Transmission self-locking structure and gearbox

Abstract

The utility model discloses a transmission self-locking structure and a gearbox, and belongs to the field of transmissions. The transmission self-locking structure comprises a transmission shell and a shifting fork shaft, a self-locking hole is formed in the transmission shell and located above the shifting fork shaft, the transmission self-locking structure further comprises a guide top cover and a self-locking pin vertically arranged in the self-locking hole in a sliding mode, the self-locking pin is of a hollow structure, and a self-locking spring is inserted in the self-locking pin; the end, away from the self-locking pin, of the self-locking spring abuts against the guide top cover, a guide column is arranged on the guide top cover and inserted into the self-locking spring, and the side, away from the self-locking pin, of the guide top cover is used for abutting against an executing mechanism shell. According to the split type transmission self-locking structure, the self-locking spring is guided in the axial direction through the guide column, irregular movement such as deviation and inclination in the axial movement process of the self-locking spring is avoided, and the problem that according to an existing split type transmission self-locking structure, the stability of the spring in the axial movement process is poor is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of transmission, in particular to a transmission self-locking structure and gearbox. BACKGROUND

[0002] The shift spring positioning pin self-locking structure is used in heavy gearbox to ensure the accuracy and reliability of gear shifting, prevent misoperation and gear slipping, and improve driving safety and comfort. The shift spring positioning pin self-locking structure simplifies the operation of the driver, reduces wear and tear, and prolongs the service life of the gearbox through precise positioning and automatic locking function, and is suitable for various working conditions and high temperature environment, which is an important component to ensure the stable operation of the gearbox.

[0003] In order to simplify the self-locking structure and reduce the manufacturing and use cost of the self-locking structure, a split type self-locking structure (such as publication number CN213808822U) has appeared, which includes a plug, a compression spring and a top cap, a self-locking hole is formed on the housing of the transmission, and the top cap is slidably arranged in the self-locking hole. The plug is connected to the top end of the self-locking hole by threaded connection, and the compression spring is arranged between the plug and the top cap. The whole structure is easy to disassemble when installing, checking and replacing the compression spring or the top cap.

[0004] However, the existing split type transmission self-locking structure has the following problems: the spring is inserted into the self-locking hole of the housing, and since the inner diameter of the self-locking hole is larger than the outer diameter of the spring, the stability of the spring during axial movement is poor. When the shift fork shaft moves or rotates to shift gears, the vibration and impact force generated will cause the spring to deviate and tilt, reducing the accuracy of self-locking. Moreover, the deviation of the spring and the poor accuracy of self-locking will also increase the gear shifting resistance and deteriorate the operation experience. TECHNICAL FIELD

[0005] To solve the technical problems of the existing split type transmission self-locking structure, poor stability of the spring during axial movement, reduced self-locking accuracy and affected operation experience in the background art, the utility model provides a transmission self-locking structure.

[0006] The technical scheme of the utility model is as follows:

[0007] The utility model provides a kind of transmission self-locking structure, including transmission shell and fork shaft, transmission shell is equipped with self-locking hole, self-locking hole is located above fork shaft, further include: guide top cap and the self-locking pin vertically slidingly arranged in self-locking hole, self-locking pin is hollow structure, self-locking spring is inserted in self-locking pin;Self-locking spring is away from the end of self-locking pin and guide top cap abuts, guide top cap is equipped with guide column, guide column is inserted in self-locking spring, the side of guide top cap away from self-locking pin is used to abut with actuating mechanism shell, the axial direction of self-locking spring is guided using guide column, avoid self-locking spring axial movement process and appear irregular motion such as deviation, inclination, to make self-locking pin can be accurately inserted into the positioning locking groove on fork shaft, ensure that self-locking pin and the effective cooperation of positioning locking groove, reduce the influence to operation experience;By self-locking spring, guide top cap is applied counterforce, guide top cap is pressed on actuating mechanism shell, realize the fixation of self-locking structure overall position, without using thread connection etc.

[0008] Preferably, the guide top cap includes a base, the base is a plate structure, the guide column is a cylindrical structure, and the guide column is detachably installed at the center of the base. The detachable setting mode allows the guide column to be replaced individually without replacing the guide top cap as a whole, thereby reducing production cost and maintenance difficulty. Meanwhile, the detachable connection mode facilitates the assembly of the guide top cap and improves production efficiency.

[0009] Preferably, the diameter of the guide column is not greater than the inner diameter of the self-locking spring, so as to ensure that the guide column can be smoothly inserted into the self-locking spring, provide stable axial guidance for the self-locking spring, and will not have negative impact on the elasticity and stability of the spring.

[0010] Preferably, the self-locking pin includes a pin body, the pin body is a cylindrical structure, and an oil storage groove is formed in the pin body and penetrates the top end of the pin body. The self-locking spring is inserted into the oil storage groove for storage of lubricating oil, so as to ensure the lubrication requirement of the self-locking pin and the self-locking spring during reciprocating motion and reduce the abrasion between components. A head is fixedly arranged at the bottom end of the pin body, which can enhance the cooperation effect of the self-locking pin and the positioning locking groove, make the self-locking more reliable, and improve the stability during gear shifting of the transmission.

[0011] Preferably, the oil storage groove is coaxially arranged with the pin body, and the self-locking spring is gap-fitted with the oil storage groove. The coaxial arrangement ensures that the self-locking spring is uniformly stressed in the oil storage groove, avoids uneven stress caused by eccentric installation of the spring and affects the performance and service life of the spring. The gap-fitting enables the self-locking spring to freely stretch and contract in the oil storage groove and stably move axially under the guidance of the guide column, further ensures that the self-locking pin is accurately inserted into the positioning locking groove, and improves the working precision of the self-locking structure.

[0012] Preferably, the head is a hemispherical structure, and the head can play a good guiding role when being inserted into the positioning locking groove, so that the positioning locking groove is more easily aligned and positioned, and the insertion difficulty is reduced; meanwhile, the contact area of the hemispherical head with the positioning locking groove is relatively small, and a larger pressure can be generated under the same pressure, so that the self-locking effect is enhanced, and the reliability and stability of the transmission during gear shifting are improved.

[0013] Preferably, the positioning locking groove is arranged on the shift fork shaft, and the head is arranged in the positioning locking groove, so that the movement of the shift fork shaft can be effectively limited through the close cooperation of the head and the positioning locking groove, so that the automatic gear shifting of the shift fork shaft due to vibration and the like during vehicle driving is prevented, the selected gear of the transmission can be stably worked after being selected, and the safety and stability of vehicle driving are improved.

[0014] Preferably, the top end of the pin body is provided with an oil guide groove, the oil guide groove is coaxially arranged with the oil storage groove, the diameter of the oil guide groove is larger than that of the oil storage groove, and the oil guide groove facilitates the addition and replenishment of lubricating oil. During equipment maintenance, the lubricating oil can flow more smoothly into the oil storage groove through the oil guide groove, and the oiling convenience is improved; meanwhile, the oil guide groove with a larger diameter also facilitates the installation of the self-locking spring.

[0015] Preferably, the bottom end of the pin body is provided with a first chamfer portion, and the first chamfer portion is a circular chamfer structure; the top end of the pin body is provided with a second chamfer portion, and the second chamfer portion is a straight line chamfer structure, so that the self-locking pin can be installed in the self-locking hole, and the reciprocating sliding of the self-locking pin in the self-locking hole is facilitated.

[0016] The transmission comprises an actuator housing and a transmission self-locking structure, the actuator housing is provided with a mounting plane, the mounting plane is perpendicular to the axis of the self-locking hole, the base abuts against the mounting plane, the coaxiality of the guide column and the self-locking hole can be ensured after the guide top cover is installed in place, and interference between the guide column and the self-locking spring is avoided.

[0017] The above technical scheme can be seen, the advantages of the present application are as follows:

[0018] 1. The guide top cover guides the self-locking spring in the axial direction through the guide column, so that irregular movements such as deviation and inclination of the self-locking spring during axial movement are avoided, and the self-locking pin can be accurately inserted into the positioning locking groove of the shift fork shaft, so that the effective cooperation of the self-locking pin and the positioning locking groove is ensured, and the influence on the operation experience is reduced.

[0019] 2、The transmission self-locking structure is a split structure, simple to process, and non-rigidly connected between structures, with lower assembly difficulty between each component, the self-locking spring exerts a counterforce on the guide top cover to press the guide top cover on the actuator housing, fixing the overall position of the self-locking structure, without the need for fixing by screw connection and the like, facilitating the convenience and speed of self-locking structure overall installation. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the present application, the drawings required to be used in the description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Figure 1 The overall structure schematic diagram of the transmission self-locking structure according to one or more embodiments of the present application;

[0022] Figure 2 The cross-sectional structure schematic diagram of the transmission self-locking structure according to one or more embodiments of the present application;

[0023] Figure 3 The structure schematic diagram of the guide top cover according to one or more embodiments of the present application;

[0024] Figure 4 The cross-sectional structure schematic diagram of the self-locking pin according to one or more embodiments of the present application;

[0025] Figure 5 The working schematic diagram of the transmission self-locking structure according to one or more embodiments of the present application;

[0026] The components represented by the reference numerals in the drawings are as follows:

[0027] 1, guide top cover; 11, base; 12, guide column; 2, self-locking spring; 3, self-locking pin; 31, pin body; 32, oil guide groove; 33, oil storage groove; 34, head; 35, first chamfer; 36, second chamfer; 4, transmission housing; 5, shift fork shaft; 51, positioning locking groove; 6, actuator housing; 61, mounting plane; 7, self-locking hole. DETAILED DESCRIPTION

[0028] In order to make the purpose, characteristics and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be described clearly and completely in combination with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the patent, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the patent.

[0029] Embodiment 1

[0030] In a typical embodiment of the utility model, as shown in the drawings, Figures 1-5 A transmission self-locking structure is provided, comprising: a guide top cover 1, a self-locking spring 2, a self-locking pin 3, a transmission housing 4 and a shift lever shaft 5. The guide top cover 1, the self-locking spring 2 and the self-locking pin 3 are designed in a split type, and are non-rigidly connected, which facilitates installation, use and subsequent maintenance.

[0031] Specifically, the shift lever shaft 5 is installed in the transmission housing 4, the transmission housing 4 is provided with a self-locking hole 7, the self-locking hole 7 is a through hole structure, the self-locking hole 7 penetrates the transmission housing 4, the self-locking hole 7 is located above the shift lever shaft 5, the self-locking hole 7 is vertically arranged, the self-locking pin 3 is slidably arranged in the self-locking hole 7, the self-locking pin 3 is a hollow structure, one end of the self-locking spring 2 is inserted into the self-locking pin 3, the other end of the self-locking spring 2 abuts against the guide top cover 1, the guide top cover 1 is fixedly provided with a guide column 12, the guide column 12 is inserted into the self-locking spring 2, so as to guide the self-locking spring 2 in the axial direction, so as to avoid irregular movement of the self-locking spring 2 during axial movement, and thus the self-locking pin 3 can be accurately inserted into the positioning locking groove 51 on the shift lever shaft 5, ensuring effective cooperation between the self-locking pin 3 and the positioning locking groove 51, and reducing the influence on the operation experience; the side of the guide top cover 1 away from the self-locking pin 3 is used for abutting against an actuator housing 6, the self-locking pin 3 abuts against the shift lever shaft 5, the guide top cover 1 is pressed on the actuator housing 6 by the self-locking spring 2, so as to fix the overall position of the self-locking structure, without the need for fixing by screw connection or the like, thereby facilitating the convenience and speed of overall installation of the self-locking structure.

[0032] As shown in the drawings, Figure 3 The guide top cover 1 comprises a base 11 and a guide column 12, the base 11 is a plate structure, and the guide column 12 is a cylindrical structure. In this embodiment, the guide column 12 is fixedly installed at the center position of the base 11 by welding, the base 11 is used for abutting against the actuator housing 6, and the guide column 12 is used for being inserted into the self-locking spring 2, so as to guide the self-locking spring 2.

[0033] It can be understood that in other embodiments, the guide column 12 can also be connected with the base 11 in a threaded manner, at this time, a threaded hole is formed on the base 11, and an external thread is arranged on the end of the guide column 12, so as to realize the detachable connection between the base 11 and the guide column 12, and different lengths and diameters of the guide column 12 can be replaced according to actual needs, the overall adaptability is stronger, and different working requirements can be met.

[0034] The connection position of the guide column 12 and the base 11 is a transition structure, which contains an arc-shaped transition area. In this embodiment, the diameter of the guide column 12 is not greater than the inner diameter of the self-locking spring 2, so as to play a guiding role while avoiding interference with the action of the self-locking spring 2.

[0035] As shown in Figure 2 and Figure 4 , the self-locking pin 3 includes a pin body 31, an oil storage groove 33 and a head 34. The pin body 31 is a cylindrical structure, the oil storage groove 33 is formed in the pin body 31, and the oil storage groove 33 is coaxially arranged with the pin body 31. The top end of the oil storage groove 33 penetrates the top end of the pin body 31 to allow the insertion of the self-locking spring 2. The diameter of the oil storage groove 33 is slightly larger than the outer diameter of the self-locking spring 2, so that the self-locking spring 2 and the oil storage groove 33 are gap-fitted, which limits the deviation of the self-locking spring 2 while avoiding interference with the action of the self-locking spring 2. The head 34 is a hemispherical structure, and the head 34 is fixedly arranged at the bottom end of the pin body 31. The head 34 is not communicated with the oil storage groove 33. When shifting, after the shift fork shaft 5 moves a certain distance to the left or to the right, the head 34 at the bottom end of the pin body 31 is located in the positioning and locking groove 51 arranged on the shift fork shaft 5. Through the pressure of the self-locking spring 2, the shift fork shaft 5 is pressed tightly, the axial movement of the shift fork shaft 5 is limited, and the self-locking effect is achieved.

[0036] The oil storage groove 33 is not only used for the installation of the self-locking spring 2, but also used for the storage of lubricating oil to meet the lubrication requirement of the self-locking pin 3 and the self-locking spring 2 during reciprocating movement, and reduce the wear between components.

[0037] As shown in Figure 4 , the pin body 31 is further provided with an oil guide groove 32. The oil guide groove 32 is arranged at the top end of the pin body 31, and the oil guide groove 32 is coaxially arranged with the oil storage groove 33 and communicated with the oil storage groove 33. The oil guide groove 32 is located above the oil storage groove 33, and the diameter of the oil guide groove 32 is greater than that of the oil storage groove 33, so as to facilitate the injection of lubricating oil into the oil storage groove 33, and also facilitate the installation of the self-locking spring 2.

[0038] The bottom end of the pin body 31 is provided with a first chamfering part 35, which is a circular chamfering structure; the top end of the pin body 31 is provided with a second chamfering part 36, which is a linear chamfering structure; the first chamfering part 35 and the second chamfering part 36 are arranged to facilitate the installation of the self-locking pin 3 in the self-locking hole 7 and facilitate the reciprocating sliding of the self-locking pin 3 in the self-locking hole 7.

[0039] The transmission self-locking structure in the embodiment is a split structure, is simple to process, and is non-rigidly connected between structures, so that the assembly difficulty between various components is lower, the assembly is simple, the transmission can be more flexibly assembled and adjusted in the transmission case, in the case of overload, the non-rigid connection can release stress through deformation, avoids damage of the structure caused by excessive stress, thereby improving the overall safety, better adapts to the high-temperature and high-vibration working environment in the transmission case, reduces rigid impact and wear to a certain extent, and improves the reliability and stability of the components in the transmission case.

[0040] Embodiment 2

[0041] In another typical embodiment of the utility model, as shown in Figure 5 A transmission case is provided, which comprises an actuating mechanism and a transmission, the transmission adopts the transmission self-locking structure mentioned in embodiment 1, and the actuating mechanism is located above the transmission.

[0042] Specifically, the shift fork shaft 5 is installed in the transmission housing 4, the transmission housing 4 is provided with a self-locking hole 7, the self-locking hole 7 is a through hole structure, the self-locking hole 7 penetrates the transmission housing 4, the self-locking hole 7 is located above the shift fork shaft 5, the self-locking hole 7 is vertically arranged, the self-locking pin 3 is slidably arranged in the self-locking hole 7, the self-locking pin 3 is a hollow structure, one end of the self-locking spring 2 is inserted into the self-locking pin 3, the other end of the self-locking spring 2 abuts against the base 11, the base 11 is fixedly provided with a guide column 12, the guide column 12 is inserted into the self-locking spring 2, so that the guide column 12 guides the self-locking spring 2 in the axial direction, so as to avoid irregular movement of the self-locking spring 2 during axial movement, and then the self-locking pin 3 can be accurately inserted into the positioning locking groove 51 on the shift fork shaft 5, so as to ensure the effective cooperation between the self-locking pin 3 and the positioning locking groove 51, and reduce the influence on the operation experience; the side, away from the self-locking pin 3, of the base 11 abuts against the actuating mechanism housing 6, the self-locking pin 3 abuts against the shift fork shaft 5, the self-locking spring 2 exerts a counterforce on the guide top cover 1, and then the guide top cover 1 is pressed on the actuating mechanism housing 6, so as to fix the position of the self-locking structure as a whole, without the need for threaded connection or other fixing modes, thereby facilitating the convenience and speed of the overall installation of the self-locking structure.

[0043] In order to avoid the interference between the guide column 12 and the self-locking spring 2, the actuator housing 6 is leveled near the outer wall of the guide top cover 1 to form a mounting plane 61, which is located directly above the self-locking hole 7 and perpendicular to the axis of the self-locking hole 7, so as to ensure the coaxiality of the guide column 12 and the self-locking hole 7 after the installation of the guide top cover 1, thereby avoiding the interference between the guide column 2 and the self-locking spring 2.

[0044] The specific working principle is as follows:

[0045] During installation, the shift fork shaft 5 is first assembled into the transmission housing 4, and then the self-locking pin 3, the self-locking spring 2 and the guide top cover 1 are sequentially assembled into the self-locking hole 7 provided on the transmission housing 4, at this time, the lower end of the self-locking spring 2 is in contact with the bottom of the oil storage groove 32 of the self-locking pin 3, the guide column 12 of the guide top cover 1 is inserted into the self-locking spring 2, and finally the actuator housing 6 is placed above the self-locking structure of the transmission, the base 11 on the guide top cover 1 is in abutment with the mounting plane 61 on the actuator housing 6, so as to ensure that the guide column 12 does not interfere with the self-locking spring 2, thereby meeting the functional, performance and reliability requirements of the self-locking structure; the self-locking pin 3 of the self-locking structure cooperates with the positioning and locking groove 51 on the shift fork shaft 5 to position and lock the shift fork shaft 5; when maintenance of the self-locking structure is required later, the actuator housing 6 is only needed to be removed, and then the guide top cover 1, the self-locking spring 2 and the self-locking pin 3 are sequentially taken out; when different self-locking forces are required, only different self-locking springs 2 need to be replaced, which has strong applicability and is convenient for later maintenance.

[0046] The above description of the disclosed embodiments enables one of ordinary skill in the art to make or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the present application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A transmission self-locking structure, comprising: The transmission housing (4) and shift fork shaft (5) are characterized by having a self-locking hole (7) on the transmission housing (4) and the self-locking hole (7) being located above the shift fork shaft (5). The transmission housing (4) is characterized by having a self-locking hole (7) and a self-locking pin (3) that is vertically slidably disposed in the self-locking hole (7). The self-locking pin (3) is a hollow structure and a self-locking spring (2) is inserted inside the self-locking pin (3). The end of the self-locking spring (2) away from the self-locking pin (3) abuts against the guide top cover (1). The guide top cover (1) is provided with a guide post (12) which is inserted inside the self-locking spring (2). The side of the guide top cover (1) away from the self-locking pin (3) is used to abut against the actuator housing (6).

2. The transmission self-locking structure according to claim 1, characterized in that, The guide top cover (1) includes a base (11), which is a plate structure, and the guide column (12) is a cylindrical structure. The guide column (12) can be detachably installed at the center of the base (11).

3. The transmission self-locking structure according to claim 1, characterized in that, The diameter of the guide post (12) is not greater than the inner diameter of the self-locking spring (2).

4. The transmission self-locking structure according to claim 1, characterized in that, The self-locking pin (3) includes a pin body (31), which is a cylindrical structure. An oil reservoir (33) is provided inside the pin body (31). The oil reservoir (33) passes through the top of the pin body (31). The self-locking spring (2) is inserted into the oil reservoir (33). A head (34) is fixedly provided at the bottom of the pin body (31).

5. The transmission self-locking structure according to claim 4, characterized in that, The oil reservoir (33) and the pin (31) are coaxially arranged, and the self-locking spring (2) is fitted with the oil reservoir (33) with a clearance.

6. The transmission self-locking structure according to claim 4, characterized in that, The head (34) is a hemispherical structure.

7. The transmission self-locking structure according to claim 4, characterized in that, The shift fork shaft (5) is provided with a positioning locking groove (51), and the head (34) is used to be inserted into the positioning locking groove (51).

8. The transmission self-locking structure according to claim 4, characterized in that, The top of the pin (31) is provided with an oil guide groove (32), which is coaxially arranged with the oil storage tank (33). The diameter of the oil guide groove (32) is larger than that of the oil storage tank (33).

9. The transmission self-locking structure according to claim 4, characterized in that, The bottom periphery of the pin (31) is provided with a first chamfer (35), which is a rounded chamfer structure; the top periphery of the pin (31) is provided with a second chamfer (36), which is a straight chamfer structure.

10. A gearbox, characterized in that, include: The actuator housing (6) and the transmission self-locking structure as described in any one of claims 1-9 are provided with a mounting plane (61) on the actuator housing (6), the mounting plane (61) being perpendicular to the axis of the self-locking hole (7), and the base (11) abutting against the mounting plane (61).

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