixed in the fixing hole 11. The fixing portion 21 matches the fixing hole 11, which is an interference fit, so that the sealing performance of the fixing portion 21 and the fixing hole 11 can be improved. The interference fit ensures that the fixing portion 21 and the fixing hole 11 do not move.

[0039] In a preferred embodiment, the sealing ring 4 is an annular structure.

[0040] In a preferred embodiment, the sealing ring 4 is made of rubber.

[0041] Specifically, in this technical solution, if Figure 2 As shown, the sealing ring 4 is set as an annular structure and is sleeved between the gear engaging piston shaft 1 and the annular limiting structure, so that the magnet 3 can be restricted to one end close to the magnet seat 2 without displacement and gap, thereby realizing the correct reading of the gear engaging position, and at the same time, it can buffer the pressure between the gear engaging piston shaft 1 and the magnet 3 to prevent the magnet 3 from being damaged due to the pressure.

[0042] Further, the material of the sealing ring 4 is rubber material, and rubber is a high-elastic polymer compound, has good flex fatigue resistance, good wear resistance and cold resistance, and has good air tightness and waterproofness. The sealing ring 4 made of rubber is economical and practical.

[0043] In a preferred embodiment, the thickness of the sealing ring 4 matches the predetermined gap between the gear shifting piston shaft 1 and the annular limiting structure.

[0044] Specifically, in this technical solution, Figure 2As shown, the magnet 3 and the limiting portion 23 form an annular limiting structure. There is a predetermined gap of 0.5 mm between the gear engaging piston shaft 1 and the annular limiting structure. The sealing ring 4 is sleeved between the gear engaging piston shaft 1 and the annular limiting structure to fill the predetermined gap of 0.5 mm. Therefore, the thickness of the sealing ring 4 must match the predetermined gap between the gear engaging piston shaft 1 and the annular limiting structure, and the magnet 3 is limited by the elastic force of the sealing ring 4.

[0045] In a preferred embodiment, the magnet limiting structure further includes a Hall sensor 5 , and the Hall sensor 5 is arranged on the upper part of the magnet 3 .

[0046] Specifically, in this technical solution, if Figure 3 As shown, a Hall sensor 5 is arranged on the upper part of the magnet 3, because this design is to sense the position of the magnet 3 through the Hall sensor 5, and then determine the gear position, so that the basic function of the hydraulic system can be realized.

[0047] The beneficial effect is that a sealing ring is arranged between the gear-engaging piston shaft and the annular limiting structure to fill the gap between the gear-engaging piston shaft and the magnet; at the same time, after the sealing ring is compressed, its reaction force is applied to the magnet, thereby fixing the magnet and preventing the magnet from moving on the gear-engaging piston shaft, thereby ensuring the accuracy of the position and realizing the basic function of the hydraulic system.

[0048] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnet limiting structure for a gear engaging actuator, the magnet limiting structure comprising: A gear-engaging piston shaft, wherein a fixing hole is arranged at the end of the gear-engaging piston shaft; A magnet base, the magnet base comprising: a fixing portion, the fixing portion being fixed in the fixing hole; A magnet seat body, the magnet seat body is arranged at one end of the fixing portion, and a limiting portion is arranged on a side of the magnet seat body facing the gear-engaging piston shaft; a magnet, the magnet being disposed on the limiting portion and forming an annular limiting structure with the limiting portion; Characterized in that, the magnet limiting structure also includes: a sealing ring, the sealing ring being sleeved between the gear-engaging piston shaft and the annular limiting structure to buffer the pressure between the gear-engaging piston shaft and the magnet; The thickness of the sealing ring matches the predetermined gap between the gear-engaging piston shaft and the annular limiting structure; The predetermined gap is 0.5 mm.

2. According to claim 1, a magnet limiting structure for a gear engaging actuator is characterized in that: The fixing portion matches the fixing hole.

3. The magnet limiting structure for a gear engaging actuator according to claim 1, characterized in that: The sealing ring is an annular structure.

4. The magnet limiting structure for a gear engaging actuator according to claim 1, characterized in that: The sealing ring is made of rubber.

5. The magnet limiting structure for a gear engaging actuator according to claim 1, characterized in that: The magnet limiting structure also includes a Hall sensor, which is arranged on the upper part of the magnet to determine the position of the gear-engaging piston shaft by sensing the position of the magnet.

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