Gearbox structure for three-way forklift

By shifting the input connection axially forward in the transmission structure of a three-way forklift in a narrow tunnel, shortening the front and rear distance of the gearbox, the problem of too long rotary arm length caused by the transmission structure in the prior art is solved, and the rotation arm length is achieved The effect of shortening the steering radius and rotation range in smaller environments.

CN222476096UActive Publication Date: 2025-02-14ZHEJIANG ZHONGCHAI MACHINERY
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Patent Information

Application Number
CN202421263989.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-05
Publication Date
2025-02-14
Estimated Expiration
2034-06-05

AI Technical Summary

Technical Problem

The existing narrow lane three-way forklift gearbox structure results in the long front and rear distance of the gearbox at the lower part of the vehicle body where the front wheel is located, which cannot shorten the length of the rotating arm, and thus cannot shorten the steering radius and rotation range, limiting its in smaller environments. in steering operation capability.

Method used

By shifting the input connection axially forward, the front and rear distance of the entire transmission box is shortened, thereby reducing the length of the rotary arm in the forklift, shortening the steering radius and rotation range.

Benefits of technology

It achieves shortening the steering radius and rotation range in a smaller environment, suitable for steering operation in a smaller space, and improves the flexibility and operation convenience of the forklift.

✦ Generated by Eureka AI based on patent content.

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Abstract

The gearbox structure for the three-way forklift comprises a gearbox body, a differential mechanism is installed on the lower portion of an inner cavity of the gearbox body, and output through holes are formed in a left side plate and a right side plate of the front portion of the gearbox body. The left end and the right end of a differential mechanism shell of the differential mechanism are movably connected to the inner side walls of a left side plate and a right side plate on the front portion of a gearbox body through bearings, an annular gear is fixed to the outer wall face of the differential mechanism shell of the differential mechanism, and the inner end of a first half shaft and the inner end of a second half shaft are connected with a left half shaft gear and a right half shaft gear of the differential mechanism. The input connecting shaft shifts upwards and forwards, so that the whole gearbox body is shortened under the condition that transmission is guaranteed, the length of a rotating arm in a forklift can be reduced, a front forklift body is close to a rear forklift body, the steering radius is shortened, the rotating range is shortened, and the gearbox can be suitable for steering operation and use in a smaller environment.
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Description

Technical field:

[0001] The utility model relates to the technical field related to forklifts, and more specifically to a gearbox structure for a three-way forklift. Background technology:

[0002] Forklifts are industrial handling vehicles, which refer to various wheeled handling vehicles used for loading and unloading, stacking and short-distance transportation of palletized goods. Forklifts play a very important role in the logistics system of an enterprise and are the main force in material handling equipment.

[0003] The warehousing and logistics market is becoming more and more mature, and the core areas have higher and higher requirements for warehouse utilization. Narrow aisle three-way forklifts are born to meet this demand. Currently, the narrow aisle three-way forklifts used in the market;

[0004] The difference of this type of forklift is that the body where the front wheels are located can achieve three-way rotation, while the body where the rear wheels are located does not rotate, but drives the body where the front wheels are located to rotate. The body where the rear wheels are located is provided with a directional rotation structure, and the front part of the rotating arm of the mechanism is installed above the body where the front wheels are located. The turning of the body where the front wheels are located is achieved by rotating the rotating arm. Therefore, in order to ensure that it turns in the smallest possible range, it is necessary to shorten the length of the rotating arm. To shorten the length of the rotating arm, the rear part of the body where the front wheels are located must be close to the body where the rear wheels are located to reduce the turning radius. However, an existing problem is that the front-to-back distance of the gearbox at the lower part of the body where the front wheels are located is long, and its rear part extends out of the rear end of the front body. Figure 1 As shown, if it is necessary to ensure that it does not contact the rear vehicle body when rotating, the only way is to increase the rotating arm and increase the distance between the front vehicle body and the rear vehicle body. This will not shorten the turning radius and reduce the rotation range. Utility model content:

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a gearbox structure for a three-way forklift, which shifts the input connecting shaft upward and forward, so that the entire gearbox case can be shortened while ensuring transmission, thereby reducing the length of the rotating arm in the forklift, making the front body close to the rear body, shortening the turning radius, shortening the turning range, and being suitable for steering operation in a smaller environment.

[0006] The solution of the utility model to solve the technical problem is:

[0007] A gearbox structure for a three-way forklift, comprising a gearbox case, a differential is installed at the lower part of the internal cavity of the gearbox case, output through holes are formed on the left and right plates of the front part of the gearbox case, the left and right ends of the differential housing of the differential are movably connected to the inner side walls of the left and right plates of the front part of the gearbox case through bearings, a ring gear is fixed on the outer wall surface of the differential housing of the differential, and the inner ends of the first half shaft and the second half shaft are connected to the left and right half shaft gears of the differential;

[0008] The outer ends of the first half shaft and the second half shaft are both fixed with connecting hubs;

[0009] An intermediate rotating shaft is provided in the middle of the gearbox housing, and two ends of the intermediate rotating shaft are movably connected to the inner side walls of the left and right plates of the gearbox housing through bearings. A first transmission tooth portion and a second transmission gear are formed or fixed on the intermediate rotating shaft, and the first transmission tooth portion is meshed with the ring gear. An input connecting shaft is movably connected to the upper rear portion of the gearbox housing through bearings, and a third transmission tooth portion is formed or fixed on the outer side wall of the input connecting shaft, and the third transmission tooth portion is meshed with the second transmission gear.

[0010] The input connecting shaft is located obliquely behind the differential.

[0011] Compared with the existing gearbox, the input connecting shaft is arranged forward and upward, so that the central axis thereof is on the same oblique plane as the central axis of the first semi-shaft or the second semi-shaft, which reduces the distance between the vertical planes where the two are located, thereby shortening the front-to-back distance of the entire gearbox. The gearbox is installed on the front body of the forklift so that the rear end of the gearbox does not extend out of the front body, and the rear end of the front body can be close to the rear body, thereby shortening the length of the rotating arm, reducing the rotating radius, and reducing the rotating range, making it convenient to turn and operate in a smaller environment.

[0012] The right end and the left part of the input connecting shaft are movably connected to the inner wall of the left side plate or the right side plate of the gearbox case through bearings, the left end of the input connecting shaft extends out of the middle through hole of the left side plate of the gearbox case, and a connecting spline hole is formed in the middle of the left end of the input connecting shaft.

[0013] A motor connecting flange extending to the left is formed on the upper portion of the left side plate of the gearbox housing.

[0014] The outstanding effects of the utility model are:

[0015] It offsets the input connecting shaft upward and forward, thereby shortening the front-to-back distance of the entire gearbox case while ensuring transmission, thereby reducing the length of the rotating arm in the forklift, bringing the front body closer to the rear body, shortening the turning radius, shortening the turning range, and being suitable for steering operation in a smaller environment. Description of the drawings:

[0016] Figure 1 It is a structural schematic diagram of an existing gearbox;

[0017] Figure 2 is a side view of an existing gearbox;

[0018] Figure 3 It is a partial structural schematic diagram of the gearbox of the utility model;

[0019] Figure 4 It is a partial side view of the utility model;

[0020] Figure 5 It is a partial structural schematic diagram of the utility model installed on a three-way forklift;

[0021] Figure 6 yes Figure 5 Schematic diagram of the local structure of changing angle. Specific implementation method:

[0022] For example, see Figures 3 to 6 As shown, a gearbox structure for a three-way forklift includes a gearbox case 10, a differential 20 is installed at the lower part of the internal cavity of the gearbox case 10, and the differential 20 is the same as the existing commonly used differential 20, which will not be described in detail here; the left and right plates of the front part of the gearbox case 10 are both formed with output through holes 11, and the left and right ends of the differential housing of the differential 20 are both movably connected to the inner side walls of the left and right plates of the front part of the gearbox case 10 through bearings, and a ring gear 210 is fixed to the annular portion formed on the outer wall surface of the differential housing of the differential 20 by bolts, and the inner ends of the first half shaft 1 and the second half shaft 2 extend into the through holes at the left and right ends of the differential housing and are connected to the left and right half shaft gears of the differential 20, and the splines formed on the outer side walls of the inner ends of the first half shaft 1 and the second half shaft 2 are inserted into the central spline holes of the left and right half shaft gears of the differential 20 and matched with the corresponding spline holes;

[0023] The outer ends of the first half-shaft 1 and the second half-shaft 2 are both fixed with connecting hubs 3; the connecting hubs 3 are directly connected to the front wheels of the front body of the forklift;

[0024] An intermediate rotating shaft 12 is provided in the middle of the gearbox housing 10, and the two ends of the intermediate rotating shaft 12 are movably connected to the inner side walls of the left and right plates of the gearbox housing 10 through bearings. A first transmission tooth portion 13 is formed on the intermediate rotating shaft 12 (i.e., an outer wall of the intermediate rotating shaft 12 is formed with an outer tooth portion, and the outer tooth portion is the first transmission tooth portion 13) and a second transmission gear 14 is fixed thereto, and the first transmission tooth portion 13 is meshed with the ring gear 210. An input connecting shaft 15 is movably connected to the upper rear portion of the gearbox housing 10 through bearings, and a third transmission tooth portion 16 is formed on the outer wall of the input connecting shaft 15 (i.e., an outer wall of the input connecting shaft 15 is formed with an outer tooth portion, and the outer tooth portion is the third transmission tooth portion 16), and the third transmission tooth portion 16 is meshed with the second transmission gear 14;

[0025] The input connecting shaft 15 is located obliquely behind the differential 20. The central axis of the input connecting shaft 15 is located above and behind the central axis of the first half shaft 1 or the second half shaft 2 (the central axes of the first half shaft 1 or the second half shaft 2 coincide with each other).

[0026] The central axis of the intermediate rotating shaft 12 is located in an oblique plane formed between the central axis of the input connecting shaft 15 and the central axis of the first semi-shaft 1 or the second semi-shaft 2 .

[0027] That is, the central axis of the intermediate shaft 12, the central axis of the input connecting shaft 15 and the central axis of the first semi-shaft 1 or the second semi-shaft 2 are on the same inclined plane. Figure 1 and 2 Compared with the existing gearbox shown in FIG. 1 , the distance between the central axis of the input connecting shaft 15 and the central axis of the first half-shaft 1 or the second half-shaft 2 is smaller than the distance between the input shaft and the half-shaft of the existing gearbox (such as Figure 2 and Figure 4 It can be seen from the measured value that this value is only an example and does not limit its distance). Therefore, the length of the rotating arm 100 of the three-way forklift using this embodiment can be shortened, thereby reducing the turning radius of the front body of the three-way forklift and shortening the turning range, which can be suitable for steering operation in a smaller environment.

[0028] Furthermore, the right end and the left part of the input connecting shaft 15 are movably connected to the inner wall of the left side plate or the right side plate of the gearbox case 10 through bearings, and the left end of the input connecting shaft 15 extends out of the middle through hole of the left side plate of the gearbox case 10, and a connecting spline hole is formed in the middle of the left end of the input connecting shaft 15.

[0029] The upper part of the left side plate of the gearbox housing 10 is formed with a motor connecting flange 17 extending to the left, which can fix the motor on the motor connecting flange 17, and extend the output shaft of the motor into the connecting spline hole of the input connecting shaft 15, and the outer side wall of the output shaft of the motor is formed with a spline protrusion, which cooperates with the spline groove of the connecting spline hole.

[0030] Furthermore, an extension sleeve portion 18 is formed on the outer side wall of the right side plate of the front part of the gearbox housing 10, the right end of the right side output through hole 11 extends out of the right end surface of the extension sleeve portion 18, the second half shaft 2 is inserted into the extension sleeve portion 18, and the right end of the second half shaft 2 extends out of the extension sleeve portion 18.

[0031] Furthermore, an outer connecting sleeve 19 is formed on the outer side wall of the left side plate of the front part of the gearbox housing 10, and the output through hole 11 on the left side is in communication with the outer connecting sleeve 19. The right end of the half-axle outer casing 30 is inserted into the outer connecting sleeve 19 and fixedly connected to the outer connecting sleeve 19 by bolts. The right end outer side wall of the half-axle outer casing 30 is in close contact with the inner side wall of the outer connecting sleeve 19. The first half-axle 1 is inserted into the outer connecting sleeve 19 and the half-axle outer casing 30, and the left end of the first half-axle 1 extends out of the left end of the half-axle outer casing 30. As shown in the drawings, with this structure, the gearbox housing 10 is not located in the middle between the two connecting hubs 3, so that when the embodiment is installed on the front body of the three-way forklift, it can be staggered with the components installed in the middle of the top surface of the body, and will not have any impact.

[0032] Furthermore, a radially extending edge 31 is formed on the left outer wall of the half-shaft outer casing 30, a fan-shaped connecting plate 32 is fixed on the radially extending edge 31, and the half-shaft outer casing 30 is inserted into a slot formed in the middle of the rear wall of the fan-shaped connecting plate 32.

[0033] The fan-shaped connecting plate 32 can be fixed on the mounting top plate of the front body of the three-way forklift to achieve connection. Since the distance between the central axis of the input connecting shaft 15 and the central axis of the first half-shaft 1 or the second half-shaft 2 in this embodiment is smaller than the distance between the input shaft and the half-shaft of the existing gearbox, the front body of the three-way forklift can be moved backwards closer to the rear body, so that the length of the steering arm connecting the rear body and the front body can be shortened, thereby reducing the turning radius of the front body of the three-way forklift and shortening the turning range, so that it can be suitable for steering operation in a smaller environment.

Claims

1. A gearbox structure for a three-way forklift, comprising a gearbox housing (10), wherein a differential (20) is installed at the lower part of the internal cavity of the gearbox housing (10), characterized in that: The left and right front plates of the gearbox housing (10) are both formed with output through holes (11); the left and right ends of the differential housing of the differential (20) are both movably connected to the inner side walls of the left and right front plates of the gearbox housing (10) through bearings; a ring gear (210) is fixed to the outer wall surface of the differential housing of the differential (20); and the inner ends of the first half shaft (1) and the second half shaft (2) are connected to the left and right half shaft gears of the differential (20); The outer ends of the first half-shaft (1) and the second half-shaft (2) are both fixed with connecting hubs (3); An intermediate rotating shaft (12) is provided in the middle of the gearbox housing (10), and the two ends of the intermediate rotating shaft (12) are movably connected to the inner side walls of the left and right plates of the gearbox housing (10) through bearings. A first transmission tooth portion (13) and a second transmission gear (14) are formed or fixed on the intermediate rotating shaft (12), and the first transmission tooth portion (13) is meshed with the ring gear (210). An input connecting shaft (15) is movably connected to the upper rear portion of the gearbox housing (10) through bearings, and a third transmission tooth portion (16) is formed or fixed on the outer side wall of the input connecting shaft (15), and the third transmission tooth portion (16) is meshed with the second transmission gear (14); The input connecting shaft (15) is located obliquely behind the differential (20).

2. A gearbox structure for a three-way forklift according to claim 1, characterized in that: The central axis of the input connecting shaft (15) is located above and behind the central axis of the first half shaft (1) or the second half shaft (2).

3. A gearbox structure for a three-way forklift according to claim 2, characterized in that: The central axis of the intermediate rotating shaft (12) is located in an oblique plane formed between the central axis of the input connecting shaft (15) and the central axis of the first semi-shaft (1) or the second semi-shaft (2).

4. The gearbox structure for a three-way forklift according to claim 1, characterized in that: The right end and the left part of the input connecting shaft (15) are movably connected to the inner wall of the left side plate or the right side plate of the gearbox housing (10) through bearings, the left end of the input connecting shaft (15) extends out of the middle through hole of the left side plate of the gearbox housing (10), and a connecting spline hole is formed in the middle of the left end of the input connecting shaft (15).

5. The gearbox structure for a three-way forklift according to claim 4, characterized in that: A motor connecting flange (17) extending to the left is formed on the upper portion of the left side plate of the gearbox housing (10).

6. The gearbox structure for a three-way forklift according to claim 1, characterized in that: An extension sleeve portion (18) is formed on the outer side wall of the right side plate of the front part of the gearbox housing (10); the right end of the right output through hole (11) extends out of the right end surface of the extension sleeve portion (18); the second half shaft (2) is inserted into the extension sleeve portion (18); and the right end of the second half shaft (2) extends out of the extension sleeve portion (18).

7. The gearbox structure for a three-way forklift according to claim 1, characterized in that: An outer connecting sleeve (19) is formed on the outer side wall of the left side plate of the front part of the gearbox housing (10); the output through hole (11) on the left side is in communication with the outer connecting sleeve (19); the right end of the half-shaft outer casing (30) is inserted into the outer connecting sleeve (19) and is fixedly connected to the outer connecting sleeve (19) by bolts; the outer side wall of the right end of the half-shaft outer casing (30) is tightly attached to the inner side wall of the outer connecting sleeve (19); the first half-shaft (1) is inserted into the outer connecting sleeve (19) and the half-shaft outer casing (30); and the left end of the first half-shaft (1) extends out of the left end of the half-shaft outer casing (30).

8. The gearbox structure for a three-way forklift according to claim 7, characterized in that: A radially extending edge (31) is formed on the left outer side wall of the half-axle outer casing (30), a fan-shaped connecting plate (32) is fixed on the radially extending edge (31), and the half-axle outer casing (30) is inserted into a slot formed in the middle of the rear wall of the fan-shaped connecting plate (32).