Six-gear helical tooth gearbox for light truck

Abstract

The invention relates to a six-gear helical-tooth gearbox for a light truck. The six-gear helical-tooth gearbox is used for solving the problems that in the prior art, a gearbox is insufficient in bearing capacity, gear abrasion is fast, and noise is large. The invention provides a six-gear helical tooth gearbox for a light truck. The six-gear helical tooth gearbox comprises a shell assembly, an input shaft assembly, an output shaft assembly, two intermediate shaft assemblies and a synchronizer assembly. The input shaft assembly comprises an input shaft and an input gear arranged on the input shaft. The intermediate shaft assembly comprises an intermediate shaft, an input end intermediate gear and six gear-shifting intermediate gears, wherein the input end intermediate gear and the six gear-shifting intermediate gears are arranged on the intermediate shaft. The output shaft assembly comprises an output shaft and six output gears arranged on the output shaft. The output gear is arranged on the output shaft in a floating mode; and the two corresponding intermediate gears in the two intermediate shaft assemblies are respectively meshed with the corresponding output gears and support the floating output gears.

Description

Technical Field

[0001] The invention relates to a gearbox, in particular to a six-speed helical gearbox for a light truck. Background Art

[0002] At present, the transmissions of light trucks at home and abroad generally adopt the "thin and high teeth" design, which is suitable for conventional working conditions, but has certain limitations in terms of load capacity and durability. As the application environment of light trucks becomes increasingly complex, the requirements for transmissions are not limited to smooth shifting, but also include improved load capacity, lower noise level and smaller gear loss.

[0003] The Chinese patent application publication number CN104373514A discloses a dual intermediate shaft transmission with axial self-adaptation using a helical gear transmission structure, comprising a main box input shaft, a main shaft, a main box intermediate shaft and a sub-box intermediate shaft, an output shaft and a transmission case, wherein the transmission case comprises a main box and a sub-box, wherein the splined side of the main box input shaft is mounted in the main box through a bearing, and the spline of the input shaft is sleeved with a constant meshing helical tooth that meshes with the helical tooth on the main box intermediate shaft, the main shaft is mounted in the main box through a bearing and a support hole at the spline end of the input shaft, and the main box intermediate shaft is also mounted in the main box through a bearing, and the helical teeth of each gear position fastened on the main box intermediate shaft are respectively meshed with the floating helical teeth on the main shaft; the helical teeth sleeved on the spline at the rear end of the main shaft are the driving teeth of the sub-box, meshing with the large helical teeth on the sub-box intermediate shaft, and the other helical teeth of the sub-box intermediate shaft are meshed with the low-speed helical teeth on the output shaft of the sub-box. The dual intermediate shaft transmission has the characteristics of increasing the service life of the synchronizer, good shifting quality and low shifting noise.

[0004] The shortcomings of the above-mentioned prior art are: the gearbox housing design adopts a main box and auxiliary box mode, which has a complex structure; the gears adopt a traditional "thin high tooth" structure, which is not conducive to use under heavy load and high-intensity working conditions. Summary of the invention

[0005] The purpose of the present invention is to provide a six-speed helical gearbox for light trucks, which solves the problems of insufficient load-bearing capacity and rapid gear wear in the prior art by improving the gear structure and the transmission layout.

[0006] To achieve the above objectives, the technical solutions provided by the present invention are as follows:

[0007] A six-speed helical gearbox for light trucks, which is special in that it includes a housing assembly, an input shaft assembly, an output shaft assembly, two intermediate shaft assemblies symmetrically arranged relative to the output shaft assembly, and a synchronizer assembly; the housing assembly includes a clutch housing, a transmission housing, a rear cover housing, and an output bearing cover connected in sequence; the input shaft assembly includes an input shaft and an input gear arranged on the input shaft; the input shaft passes through the center of the clutch housing, one end of which extends out of the clutch housing, and the other end of which is rotatably mounted on the inner end surface of the clutch housing and extends into the transmission housing; the intermediate shaft assembly includes an intermediate shaft, an input-end intermediate gear and six output bearing caps arranged in sequence on the intermediate shaft The intermediate gear at the input end is meshed with the input gear; one end of the intermediate shaft is rotatably mounted on the inner end surface of the clutch housing, and the other end is rotatably mounted on the rear cover housing; the output shaft assembly includes an output shaft and six output gears arranged on the output shaft; one end of the output shaft is rotatably connected to one end of the input shaft, and the other end is rotatably mounted on the rear cover housing; the output gear is arranged on the output shaft in a floating manner; the corresponding two shift intermediate gears in the two intermediate shaft assemblies are respectively meshed with the corresponding output gears and support the floating output gear; the synchronizer assembly is used to switch the connection relationship between different output gears and the output shaft; the intermediate gears and the output gears are both helical teeth.

[0008] Further, the shift intermediate gears on the intermediate shaft include a first intermediate gear, a second intermediate gear, a third intermediate gear, a fourth intermediate gear, a fifth intermediate gear, and a sixth intermediate gear; the output gears on the output shaft include a first output gear, a second output gear, a third output gear, a fourth output gear, a fifth output gear, and a sixth output gear, which are meshed with the six shift intermediate gears one by one; the first synchronizer includes a first left ring gear, a first sleeve, and a first right ring gear; the second synchronizer includes a second left ring gear, a second sleeve, and a second right ring gear; the third synchronizer includes a third left ring gear, a third sleeve, and a third right ring gear; the fourth synchronizer includes a fourth sleeve and a fourth right gear; the sleeves are all mounted on the output shaft; the first left ring gear is mounted on the input gear, and the first right ring gear is mounted on the first output gear; the second left ring gear is mounted on the second output gear, and the second right ring gear is mounted on the third output gear; the third left ring gear is mounted on the fourth output gear, and the third right ring gear is mounted on the fifth output gear; the fourth right ring gear is mounted on the sixth output gear.

[0009] Further, the input shaft, input gear, first left ring gear, first sleeve, and output shaft constitute a six-speed structure; the input shaft, input gear, input-end intermediate gear, intermediate shaft, first intermediate gear, first output gear, first sleeve, first right ring gear, and output shaft constitute a five-speed structure; the input shaft, input gear, input-end intermediate gear, intermediate shaft, second intermediate gear, second output gear, second left ring gear, second sleeve, and output shaft constitute a four-speed structure; the input shaft, input gear, input-end intermediate gear, intermediate shaft, third intermediate gear, third output gear, second The right ring gear, the second sliding sleeve, and the output shaft constitute a third gear structure; the input shaft, the input gear, the input-end intermediate gear, the intermediate shaft, the fourth intermediate gear, the fourth output gear, the third left ring gear, the third sliding sleeve, and the output shaft constitute a second gear structure; the input shaft, the input gear, the input-end intermediate gear, the intermediate shaft, the fifth intermediate gear, the fifth output gear, the third right ring gear, the third sliding sleeve, and the output shaft constitute a first gear structure; the input shaft, the input gear, the input-end intermediate gear, the intermediate shaft, the sixth intermediate gear, the sixth output gear, the fourth right ring gear, the fourth sliding sleeve, and the output shaft constitute a reverse gear structure.

[0010] Furthermore, the housing assembly also includes an output bearing cover arranged on the rear cover housing.

[0011] Furthermore, both ends of the two intermediate shafts are respectively mounted on the inner end surface of the clutch housing and the outer end surface of the rear cover housing through cylindrical roller bearings.

[0012] Furthermore, the input shaft and the output shaft are respectively installed by means of four-point positioning bearings to offset part of the axial force of the input shaft and the output shaft; the four-point positioning bearings are deep groove ball bearings.

[0013] Furthermore, the transmission housing is a die-cast barrel-type structure, which improves the sealing and load-bearing capacity of the transmission assembly.

[0014] Beneficial effects of the present invention:

[0015] 1. The present invention provides a six-speed helical gearbox for light trucks, wherein both the intermediate gear and the output gear adopt coarse helical teeth, and a floating structure is designed between the output gear and the output shaft, which significantly enhances the bearing capacity of the gear, reduces gear wear, and can be used in working conditions with higher loads. At the same time, the helical gear design helps to reduce the meshing noise of the gears and improve the comfort during use.

[0016] 2. The present invention provides a six-speed helical gearbox for a light truck, wherein the housing assembly adopts a three-section core barrel structure, so that the design improves the sealing and load-bearing capacity of the transmission while simplifying the structural design and assembly process.

[0017] 3. The six-speed helical gearbox for light trucks provided by the present invention adopts a four-point positioning bearing to offset part of the axial force of the input shaft and the output shaft, thereby ensuring the stability and reliability of the gear transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an embodiment of a six-speed helical gearbox for a light truck according to the present invention;

[0019] Figure 2 This is a schematic structural diagram of a six-speed helical gearbox embodiment for a light truck of the present invention, in which the output shaft and the output gear are in a floating manner;

[0020] Figure 3 The present invention is a schematic diagram of a three-stage core barrel structure of a six-speed helical gearbox for a light truck.

[0021] The accompanying drawings are marked as follows: 1-clutch housing, 2-transmission housing, 3-rear cover housing, 4-output bearing cover, 5-input shaft, 51 input gear, 6-intermediate shaft, 60-input end intermediate gear, 61-first intermediate gear, 62-second intermediate gear, 63-third intermediate gear, 64-fourth intermediate gear, 65-fifth intermediate gear, 66-sixth intermediate gear, 7-output shaft, 71-first output gear, 72-second output gear, 73-third output gear, 74-fourth output gear, 75-fifth output gear, 76-sixth output gear, 81-first left ring gear, 82-first sleeve, 83-first right ring gear; 84-second left ring gear, 85-second sleeve, 86-second right ring gear, 87-third left ring gear, 88-third sleeve, 89-third right ring gear, 810-fourth sleeve, 811-fourth right ring gear, 9-cylindrical roller bearing, 10-deep groove ball bearing. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 As shown, the present invention provides a six-speed helical gearbox for a light truck, comprising a housing assembly, an input shaft assembly, two intermediate shaft assemblies, an output shaft assembly and a synchronizer assembly.

[0024] like Figure 1 and 3As shown, the housing assembly adopts a three-section structure, specifically including a clutch housing 1, a transmission housing 2, and a rear cover housing 3 connected in sequence. This structure simplifies the overall assembly process of the transmission and reduces the manufacturing cost. Among them, the transmission housing 2 adopts a die-cast barrel structure. This structural design not only improves the sealing of the transmission, prevents external dust and moisture from entering the transmission, affecting the normal operation of the gears and the life of the transmission, but also significantly enhances the bearing capacity of the transmission, enabling it to better adapt to high-load conditions. In addition, an output bearing cover 4 is connected to one side of the rear cover housing 3 to protect the output shaft 7.

[0025] The input shaft assembly includes an input shaft 5 and an input gear 51 disposed on the input shaft 5. The input shaft 5 passes through the center of the clutch housing 1, and both ends extend out of the clutch housing 1. The end close to the transmission housing 2 is mounted on the clutch housing 1 through a deep groove ball bearing 10, and the end thereof is located in the transmission housing 2. The use of the deep groove ball bearing 10 provides good stability and reliability, and is particularly suitable for gear transmission under high speed conditions.

[0026] The intermediate shaft assembly includes an intermediate shaft 6 and an input-end intermediate gear 60, a first intermediate gear 61, a second intermediate gear 62, a third intermediate gear 63, a fourth intermediate gear 64, a fifth intermediate gear 65, and a sixth intermediate gear 66 which are sequentially arranged on the intermediate shaft 6. The two intermediate shafts 6 are symmetrically mounted on both sides of the output shaft 7, one end of which is mounted on the inner end surface of the clutch housing 1 through a cylindrical roller bearing 9, and the other end is mounted on the end surface of the rear cover housing 3 through a cylindrical roller bearing 9. The cylindrical roller bearing 9 has a good load-bearing capacity and is suitable for use under high load conditions.

[0027] The output shaft assembly includes an output shaft 7 and a first output gear 71, a second output gear 72, a third output gear 73, a fourth output gear 74, a fifth output gear 75, and a sixth output gear 76 arranged on the output shaft 7 in sequence. These output gears are all designed with coarse helical teeth and mesh with the intermediate gears on the intermediate shaft. Figure 2 As shown in the area indicated by A, the six output gears and the output shaft 7 are all floating. This design can ensure that when working at high speed, the gears will not overheat or wear due to excessive friction, thereby extending the service life. At the same time, the helical gear design also helps to reduce the meshing noise of the gears and improve the comfort during use.

[0028] The synchronizer assembly includes a first synchronizer, a second synchronizer, a third synchronizer, and a fourth synchronizer, each of which includes a left ring gear, a sliding sleeve, and a right ring gear (the fourth synchronizer does not have a left ring gear). The sliding sleeves of the synchronizers are all installed on the output shaft 7, the first left ring gear 81 is installed on the input gear 51, and the remaining ring gears are installed on the corresponding output gears. The left and right ring gears are symmetrically arranged on both sides of the corresponding sliding sleeves. Such a design ensures the stability and reliability of the gearbox during the gear shifting process.

[0029] In this embodiment, the input-end intermediate gears 60 installed on the two intermediate shafts 6 are meshed with the input gears 51, and the remaining twelve intermediate gears on the two intermediate shafts 6 are grouped in pairs, and are meshed with the corresponding six output gears and support the output shaft gears. Through such gear configuration and meshing mode, the six-speed shifting function of the gearbox is realized, and due to the helical tooth design, the gear load capacity is significantly enhanced, and it can be used in higher load conditions.

Claims

1. A six-speed helical gearbox for a light truck, characterized in that: It includes a housing assembly, an input shaft assembly, an output shaft assembly, two intermediate shaft assemblies symmetrically arranged relative to the output shaft assembly, and a synchronizer assembly; The housing assembly comprises a clutch housing (1), a transmission housing (2), and a rear cover housing (3) which are connected in sequence; The input shaft assembly comprises an input shaft (5) and an input gear (51) arranged on the input shaft (5); the input shaft (5) passes through the center position of the clutch housing (1), one end of which extends out of the clutch housing (1), and the other end of which is rotatably mounted on the inner end surface of the clutch housing (1) and extends into the transmission housing (2); The intermediate shaft assembly comprises an intermediate shaft (6), and an input-end intermediate gear (60) and six shift intermediate gears which are sequentially arranged on the intermediate shaft (6); The input-end intermediate gear (60) meshes with the input gear (51); one end of the intermediate shaft (6) is rotatably mounted on the inner end surface of the clutch housing (1), and the other end is rotatably mounted on the rear cover housing (3); The output shaft assembly comprises an output shaft (7) and six output gears arranged on the output shaft (7); one end of the output shaft (7) is rotatably connected to one end of the input shaft (5), and the other end of the output shaft (7) is rotatably mounted on the rear cover housing (3); the six output gears are arranged on the output shaft (7) in a floating manner; two shifting intermediate gears symmetrically arranged in the two intermediate shaft assemblies are respectively meshed with corresponding output gears and support the floating output gears; The synchronizer assembly is used to switch the connection relationship between different output gears and the output shaft; The intermediate gear and the output gear are both helical gears.

2. A six-speed helical gearbox for a light truck according to claim 1, characterized in that: The shifting intermediate gears on the intermediate shaft (6) include a first intermediate gear (61), a second intermediate gear (62), a third intermediate gear (63), a fourth intermediate gear (64), a fifth intermediate gear (65), and a sixth intermediate gear (66); The output gears on the output shaft (7) include a first output gear (71), a second output gear (72), a third output gear (73), a fourth output gear (74), a fifth output gear (75), and a sixth output gear (76) which are respectively meshed with the six shift intermediate gears in a one-to-one correspondence; The first synchronizer includes a first left ring gear (81), a first sliding sleeve (82), and a first right ring gear (83); the second synchronizer includes a second left ring gear (84), a second sliding sleeve (85), and a second right ring gear (86); the third synchronizer includes a third left ring gear (87), a third sliding sleeve (88), and a third right ring gear (89); the fourth synchronizer includes a fourth sliding sleeve (810) and a fourth right ring gear (811); The sliding sleeves are all mounted on the output shaft (7); The first left ring gear (81) is mounted on the input gear (51), and the first right ring gear (83) is mounted on the first output gear (71); the second left ring gear (84) is mounted on the second output gear (72), and the second right ring gear (86) is mounted on the third output gear (73); the third left ring gear (87) is mounted on the fourth output gear (74), and the third right ring gear (89) is mounted on the fifth output gear (75); and the fourth right ring gear (811) is mounted on the sixth output gear (76).

3. A six-speed helical gearbox for a light truck according to claim 2, characterized in that: The input shaft (5), the input gear (51), the first left ring gear (81), the first sliding sleeve (82), and the output shaft (7) form a six-gear structure; The input shaft (5), the input gear (51), the input-end intermediate gear (60), the intermediate shaft (6), the first intermediate gear (61), the first output gear (71), the first sliding sleeve (82), the first right ring gear (83), and the output shaft (7) form a five-speed structure; The input shaft (5), the input gear (51), the input-end intermediate gear (60), the intermediate shaft (6), the second intermediate gear (62), the second output gear (72), the second left ring gear (84), the second sliding sleeve (85), and the output shaft (7) form a four-gear structure; The input shaft (5), the input gear (51), the input-end intermediate gear (60), the intermediate shaft (6), the third intermediate gear (63), the third output gear (73), the second right ring gear (86), the second sliding sleeve (85), and the output shaft (7) form a three-gear structure; The input shaft (5), the input gear (51), the input-end intermediate gear (60), the intermediate shaft (6), the fourth intermediate gear (64), the fourth output gear (74), the third left ring gear (87), the third sliding sleeve (88), and the output shaft (7) form a second-gear structure; The input shaft (5), the input gear (51), the input-end intermediate gear (60), the intermediate shaft (6), the fifth intermediate gear (65), the fifth output gear (75), the third right ring gear (89), the third sliding sleeve (88), and the output shaft (7) form a first gear structure; The input shaft (5), the input gear (51), the input-end intermediate gear (60), the intermediate shaft (6), the sixth intermediate gear (66), the sixth output gear (76), the fourth right ring gear (811), the fourth sliding sleeve (810), and the output shaft (7) constitute a reverse gear structure.

4. A six-speed helical gearbox for a light truck according to claim 3, characterized in that: The housing assembly further comprises an output bearing cover (4) arranged on the rear cover housing (3).

5. A six-speed helical gearbox for a light truck according to claim 1, characterized in that: The two ends of the two intermediate shafts (6) are respectively mounted on the inner end surface of the clutch housing (1) and the outer end surface of the rear cover housing (3) through cylindrical roller bearings (9).

6. A six-speed helical gearbox for a light truck according to claim 5, characterized in that: The input shaft (5) and the output shaft (7) are installed in a four-point positioning bearing manner, which is used to offset part of the axial force of the input shaft (5) and the output shaft (7).

7. A six-speed helical gearbox for a light truck according to claim 6, characterized in that: The four-point positioning bearing adopts a deep groove ball bearing (10).

8. A six-speed helical gearbox for a light truck according to claim 1, characterized in that: The transmission housing (3) is a die-cast cylindrical structure, and is used to improve the sealing performance and load-bearing capacity of the transmission assembly.

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