Gear selecting mechanism with oil seal

Abstract

The gear selecting mechanism with the oil seal solves the technical problems that an existing gear selecting mechanism of a gearbox is prone to rusting and clamping stagnation, and the gear selecting mechanism of the gearbox is complex in structure and inconvenient to assemble and disassemble when adopting a waterproof structure. According to the utility model, the design is carried out from five aspects of preventing the exposed metal part from rusting, preventing the exposed metal part from being directly matched and contacted, reducing the number of parts and reducing the cost, the oil seal is used for preventing water from entering the gear-selecting shaft hole of the window cover, and the clamping stagnation or the gear-selecting difficulty caused by rusting at the shaft / hole matching part is avoided; the dust cover is used for preventing dust and large-particle impurities in air or water from being accumulated, so that the oil seal is protected; the clamping spring is used for ensuring reliable connection and flexible and light rotation of the gear selecting shaft; adjustment is carried out on an original gear selecting mechanism, main body parts are mutually used, the types of new parts are reduced, and the production cost is controlled.

Description

Technical Field

[0001] The utility model relates to a gear selection mechanism of a gearbox, in particular to a gear selection mechanism with an oil seal. Background Art

[0002] The gear selection mechanism of the gearbox is used to change the gear position of the car. It is an important part of the car transmission system and can optimize the power output of the engine and improve fuel economy. Figure 1 The existing gear selection mechanism comprises a gear selection shaft (01), a dust cover (02), a window cover (04), a gear selection dial head (05) which are sequentially mounted on the gear selection shaft (01) from top to bottom, and a flat key (07) embedded between the gear selection shaft (01) and the gear selection dial head (05); the gear selection shaft (01) can rotate in the circumferential direction, and its bottom end is used to be installed at the bottom of the gearbox through bolts to limit the axial position of the gear selection shaft (01), and its upper part is provided with a convex ring and the window cover ( 04); the dust cover (02) is used to prevent dust and prevent large particles of impurities from entering the gap of the device; the window cover (04) is used to be fixed on the gearbox to limit the radial displacement and axial displacement of the gear selection shaft (01), and a sealing ring is provided between the window cover (04) and the gear selection shaft (01); the flat key (07) fixes the gear selection dial head (05) on the gear selection shaft (01); the gear selection dial head (05) and the flat key (07) can rotate with the gear selection shaft (01).

[0003] With the development of modern society, people pay more and more attention to environmental protection. In the process of engineering construction, in order to reduce the pollution of urban roads and air caused by dust generated by construction, people have taken a series of environmental protection measures, including regular spraying and dust reduction treatment of engineering vehicles. However, in the process of long-term and repeated passing through puddles and spray channels, the gear selection mechanism of engineering vehicles will corrode and rust due to frequent contact with water, which will lead to the problem of gear selection jamming, and in severe cases, it will even affect driving safety.

[0004] In order to solve the problem of rust and jamming of the gear selection mechanism of the gearbox due to water ingress, a Chinese patent with announcement number CN217177367U discloses a dustproof and waterproof gear selection structure, including a gear selection joint, a dust cover and a window cover; a first annular groove is provided on the gear selection joint, the window cover is fixedly connected to the cylindrical boss below the first annular groove, an oil seal is provided between one end of the inner wall of the window cover close to the cylindrical boss and the gear selection joint, and the other end of the inner wall of the window cover is fixedly connected to the gear selection joint; an annular boss is provided above the window cover, and a second annular groove is provided on the outer wall surface of the annular boss; the dust cover is located on the first annular groove and the second annular groove, and the dust cover is fixed by the first annular groove and the second annular groove.

[0005] The Chinese patent with the announcement number CN216478849U discloses a gear selection device with waterproof function, including a gear selection shaft unit and an operating shell; the gear selection shaft unit includes a gear selection shaft, an O-ring, a gear selection dial head, an operating window cover, a small gasket, an elastic retaining ring and a dustproof and waterproof cover; a first annular groove and a second annular groove are opened along the circumference of the gear selection shaft; the O-ring is assembled in the second annular groove of the gear selection shaft, and the gear selection dial head is welded to one end of the gear selection shaft to form a gear selection shaft assembly; a circular boss is provided on the upper surface of the operating window cover, and a through hole is opened along the axial center of the operating window cover; the gear selection shaft assembly is installed in the through hole of the operating window cover, and the gear selection dial head is The top is in contact with the first bottom end face of the operating window cover; the small washer is located on the upper end face of the circular boss of the operating window cover and the inner wall of the small washer is in close contact with the gear selection shaft; the elastic retaining ring is sleeved in the first annular groove of the gear selection shaft and fits with the upper surface of the small washer to axially position the gear selection shaft; the dustproof and waterproof cover is a cover body with a central opening, and the shape of the opening is adapted to the shape of the end face of the other end of the gear selection shaft; the dustproof and waterproof cover is sleeved on the gear selection shaft, and the opening is interference fit with the gear selection shaft, and at the same time, the lower surface of the dustproof and waterproof cover is in close contact with the step surface of the gear selection shaft; the second bottom end face of the operating window cover is in contact with the upper end face of the operating shell, so as to realize the assembly of the gear selection shaft unit and the operating shell.

[0006] Of the two technical solutions mentioned above, the former has a longer service life and the latter has a lower processing cost, but both require changing the basic design of the gear selection structure, increasing the types of parts of the gear selection mechanism, complicating the structure and manufacturing, and making installation and disassembly more complicated. Utility Model Content

[0007] The utility model aims to solve the technical problems that the existing gearbox selection mechanism is easy to rust and get stuck, or the types of parts of the gear selection mechanism are increased, making the structure and manufacturing complicated and the installation and disassembly inconvenient, and to provide a gear selection mechanism with an oil seal.

[0008] The inventive concept of the utility model is: to design from five aspects: to avoid rust of exposed metal parts, to avoid direct mating and contact of exposed metal parts, to reduce the number of parts, and to reduce costs, so as to avoid jamming or difficulty in gear selection due to rust at the shaft / hole mating part, to prevent accumulation of dust and large particles in the air or water, to ensure reliable connection of the gear selection shaft and flexible and easy rotation; to modify the original gear selection mechanism, to use the main parts interchangeably, and to control production costs.

[0009] In order to achieve the above purpose and complete the above concept, the technical solutions provided by the utility model are as follows:

[0010] A gear selection mechanism with an oil seal comprises a gear selection shaft, a window cover and a gear selection dial head which are sequentially mounted on the gear selection shaft from top to bottom, and a flat key embedded between the gear selection shaft and the gear selection dial head;

[0011] The outer diameters of the various parts of the gear selector shaft are respectively matched with the inner diameters of the window cover and the gear selector knob at the corresponding positions;

[0012] The gear selection shaft can rotate in the circumferential direction, and its bottom end is used to cooperate with the bottom of the gearbox to limit the axial position of the gear selection shaft;

[0013] The window cover is used to be fixed on the gearbox, and a fixing convex cylinder extending downward along the outer surface of the gear selection shaft is provided on the outer periphery of the inner hole of the window cover, and the fixing convex cylinder is sleeved on the gear selection shaft and limits its radial displacement;

[0014] The flat key fixes the gear selector knob to the gear selector shaft;

[0015] The gear selector knob and flat key can rotate along with the gear selector shaft;

[0016] Its special features are:

[0017] It includes an oil seal area, an axial limit area and a clamping area arranged from top to bottom;

[0018] The structure of the oil seal area is:

[0019] A limiting convex ring coaxial with the inner hole is provided on the top of the window cover, a gap is provided between the limiting convex ring and the gear selection shaft, and an oil seal is provided in the gap to achieve sealing and prevent the exposed metal parts from rusting;

[0020] The structure of the axial limit zone is:

[0021] A limiting ring groove is provided on the side wall of the inner hole of the window cover, and a ring platform is provided on the gear selection shaft to match the groove, which is used to limit the axial position of the gear selection shaft and realize the downward movement of the limiting structure to avoid direct contact between the exposed metal parts.

[0022] The structure of the card installation area is:

[0023] A retaining spring is provided at the bottom end of the gear selection shaft, and the upper side of the retaining spring abuts against the lower end of the gear selection dial head to limit the axial position of the gear selection shaft, thereby simplifying the structure and facilitating loading and unloading.

[0024] Furthermore, it also includes a dust cover fixedly sleeved on the upper part of the gear selection shaft, the dust cover is located above the window cover and is installed on the limiting convex ring.

[0025] Furthermore, the gear selection shaft includes a connecting section, a sealing section, a limiting section and a gear selection section arranged from top to bottom;

[0026] The outer diameters of the connecting section, sealing section and limiting section increase from top to bottom, and the diameter of the gear selection section is equal to the diameter of the sealing section;

[0027] A connecting groove for connecting an external gear selection operating device is provided at the top of the connecting section, the outer diameter of the connecting section matches the inner diameter of the dust cover, and the dust cover abuts against a boss formed by the diameter difference between the connecting section and the sealing section;

[0028] The sealing section cooperates with the oil seal, and the oil seal is arranged between the limiting convex ring and the sealing section;

[0029] The limiting section is composed of a ring platform, and the limiting section cooperates with the limiting ring groove;

[0030] The gear selection section cooperates with the fixed convex cylinder and the gear selection shift head, and the retaining spring is arranged at the lower part of the gear selection section.

[0031] Furthermore, the bottom surface of the gap between the limiting convex ring and the gear selection shaft is lower than the upper surface of the window cover.

[0032] Furthermore, the outer circumferential bottom end of the limiting convex ring is an arc transition.

[0033] Furthermore, the top end of the limiting convex ring is an arc transition.

[0034] Compared with the prior art, the utility model has the following beneficial effects:

[0035] 1. The utility model discloses a gear selection mechanism with an oil seal, which adopts the design of the oil seal area. By arranging the oil seal between the limit convex ring and the gear selection shaft, the gear selection part of the transmission is sealed under the condition of repeated wading, thereby avoiding rusting of exposed metal parts.

[0036] 2. The utility model provides a gear selection mechanism with an oil seal, which adopts the design of an axial limit zone. The limit ring groove and the ring table cooperate with each other to achieve the downward movement of the limit structure of the gear selection shaft, thereby avoiding direct contact with exposed metal parts and arranging the limit structure below the oil seal.

[0037] 3. The utility model provides a gear selection mechanism with an oil seal, which adopts a clamping area design and fixes the lower end of the gear selection shaft by a clamping spring, thereby ensuring reliable connection of the gear selection shaft and flexible and light rotation.

[0038] 4. The utility model provides a gear selection mechanism with an oil seal, which is modified on the original gear selection mechanism. The main parts are common with existing products, which reduces the types of new parts and reduces the production cost.

[0039] 5. The utility model provides a gear selection mechanism with an oil seal, which has a simple structure and is convenient to install and disassemble, and does not require auxiliary tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of an existing gear selection mechanism.

[0041] Figure 1 The reference numerals are as follows: 01 - gear selection shaft; 02 - dust cover; 04 - window cover; 05 - gear selection dial head; 07 - flat key.

[0042] Figure 2It is a structural schematic diagram of an embodiment of a gear selection mechanism with an oil seal of the utility model;

[0043] Figure 3 It is a schematic diagram of the positions of the oil seal area, the axial limit area and the clamping area in the embodiment of the utility model;

[0044] Figure 4 It is a structural schematic diagram of the gear selection shaft in an embodiment of the utility model;

[0045] Figure 5 It is a three-dimensional structural diagram of the gear selection shaft in the embodiment of the utility model;

[0046] Figure 6 It is a structural schematic diagram of a window cover in an embodiment of the utility model;

[0047] Figure 7 It is a three-dimensional structural diagram of the window cover in the embodiment of the utility model.

[0048] Figure 2-7 The reference numerals in the accompanying drawings are as follows: 1-shift shaft, 101-ring platform; 2-dust cover; 3-oil seal; 4-window cover, 401-limiting convex ring, 402-limiting ring groove, 403-fixing convex cylinder; 5-shift selector head; 6-circlip; 7-flat key;

[0049] 11-connecting section, 12-sealing section, 13-limiting section, 14-gear selection section;

[0050] A-Oil seal area; B-Axial limit area; C-Mounting area. DETAILED DESCRIPTION

[0051] The specific technical solutions in the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0052] See also Figure 2-Figure 3 , a gear selection mechanism with oil seal, which is directly modified on the original gear selection mechanism, and the main parts are interchangeable, which reduces the types of new parts and controls the production cost;

[0053] It comprises a gear selection shaft 1, a dust cover 2, a window cover 4, a gear selection dial head 5, which are sequentially mounted on the gear selection shaft 1 from top to bottom, and a flat key 7 embedded between the gear selection shaft 1 and the gear selection dial head 5;

[0054] The outer diameters of the various parts of the gear selector shaft 1 are respectively matched with the inner diameters of the dust cover 2, the window cover 4 and the gear selector knob 5 at the corresponding positions;

[0055] The gear selection shaft 1 can rotate in the circumferential direction, and its bottom end is used to cooperate with the bottom of the gearbox to limit the axial position of the gear selection shaft 1;

[0056] The window cover 4 is used to be fixed on the gearbox, and a fixing convex cylinder 403 extending downward along the outer surface of the gear selection shaft 1 is provided at the outer periphery of the inner hole of the window cover 4. The fixing convex cylinder 403 is sleeved on the gear selection shaft 1 and limits its radial displacement;

[0057] The flat key 7 fixes the gear selector 5 on the gear selector shaft 1;

[0058] The gear selector 5 and the flat key 7 can rotate along with the gear selector shaft 1;

[0059] See also Figure 4-Figure 5 The gear selection shaft 1 includes a connecting section 11, a sealing section 12, a limiting section 13 and a gear selection section 14 arranged from top to bottom;

[0060] The outer diameters of the connecting section 11, the sealing section 12, and the limiting section 13 increase from top to bottom, and the diameter of the gear selection section 14 is equal to the diameter of the sealing section 12;

[0061] A connecting groove for connecting an external gear selection operating device is provided at the top of the connecting section 11. The outer diameter of the connecting section 11 matches the inner diameter of the dust cover 2. The dust cover 2 abuts against a boss formed by the diameter difference between the connecting section 11 and the sealing section 12.

[0062] The sealing section 12 cooperates with the oil seal 3, and the oil seal 3 is arranged between the limiting convex ring 401 and the sealing section 12;

[0063] The limiting section 13 is composed of a ring platform 101, and the limiting section 13 cooperates with the limiting ring groove 402;

[0064] The gear selection section 14 cooperates with the fixed convex cylinder 403 and the gear selection shift head 5, and the retaining spring 6 is arranged at the lower part of the gear selection section 14;

[0065] The bottom surface of the gap between the limiting convex ring 401 and the gear selection shaft 1 is lower than the upper surface of the window cover 4;

[0066] The bottom end of the outer periphery of the limiting convex ring 401 is a circular arc transition, and the top end of the limiting convex ring 401 is a circular arc transition.

[0067] Combination Figure 3-Figure 7 In the gear selection mechanism provided in this embodiment, the oil sealing area A, the axial limiting area B and the clamping area C are arranged from top to bottom;

[0068] The specific structure of oil seal area A is:

[0069] A limiting convex ring 401 coaxial with the inner hole is provided on the top of the window cover 4, a gap is provided between the limiting convex ring 401 and the gear selection shaft 1, and an oil seal 3 is provided in the gap;

[0070] The outer diameter of the dust cover 2 is larger than the outer diameter of the limiting protruding ring 401, and the lower end thereof is lower than the top position of the limiting protruding ring 401;

[0071] The specific structure of the axial limit zone B is:

[0072] A limiting ring groove 402 is provided on the inner hole side wall of the window cover 4, and the gear selection shaft 1 is provided with a ring platform 101 matched therewith, which is used to limit the axial position of the gear selection shaft 1;

[0073] The specific structure of the card installation area C is:

[0074] A retaining spring 6 is provided at the bottom end of the gear selection shaft 1 , and the upper side of the retaining spring 6 abuts against the lower end of the gear selection dial head 5 to limit the axial position of the gear selection shaft 1 .

[0075] In the gear selection mechanism provided in this embodiment, an oil seal 3 is used to prevent water from entering the connecting hole between the window cover 4 and the gear selection shaft 1, thereby avoiding jamming or difficulty in gear selection due to rust at the shaft / hole fitting; a dust cover 2 is used to prevent dust and large particles in the air or water from accumulating, thereby effectively protecting the oil seal 3; a retaining spring 6 is used to ensure that the entire gear selection mechanism is reliably connected and that the gear selection shaft 1 is flexible and easy to rotate.

[0076] In the gear selection mechanism provided in this embodiment, through the design at A, B, and C, firstly, it can meet the realization of the gear selection function of the gearbox under repeated wading conditions; secondly, it is convenient for installation and disassembly, and does not require other auxiliary tooling; finally, it can also achieve the commonality of major parts with existing products, and the optimization of structure can reduce the number of parts and reduce production costs.

[0077] The above description is only an embodiment of the present utility model and is not intended to limit the protection scope of the present utility model. Any equivalent structural transformation made using the contents of the present utility model specification and drawings, or directly or indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A gear selection mechanism with an oil seal, comprising a gear selection shaft (1), a window cover (4) sequentially mounted on the gear selection shaft (1) from top to bottom, a gear selection dial head (5), and a flat key (7) embedded between the gear selection shaft (1) and the gear selection dial head (5); The outer diameters of various parts of the gear selection shaft (1) are respectively matched with the inner diameters of the window cover (4) and the gear selection dial head (5) at corresponding positions; the gear selection shaft (1) can rotate in the circumferential direction, and its bottom end is used to cooperate with the bottom of the gearbox to limit the axial position of the gear selection shaft (1); the window cover (4) is used to be fixed on the gearbox, and a fixing convex cylinder (403) extending downward along the outer surface of the gear selection shaft (1) is provided on the outer periphery of its inner hole, and the fixing convex cylinder (403) is sleeved on the gear selection shaft (1) and limits its radial displacement; the flat key (7) fixes the gear selection dial head (5) on the gear selection shaft (1); the gear selection dial head (5) and the flat key (7) can rotate along with the gear selection shaft (1); Features: It includes an oil seal area (A), an axial limit area (B) and a clamping area (C) arranged from top to bottom; The structure of the oil seal area (A) is as follows: a limiting convex ring (401) coaxial with the inner hole is provided on the top of the window cover (4), a gap is provided between the limiting convex ring (401) and the gear selection shaft (1), and an oil seal (3) is provided in the gap; The structure of the axial limiting area (B) is as follows: a limiting ring groove (402) is provided on the inner hole side wall of the window cover (4), and the gear selection shaft (1) is provided with a ring platform (101) matched therewith, which is used to limit the axial position of the gear selection shaft (1); The structure of the clamping area (C) is as follows: a clamping spring (6) is provided at the bottom end of the gear selection shaft (1), and the upper side of the clamping spring (6) abuts against the lower end of the gear selection dial head (5) to limit the axial position of the gear selection shaft (1).

2. A gear selection mechanism with an oil seal according to claim 1, characterized in that: It also includes a dust cover (2) fixedly sleeved on the upper part of the gear selection shaft (1); the dust cover (2) is located above the window cover (4) and is installed on the limiting convex ring (401).

3. A gear selection mechanism with an oil seal according to claim 2, characterized in that: The gear selection shaft (1) comprises a connecting section (11), a sealing section (12), a limiting section (13) and a gear selection section (14) arranged from top to bottom; The outer diameters of the connecting section (11), the sealing section (12) and the limiting section (13) increase in sequence from top to bottom, and the diameter of the gear selection section (14) is equal to the diameter of the sealing section (12); The top of the connecting section (11) is provided with a connecting groove for connecting an external gear selection operating device, the outer diameter of the connecting section (11) matches the inner diameter of the dust cover (2), and the dust cover (2) abuts against a boss formed by the diameter difference between the connecting section (11) and the sealing section (12); The sealing section (12) cooperates with the oil seal (3), and the oil seal (3) is arranged between the limiting convex ring (401) and the sealing section (12); The limiting section (13) is composed of the annular platform (101), and the limiting section (13) cooperates with the limiting annular groove (402); The gear selection section (14) cooperates with the fixed convex cylinder (403) and the gear selection shift head (5), and the retaining spring (6) is arranged at the lower part of the gear selection section (14).

4. A gear selection mechanism with an oil seal according to claim 3, characterized in that: The bottom surface of the gap between the limiting convex ring (401) and the gear selection shaft (1) is lower than the upper surface of the window cover (4).

5. A gear selection mechanism with an oil seal according to claim 4, characterized in that: The bottom end of the outer circumference of the limiting convex ring (401) is in the form of an arc transition.

6. A gear selection mechanism with an oil seal according to claim 5, characterized in that: The top end of the limiting convex ring (401) is an arc transition.

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