Structure for preventing gear selecting jamming of gearbox

Abstract

The utility model provides a structure for preventing a gearbox from being stuck during gear selection. The structure comprises a fourth-gear shifting fork shaft, a third-gear shifting fork shaft, a first-gear shifting fork shaft and a second-gear shifting fork shaft which are installed in the gearbox in parallel. Gear connecting blocks are arranged on the fourth gear shifting fork shaft, the third gear shifting fork shaft and the second gear shifting fork shaft, interlocking blocks are connected to the gear connecting blocks, and pressing tables are arranged on the interlocking blocks; a gear guide block is installed on the first gear shifting fork shaft, a pressing groove is formed in the gear guide block, and the pressing table is installed in the pressing groove. According to the structure, the pressing table and the pressing groove are matched to fix the gear guide block and limit the first gear shifting fork shaft, so that in the moving process of the first gear shifting fork shaft, resistance cannot be generated between the first gear shifting fork shaft and other shifting fork shafts, the gear shifting force is lighter, the gear guide block connected to the first gear shifting fork shaft can be prevented from tilting, and the gear shifting effect is better. And the gear shifting blocking phenomenon of the gearbox is effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission components, and particularly belongs to a structure for preventing gear selection jamming of a transmission. Background Art

[0002] With the continuous development of the automotive industry, transmission technology is also constantly progressing. The design of modern transmissions pays more attention to smoothness, economy and power performance, and the increase in the number of gears is one of the important means to achieve these goals. By increasing the number of gears of the transmission, the transmission can better match the engine speed and the driving speed of the wheels, so as to achieve more accurate power distribution and a smoother shifting experience.

[0003] The existing 6-speed MT transmission has an overdrive gear, and its gear arrangement is in the international gear arrangement, that is, the gear arrangement is successively five, six, four, three, two, one, reverse. The first and second gear shift fork shaft assemblies, the third and fourth gear shift fork shaft assemblies, and the fifth and sixth gear shift fork shaft assemblies are all in the forward gear for high gears. To meet the international gear arrangement, it is necessary to reverse the fifth and sixth gears, that is, reverse the fifth and sixth gear shift forks and the fifth and sixth gear shift fork shafts. Since the reversing support pins connected to the fifth and sixth gear shift forks are fixed on the housing, the fifth and sixth gear shift forks can only rotate around the reversing support pins under the limit of the reversing support pins and the synchronizer gear hub. The connection between the fifth and sixth gear shift fork shafts and the fifth and sixth gear shift forks is a square groove / round head connection, without a tight fit relationship. If a tight fit relationship is added, due to the superposition of machining errors, mutual extrusion may occur, resulting in abnormal stress on the fifth and sixth gear shift fork shafts, causing large gear shifting force for the fifth and sixth gears and abnormal wear of related parts. During the use of the transmission, the ball sockets provided on the fifth and sixth gear shift fork shafts are mutually extruded with the ball heads of the stud pins, causing the fifth and sixth gear shift fork shafts to rotate. After the fifth and sixth gear shift fork shafts rotate, they will prevent the shift block from moving to the position of selecting the fifth and sixth gears, resulting in gear selection jamming and gear selection failure of the transmission.

[0004] Currently, in the existing 6-speed MT transmission, in order to avoid gear selection jamming of the transmission, it is often to connect the fifth and sixth gear shift fork shafts and the third and fourth gear shift fork shafts through double-hole limit holes. The double-hole limit block is fixed on the fifth and sixth gear shift fork shafts through a fixing pin, and the double-hole limit holes are slidably connected with the third and fourth gear shift fork shafts. The fifth and sixth gear shift fork shafts are limited by the third and fourth gear shift fork shafts and the double-hole limit block; during the gear shifting process of the transmission, the double-hole limit block moves along with the fifth and sixth gear shift fork shafts, and then it will slide with the third and fourth gear shift fork shafts. The double-hole limit block is used to limit the fifth and sixth gear shift fork shafts to prevent them from rotating. Therefore, during the sliding process of the double-hole limit block on the third and fourth gear shift fork shafts, friction will be generated between the third and fourth gear shift fork shafts and the inner walls of the double-hole limit holes, generating resistance to the movement of the fifth and sixth gear shift fork shafts, resulting in jamming of the shift block and affecting the gear shifting efficiency of the transmission. And when the friction between the third and fourth gear shift fork shafts and the inner walls of the double-hole limit holes is too large, it will cause the fifth and sixth gear shift fork shafts to be jammed, resulting in gear shifting failure of the transmission. Content of the Utility Model

[0005] In order to solve the problem that in the existing 6-speed MT transmission during the shifting process, in a 6-speed MT transmission where the fifth and sixth gear shift forks are connected to the third and fourth gear shift forks through a double-hole limit block, during the shifting process, a frictional force will be generated between the third and fourth gear shift forks and the inner wall of the double-hole limit hole, thereby generating resistance, affecting the shifting efficiency of the transmission and causing the problem of shifting jamming in the transmission, the present utility model provides a structure for preventing gear selection jamming in the transmission.

[0006] To achieve the above object, the present utility model provides the following technical solutions:

[0007] The present utility model proposes a structure for preventing gear selection jamming in the transmission, including a fourth gear shift fork shaft, a third gear shift fork shaft, a first gear shift fork shaft, and a second gear shift fork shaft that are installed in parallel in the transmission; gear connection blocks are provided on the fourth gear shift fork shaft, the third gear shift fork shaft, and the second gear shift fork shaft, an interlock block is connected to the gear connection blocks, and a pressing platform is provided on the interlock block;

[0008] A gear guide block is installed on the first gear shift fork shaft, a pressing groove is provided on the gear guide block, and the pressing platform is installed in the pressing groove.

[0009] Preferably, there is a gap between the pressing groove and the side wall of the pressing platform.

[0010] Preferably, the width of the gap is 0.2 - 0.7 mm.

[0011] Preferably, the length of the pressing platform is 28.03 - 28.23 mm.

[0012] Preferably, the pressing platform is one or more of a powder metallurgy block, a 45 steel block, a 20cr block, and a 40cr block.

[0013] Preferably, the surface roughness of the pressing platform is 1.6 - 6.4 Ra.

[0014] Preferably, limiting platforms are symmetrically provided on the gear connection blocks, the distance between the limiting platforms is the same as the width of the pressing groove, and the interlock block is connected between the limiting platforms.

[0015] Preferably, an installation hole is provided on the gear guide block, an elastic pin is installed in the installation hole, and the inner end of the elastic pin is clamped in a pin hole provided on the first gear shift fork shaft.

[0016] Preferably, a connection groove is provided on the connection plate, and the connection groove is used to connect the shift lever.

[0017] Preferably, a ball socket is provided at the end of the first gear shift fork shaft far from the gear connection block, and the ball socket is used to connect the ball head.

[0018] Compared with the prior art, the utility model has the following beneficial technical effects:

[0019] The utility model provides a structure for preventing the gear selection of a gearbox from jamming. In this structure, a pressing platform is arranged on the interlock block, and the pressing platform cooperates with a pressing groove to fix the gear guide block, thereby limiting the first gear shift fork shaft to prevent the first gear shift fork shaft from rotating. This replaces the existing limit of the shift fork shaft by a double-hole limit block, so that when the first gear shift fork shaft moves, no resistance is generated on other shift fork shafts, thereby reducing the resistance during the gear shift of the gear connected to the first gear shift fork shaft and making the gear shift force more light. At the same time, through the cooperation of the pressing platform and the pressing groove, it is possible to prevent the gear guide block connected to the first gear shift fork shaft from tilting, effectively preventing the occurrence of the phenomenon of gear selection jamming in the gearbox.

[0020] Further, there is a gap between the side wall of the pressing groove and the pressing platform in this structure, and the width of the gap is 0.2 - 0.7 mm. By reserving the gap, the interlock block can move on the gear guide block, thereby realizing a smooth gear shift. At the same time, the length of the pressing platform is 28.03 - 28.23 mm, avoiding the influence of the overlong pressing platform on the gear shift of the gearbox.

[0021] Furthermore, the pressing platform in this structure is a powder metallurgy block and the surface roughness of the pressing platform is 1.6 - 6.4 Ra, which further ensures the sliding between the pressing platform and the pressing groove, reduces the friction force during the sliding process between the two, and reduces the gear shift resistance.

[0022] Furthermore, an installation hole is arranged on the gear guide block in this structure, and an elastic pin is installed in the installation hole. The inner end of the elastic pin is clamped in the pin hole arranged on the first gear shift fork shaft. Through the elastic pin, the gear guide block can be stably fixed on the first gear shift fork shaft, improving the stability of the gear shift in the gearbox. Brief Description of the Drawings

[0023] Figure 1 One of the schematic structural diagrams of a structure for preventing the gear selection of a gearbox from jamming provided by the utility model;

[0024] Figure 2 The front view structural diagram of a structure for preventing the gear selection of a gearbox from jamming provided by the utility model;

[0025] Figure 3 The side view structural diagram of a structure for preventing the gear selection of a gearbox from jamming provided by the utility model;

[0026] Figure 4 One of the connection diagrams of the first gear shift fork shaft, the gear guide block and the interlock block in a structure for preventing the gear selection of a gearbox from jamming provided by the utility model;

[0027] Figure 5 The second connection schematic diagram of the first gear shift fork shaft, gear shift guide block and interlock block in a structure for preventing gear selection jamming in a gearbox provided by the present utility model;

[0028] Figure 6 The three-dimensional structure schematic diagram of the interlock block in a structure for preventing gear selection jamming in a gearbox provided by the present utility model;

[0029] Figure 7 The front view structure schematic diagram of the interlock block in a structure for preventing gear selection jamming in a gearbox provided by the present utility model;

[0030] Figure 8 The top view structure schematic diagram of the interlock block in a structure for preventing gear selection jamming in a gearbox provided by the present utility model;

[0031] Figure 9 The side view structure schematic diagram of the interlock block in a structure for preventing gear selection jamming in a gearbox provided by the present utility model;

[0032] In the drawings: 1. Interlock block; 10. Connecting plate; 11. Pressing platform; 12. Connecting groove; 2. Gear shift guide block; 20. Pressing groove; 3. Elastic pin; 4. First gear shift fork shaft; 40. Square groove; 41. Ball socket; 5. Second gear shift fork shaft; 6. Third gear shift fork shaft; 7. Fourth gear shift fork shaft; 8. Reversing support pin; 9. Shifting fork. Detailed implementation manners

[0033] In the following text, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present utility model. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0036] In the present utility model, unless otherwise clearly defined and limited, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature in terms of horizontal height. The first feature being "under", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower level than the second feature in terms of horizontal height.

[0038] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0039] The present utility model provides a structure for preventing gear selection jamming in a gearbox. In this structure, a connection groove 12 is provided on a gear position guide block 2 connected to a shift fork shaft of the gearbox, and the connection groove 12 cooperates with a pressing platform 11 provided on an interlock block 1 to restrict the rotation of the shift fork shaft and enable it to move smoothly, so that the gear shifting of the gearbox is smooth and the phenomenon of jamming is avoided.

[0040] See Figures 1 to 9, the present utility model proposes a structure for preventing gear selection jamming in a gearbox, which includes a fourth gear shift fork shaft 7, a third gear shift fork shaft 6, a second gear shift fork shaft 5, a first gear shift fork shaft 4, a gear guide block 2 and an interlock block 1 installed in the gearbox. Among them, the first gear shift fork shaft 4 is a fifth and sixth gear shift fork shaft, the second gear shift fork shaft 5 is a third and fourth gear shift fork shaft, the third gear shift fork shaft 6 is a first and second gear shift fork shaft, and the fourth gear shift fork shaft 7 is a reverse gear shift fork shaft; wherein, the fourth gear shift fork shaft 7, the third gear shift fork shaft 6, the second gear shift fork shaft 5 and the first gear shift fork shaft 4 are all installed in the gearbox. The fourth gear shift fork shaft 7, the third gear shift fork shaft 6, the second gear shift fork shaft 5 and the first gear shift fork shaft 4 are arranged in parallel, and the fourth gear shift fork shaft 7, the third gear shift fork shaft 6, the second gear shift fork shaft 5 and the first gear shift fork shaft 4 are located in the same horizontal plane. The fourth gear shift fork shaft 7 and the first gear shift fork shaft 4 are located on both sides, the third gear shift fork shaft 6 and the second gear shift fork shaft 5 are located between the fourth gear shift fork shaft 7 and the first gear shift fork shaft 4, the second gear shift fork shaft 5 is adjacent to the first gear shift fork shaft 4, and the third gear shift fork shaft 6 is adjacent to the fourth gear shift fork shaft 7; shift forks 9 are connected to the fourth gear shift fork shaft 7, the third gear shift fork shaft 6, the second gear shift fork shaft 5 and the first gear shift fork shaft 4. A reversing support pin 8 is arranged on the shift fork 9, and the reversing support pin 8 is connected to the housing of the gearbox. The fourth gear shift fork shaft 7, the third gear shift fork shaft 6, the second gear shift fork shaft 5 and the first gear shift fork shaft 4 are moved through the shift fork 9. One end of the first gear shift fork shaft 4 is provided with a square groove 40, and the square groove 40 is used to connect the round head on the shift fork 9. A ball socket 41 is arranged on the outer wall of the first gear shift fork shaft 4 near the other end head, and a ball head is connected in the ball socket 41. The ball head helps to reduce the resistance and impact during the shifting process, making the shifting process smoother and more stable.

[0041] See Figures 1 to 9, a gear connection block is connected to the same-side ends of the fourth gear shift fork shaft 7, the third gear shift fork shaft 6, and the second gear shift fork shaft 5. Moreover, the positions on the outer walls of the fourth gear shift fork shaft 7, the third gear shift fork shaft 6, and the second gear shift fork shaft 5 where the gear connection blocks are installed correspond to each other. The same-side end faces of the gear connection blocks on the fourth gear shift fork shaft 7, the third gear shift fork shaft 6, and the second gear shift fork shaft 5 are flush. The gear connection block includes a connecting sleeve. Two limiting platforms are arranged at positions on the outer wall of the connecting sleeve above the shift fork shaft. An interlocking block 1 is connected between the two limiting platforms on the gear connection block, and the interlocking block 1 slides between the limiting platforms. A gear guide block 2 is installed at the position corresponding to the gear connection block on the first gear shift fork shaft 4. An installation hole is provided on the gear guide block 2, and an elastic pin 3 is installed in the installation hole. The inner end of the elastic pin 3 is clamped in the pin hole provided on the first gear shift fork shaft 4, connecting the gear guide block 2 and the first gear shift fork shaft 4 together; a pressing groove 20 is provided on the gear guide block 2, and the width of the pressing groove 20 is equal to the distance between the two limiting platforms. The interlocking block 1 includes a connecting plate 10. A connecting groove 12 is provided at the central position of the connecting plate 10, and the connecting groove 12 is used to connect the shift lever. A pressing platform 11 is provided on the lower end face of the connecting plate 10. The length of the pressing platform 11 is 28.03 - 28.23 mm, and it is one or more of a powder metallurgy block, a 45 steel block, a 20cr block, and a 40cr block. To reduce the manufacturing cost, the pressing platform 11 is preferably a powder metallurgy block. The pressing platform 11 is symmetrically arranged with respect to the connecting groove 12. The pressing platform 11 is installed between the limiting platforms provided on the gear connection block and in the pressing groove 20 on the gear guide block 2 to limit the gear guide block 2, and further limit the first gear shift fork shaft 4 to prevent it from rotating. Moreover, the first gear shift fork shaft 4 will not generate frictional resistance with the second gear shift fork shaft 5 during the movement, making the gearshift of the transmission stable and reliable. And there is a gap between the pressing groove 20 and the side wall of the pressing platform 11, and the width of the gap is 0.2 - 0.7 mm, enabling the pressing platform 11 to slide in the pressing groove 20. The surface roughness of the pressing platform 11 is 1.6 - 6.4 Ra, reducing the frictional force during the sliding of the pressing platform 11 in the pressing groove 20. By using the pressing platform 11 to limit the gear guide block 2, and further limit the first gear shift fork shaft 4 to prevent it from rotating, during the gearshift of the transmission, the first gear shift fork shaft 4 can stably move along its axial direction. At the same time, during the movement, there is no double-hole limiting block between the first gear shift fork shaft 4 and the second gear shift fork shaft 5 for limiting, thereby reducing the resistance during the movement, improving the gearshift efficiency of the gear connected to the first gear shift fork shaft 4, and reducing gearshift jams.

[0042] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic features of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0043] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present utility model, and the protection scope of the present utility model cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present utility model falls within the protection scope of the claims of the present utility model.

Claims

1. A structure for preventing gear selection jamming in a gearbox, characterized in that, It includes a fourth gear shift fork shaft (7), a third gear shift fork shaft (6), a first gear shift fork shaft (4) and a second gear shift fork shaft (5) which are installed in parallel in the gearbox; on the fourth gear shift fork shaft (7), the third gear shift fork shaft (6) and the second gear shift fork shaft (5), a gear connection block is connected near one end of each of them, and an interlock block (1) is connected to the gear connection block. The interlock block (1) includes a connecting plate (10), and a pressing platform (11) is arranged on the connecting plate (10); a gear guide block (2) is installed on the first gear shift fork shaft (4), and a pressing groove (20) is arranged on the gear guide block (2), and the pressing platform (11) is installed in the pressing groove (20).

2. The anti-selection jamming structure of a gearbox according to claim 1, characterized in that, There is a gap between the side wall of the pressing groove (20) and the pressing platform (11).

3. The anti-selection jamming structure of a gearbox according to claim 2, characterized in that, The width of the gap is 0.2 - 0.7 mm.

4. A structure for preventing gear selection jamming in a gearbox according to claim 2, characterized in that, The length of the pressing platform (11) is 28.03 - 28.23 mm.

5. The anti-blocking structure for gear selection of a gearbox according to claim 2, characterized in that, The surface roughness of the pressing platform (11) is 1.6 - 6.4 Ra.

6. A structure for preventing gear selection jamming in a gearbox according to claim 1, characterized in that, Limit platforms are symmetrically arranged on the gear connection block, the distance between the limit platforms is the same as the width of the pressing groove (20), and the interlock block (1) is connected between the limit platforms.

7. A structure for preventing gear selection jamming in a gearbox according to claim 1, characterized in that, An installation hole is arranged on the gear guide block (2), and an elastic pin (3) is installed in the installation hole, and the inner end of the elastic pin (3) is clamped in a pin hole arranged on the first gear shift fork shaft (4).

8. A structure for preventing gear selection jamming in a gearbox according to claim 1, characterized in that, A connecting groove (12) is arranged on the connecting plate (10), and the connecting groove (12) is used for connecting a shift lever.

9. A structure for preventing gear selection jamming in a gearbox according to claim 1, characterized in that, A ball socket (41) is arranged at the end of the first gear shift fork shaft (4) far from the gear connection block, and the ball socket (41) is used for connecting a ball head.

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