Twelve-gear gearbox structure of commercial vehicle

Abstract

The invention discloses a twelve-gear gearbox structure of a commercial vehicle, which prolongs the operation 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 present invention relates to the technical field of commercial vehicle gearboxes, and in particular to a twelve-speed gearbox structure for commercial vehicles. Background Art

[0002] The existing twelve-speed gearbox for commercial vehicles includes a main box and an auxiliary box, wherein the main box has a built-in double intermediate shaft structure, and the main box is generally 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, and the high and low gears of the high gear are switched through the synchronizer b, so that the output end can output the corresponding power; however, the auxiliary box output shaft of the existing twelve-speed gearbox only has 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 short; for this reason, it is urgently needed to develop a gearbox mechanism for improving the operating life of the auxiliary box synchronizer. Summary of the invention

[0003] In view of the above problems, the present invention provides a twelve-speed gearbox structure for commercial vehicles, which increases the operating life of the auxiliary case 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 a main box housing, a main box first shaft, a main box intermediate shaft, a main box second shaft, and 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 auxiliary box output shaft is sleeved with a first bearing corresponding to the through position of the auxiliary box housing outer end plate, and the auxiliary box output shaft is exposed at the auxiliary box part. The outer end of the auxiliary box output shaft is fixedly connected with an output flange, and the inner end of the auxiliary box output shaft is sleeved with an auxiliary box synchronizer. The auxiliary box output shaft and the main box two shafts are arranged coaxially, and the main box two shafts are located in the main box housing, and protrude toward one end of the auxiliary box housing and penetrate into the inner cavity of the auxiliary box housing to form an outer convex end. The main box two shafts are sleeved with a second bearing corresponding to the connecting shell position of the main box housing and the auxiliary box housing, and the outer ring surface of the outer convex end of the main box two shafts is fixedly sleeved with a first transmission tooth, and the end surface of the outer convex end of the main box two shafts is convex to form a shaft head part, and the inner end surface of the auxiliary box output shaft is concave to form a shaft head groove, and the outer circumference of the shaft head part is surrounded by a needle roller bearing and then inserted into the shaft head groove, and the outer circumference of the needle roller bearing is arranged tightly against the annular wall of the shaft head groove.

[0008] It is further characterized by:

[0009] The needle 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 limit snap ring at the outer end corresponding to the corresponding annular frame, and the shaft head part is provided with an embedded groove at the outer ring position corresponding to the limit snap ring, which ensures that the position of the limit snap ring is stable and reliable;

[0010] The limiting clamp 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 part, so as to ensure that the annular frame will not deviate axially;

[0011] The auxiliary box output shaft is provided with a freely rotating second transmission tooth at the end corresponding to the auxiliary box synchronizer close to the output flange, and the auxiliary box intermediate shaft is fixedly provided with a third transmission tooth, and the third transmission tooth is meshed and connected with the second transmission tooth, and 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, an outwardly protruding 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 shafts of the main shaft 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. In combination with the first bearing, the output shaft of the auxiliary box has 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 shafts of the main shaft. 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 and arranged regardless of the axial position of the synchronizer on the output shaft of the auxiliary box, thereby improving the operating life of the synchronizer of the auxiliary box and ensuring long-term, stable and reliable operation of the entire gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram 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 present invention;

[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 box part 100 includes a main box housing 101, a main box first shaft (not shown in the figure, belonging to the existing mature technology), a main box intermediate shaft 102, a main box second shaft 103, and corresponding transmission gears on each set of shafts. The main box first shaft, the main box intermediate shaft 102, and the main box second shaft 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 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, and the outer end of the auxiliary box output shaft 203 exposed from the auxiliary box part 200 is fixedly connected with an output flange 4, and the inner end of the auxiliary box output shaft 203 is sleeved with an auxiliary box synchronizer 204, and 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, and the main box second shaft 103 penetrates into the inner cavity of the auxiliary box housing to form an outer convex end 5, and 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. The outer convex end 5 of the main box second shaft 103 is The annular surface is fixedly sleeved 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, 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 installation 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 snap ring 12 corresponding to the outer end of the corresponding annular frame 11, and the shaft head part 8 is provided with an embedded groove at the outer ring position corresponding to the limiting snap ring 12, which ensures that the position of the limiting snap 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 clamp 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 rotatable second transmission tooth 13 at the end portion corresponding to the auxiliary box synchronizer 204 close to the output flange 4, and the auxiliary box intermediate shaft 202 is fixedly sleeved with a third transmission tooth 14, which 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, the two axial ends of the auxiliary box synchronizer 204 are respectively provided with corresponding first meshing teeth 15, the first transmission teeth 7 are integrated with second meshing teeth 16, and the second transmission teeth are integrated with third meshing teeth 17. The auxiliary box synchronizer 204 has three states: the first meshing teeth 15 are meshed and connected with the second meshing teeth 16, and the output flange 4 outputs power in high gear; the first meshing teeth 15 are meshed 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 meshed, and the auxiliary box synchronizer 204 is in a 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 bearing 10 can be used to help position the auxiliary box synchronizer 204 and play a guiding role; and the limit retaining ring 12 can prevent the annular frame 11 corresponding to the needle bearing 10 from axially jumping.

[0029] Its working principle is as follows: an outwardly 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 second shaft of the main shaft 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 so that the output shaft of the auxiliary box has two-point positioning, and the setting of the needle roller bearing arranged on the ring does not affect the two-point positioning of the second shaft of the main shaft, and 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 and arranged regardless of the axial position of the synchronizer on the output shaft of the auxiliary box, thereby improving the operating life of the synchronizer of the auxiliary box 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 invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes 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 a main box housing, a main box first shaft, a main box intermediate shaft, a main box second shaft, and 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 auxiliary box output shaft is sleeved with a first bearing corresponding to the through position of the auxiliary box housing outer end plate, and the auxiliary box output shaft is exposed at the auxiliary box part. The outer end of the auxiliary box output shaft is fixedly connected with an output flange, and the inner end of the auxiliary box output shaft is sleeved with an auxiliary box synchronizer. The auxiliary box output shaft and the main box two shafts are arranged coaxially, and the main box two shafts are located in the main box housing, and protrude toward one end of the auxiliary box housing and penetrate into the inner cavity of the auxiliary box housing to form an outer convex end. The main box two shafts are sleeved with a second bearing corresponding to the connecting shell position of the main box housing and the auxiliary box housing, and the outer ring surface of the outer convex end of the main box two shafts is fixedly sleeved with a first transmission tooth, and the end surface of the outer convex end of the main box two shafts is convex to form a shaft head part, and the inner end surface of the auxiliary box output shaft is concave to form a shaft head groove, and the outer circumference of the shaft head part is surrounded by a needle roller bearing and then inserted into the shaft head groove, and the outer circumference of the needle roller bearing is arranged tightly against the annular wall of the shaft head groove.

2. A 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 snap 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 snap ring.

3. A twelve-speed gearbox structure for commercial vehicles according to claim 2, characterized in that: The limiting clamping 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. A twelve-speed gearbox structure for commercial vehicles according to claim 1, characterized in that: The auxiliary box output shaft is provided with a freely rotating second transmission tooth at the end corresponding to the auxiliary box synchronizer close to the output flange, and the auxiliary box intermediate shaft is fixedly provided with a third transmission tooth, and the third transmission tooth is meshed and connected with the second transmission tooth, and 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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