All-terrain fork truck and its two-speed four-wheel drive transmission

Abstract

The utility model discloses cross country fork truck and two gear four drive gearbox thereof, including gearbox body and input shaft assembly, intermediate shaft assembly, rear output assembly and front output assembly. In the scheme, power is transmitted to input shaft assembly through motor, power is transmitted to intermediate shaft assembly through input shaft assembly, power is respectively transmitted to fifth gear and sixth gear through fourth gear and second gear on intermediate shaft assembly, power is transmitted to differential assembly on sixth gear through bevel gear, and power is output by differential assembly, power is transmitted to rear output shaft through third clutch on fifth gear and is output power through the output flange of being installed on the upper, the gear shifting of vehicle is realized through first clutch on input shaft assembly and second clutch on intermediate shaft assembly, and the utility model discloses small, possess front and rear power output's function.

Description

Technical Field

[0001] This utility model relates to the field of forklift transmission technology, and in particular to off-road forklifts and their two-speed four-wheel drive transmissions. Background Technology

[0002] The main function of the gearbox is to adapt to various road conditions, including starting, accelerating, climbing hills, and high-speed driving on flat roads. The gearbox converts the engine's output torque and the vehicle speed to meet the driving requirements. Since the engine cannot reverse, the forklift's forward and reverse movements are also handled by the gearbox. Additionally, the gearbox can disconnect the engine from the drive system for extended periods. Patent CN212643474 U discloses a four-wheel drive off-road forklift gearbox with a two-speed forward and two-speed reverse configuration, which meets the needs of reverse power and improves the power required for reverse climbing and reverse driving. However, the gearbox is relatively large in size, and its power source is usually a traditional internal combustion engine, which will cause environmental pollution. Patent CN218935219U discloses a four-wheel drive two-speed gearbox with parallel arrangement of input shaft and intermediate shaft. The drive fork shaft drives the synchronizer to move along the axial movement of the input shaft to achieve high and low speed gear changes. Under the action of the differential, the power is transmitted to the wheels. By switching different gears, the electric vehicle can achieve a better maximum speed and maximum climbing gradient, while allowing the motor to work in the optimal efficiency range. However, this gearbox is still relatively large in size and does not have the function of front and rear power output. Utility Model Content

[0003] The purpose of this invention is to provide an off-road forklift and its two-speed four-wheel drive transmission to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A two-speed four-wheel drive transmission includes a transmission housing and an input shaft assembly, an intermediate shaft assembly, a rear output assembly, and a front output assembly disposed within the housing.

[0006] The input shaft assembly includes an input shaft, a first gear, and a first clutch. The first gear is loosely fitted at the front end of the input shaft and is connected to the input shaft via the first clutch.

[0007] The intermediate shaft assembly includes an intermediate shaft, a second gear, a third gear, a second clutch, and a fourth gear. The fourth gear and the second gear are respectively arranged at the front and rear ends of the intermediate shaft. The third gear is loosely fitted on the intermediate shaft and meshes with the external gear of the input shaft. The external gear of the intermediate shaft meshes with the first gear. The third gear is connected to the intermediate shaft for transmission through the second clutch.

[0008] The rear output assembly includes a rear output shaft, a fifth gear, and a third clutch. The fifth gear meshes with the second gear and is loosely fitted at the front end of the rear output shaft. The fifth gear is connected to the rear output shaft via the third clutch.

[0009] The front output assembly includes a sixth gear and a bevel gear. The sixth gear is fixed on the shaft of the bevel gear and meshes with the fourth gear.

[0010] Preferably, the external gear portion of the input shaft also serves as the housing of the first clutch. The first clutch is arranged inside the external gear portion of the input shaft. A first piston and a first return spring for resetting the first piston are provided on one side of the first clutch. The external friction plate of the first clutch is connected to the external gear portion of the input shaft, the internal friction plate of the first clutch is connected to the clutch seat of the first clutch, and the clutch seat of the first clutch is connected to the first gear.

[0011] Preferably, the external gear portion of the intermediate shaft also serves as the housing of the second clutch. The second clutch is arranged inside the external gear portion of the intermediate shaft. A second piston and a second return spring for resetting the second piston are provided on one side of the second clutch. The external friction plate of the second clutch is connected to the external gear portion of the intermediate shaft, the internal friction plate of the second clutch is connected to the clutch seat of the second clutch, and the clutch seat of the second clutch is connected to the third gear.

[0012] Preferably, the third clutch is a dog clutch, which is splined on the rear output shaft. A first elastic retaining ring is also fixed on the outer side wall of the rear output shaft. A third spring is provided between one end of the dog clutch and the first elastic retaining ring. The third spring is used to engage or disengage the other end of the dog clutch with the fifth gear.

[0013] Preferably, a third clutch cylinder is formed between the jaw clutch and the rear output shaft. The rear output shaft is provided with a first axial oil hole and a first radial oil hole near the third clutch cylinder. A fixed valve seat is provided inside the rear output shaft. Both ends of the fixed valve seat are connected to the first axial oil hole of the rear output shaft. A through hole connected to the first radial oil hole is provided on the side wall of the fixed valve seat. A valve core is provided inside the fixed valve seat. A fourth spring is provided between the valve core and the fixed valve seat. One end of the valve core is connected to the first axial oil hole of the rear output shaft, and the other end of the valve core is provided with a second radial oil hole.

[0014] Preferably, a second sealing ring and a third sealing ring are respectively fitted on both sides of the third clutch cylinder, a fourth sealing ring is provided between the fixed valve seat and the rear output shaft, and a second elastic retaining ring is provided at one end of the fixed valve seat.

[0015] Preferably, the gearbox housing includes a front housing and a rear housing, which are fixedly connected. The front and rear ends of the input shaft are supported on the front and rear housings by bearings, respectively. The front and rear ends of the intermediate shaft are supported on the front and rear housings by bearings, respectively. The front and rear ends of the rear output shaft are supported on the front and rear housings by bearings, respectively. The bevel gear is supported on the front housing by bearings. The input shaft is located above the intermediate shaft, and the rear output shaft and the bevel gear are located below the intermediate shaft.

[0016] Preferably, the system also includes a motor and a differential assembly. The motor is mounted on the rear housing and is connected to the input shaft via a drive connection. The differential assembly is mounted on the front housing and meshes with a bevel gear for drive. An output flange is provided on the rear output shaft via a spline.

[0017] Preferably, the front housing is also equipped with an oil pump, a filter and a solenoid directional valve; the bevel gear is an arc bevel pinion.

[0018] An off-road forklift, including a two-speed four-wheel drive gearbox as described above.

[0019] This utility model, by adopting the above technical solution, has the following beneficial effects:

[0020] 1. The gearbox of this utility model transmits power to the input shaft assembly via a motor, which then transmits the power to the intermediate shaft assembly. The fourth and second gears on the intermediate shaft assembly transmit the power to the fifth and sixth gears respectively. The sixth gear transmits the power to the differential assembly via a bevel gear, and the power is output from the differential assembly. The fifth gear transmits the power to the rear output shaft via a third clutch, and the power is output through the output flange mounted on it. Gear shifting is achieved through the first clutch on the input shaft assembly and the second clutch on the intermediate shaft assembly.

[0021] 2. In this utility model, the third clutch is a jaw clutch, which can easily cut off the power of the output shaft and make it more flexible to use;

[0022] 3. In this utility model, the power input is provided by an electric motor, which effectively reduces carbon dioxide emissions compared to traditional fuel engines and will not cause pollution to the environment. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0025] Figure 3 yes Figure 1 Enlarged view of point B in the middle;

[0026] Figure 4 This is one of the structural schematic diagrams of this utility model;

[0027] Figure 5 This is the second structural schematic diagram of this utility model.

[0028] Figure label:

[0029] 1. Motor; 101. Front housing; 102. Rear housing; 2. Input shaft assembly; 200. Input shaft; 201. First gear; 202. First clutch; 3. Intermediate shaft assembly; 300. Intermediate shaft; 301. Fourth gear; 302. Second gear; 303. Third gear; 304. Second clutch; 4. Rear output shaft assembly; 401. Rear output shaft; 4011. First axial oil hole; 4012. First radial oil hole; 402. Fifth gear; 403. Third clutch; 404. Output flange; 405. Fixed valve seat; 406. Valve core; 4061. Second radial oil hole; 407. Fourth spring; 408. First elastic retaining ring; 409. Third spring; 5. Sixth gear; 6. Bevel gear; 7. Differential assembly; 8. Filler vent plug; 9. First gear pressure oil port; 10. Second gear pressure oil port; 11. Rear output shaft pressure oil port; 12. Oil pump; 13. Filter; 14. Solenoid directional valve. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] like Figures 1 to 5 As shown, this utility model discloses a two-speed four-wheel drive gearbox, including a gearbox body and an input shaft assembly 2, an intermediate shaft assembly 3, a rear output assembly 4 and a front output assembly disposed in the gearbox body.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, the input shaft assembly 2 includes an input shaft 200, a first gear 201 and a first clutch 202. The first gear 201 is loosely fitted at the front end of the input shaft 200 and is connected to the input shaft 200 through the first clutch 202.

[0037] In this design, the external gear portion of the input shaft 200 also serves as the housing of the first clutch 202. The first clutch 202 is arranged inside the external gear portion of the input shaft 200. A first piston and a first return spring for resetting the first piston are provided on one side of the first clutch 202. The outer friction plate of the first clutch 202 is connected to the external gear portion of the input shaft 200, and the inner friction plate of the first clutch 202 is connected to the clutch seat of the first clutch 202. The clutch seat of the first clutch 202 is connected to the first gear 201.

[0038] The intermediate shaft assembly 3 includes an intermediate shaft 300, a second gear 302, a third gear 303, a second clutch 304, and a fourth gear 301. The fourth gear 301 and the second gear 302 are respectively arranged at the front and rear ends of the intermediate shaft 300. The third gear 303 is loosely fitted on the intermediate shaft 300 and meshes with the external gear of the input shaft 200. The external gear of the intermediate shaft 300 meshes with the first gear 201. The third gear 303 is connected to the intermediate shaft 300 through the second clutch 304.

[0039] In this design, the external gear portion of the intermediate shaft 300 also serves as the housing of the second clutch 304. The second clutch 304 is arranged inside the external gear portion of the intermediate shaft 300. A second piston and a second return spring for resetting the second piston are provided on one side of the second clutch 304. The outer friction plate of the second clutch 304 is connected to the external gear portion of the intermediate shaft 300, and the inner friction plate of the second clutch 304 is connected to the clutch seat of the second clutch 304. The clutch seat of the second clutch 304 is connected to the third gear 303.

[0040] like Figure 1 and Figure 3 As shown, the rear output assembly 4 includes a rear output shaft 401, a fifth gear 402 and a third clutch 403. The fifth gear 402 meshes with the second gear 302. The fifth gear 402 is loosely fitted at the front end of the rear output shaft 401. The fifth gear 402 is connected to the rear output shaft 401 through the third clutch 403.

[0041] In this utility model, the third clutch 403 is a dog clutch, which can easily cut off the power of the rear output shaft 401 and is more flexible in use. The dog clutch is set on the rear output shaft 401 by a spline. A first elastic retaining ring 408 is also fixed on the outer side wall of the rear output shaft 401. A third spring 409 is provided between one end of the dog clutch and the first elastic retaining ring 408. The third spring 409 is used to engage or disengage the other end of the dog clutch with the fifth gear 402.

[0042] A third clutch cylinder is formed between the jaw clutch and the rear output shaft 401. The rear output shaft 401 is provided with a first axial oil hole 4011 and a first radial oil hole 4012 near the third clutch cylinder. A fixed valve seat 405 is provided inside the rear output shaft 401. Both ends of the fixed valve seat 405 are connected to the first axial oil hole 4011 of the rear output shaft 401. A through hole connected to the first radial oil hole 4012 is provided on the side wall of the fixed valve seat 405. A valve core 406 is provided inside the fixed valve seat 405. A fourth spring 407 is provided between the valve core 406 and the fixed valve seat 405. One end of the valve core 406 is connected to the first axial oil hole 4011 of the rear output shaft 401, and the other end of the valve core 406 is provided with a second radial oil hole 4061. The fourth spring 407 causes the second radial oil hole 4061 to deviate from the first radial oil hole 4012.

[0043] When power needs to be output to the rear, the oil pump 12 delivers pressurized oil to the pressurized oil port 11 of the rear output shaft, and inputs it into the rear output shaft 401 through the first axial oil hole 4011 on the rear output shaft 401. The third clutch 403 engages, and the fifth gear 402 transmits the power to the rear output shaft 401 and outputs it through the output flange 404.

[0044] The second and third sealing rings are respectively fitted on both sides of the third clutch cylinder. A fourth sealing ring is provided between the fixed valve seat 405 and the rear output shaft 401. A second elastic retaining ring is provided at one end of the fixed valve seat 405.

[0045] The front output assembly includes a sixth gear 5 and a bevel gear 6. The sixth gear 5 is fixed on the shaft of the bevel gear 6 and meshes with the fourth gear 301. The bevel gear 6 is an arc bevel pinion.

[0046] The gearbox housing includes a front housing 101 and a rear housing 102, which are fixedly connected. The front and rear ends of the input shaft 200 are supported on the front and rear housings 101 and 102 respectively by bearings. The front and rear ends of the intermediate shaft 300 are also supported on the front and rear housings 101 and 102 respectively by bearings. The front and rear ends of the rear output shaft 401 are also supported on the front and rear housings 101 and 102 respectively by bearings. The bevel gear 6 is supported on the front housing 101 by bearings. The input shaft 200 is located above the intermediate shaft 300, and the rear output shaft 401 and the bevel gear 6 are located below the intermediate shaft 300. Figure 4 and Figure 5 As shown, the front housing 101 is also equipped with an oil pump 12, a filter 13 and a solenoid directional valve 14.

[0047] like Figures 1 to 5As shown, the gearbox also includes a motor 1 and a differential assembly 7. The motor 1 is mounted on the rear housing 102 and is connected to the input shaft 200 for transmission. The differential assembly 7 is mounted on the front housing 101 and is engaged with the bevel gear 6 for transmission. An output flange 404 is provided on the rear output shaft 401 via a spline.

[0048] The operating conditions for this transmission are as follows:

[0049] 1. When the forklift is in motion and the gearbox is in first gear, the oil pump 12 delivers transmission oil to the solenoid directional valve 14. The solenoid directional valve 14 delivers the transmission oil to the first gear pressure oil port 9, which then enters the input shaft assembly 2 through the oil hole on the input shaft 200. The first clutch 202 is engaged, and the motor 1 inputs power to the input shaft 200. The input shaft 200 transmits power to the first gear 201 through the first clutch 201. The first gear 201 transmits power to the intermediate shaft 300. The fourth gear 301 and the second gear 302 on the intermediate shaft 300 transmit power to the rear output shaft assembly 4 and the sixth gear 5, respectively. The rear output shaft assembly 4 outputs power through the output flange 404 on the rear output shaft 401. The sixth gear 5 transmits power to the differential assembly 7 through the bevel gear 6, and the power is output from the differential assembly 7.

[0050] 2. When the forklift is in motion and the gearbox is in second gear, the oil pump 12 delivers transmission oil to the solenoid directional valve 14. The solenoid directional valve 14 delivers the transmission oil to the second-gear pressure oil port 10, which then inputs the oil through the oil hole on the intermediate shaft 300 to the intermediate shaft assembly 3. The second clutch 304 is engaged, and the motor 1 inputs power to the input shaft 200. The input shaft 200 transmits power to the third gear 303, which transmits power to the intermediate shaft 300 through the second clutch 304. The fourth gear 301 and the second gear 302 on the intermediate shaft 300 transmit power to the rear output shaft assembly 4 and the sixth gear 5, respectively. The rear output shaft assembly 4 outputs power through the output flange 404 on the rear output shaft 401. The sixth gear 5 transmits power to the differential assembly 7 through the bevel gear 6, and the power is output from the differential assembly 7.

[0051] This utility model also discloses an off-road forklift, including the two-speed four-wheel drive gearbox as described above.

[0052] All features described in the specification, appended claims and drawings, whether individually or in any combination thereof, are essential features of this utility model.

[0053] In the description of this specification, the terms "one embodiment," "some embodiments," "one implementation," "specific implementation," "other implementation," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment, implementation, or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described above can also be combined in any suitable manner in one or more embodiments, implementations, or examples. The technical solutions described in this utility model also include technical solutions formed by any one or more specific features, structures, materials, or characteristics described above, either individually or in combination.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, alterations, deletions of some features, additions of features, or recombinations of features to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the innovative principles of the present invention shall still fall within the scope of the technical solutions of the present invention.

Claims

1. A two-speed four-wheel drive transmission, comprising a transmission body and an input shaft assembly (2), an intermediate shaft assembly (3), a rear output assembly (4), and a front output assembly disposed within the transmission body, characterized in that, The input shaft assembly (2) includes an input shaft (200), a first gear (201) and a first clutch (202). The first gear (201) is loosely fitted at the front end of the input shaft (200), and the first gear (201) is connected to the input shaft (200) through the first clutch (202). The intermediate shaft assembly (3) includes an intermediate shaft (300), a second gear (302), a third gear (303), a second clutch (304), and a fourth gear (301). The fourth gear (301) and the second gear (302) are respectively arranged at the front and rear ends of the intermediate shaft (300). The third gear (303) is loosely fitted on the intermediate shaft (300) and meshes with the external gear of the input shaft (200). The external gear of the intermediate shaft (300) meshes with the first gear (201). The third gear (303) is connected to the intermediate shaft (300) through the second clutch (304). The rear output assembly (4) includes a rear output shaft (401), a fifth gear (402) and a third clutch (403). The fifth gear (402) meshes with the second gear (302). The fifth gear (402) is loosely fitted at the front end of the rear output shaft (401). The fifth gear (402) is connected to the rear output shaft (401) through the third clutch (403). The front output assembly includes a sixth gear (5) and a bevel gear (6). The sixth gear (5) is fixed on the shaft of the bevel gear (6) and meshes with the fourth gear (301).

2. A two-speed four-wheel drive gearbox according to claim 1, characterised in that The external gear section of the input shaft (200) also serves as the housing of the first clutch (202). The first clutch (202) is arranged inside the external gear section of the input shaft (200). A first piston and a first return spring for resetting the first piston are provided on one side of the first clutch (202). The external friction plate of the first clutch (202) is connected to the external gear section of the input shaft (200). The internal friction plate of the first clutch (202) is connected to the clutch seat of the first clutch (202). The clutch seat of the first clutch (202) is connected to the first gear (201).

3. A two-speed four-wheel drive transfer case as in claim 1, wherein: The external gear section of the intermediate shaft (300) also serves as the housing of the second clutch (304). The second clutch (304) is arranged inside the external gear section of the intermediate shaft (300). A second piston and a second return spring for resetting the second piston are provided on one side of the second clutch (304). The outer friction plate of the second clutch (304) is connected to the external gear section of the intermediate shaft (300). The inner friction plate of the second clutch (304) is connected to the clutch seat of the second clutch (304). The clutch seat of the second clutch (304) is connected to the third gear (303).

4. A two-speed four-wheel drive transfer case as in claim 1, wherein: The third clutch (403) is a dog clutch. The dog clutch is set on the rear output shaft (401) by a spline. A first elastic retaining ring (408) is also fixed on the outer side wall of the rear output shaft (401). A third spring (409) is provided between one end of the dog clutch and the first elastic retaining ring (408). The third spring (409) is used to engage or disengage the other end of the dog clutch with the fifth gear (402).

5. A two-speed four-wheel drive gearbox according to claim 4, characterised in that, A third clutch cylinder is formed between the jaw clutch and the rear output shaft (401). The rear output shaft (401) is provided with a first axial oil hole (4011) and a first radial oil hole (4012) near the third clutch cylinder. The rear output shaft (401) is provided with a fixed valve seat (405). Both ends of the fixed valve seat (405) are connected to the first axial oil hole (4011) of the rear output shaft (401). The side wall of the fixed valve seat (405) is provided with a through hole connected to the first radial oil hole (4012). The fixed valve seat (405) is provided with a valve core (406). A fourth spring (407) is provided between the valve core (406) and the fixed valve seat (405). One end of the valve core (406) is connected to the first axial oil hole (4011) of the rear output shaft (401), and the other end of the valve core (406) is provided with a second radial oil hole (4061).

6. A two-speed four-wheel drive gearbox according to claim 5, characterised in that, The second and third sealing rings are respectively fitted on both sides of the third clutch cylinder, and a fourth sealing ring is provided between the fixed valve seat (405) and the rear output shaft (401). A second elastic retaining ring is provided at one end of the fixed valve seat (405).

7. A two-speed four-wheel drive transfer case as in claim 1, wherein: The gearbox housing includes a front housing (101) and a rear housing (102), which are fixedly connected. The front and rear ends of the input shaft (200) are supported on the front housing (101) and the rear housing (102) by bearings, respectively. The front and rear ends of the intermediate shaft (300) are supported on the front housing (101) and the rear housing (102) by bearings, respectively. The front and rear ends of the rear output shaft (401) are supported on the front housing (101) and the rear housing (102) by bearings, respectively. The bevel gear (6) is supported on the front housing (101) by bearings. The input shaft (200) is located above the intermediate shaft (300), and the rear output shaft (401) and the bevel gear (6) are located below the intermediate shaft (300).

8. A two-speed four-wheel drive gearbox according to claim 7, characterised in that, It also includes a motor (1) and a differential assembly (7). The motor (1) is mounted on the rear housing (102) and is connected to the input shaft (200) for transmission. The differential assembly (7) is mounted on the front housing (101) and is meshed with the bevel gear (6) for transmission. An output flange (404) is provided on the rear output shaft (401) via a spline.

9. A two-speed four-wheel drive transfer case as in claim 7, wherein, The front housing (101) is also equipped with an oil pump (12), a filter (13) and a solenoid reversing valve (14); the bevel gear (6) is an arc bevel pinion.

10. An off-road fork truck characterized by, Includes a two-speed four-wheel drive transmission as described in any one of claims 1-9.

Images