Twelve-gear gearbox structure of commercial vehicle

Abstract

The utility model discloses a twelve-gear gearbox structure of a commercial vehicle, which prolongs the service life of an auxiliary box synchronizer and ensures that the whole gearbox runs stably and reliably for a long time. The main box part comprises a main box shell, a main box shaft I, a main box intermediate shaft, a main box shaft II and corresponding transmission gears on each group of shafts; the auxiliary box part comprises an auxiliary box shell, an auxiliary box intermediate shaft, an auxiliary box output shaft and an auxiliary box synchronizer; a first bearing is arranged at the penetrating position, corresponding to the auxiliary box shell outer end plate, of the auxiliary box output shaft in a sleeved mode, the outer end, exposed out of the auxiliary box, of the auxiliary box output shaft is fixedly connected with an output flange, an auxiliary box synchronizer is arranged at the inner end of the auxiliary box output shaft in a sleeved mode, and the auxiliary box output shaft and the main box second shaft are coaxially arranged.

Description

Technical Field

[0001] The utility model relates to the technical field of commercial vehicle gearboxes, in particular to a twelve-speed gearbox structure for commercial vehicles. Background Art

[0002] The existing twelve-speed gearbox of commercial vehicles includes a main box and an auxiliary box. The main box has a built-in double intermediate shaft structure. Generally, the main box is a six-speed gearbox and the auxiliary box is a two-speed gearbox (see Figure 1 ), the input end of the auxiliary box output shaft a is equipped with an auxiliary box synchronizer b, which is used to switch the high and low gears of the high gear, so that the output end can output the corresponding power; however, the auxiliary box output shaft of the existing twelve-speed gearbox is only equipped with a single-point support during actual assembly, that is, the auxiliary box output shaft a is only equipped with a corresponding bearing on the auxiliary box output cover plate side, resulting in a large amount of shaking of the external flange end of the auxiliary box output shaft a when receiving the power rotation output of the auxiliary box output shaft, thereby causing the coaxiality of the auxiliary box output shaft a and the main box second shaft c to deteriorate, resulting in a poor working environment and shifting posture of the auxiliary box synchronizer b, which makes the high-end life of the auxiliary box synchronizer b shorter; for this reason, it is urgently needed to develop a gearbox mechanism for improving the operating life of the auxiliary box synchronizer. Utility Model Content

[0003] In response to the above problems, the utility model provides a twelve-speed gearbox structure for commercial vehicles, which increases the operating life of the auxiliary box synchronizer and ensures long-term, stable and reliable operation of the entire gearbox.

[0004] A twelve-speed gearbox structure for a commercial vehicle, characterized in that it comprises:

[0005] The main box part includes the main box housing, the main box first shaft, the main box intermediate shaft, the main box second shaft, and the corresponding transmission gears on each set of shafts;

[0006] and an auxiliary box part, which includes an auxiliary box housing, an auxiliary box intermediate shaft, an auxiliary box output shaft, and an auxiliary box synchronizer;

[0007] The outer ring surface of the outer ring of the main box is fixed with a first transmission tooth, and the end surface of the outer ring of the main box is convex to form a shaft head part, and the inner end surface of the outer ring of the main box output shaft is concave to form a shaft head groove, and the outer circumference of the shaft head part is covered with a needle roller bearing, and the outer circumference of the needle roller bearing is tightly attached to the annular wall of the shaft head groove.

[0008] It is further characterized by:

[0009] The needle roller bearing is mounted in the corresponding bearing mounting groove of the annular frame. The annular frame is sleeved on the outer ring of the shaft head portion. The shaft head portion is sleeved with a limiting snap ring at the outer end corresponding to the corresponding annular frame. The shaft head portion is provided with an embedded groove at the outer ring position corresponding to the limiting snap ring, which ensures that the position of the limiting snap ring is stable and reliable.

[0010] The limiting snap ring is in close contact with the end face of the annular frame facing the output flange, and the other end face of the annular frame is in close contact with the inner end limiting stop protrusion of the shaft head portion, ensuring that the annular frame does not deviate axially;

[0011] The auxiliary box output shaft is provided with a second freely rotating transmission tooth at the end close to the output flange of the auxiliary box synchronizer, and a third transmission tooth is fixedly sleeved on the auxiliary box intermediate shaft. The third transmission tooth is meshed and connected with the second transmission tooth. The inner end of the auxiliary box intermediate shaft is fixedly connected to the outer end of the main box intermediate shaft.

[0012] After adopting the above technical scheme, the main box second shaft is added with an outward protruding shaft head part, the inner end of the auxiliary box output shaft is added with a shaft head groove, the needle roller bearing is arranged on the outer ring of the shaft head, and the outer ring of the shaft head part is arranged with a needle roller bearing and then inserted into the shaft head groove. Through the axial assembly of the main shaft two shafts and the axial assembly of the auxiliary box output shaft, the ring-laid needle roller bearing is reliably positioned in the axial position of the bearing groove, and the ring-laid needle roller bearing completes another point of reliable support for the auxiliary box output shaft, and cooperates with the first bearing to make the auxiliary box output shaft have two-point positioning, and the setting of the ring-laid needle roller bearing does not affect the two-point positioning of the main shaft two shafts. When the auxiliary box synchronizer moves axially along the auxiliary box output shaft to shift gears, the auxiliary box output shaft is reliably supported and set regardless of the auxiliary box synchronizer's axial position on the auxiliary box output shaft, thereby improving the operating life of the auxiliary box synchronizer and ensuring long-term, stable and reliable operation of the entire gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a twelve-speed gearbox for commercial vehicles in the prior art;

[0014] Figure 2 It is a partial schematic diagram of the structure of the utility model;

[0015] Figure 3 for Figure 2 A partial enlarged view of

[0016] The names corresponding to the serial numbers in the figure are as follows:

[0017] Main box part 100, main box housing 101, main box intermediate shaft 102, main box secondary shaft 103;

[0018] Auxiliary box part 200, auxiliary box housing 201, auxiliary box intermediate shaft 202, auxiliary box output shaft 203, auxiliary box synchronizer 204;

[0019] Connecting housing 1, outer end plate 2, first bearing 3, output flange 4, outer convex end 5, second bearing 6, first transmission tooth 7, shaft head part 8, inner end limit stop protrusion 81, shaft head groove 9, needle roller bearing 10, annular frame 11, limit snap ring 12, second transmission tooth 13, third transmission tooth 14, first meshing tooth 15, second meshing tooth 16, third meshing tooth 17. DETAILED DESCRIPTION

[0020] A twelve-speed gearbox structure for commercial vehicles, see Figure 2 、 Figure 3 , which includes a main box part 100 and a sub-box part 200;

[0021] The main gearbox part 100 includes a main gearbox housing 101, a main gearbox shaft 1 (not shown in the figure, belonging to the existing mature technology), a main gearbox intermediate shaft 102, a main gearbox shaft 2 103, and corresponding transmission gears on each shaft group. The main gearbox shaft 1, the main gearbox intermediate shaft 102, and the main gearbox shaft 2 103 are arranged in parallel at different positions.

[0022] The auxiliary box part 200 includes an auxiliary box housing 201, an auxiliary box intermediate shaft 202, an auxiliary box output shaft 203, and an auxiliary box synchronizer 204. The auxiliary box intermediate shaft 202 and the auxiliary box output shaft 203 are arranged in parallel at different positions;

[0023] The main box part 100 and the auxiliary box part 200 are both provided with a connecting shell 1, and the connecting shell 1 is shared;

[0024] The auxiliary box output shaft 203 is sleeved with a first bearing 3 at a through position corresponding to the outer end plate 2 of the auxiliary box housing 201. The outer end of the auxiliary box output shaft 203 exposed to the auxiliary box part 200 is fixedly connected with an output flange 4. The inner end of the auxiliary box output shaft 203 is sleeved with an auxiliary box synchronizer 204. The auxiliary box output shaft 203 and the main box second shaft 103 are coaxially arranged in sequence. The main box second shaft 103 is located in the main box housing 101 and protrudes toward one end of the auxiliary box housing 201. The main box second shaft 103 penetrates into the inner cavity of the auxiliary box housing to form an outer convex end 5. The main box second shaft 103 corresponds to the connection housing 1 position of the main box housing 101 and the auxiliary box housing 201 and is sleeved with a second bearing 6. The outer convex end 5 of the main box second shaft 103 is The annular surface is fixed with a first transmission tooth 7, the end surface of the outer convex end 5 of the main box second shaft 103 is convex to form a shaft head part 8, and the inner end surface of the auxiliary box output shaft 203 is concave to form a shaft head groove 9. The needle roller bearing 10 is installed in the corresponding bearing mounting groove of the annular frame 11. The annular frame 11 is sleeved on the outer ring of the shaft head part 8. The shaft head part 8 is sleeved with a limiting retaining ring 12 corresponding to the outer end of the corresponding annular frame 11. The shaft head part 8 is provided with an embedded groove at the outer ring position corresponding to the limiting retaining ring 12, which ensures that the position of the limiting retaining ring is stable and reliable; the outer ring of the shaft head part 8 is surrounded by a needle roller bearing 10 and then inserted into the shaft head groove 9, and the outer periphery of the needle roller bearing 10 is arranged close to the annular wall of the shaft head groove 9.

[0025] In specific implementation, the limiting snap ring 12 is in close contact with the end face of the annular frame 11 facing the output flange 4, and the other end face of the annular frame 11 is in close contact with the inner end limiting stop protrusion 81 of the shaft head part 8, ensuring that the annular frame 11 will not deviate axially.

[0026] In a specific embodiment, the auxiliary box output shaft 203 is sleeved with a freely rotating second transmission tooth 13 at the end portion close to the output flange 4 of the auxiliary box synchronizer 204, and a third transmission tooth 14 is fixedly sleeved on the auxiliary box intermediate shaft 202. The third transmission tooth 14 is meshed and connected to the second transmission tooth 13, and the inner end of the auxiliary box intermediate shaft 202 is fixedly connected to the outer end of the main box intermediate shaft 102.

[0027] In specific implementation, corresponding first meshing teeth 15 are respectively provided at both axial ends of the auxiliary box synchronizer 204, the second meshing teeth 16 are integrated on the first transmission teeth 7, and the third meshing teeth 17 are integrated on the second transmission teeth. The auxiliary box synchronizer 204 has three states: the first meshing teeth 15 are engaged with the second meshing teeth 16, and the output flange 4 outputs power in high gear; the first meshing teeth 15 are engaged with the third meshing teeth 17, and the output flange 4 outputs power in low gear. The first transmission teeth 15, the second meshing teeth 16, and the third meshing teeth 17 are not engaged, and the auxiliary box synchronizer 204 is in neutral state.

[0028] The auxiliary box synchronizer 204 has two gears, high gear and low gear. When shifting to low gear (output flange 4 end), the auxiliary box output shaft 203 itself has a certain guiding role; when shifting to high gear, the added needle roller bearing 10 can be used to help position the auxiliary box synchronizer 204 and play a guiding role; and the limit ring 12 can prevent the annular frame 11 corresponding to the needle roller bearing 10 from axially jumping.

[0029] Its working principle is as follows: an outward-convex shaft head part is added to the second shaft of the main box, a shaft head groove is added to the inner end of the output shaft of the auxiliary box, a needle roller bearing is arranged on the outer ring of the shaft head, and a needle roller bearing is arranged around the outer ring of the shaft head part and then inserted into the shaft head groove. Through the axial assembly of the two main shafts and the axial assembly of the output shaft of the auxiliary box, the needle roller bearing arranged on the ring is reliably positioned in the axial position of the bearing groove, and the needle roller bearing arranged on the ring completes another point of reliable support for the output shaft of the auxiliary box, and cooperates with the first bearing to make the output shaft of the auxiliary box have two-point positioning, and the setting of the needle roller bearing arranged on the ring does not affect the two-point positioning of the two main shafts. When the auxiliary box synchronizer moves axially along the output shaft of the auxiliary box to shift gears, the output shaft of the auxiliary box is reliably supported regardless of the axial position of the auxiliary box synchronizer on the output shaft of the auxiliary box, thereby improving the operating life of the auxiliary box synchronizer and ensuring long-term, stable and reliable operation of the entire gearbox.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A twelve-speed gearbox structure for a commercial vehicle, characterized in that: It includes: The main box part includes the main box housing, the main box first shaft, the main box intermediate shaft, the main box second shaft, and the corresponding transmission gears on each set of shafts; and an auxiliary box part, which includes an auxiliary box housing, an auxiliary box intermediate shaft, an auxiliary box output shaft, and an auxiliary box synchronizer; The outer ring surface of the outer ring of the main box is fixed with a first transmission tooth, and the end surface of the outer ring of the main box is convex to form a shaft head part, and the inner end surface of the outer ring of the main box output shaft is concave to form a shaft head groove, and the outer circumference of the shaft head part is covered with a needle roller bearing, and the outer circumference of the needle roller bearing is tightly attached to the annular wall of the shaft head groove.

2. The twelve-speed gearbox structure for commercial vehicles according to claim 1, characterized in that: The needle roller bearing is installed in the corresponding bearing installation groove of the annular frame. The annular frame is sleeved on the outer ring of the shaft head part. The shaft head part is sleeved with a limiting retaining ring corresponding to the outer end of the corresponding annular frame. The shaft head part is provided with an embedded groove at the outer ring position corresponding to the limiting retaining ring.

3. The twelve-speed gearbox structure for commercial vehicles according to claim 2, characterized in that: The limiting snap ring is in close contact with the end surface of the annular frame facing the output flange, and the other end surface of the annular frame is in close contact with the inner end limiting stop protrusion of the shaft head part.

4. The twelve-speed gearbox structure for commercial vehicles according to claim 1, characterized in that: The auxiliary box output shaft is provided with a second freely rotating transmission tooth at the end close to the output flange of the auxiliary box synchronizer, and a third transmission tooth is fixedly sleeved on the auxiliary box intermediate shaft. The third transmission tooth is meshed and connected with the second transmission tooth. The inner end of the auxiliary box intermediate shaft is fixedly connected to the outer end of the main box intermediate shaft.

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