Transmission speed changer with compact structure

Abstract

The invention discloses a compact-structure transmission which comprises a gearbox body, a torque converter is mounted on the outer side of the gearbox body, a turbine shaft of the torque converter is connected with a clutch shaft on the gearbox body, and the clutch shaft, a first idler shaft, a second idler shaft, a front axle gear shifting output shaft and a rear axle output shaft are arranged in the gearbox body; the clutch shaft is movably connected with a first gear and a second gear through bearings, a third gear and a fourth gear are fixed or formed on the first idler shaft, and a fifth gear, a sixth gear, a seventh gear and an eighth gear are fixed or formed on the second idler shaft. The front axle gear shifting output shaft is movably connected with a ninth gear, a tenth gear, an eleventh gear and a twelfth gear; a manual control mechanical gear shifting structure and a wet clutch control reversing structure are adopted, multi-gear advancing and retreating are achieved, the size is small, and occupied space is small.

Description

Technical field:

[0001] The present invention relates to the technical field of transmissions, and more particularly to a transmission with a compact structure. Background technology:

[0002] At present, the transmission gearbox in the field of forklift manufacturing generally adopts hydraulic gearbox, and its internal gear shifting is controlled by wet clutch. However, wet clutch has high cost, complex structure and large space occupation, which greatly increases the size of the gearbox and cannot meet the installation and use requirements of some small spaces.

[0003] Moreover, for some manual transmission gearboxes, the space occupied is relatively small, but they are generally provided with multiple forward gears and only a single reverse gear, which cannot meet the use needs. Summary of the invention:

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a compact transmission which adopts a manually controlled mechanical shifting structure and a wet clutch controlled reversing structure to achieve multi-speed forward and reverse movement, and has a small size and occupies little space.

[0005] The solution of the present invention to solve the technical problem is:

[0006] A transmission with a compact structure comprises a transmission case, a torque converter is installed on the outer side of the transmission case, a turbine shaft of the torque converter is connected to a clutch shaft on the transmission case, and a clutch shaft, a first idler shaft, a second idler shaft, a front axle shift output shaft and a rear axle output shaft are arranged in the transmission case;

[0007] The clutch shaft is movably connected with a first gear and a second gear through a bearing, the first idler shaft is fixed or formed with a third gear and a fourth gear, the second idler shaft is fixed or formed with a fifth gear, a sixth gear, a seventh gear and an eighth gear, the front axle shift output shaft is movably connected with a ninth gear, a tenth gear, an eleventh gear and a twelfth gear, the front axle shift output shaft is also connected with a thirteenth gear through a spline, and the rear axle output shaft is fixed or formed with a fourteenth gear;

[0008] The first gear is meshed with the fifth gear, the second gear is meshed with the fourth gear, the third gear is meshed with the fifth gear, the fifth gear is meshed with the ninth gear, the sixth gear is meshed with the tenth gear, the seventh gear is meshed with the eleventh gear, the eighth gear is meshed with the twelfth gear, and the thirteenth gear is meshed with the fourteenth gear.

[0009] The front axle shift output shaft is inserted into the central through holes of the ninth gear, the tenth gear, the eleventh gear and the twelfth gear, and the inner side walls of the central through holes of the ninth gear, the tenth gear, the eleventh gear and the twelfth gear are movably connected to the outer side walls of the front axle shift output shaft through a needle roller retainer assembly.

[0010] A secondary transmission gear ring is welded and fixed on the outer side wall of the side where the ninth gear and the tenth gear are close to each other, and a secondary transmission gear ring is also welded and fixed on the outer side wall of the side where the eleventh gear and the twelfth gear are close to each other;

[0011] An external spline protrusion is formed on the outer side wall of the front axle shift output shaft between the two corresponding auxiliary transmission gear rings on the left and right, and a spline groove is formed on the inner side wall of the middle through hole of the middle transmission gear. The front axle shift output shaft is inserted into the middle through hole of the middle transmission gear, and the external spline protrusion is inserted into the corresponding spline groove and matched with the spline groove. The outer fork ring body is inserted into the corresponding middle transmission gear, and a tooth groove is formed in the middle of the inner side wall of the outer fork ring body. The external tooth part on the outer side wall of the corresponding middle transmission gear is inserted into the tooth groove and matched with the tooth groove.

[0012] The left and right parts of the inner side wall of the outer fork ring body are both formed with transmission tooth-shaped grooves, which correspond to the outer tooth parts of the two corresponding auxiliary transmission gear rings on the left and right. Extension sleeves are formed on the relative wall surfaces of the two corresponding auxiliary transmission gear rings on the left and right. The outer side wall of the extension sleeve is a conical wall surface. The diameter of the outer side wall of the two extension sleeves at the end close to each other is smaller than that at the end away from each other. A transition transmission sleeve is sleeved on the outer side wall of each extension sleeve. The inner side wall of the transition transmission sleeve is a conical wall surface, which is close to and matched with the outer side wall of the corresponding extension sleeve. Main annular grooves are formed on the left and right end surfaces of the middle transmission gear near the outside. The extension sleeve and the transition transmission sleeve are inserted into the corresponding main annular groove. A plurality of limiting grooves are formed on the inner wall surface at the outer side of the main annular groove. A plurality of limiting parts are formed on the outer side wall of the transition transmission sleeve. The limiting part is inserted into the corresponding limiting groove. An extension edge extending radially outward is formed on the outer side wall of the transition transmission sleeve extending out of the main annular groove. A transition tooth part is formed on the extension edge. The transition tooth part corresponds to the outer tooth part of the corresponding auxiliary transmission gear ring.

[0013] A limited position protrusion is formed on the outer side wall of the ends away from the outer teeth of the two corresponding auxiliary transmission gear rings on the left and right, and corresponds to the left end face or the right end face of the outer fork ring body.

[0014] An outer ring groove is formed in the middle of the outer side wall of the outer fork ring body, and the corresponding arc-shaped shifting part is inserted into the corresponding outer ring groove and matched with the outer ring groove, and the part of the arc-shaped shifting part in the outer ring groove is larger than half of the outer ring groove.

[0015] A connecting portion is formed on each arc-shaped toggle portion, and a connecting sleeve is formed on the connecting portion. Two horizontal shafts extending left and right and corresponding to each other are provided in the gearbox body at the side corresponding to the front axle shift output shaft. The left end of the horizontal shaft is inserted into the left insertion hole formed on the inner side wall of the left side plate of the gearbox body, and the right end of the horizontal shaft is inserted into the right insertion hole formed on the inner side wall of the right side plate of the gearbox body. One of the connecting sleeves is located on the horizontal shaft and fixed on the horizontal shaft, and the other connecting sleeve is located on the other horizontal shaft and fixed on this horizontal shaft.

[0016] A toggle sleeve is fixed on each of the two transverse shafts, the two toggle sleeves correspond to each other, the upper ends of the two toggle sleeves are formed with extension parts, the relative walls of the two extension parts are close to each other and slots are formed in the middle thereof, a gear control lever is installed on the gearbox body, a shift block is fixed or formed at the end of the gear control lever, the shift block cooperates with the two slots, and the shift block is inserted in the two slots.

[0017] The outer wall of the left end of the transverse shaft is close to or in close contact with the inner wall of the left insertion hole, and the outer wall of the right end of the transverse shaft is close to or in close contact with the inner wall of the right insertion hole;

[0018] A middle through hole extending forward and backward is formed on the inner side wall of the adjacent side of the two left insertion holes, and the middle through hole is communicated with the two left insertion holes. The limit rod is inserted into the middle through hole, and the outer side wall of the limit rod is tightly attached to the inner side wall of the middle through hole. Both ends of the limit rod are spherical surfaces, which cooperate with the first concave holes formed on the outer side walls of the left ends of the two transverse axes. One end of the limit rod extends into the middle through hole and is inserted into one of the corresponding first concave holes.

[0019] Three positioning recessed holes that are close to each other and arranged laterally are formed on the outer side walls of the right parts of the two transverse rods. Connecting through holes extending to the corresponding right plug hole are formed on the front wall and rear wall of the gearbox body corresponding to the right plug hole. An internal thread is formed on the inner side wall of the outer end of the connecting through hole. The screw portion of the locking bolt is screwed on the internal thread at the outer end of the corresponding connecting through hole. A compression spring and a ball are inserted into the connecting through hole. The ball portion extends out of the inner end of the connecting through hole and is located in a corresponding positioning recessed hole. One end of the compression spring exerts force on the inner end face of the screw portion of the corresponding locking bolt, and the other end of the compression spring presses against the corresponding ball. The rotating portion of the locking bolt presses against the front wall or rear wall of the corresponding gearbox body.

[0020] A sealing ring is embedded on the inner side wall of the rotating part of the locking bolt, and the sealing ring is pressed against the corresponding front wall surface or rear wall surface of the gearbox body.

[0021] A through hole is formed at the corresponding position of the gearbox body, the gear control lever is inserted into the through hole, and its bottom end extends into the gearbox body. A connecting seat is fixed on the outer wall surface of the gearbox body at the through hole, and an inner cavity penetrating from top to bottom is formed in the middle of the connecting seat, and its upper inner side wall is a spherical wall surface. The middle spherical body of the gear control lever is in the inner cavity of the connecting seat, and the lower outer side wall of the middle spherical body is close to or close to the spherical wall surface. An elastic sealing block is clamped in the top of the inner cavity of the connecting seat, and the top surface of the middle spherical body is pressed against the bottom surface of the elastic sealing block, and the upper part of the gear control lever extends out of the top surface of the middle through hole of the elastic sealing block.

[0022] The outstanding effects of the present invention are:

[0023] Compared with the prior art, it adopts a manually controlled mechanical shifting structure and a wet clutch controlled reversing structure to achieve multi-gear forward and reverse movement, and it is small in size and occupies little space. Description of the drawings:

[0024] Figure 1 It is a simplified schematic diagram of the present invention;

[0025] Figure 2 is a structural sectional view of a gearbox body of the present invention;

[0026] Figure 3 yes Figure 2 A partial enlarged view of

[0027] Figure 4 It is a partial cross-sectional view of the front axle shift output shaft;

[0028] Figure 5 yes Figure 4 A partial enlarged view of

[0029] Figure 6 It is a schematic diagram of the local structure between the gearbox body, the gear control lever and one of the arc-shaped toggle parts;

[0030] Figure 7 It is a schematic diagram of the local structure between the gearbox body, the gear control lever and an arc-shaped toggle part. Specific implementation method:

[0031] For example, see Figures 1 to 7 As shown, a transmission transmission with a compact structure includes a transmission case 100, a torque converter 20 is installed on the outer side of the transmission case 100, a turbine shaft 201 of the torque converter 20 is connected to a clutch shaft 30 on the transmission case 100, and the transmission case 100 is provided with a clutch shaft 30, a first idler shaft 40, a second idler shaft 50, a front axle shift output shaft 60 and a rear axle output shaft 900;

[0032] The clutch shaft 30 is movably connected with the first gear 1 and the second gear 2 through a bearing, the first idler shaft 40 is fixed or formed with the third gear 3 and the fourth gear 4, the second idler shaft 50 is fixed or formed with the fifth gear 5, the sixth gear 6, the seventh gear 7 and the eighth gear 8, the front axle shift output shaft 60 is movably connected with the ninth gear 9, the tenth gear 10, the eleventh gear 11 and the twelfth gear 12, the front axle shift output shaft 60 is also connected with the thirteenth gear 13 through a spline, and the rear axle output shaft 900 is fixed or formed with the fourteenth gear 14;

[0033] The first gear 1 meshes with the fifth gear 5, the second gear 2 meshes with the fourth gear 4, the third gear 3 meshes with the fifth gear 5, the fifth gear 5 meshes with the ninth gear 9, the sixth gear 6 meshes with the tenth gear 10, the seventh gear 7 meshes with the eleventh gear 11, the eighth gear 8 meshes with the twelfth gear 12, and the thirteenth gear 13 and the fourteenth gear 14 mesh.

[0034] Furthermore, the output ends of the front axle shift output shaft 60 and the rear axle output shaft 900 both extend out of the gearbox body 100 .

[0035] Furthermore, a gear oil pump 300 is fixed on the outer side wall of the gearbox body 100, the input end of the clutch shaft 30 extends out of the central through hole of the rotating shaft of the gearbox body 100 and the gear oil pump 300 and is inserted into the central spline hole of the turbine shaft 201 of the torque converter 20, and the outer side wall of the input end of the clutch shaft 30 is a spline protrusion, which is inserted into the central spline hole of the turbine shaft 201 and matched with it.

[0036] Furthermore, both ends of the clutch shaft 30 , the first idler shaft 40 , the second idler shaft 50 , the front axle shift output shaft 60 and the rear axle output shaft 900 are movably connected to the side wall of the gearbox body 100 through bearings.

[0037] Furthermore, a dual clutch structure is installed on the clutch shaft 30 .

[0038] Furthermore, the front axle shift output shaft 60 is inserted into the center through holes of the ninth gear 9, the tenth gear 10, the eleventh gear 11 and the twelfth gear 12, and the inner wall of the center through hole of the ninth gear 9, the tenth gear 10, the eleventh gear 11 and the twelfth gear 12 is movably connected to the outer wall of the front axle shift output shaft 60 through a needle roller retainer assembly.

[0039] The needle roller cage is composed of a plurality of needle rollers installed on the cage, which is a product that can be directly purchased on the market and will not be described in detail here.

[0040] Furthermore, a secondary transmission gear ring 15 is welded and fixed on the outer side wall of the side where the ninth gear 9 and the tenth gear 10 are close to each other, and a secondary transmission gear ring 15 is also welded and fixed on the outer side wall of the side where the eleventh gear 11 and the twelfth gear 12 are close to each other;

[0041] An external spline protrusion is formed on the outer side wall of the front axle shift output shaft 60 between the two corresponding left and right auxiliary transmission gear rings 15, and a spline groove is formed on the inner side wall of the middle through hole of the middle transmission gear 70. The front axle shift output shaft 60 is inserted into the middle through hole of the middle transmission gear 70, and the external spline protrusion is inserted into the corresponding spline groove and cooperates with the spline groove. The outer fork ring body 71 is inserted into the corresponding middle transmission gear 70, and a tooth groove is formed in the middle of the inner side wall of the outer fork ring body 71. The external tooth portion on the outer side wall of the corresponding middle transmission gear 70 is inserted into the tooth groove and cooperates with the tooth groove.

[0042] The left and right parts of the inner wall of the outer fork ring body 71 are formed with transmission tooth-shaped grooves, which correspond to the outer tooth parts of the two corresponding auxiliary transmission gear rings 15 on the left and right. The opposite wall surfaces of the two corresponding auxiliary transmission gear rings 15 on the left and right are formed with extension sleeves 151. The outer wall of the extension sleeve 151 is a conical wall surface. The diameter of the outer wall of the two extension sleeves 151 at the end close to each other is smaller than that at the end far away from each other. A transition transmission sleeve 152 is sleeved on the outer wall of each extension sleeve 151. The inner wall of the transition transmission sleeve 152 is a conical wall surface, which is close to and matched with the outer wall of the corresponding extension sleeve 151. Main annular grooves are formed on both left and right end surfaces near the outer side of the middle transmission gear 70, and the extension sleeve 151 and the transition transmission sleeve 152 are inserted into the corresponding main annular grooves. A plurality of limiting grooves are formed on the inner wall surface of the outer side of the main annular groove, and a plurality of limiting parts are formed on the outer wall of the transition transmission sleeve 152. The limiting parts are inserted into the corresponding limiting grooves. An extension edge extending radially outward is formed on the outer wall of the transition transmission sleeve 152 extending out of the main annular groove, and a transition tooth portion 153 is formed on the extension edge. The transition tooth portion 153 corresponds to the outer tooth portion of the corresponding auxiliary transmission gear ring 15;

[0043] A limiting protrusion is formed on the outer side wall of the ends away from the outer teeth of the two corresponding auxiliary transmission gear rings 15 on the left and right, and corresponds to the left end face or the right end face of the outer fork ring body 71.

[0044] Furthermore, an outer annular groove is formed in the middle of the outer side wall of the outer fork ring body 71, and the corresponding arc-shaped shifting portion 72 is inserted into the corresponding outer annular groove and cooperates with the outer annular groove. The portion of the arc-shaped shifting portion 72 in the outer annular groove is larger than half of the outer annular groove, so that the arc-shaped shifting portion 72 is stably connected to the outer annular groove and is not easy to fall off.

[0045] Further, each arc-shaped toggle portion 72 is formed with a connecting portion 73, and a connecting sleeve 74 is formed on the connecting portion 73. Two horizontal shafts 80 extending left and right and corresponding to each other are provided in the gearbox body 100 at the side corresponding to the front axle shift output shaft 60. The left end of the horizontal shaft 80 is inserted into the left plug hole 101 formed on the inner side wall of the left side plate of the gearbox body 100, and the right end of the horizontal shaft 80 is inserted into the right plug hole 102 formed on the inner side wall of the right side plate of the gearbox body 100. One of the connecting sleeves 74 is on the horizontal shaft 80 and fixed on the horizontal shaft 80, and the other connecting sleeve 74 is on the other horizontal shaft 80 and fixed on this horizontal shaft 80.

[0046] A shift sleeve 81 is fixed on each of the two transverse shafts 80, and the two shift sleeves 81 correspond to each other. An extension portion 82 is formed at the upper end of the two shift sleeves 81, and a slot 83 is formed near the middle of the relative wall surfaces of the two extension portions 82. A gear control lever 90 is installed on the gearbox body 100, and a shift block 91 is fixed or formed at the end of the gear control lever 90, and the shift block 91 cooperates with the two slots 83, and the shift block 91 is inserted into the two slots 83.

[0047] Furthermore, the outer wall of the left end of the transverse shaft 80 is close to or in close contact with the inner wall of the left insertion hole 101, and the outer wall of the right end of the transverse shaft 80 is close to or in close contact with the inner wall of the right insertion hole 102;

[0048] A middle through hole 103 extending forward and backward is formed on the inner side wall of the adjacent side of the two left plug holes 101, and the middle through hole 103 is communicated with the two left plug holes 101. A limiting rod 104 is inserted into the middle through hole 103, and the outer side wall of the limiting rod 104 is tightly attached to the inner side wall of the middle through hole 103. Both ends of the limiting rod 104 are spherical surfaces, which cooperate with the first recessed holes 84 formed on the outer side walls of the left ends of the two transverse shafts 80. One end of the limiting rod 104 extends into the middle through hole 103 and is inserted into one of the corresponding first recessed holes 84.

[0049] Further, three positioning recessed holes 85 close to each other and arranged laterally are formed on the outer side walls of the right parts of the two transverse rods 80, and connecting through holes 106 extending toward the corresponding right plug hole 102 are formed on the front wall and rear wall of the gearbox body 100 corresponding to the right plug hole 102, and internal threads are formed on the inner side walls of the outer ends of the connecting through holes 106, and the screw portion of the locking bolt 107 is screwed on the internal threads at the outer ends of the corresponding connecting through holes 106, and a compression spring 108 and a ball 109 are inserted into the connecting through holes 106, and the ball 109 partially extends out of the inner end of the connecting through holes 106 and is located in a corresponding positioning recessed hole 85, one end of the compression spring 108 forces on the inner end surface of the screw portion of the corresponding locking bolt 107, and the other end of the compression spring 108 presses against the corresponding ball 109, and the rotating portion of the locking bolt 107 presses against the front wall or rear wall of the corresponding gearbox body 100.

[0050] Furthermore, a sealing ring is embedded on the inner side wall of the rotating part of the locking bolt 107 , and the sealing ring is pressed against the corresponding front wall surface or rear wall surface of the gearbox body 100 .

[0051] Furthermore, a through hole is formed at the corresponding position of the gearbox body 100, and the gear control lever 90 is inserted into the through hole, and its bottom end extends into the gearbox body 100. A connecting seat 110 is fixed on the outer wall surface of the gearbox body 100 at the through hole. The middle part of the connecting seat 110 is formed with an inner cavity that runs through from top to bottom, and its upper inner wall is a spherical wall. The middle spherical body of the gear control lever 90 is in the inner cavity of the connecting seat 110, and the lower outer side wall of the middle spherical body is close to or close to the spherical wall. An elastic sealing block 111 is clamped in the top of the inner cavity of the connecting seat 110, and the top surface of the middle spherical body is pressed against the bottom surface of the elastic sealing block 111, and the upper part of the gear control lever 90 extends out of the top surface of the middle through hole of the elastic sealing block 111.

[0052] In this embodiment, the shift control lever 90 is used to control the shifting: the upper end of the shift control lever 90 is held by hand, and the initial position is that the outer fork ring 71 is in the middle position. At the same time, the ball 109 partially extends out of the inner end of the connecting through hole 106 and is located at the positioning recessed hole 85 in the middle of the right part of the corresponding transverse rod 80. When the eleventh gear 11 and the twelfth gear 12 need to be connected, the shift control lever 90 is controlled to be toggled, and the shift block 91 is moved forward and inserted into the slot 83 of the front extension portion 82, and then moved to the left, so that the front transverse rod 80 moves to the left, so that the arc-shaped toggle portion 72 connected thereto moves to the left. The outer fork ring body 71 moves to the left, so that the transition tooth portion 153 of the transition transmission sleeve 152 on the left first enters the transmission tooth groove on the left part of the outer fork ring body 71, and then continues to move to the left, and then the outer tooth portion of the corresponding left auxiliary transmission gear ring 15 is inserted into the transmission tooth groove on the left part of the outer fork ring body 71, thereby driving the left auxiliary transmission gear ring 15 to rotate, so that the eleventh gear 11 rotates, and at this time the moving position is just that the inner end of the ball 109 part extending out of the connecting through hole 106 moves to the rightmost positioning recessed hole 85 at the right part of the corresponding transverse rod 80, so as to achieve positioning;

[0053] Similarly, when moving to the right, it drives the corresponding right-side auxiliary transmission gear ring 15 to rotate, which drives the twelfth gear 12 to rotate. At this time, the moving position is exactly that the inner end of the ball 109 partially extends out of the connecting through hole 106 and moves to the leftmost positioning recess 85 of the right part of the corresponding horizontal rod 80 to achieve positioning.

[0054] When shifting gears is required, the outer fork ring body 71 needs to be placed in the middle position and then moved to change positions. This is a conventional shifting operation and will not be described in detail here.

[0055] When the ninth gear 9 and the tenth gear 10 need to be connected, the gear control lever 90 is controlled to move the shift block 91 backward and insert the entire block into the slot 83 of the rear extension portion 82, and then move left or right, as before, to drive the ninth gear 9 or the tenth gear 10 to rotate.

[0056] In this embodiment, the transition transmission sleeve 152 realizes an intermediate rotation transition effect, so that when the outer fork ring body 71 moves to the corresponding auxiliary transmission gear ring 15, the connection is more stable.

[0057] When the two transverse rods 80 move left and right, when the front transverse rod 80 moves, the rear end of the limiting rod 104 will be located in the first recessed hole 84 at the left portion of the rear transverse rod 80, and when the rear transverse rod 80 moves, the front end of the limiting rod 104 will be located in the first recessed hole 84 at the left portion of the front transverse rod 80, thereby achieving further limiting.

[0058] Furthermore, the dual clutch structure on the clutch shaft 30 is that a clutch outer hub 1020 is formed in the middle of the clutch shaft 30, and a clutch inner hub 1030 is formed on both the second gear 2 and the first gear 1. The two clutch inner hubs 1030 are located on both sides of the clutch outer hub 1020, and the clutch inner hub 1030 is inserted on the clutch shaft 30. A plurality of friction plates 1040 and spacers 1050 are arranged between the clutch inner hub 1030 and the clutch outer hub 1020, and the friction plates 1040 are meshed with the external teeth on the clutch inner hub 1030. The spacer 1050 is installed on the clutch outer hub 1020, and its external spline protrusion is inserted into the spline groove on the clutch outer hub 1020 and cooperates with the spline groove on the clutch outer hub 1020. The first pressure block 240 and the second pressure block 250 are inserted on the clutch shaft 30. The first pressure block 240 and the second pressure block 250 are located on both sides of the clutch outer hub 1020. The first pressure block 240 and the second pressure block 250 are facing the corresponding friction plate 1040 and the spacer 1050. The first pressure block 240 corresponds to the first gear 1, and the second pressure block 250 corresponds to the second gear 2.

[0059] The above-mentioned dual clutch structure and single clutch structure are the same as the existing wet clutch structure and will not be described in detail.

[0060] Gear shifting principle: forward first gear: the first pressure block 240 is pressed tightly so that the first gear 1 can rotate along with the clutch shaft 30, and the second pressure block 250 is released.

[0061] The clutch shaft 30 is driven to rotate by the turbine shaft 201 of the torque converter 20, so that the first gear 1 rotates, the first gear 1 drives the fifth gear 5 to rotate, the fifth gear 5 causes the second idler shaft 50 to rotate, and the eighth gear 8 rotates. At this time, the corresponding outer fork ring body 71 moves to the right, so that the twelfth gear 12 is connected to the front axle shift output shaft 60, and the eighth gear 8 drives the twelfth gear 12 to rotate, so that the front axle shift output shaft 60 rotates, so that the two front wheels can run, and because the thirteenth gear 13 and the fourteenth gear 14 are meshed, the front axle shift output shaft 60 rotates, driving the thirteenth gear 13 to rotate, and the thirteenth gear 13 drives the fourteenth gear 14 to rotate, so that the rear axle output shaft 900 rotates, so that the two rear wheels can run, realizing four-wheel drive operation.

[0062] Second forward gear: the first pressing block 240 is pressed, and the second pressing block 250 is released.

[0063] The clutch shaft 30 is driven to rotate by the turbine shaft 201 of the torque converter 20, so that the first gear 1 rotates, the first gear 1 drives the fifth gear 5 to rotate, the fifth gear 5 causes the second idler shaft 50 to rotate, and the seventh gear 7 rotates. At this time, the corresponding outer fork ring body 71 moves to the left, so that the eleventh gear 11 is connected to the front axle shift output shaft 60, and the seventh gear 7 drives the eleventh gear 11 to rotate, so that the front axle shift output shaft 60 rotates, so that the two front wheels can run, and because the thirteenth gear 13 and the fourteenth gear 14 are meshed, the front axle shift output shaft 60 rotates, driving the thirteenth gear 13 to rotate, and the thirteenth gear 13 drives the fourteenth gear 14 to rotate, so that the rear axle output shaft 900 rotates, so that the two rear wheels can run, realizing four-wheel drive operation.

[0064] Forward third gear: the first pressing block 240 is pressed tightly, and the second pressing block 250 is released.

[0065] The clutch shaft 30 is driven to rotate by the turbine shaft 201 of the torque converter 20, so that the first gear 1 rotates, the first gear 1 drives the fifth gear 5 to rotate, the fifth gear 5 causes the second idler shaft 50 to rotate, and the sixth gear 6 rotates. At this time, the corresponding outer fork ring body 71 moves to the right, so that the tenth gear 10 is connected to the front axle shift output shaft 60, the sixth gear 6 drives the tenth gear 10 to rotate, so that the front axle shift output shaft 60 rotates, so that the two front wheels can run, and because the thirteenth gear 13 and the fourteenth gear 14 are meshed, the front axle shift output shaft 60 rotates, driving the thirteenth gear 13 to rotate, the thirteenth gear 13 drives the fourteenth gear 14 to rotate, so that the rear axle output shaft 900 rotates, so that the two rear wheels can run, realizing four-wheel drive operation.

[0066] Fourth forward gear: the first pressing block 240 is pressed tightly, and the second pressing block 250 is released.

[0067] The clutch shaft 30 is driven to rotate by the turbine shaft 201 of the torque converter 20, so that the first gear 1 rotates, the first gear 1 drives the fifth gear 5 to rotate, and the fifth gear 5 causes the second idler shaft 50 to rotate. At this time, the corresponding outer fork ring 71 moves to the left, so that the ninth gear 9 is connected to the front axle shift output shaft 60, and the fifth gear 5 drives the ninth gear 9 to rotate, so that the front axle shift output shaft 60 rotates, so that the two front wheels can run, and because the thirteenth gear 13 and the fourteenth gear 14 are meshed, the front axle shift output shaft 60 rotates, driving the thirteenth gear 13 to rotate, and the thirteenth gear 13 drives the fourteenth gear 14 to rotate, so that the rear axle output shaft 900 rotates, so that the two rear wheels can run, realizing four-wheel drive operation.

[0068] Reverse gear 1: the first pressure block 240 is released, and the second pressure block 250 is pressed, so that the second gear 2 can rotate along with the clutch shaft 30 .

[0069] The clutch shaft 30 is driven to rotate by the turbine shaft 201 of the torque converter 20, so that the second gear 2 rotates, the second gear 2 drives the fourth gear 4 to rotate, the fourth gear 4 rotates the first idler shaft 40, so that the third gear 3 rotates, the third gear 3 drives the fifth gear 5 to rotate, the fifth gear 5 rotates the second idler shaft 50, so that the eighth gear 8 rotates, and at this time, the corresponding outer fork ring 71 moves to the right, so that the twelfth gear 12 is connected to the front axle shift output shaft 60, the eighth gear 8 drives the twelfth gear 12 to rotate, so that the front axle shift output shaft 60 rotates, so that the two front wheels can run, and because the thirteenth gear 13 and the fourteenth gear 14 are meshed, the front axle shift output shaft 60 rotates, driving the thirteenth gear 13 to rotate, the thirteenth gear 13 drives the fourteenth gear 14 to rotate, so that the rear axle output shaft 900 rotates, so that the two rear wheels can run, realizing four-wheel drive operation.

[0070] Reverse gear 2: the first pressing block 240 is released, and the second pressing block 250 is pressed.

[0071] The clutch shaft 30 is driven to rotate by the turbine shaft 201 of the torque converter 20, so that the second gear 2 rotates, the second gear 2 drives the fourth gear 4 to rotate, the fourth gear 4 rotates the first idler shaft 40, so that the third gear 3 rotates, the third gear 3 drives the fifth gear 5 to rotate, the fifth gear 5 rotates the second idler shaft 50, so that the seventh gear 8 rotates, and at this time, the corresponding outer fork ring 71 moves to the left, so that the eleventh gear 11 is connected to the front axle shift output shaft 60, the seventh gear 7 drives the eleventh gear 11 to rotate, so that the front axle shift output shaft 60 rotates, so that the two front wheels can run, and because the thirteenth gear 13 and the fourteenth gear 14 are meshed, the front axle shift output shaft 60 rotates, driving the thirteenth gear 13 to rotate, the thirteenth gear 13 drives the fourteenth gear 14 to rotate, so that the rear axle output shaft 900 rotates, so that the two rear wheels can run, realizing four-wheel drive operation.

[0072] Reverse gear 3: the first pressing block 240 is released, and the second pressing block 250 is pressed.

[0073] The clutch shaft 30 is driven to rotate by the turbine shaft 201 of the torque converter 20, so that the second gear 2 rotates, the second gear 2 drives the fourth gear 4 to rotate, the fourth gear 4 rotates the first idler shaft 40, so that the third gear 3 rotates, the third gear 3 drives the fifth gear 5 to rotate, the fifth gear 5 rotates the second idler shaft 50, so that the sixth gear 6 rotates, and at this time, the corresponding outer fork ring 71 moves to the right, so that the tenth gear 10 is connected to the front axle shift output shaft 60, the sixth gear 6 drives the tenth gear 10 to rotate, so that the front axle shift output shaft 60 rotates, so that the two front wheels can run, and because the thirteenth gear 13 and the fourteenth gear 14 are meshed, the front axle shift output shaft 60 rotates, driving the thirteenth gear 13 to rotate, the thirteenth gear 13 drives the fourteenth gear 14 to rotate, so that the rear axle output shaft 900 rotates, so that the two rear wheels can run, realizing four-wheel drive operation.

[0074] Reverse gear 4: the first pressing block 240 is released, and the second pressing block 250 is pressed.

[0075] The clutch shaft 30 is driven to rotate by the turbine shaft 201 of the torque converter 20, so that the second gear 2 rotates, the second gear 2 drives the fourth gear 4 to rotate, the fourth gear 4 rotates the first idler shaft 40, so that the third gear 3 rotates, the third gear 3 drives the fifth gear 5 to rotate, the fifth gear 5 rotates the second idler shaft 50, and at this time, the corresponding outer fork ring 71 moves to the left, so that the ninth gear 9 is connected to the front axle shift output shaft 60, the fifth gear 5 drives the ninth gear 9 to rotate, so that the front axle shift output shaft 60 rotates, so that the two front wheels can run, and because the thirteenth gear 13 and the fourteenth gear 14 are meshed, the front axle shift output shaft 60 rotates, driving the thirteenth gear 13 to rotate, the thirteenth gear 13 drives the fourteenth gear 14 to rotate, so that the rear axle output shaft 900 rotates, so that the two rear wheels can run, realizing four-wheel drive operation.

[0076] This embodiment adopts a manually controlled mechanical shifting structure and a wet clutch controlled reversing structure to realize four-speed forward and four-speed reverse, which makes it possible to change gears more frequently. In addition, only a dual-clutch structure is provided on the clutch shaft 30, and no wet clutch structure is installed on the rest of the gears. This greatly reduces its manufacturing cost, occupies less space, greatly reduces its volume, and facilitates installation.

[0077] Finally, the above implementation modes are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The scope of patent protection of the present invention should be defined by the claims.

Claims

1. A transmission with a compact structure, comprising a transmission case (100), a torque converter (20) being mounted on the outer side of the transmission case (100), a turbine shaft (201) of the torque converter (20) being connected to a clutch shaft (30) on the transmission case (100), characterized in that: The gearbox body (100) is provided with a clutch shaft (30), a first idler shaft (40), a second idler shaft (50), a front axle shift output shaft (60) and a rear axle output shaft (900); A first gear (1) and a second gear (2) are movably connected to the clutch shaft (30) via a bearing, a third gear (3) and a fourth gear (4) are fixed or formed on the first idler shaft (40), a fifth gear (5), a sixth gear (6), a seventh gear (7) and an eighth gear (8) are fixed or formed on the second idler shaft (50), a ninth gear (9), a tenth gear (10), an eleventh gear (11) and a twelfth gear (12) are movably connected to the front axle shift output shaft (60), a thirteenth gear (13) is also connected to the front axle shift output shaft (60) via a spline, and a fourteenth gear (14) is fixed or formed on the rear axle output shaft (900); The first gear (1) is meshed with the fifth gear (5), the second gear (2) is meshed with the fourth gear (4), the third gear (3) is meshed with the fifth gear (5), the fifth gear (5) is meshed with the ninth gear (9), the sixth gear (6) is meshed with the tenth gear (10), the seventh gear (7) is meshed with the eleventh gear (11), the eighth gear (8) is meshed with the twelfth gear (12), and the thirteenth gear (13) is meshed with the fourteenth gear (14).

2. A compact transmission according to claim 1, characterized in that: The output ends of the front axle shift output shaft (60) and the rear axle output shaft (900) both extend out of the gearbox body (100).

3. A compact transmission according to claim 1, characterized in that: Both ends of the clutch shaft (30), the first idler shaft (40), the second idler shaft (50), the front axle shift output shaft (60) and the rear axle output shaft (900) are movably connected to the side wall of the gearbox body (100) through bearings.

4. A compact transmission according to claim 1, characterized in that: A double clutch structure is installed on the clutch shaft (30).

5. A compact transmission according to claim 1, characterized in that: The front axle shift output shaft (60) is inserted into the central through holes of the ninth gear (9), the tenth gear (10), the eleventh gear (11) and the twelfth gear (12); the inner side walls of the central through holes of the ninth gear (9), the tenth gear (10), the eleventh gear (11) and the twelfth gear (12) are movably connected to the outer side wall of the front axle shift output shaft (60) via a needle roller cage assembly.

6. A compact transmission according to claim 5, characterized in that: A secondary transmission gear ring (15) is welded and fixed on the outer side wall of the side where the ninth gear (9) and the tenth gear (10) are close to each other, and a secondary transmission gear ring (15) is also welded and fixed on the outer side wall of the side where the eleventh gear (11) and the twelfth gear (12) are close to each other; An outer side wall of the front axle shift output shaft (60) between the two corresponding auxiliary transmission gear rings (15) on the left and right is formed with an external spline protrusion, and an inner side wall of the middle through hole of the middle transmission gear (70) is formed with a spline groove. The front axle shift output shaft (60) is inserted into the middle through hole of the middle transmission gear (70), and the external spline protrusion is inserted into and matched with the corresponding spline groove. The outer shift fork ring body (71) is inserted into and matched with the corresponding middle transmission gear (70). A toothed groove is formed in the middle of the inner side wall of the outer shift fork ring body (71), and the external toothed portion on the outer side wall of the corresponding middle transmission gear (70) is inserted into and matched with the toothed groove.

7. A compact transmission according to claim 6, characterized in that: An outer ring groove is formed in the middle of the outer side wall of the outer fork ring body (71), and the corresponding arc-shaped shifting portion (72) is inserted into the corresponding outer ring groove and matched with the outer ring groove, and the portion of the arc-shaped shifting portion (72) in the outer ring groove is greater than half of the outer ring groove.

8. A compact transmission according to claim 7, characterized in that: A connecting portion (73) is formed on each arc-shaped toggle portion (72), and a connecting sleeve (74) is formed on the connecting portion (73). Two transverse shafts (80) extending left and right and corresponding to each other are provided in the gearbox body (100) at one side corresponding to the front axle shift output shaft (60). The left end of the transverse shaft (80) is inserted into a left insertion hole (101) formed on the inner side wall of the left side plate of the gearbox body (100), and the right end of the transverse shaft (80) is inserted into a right insertion hole (102) formed on the inner side wall of the right side plate of the gearbox body (100). One of the connecting sleeves (74) is located on the transverse shaft (80) and fixed on the transverse shaft (80), and the other connecting sleeve (74) is located on the other transverse shaft (80) and fixed on this transverse shaft (80). A shifting sleeve (81) is fixed on each of the two transverse shafts (80), the two shifting sleeves (81) correspond to each other, the upper ends of the two shifting sleeves (81) are formed with an extension portion (82), the opposite wall surfaces of the two extension portions (82) are formed with a slot (83) near the middle thereof, a gear position control rod (90) is mounted on the gearbox body (100), a shifting block (91) is fixed or formed on the end of the gear position control rod (90), the shifting block (91) matches with the two slots (83), and the shifting block (91) is inserted into the two slots (83).

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