Transmission case for engineering vehicle

Abstract

The transmission case for the engineering vehicle comprises a transmission case body and a multifunctional brake device, the transmission case body comprises a machine shell, an input shaft and an output shaft, and the input shaft and the output shaft are in transmission connection through a gear transmission mechanism; the multifunctional brake device comprises a fixed sleeve, the inner end of the fixed sleeve is fixedly connected to the machine shell, and a limiting sleeve is movably installed on the outer side of the fixed sleeve; the hydraulic brake is fixedly connected to the mounting opening of the fixed sleeve; the spiral spring is fixedly arranged on the inner side of the limiting sleeve in a sleeving mode, the inner end of the spiral spring is fixedly connected to the limiting sleeve, and the rotating direction of the spiral spring is consistent with the transmission direction of the output shaft; and the driving mechanism is used for driving the hydraulic brake of the multifunctional brake device to act. According to the invention, the jitter of the output shaft of the transmission case for the engineering vehicle can be effectively and accurately detected, and the output shaft under the obvious jitter condition can be effectively and suddenly stopped according to the detection condition.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission boxes, and in particular to a transmission box for engineering vehicles. Background Art

[0002] Gearboxes are a common component in automobiles, significantly impacting the vehicle's overall transmission and engine efficiency, playing a crucial role in the vehicle's operation. However, the operating conditions of construction vehicles are relatively complex, and the loads they carry are generally heavy. Consequently, existing gearboxes used in construction vehicles experience a relatively high failure rate during use.

[0003] The output shaft of existing engineering vehicle transmissions often experiences significant vibration during use due to heavy loads. When the vibration amplitude of the output shaft exceeds the designed value, it is prone to damage, which in turn damages the transmission gear set. To address this issue, existing practices generally involve installing a vibration sensor on the housing of the engineering vehicle transmission. When the output shaft of the engineering vehicle transmission exhibits significant vibration under high load conditions, the corresponding transmission gear set also exhibits significant vibration. When the vibration level detected by the vibration sensor exceeds the set value, it is determined that the output shaft of the engineering vehicle transmission may be vibrating significantly, and the corresponding information is sent to the vehicle control system as an alarm for easy inspection and troubleshooting. In this way, although the operation of the output shaft of the transmission box for engineering vehicles can be effectively monitored to a certain extent, human assistance is still needed for troubleshooting; and when it is found that the output shaft of the transmission box for engineering vehicles may have obvious shaking, it is impossible to take corresponding remedial measures in time, and it can only be checked by stopping the machine. During the shutdown process, the transmission box for engineering vehicles in operation still has the probability of being damaged, which is very troublesome.

[0004] Therefore, the research purpose of this invention is to design a transmission box for engineering vehicles that can effectively and accurately detect the vibration of the output shaft of the transmission box for engineering vehicles, and effectively stop the output shaft under obvious shaking conditions according to the detection results, thereby effectively and significantly reducing the probability of damage to the equipment. Summary of the Invention

[0005] In view of the technical problems existing in the above-mentioned prior art, the present invention provides a transmission box for an engineering vehicle, which can effectively solve the technical problems existing in the above-mentioned prior art.

[0006] The technical solution of the present invention is: A transmission case for an engineering vehicle includes a transmission case body, the transmission case body including a housing, and an input shaft and an output shaft rotatably mounted on the housing, the input shaft and the output shaft being connected to each other via corresponding gear transmission mechanisms. The transmission case for an engineering vehicle also includes a multifunctional brake device, the multifunctional brake device including: A fixed sleeve is sleeved on the periphery of the output shaft, the inner end of the fixed sleeve is fixedly connected to the housing, and a corresponding mounting opening is provided on the inner side of the fixed sleeve. A corresponding limiting sleeve is movably mounted on the outer side of the fixed sleeve through a threaded connection; A hydraulic brake is fixedly connected to the mounting opening of the fixed sleeve, and a brake pad adapted for the hydraulic brake is fixedly connected to the output shaft; a coil spring fixedly sleeved on the inner side of the limiting sleeve, the inner end of the coil spring being fixedly connected to the limiting sleeve, and the rotation direction of the coil spring being consistent with the transmission direction of the output shaft, and the coil spring being sleeved on the outer side of the output shaft and being provided with a gap therebetween; The driving mechanism includes a hydraulic chamber arranged at the outer end of the fixed sleeve, the outer end of the hydraulic chamber is sealed and fixedly connected to a corresponding cover plate, the inner side of the cover plate is movably provided with a corresponding piston, and the outer side of the piston is fixedly connected outward to a plurality of piston shafts extending through the outer side of the cover plate; a three-way guide hole connected to the hydraulic chamber is provided on the inner side of the fixed sleeve, the oil inlet end of the hydraulic brake is connected to the bottom side of the three-way guide hole, and the top of the three-way guide hole is connected to an external hydraulic control system.

[0007] A corresponding stroke detection device is fixedly mounted on the fixed sleeve for detecting the stroke of the limiting sleeve. When the limiting sleeve moves inwardly to the position of the stroke detection device, the stroke detection device sends an alarm signal outward.

[0008] The stroke detection device includes a control module fixedly mounted on the fixed sleeve, and a signal transmitting module and a trigger switch connected to the control module. The trigger switch is facing the limit sleeve. When the limit sleeve moves inward and touches the trigger switch, the control module controls the signal transmitting module to send an alarm signal outward.

[0009] The signal transmitting module is a Bluetooth module.

[0010] The outer ends of the piston shafts are respectively rollingly mounted with corresponding abutment balls.

[0011] The inner side walls of the fixing sleeve and the limiting sleeve are respectively fixed with corresponding vibration-damping and noise-reducing material layers.

[0012] The housing includes an input shaft mounting portion and an output shaft mounting portion, and the input shaft and the output shaft are rotatably mounted on the input shaft mounting portion and the output shaft mounting portion respectively through corresponding mounting bearings. The input shaft mounting portion and the output shaft mounting portion are butt-jointed and mounted as a whole through a plurality of corresponding locking screws, and a gear mounting cavity is provided between the input shaft mounting portion and the output shaft mounting portion.

[0013] The inner end portion of the fixed sleeve is integrally formed and connected to the output shaft mounting portion. A plurality of corresponding connecting reinforcing ribs are evenly distributed on the input shaft mounting portion and the output shaft mounting portion.

[0014] The inner ends of the input shaft and the output shaft extend into the gear mounting cavity respectively. The gear transmission mechanism includes a main transmission gear mounted on the end of the input shaft. A corresponding transmission shaft is rotatably mounted in the gear mounting cavity. A first connecting gear meshing with the main transmission gear is mounted on the transmission shaft. A corresponding second connecting gear is fixedly mounted on the side of the transmission shaft where the first connecting gear is not mounted. A driven transmission gear meshing with the second connecting gear is fixedly mounted on the end of the output shaft.

[0015] A corresponding annular sealing gasket is fixedly installed at the connection between the input shaft mounting portion and the output shaft mounting portion.

[0016] Compared with the prior art, the advantages and positive effects of the present invention are: 1) The present invention adds a multifunctional brake device, which includes a fixed sleeve sleeved on the outer periphery of the output shaft, the inner end of the fixed sleeve is fixedly connected to the housing, and a mounting port is provided on the inner side thereof, and a limiting sleeve is movably installed on the outer side of the fixed sleeve by a threaded connection; then a hydraulic brake is fixedly installed at the mounting port of the fixed sleeve, and a brake pad is fixedly connected to the output shaft; then a coil spring is fixedly sleeved on the inner side of the limiting sleeve, wherein the inner end of the coil spring is fixedly connected to the limiting sleeve, and a gap is set between it and the outer side surface of the output shaft.

[0017] On this basis, the present invention is correspondingly provided with a driving mechanism for driving the multi-functional brake device, which includes a hydraulic chamber arranged at the outer end of the fixed sleeve, the outer end of the hydraulic chamber is sealed and fixedly connected with a corresponding cover plate, the inner side of the cover plate is movably provided with a corresponding piston, and the outer side of the piston is fixedly connected outward with several piston shafts extending through and to the outside of the cover plate; a three-way guide hole connected to the hydraulic chamber is provided on the inner side of the fixed sleeve, the oil inlet end of the hydraulic brake is connected to the bottom side of the three-way guide hole, and the top of the three-way guide hole is connected to the external hydraulic control system.

[0018] When the output shaft needs to brake and slow down during operation, the external hydraulic control system controls the hydraulic oil to enter the hydraulic brake through the three-way guide hole to brake and slow down the brake pads (output shaft). When the vibration amplitude of the output shaft exceeds the set value, its outer surface comes into contact with the coil spring. The high-speed output shaft and the coil spring form sufficient friction to drive the coil spring to coil around the output shaft, thereby tightening the coil spring on the output shaft to initially slow the output shaft. At the same time, the output shaft drives the coil spring to rotate, which in turn drives the limit sleeve to rotate around the fixed sleeve, pushing the piston shafts and pistons, thereby driving the hydraulic brake to brake and slow down the brake pads (output shaft). In this way, the vibration of the output shaft of the engineering vehicle transmission box can be effectively detected, and the output shaft under obvious vibration conditions can be effectively stopped according to the detection results, thereby significantly reducing the probability of equipment damage.

[0019] 2) The provision of the fixing and limiting sleeves of the present invention not only effectively assembles the multifunctional brake device and drive mechanism but also forms a corresponding vibration-damping area. During operation of the overall transmission assembly, the power output end, i.e., the output shaft, generates the greatest vibration. During the transmission of the output shaft's vibration to the housing, a significant portion of the vibration is transferred to the fixing and limiting sleeves, effectively reducing the amount of vibration transmitted to the housing and, therefore, minimizing mechanical damage to the engineering vehicle transmission case caused by the output shaft's vibration.

[0020] 3) The fixed sleeve of the present invention is fixedly mounted with a corresponding stroke detection device, which detects the stroke of the limit sleeve. When the limit sleeve moves inward to the position of the stroke detection device, the stroke detection device sends an alarm signal. This effectively sends an alarm signal while completing the output shaft emergency stop, thereby further effectively and accurately detecting the vibration of the output shaft of the engineering vehicle transmission box.

[0021] 4) The outer ends of the piston shafts of the present invention are respectively rollingly mounted with corresponding abutment balls to ensure rolling contact between the limiting sleeve and the piston shaft during rotation, thereby reducing the negative effects caused by friction and ensuring smooth emergency stop operation of the output shaft.

[0022] 5) The inner side walls of the fixing sleeve and the limiting sleeve of the present invention are respectively fixed with corresponding vibration-damping and noise-reducing material layers to quickly reduce the vibration amount transmitted to the fixing sleeve and the limiting sleeve, thereby further effectively reducing the vibration amount transmitted to the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2It is a top view of the present invention.

[0025] Figure 3 It is a cross-sectional view of the present invention.

[0026] Figure 4 For the present invention Figure 3 A partial enlarged view of part A in .

[0027] Figure 5 It is a schematic diagram of the assembly of the driving mechanism of the present invention.

[0028] Figure 6 It is a structural schematic diagram of the stroke detection device of the present invention.

[0029] In the accompanying drawings: transmission box body 1, casing 101, input shaft mounting part 1011, output shaft mounting part 1012, input shaft 102, output shaft 103, gear transmission mechanism 2, main transmission gear 201, transmission shaft 202, first connecting gear 203, second connecting gear 204, driven transmission gear 205, multi-functional brake device 3, fixing sleeve 301, limiting sleeve 302, hydraulic brake 303, brake pad 304, coil spring 305, driving mechanism 306, hydraulic chamber 3061, cover plate 3062, piston 3063, piston shaft 3064, three-way guide hole 3065, mounting port 4, stroke detection device 5, control module 501, signal transmitting module 502, trigger switch 503, abutting ball 6, vibration reduction and noise reduction material layer 7, locking bolt 8, gear mounting cavity 9, connecting reinforcing rib plate 10, annular sealing gasket 11. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] refer to Figure 1-6 A transmission case for an engineering vehicle includes a transmission case body 1, the transmission case body 1 including a housing 101, and an input shaft 102 and an output shaft 103 rotatably mounted on the housing 101, the input shaft 102 and the output shaft 103 being connected to each other via corresponding gear transmission mechanisms 2. The transmission case for an engineering vehicle also includes a multifunctional brake device 3, which includes: A fixed sleeve 301 is sleeved around the outer periphery of the output shaft 103. The inner end of the fixed sleeve 301 is fixedly connected to the housing 101, and a corresponding mounting opening 4 is provided on the inner side of the fixed sleeve 301. A corresponding limiting sleeve 302 is movably mounted on the outer side of the fixed sleeve 301 via a threaded connection. The hydraulic brake 303 is fixed to the mounting opening 4 of the fixed sleeve 301 , and a brake pad 304 adapted to the hydraulic brake 303 is fixed to the output shaft 103 ; A coil spring 305 is fixedly mounted on the inner side of the limiting sleeve 302. The inner end of the coil spring 305 is fixedly connected to the limiting sleeve 302, and the rotation direction of the coil spring 305 is consistent with the transmission direction of the output shaft 103. The coil spring 305 is mounted on the outer side of the output shaft 103 and is provided with a gap therebetween. The driving mechanism 306 includes a hydraulic chamber 3061 arranged at the outer end of the fixed sleeve 301, and the outer end of the hydraulic chamber 3061 is sealed and fixedly connected to a corresponding cover plate 3062, and a corresponding piston 3063 is movably provided on the inner side of the cover plate 3062, and the outer side of the piston 3063 is fixedly connected outwardly to a plurality of piston shafts 3064 extending through the outer side of the cover plate 3062; a three-way guide hole 3065 connected to the hydraulic chamber 3061 is provided on the inner side of the fixed sleeve 301, and the oil inlet end of the hydraulic brake 303 is connected to the bottom side of the three-way guide hole 3065, and the top of the three-way guide hole 3065 is connected to the external hydraulic control system.

[0032] The present invention is additionally provided with a multifunctional brake device 3, which includes a fixed sleeve 301 sleeved on the outer periphery of the output shaft 103, the inner end portion of the fixed sleeve 301 is fixedly connected to the housing 101, and a mounting port 4 is provided on the inner side thereof, and a limiting sleeve 302 is movably installed on the outer side of the fixed sleeve 301 through a threaded connection; then a hydraulic brake 303 is fixedly installed at the mounting port 4 of the fixed sleeve 301, and a brake pad 304 is fixedly connected to the output shaft 103; then a coil spring 305 is fixedly sleeved on the inner side of the limiting sleeve 302, wherein the inner end portion of the coil spring 305 is fixedly connected to the limiting sleeve 302, and a gap is set between it and the outer side surface of the output shaft 103.

[0033] On this basis, the present invention is correspondingly provided with a driving mechanism 306 for driving the multi-functional brake device 3, which includes a hydraulic chamber 3061 arranged at the outer end of the fixed sleeve 301, and the outer end of the hydraulic chamber 3061 is sealed and fixedly connected with a corresponding cover plate 3062, and a corresponding piston 3063 is movably provided on the inner side of the cover plate 3062, and the outer side of the piston 3063 is fixedly connected outward with a plurality of piston shafts 3064 extending through and to the outside of the cover plate 3062; a three-way guide hole 3065 connected to the hydraulic chamber 3061 is provided on the inner side of the fixed sleeve 301, and the oil inlet end of the hydraulic brake 303 is connected to the bottom side of the three-way guide hole 3065, and the top of the three-way guide hole 3065 is connected to the external hydraulic control system.

[0034] When the output shaft 103 needs to brake and decelerate during operation, the external hydraulic control system controls hydraulic oil to enter the hydraulic brake 303 through the three-way guide hole 3065, thereby braking and decelerating the brake pad 304 (output shaft). When the vibration amplitude of the output shaft 103 exceeds the set value, its outer surface comes into contact with the coil spring 305. The high-speed output shaft 103 and the coil spring 305 generate sufficient friction to drive the coil spring 305 to coil around the output shaft 103, thereby tightening the coil spring 305 on the output shaft 103 and initially decelerating the output shaft 103. At the same time, the output shaft 103 drives the coil spring 305 to rotate with it, thereby driving the limiting sleeve 302 to rotate around the fixed sleeve 301, thereby pushing the multiple piston shafts 3064 and pistons 3063, thereby driving the hydraulic brake 303 to brake and decelerate the brake pad 304 (output shaft). In this way, the vibration of the output shaft 103 of the transmission box for engineering vehicles can be effectively and accurately detected, and the output shaft 103 in obvious vibration conditions can be effectively stopped according to the detection results, thereby effectively and significantly reducing the probability of equipment damage.

[0035] The arrangement of the fixing sleeve 301 and the limiting sleeve 302 of the present invention not only effectively assembles the multifunctional brake device 3 and the drive mechanism 306, but also forms a corresponding vibration-reducing area. During operation of the entire transmission assembly, the power output end, i.e., the output shaft 103, generates the greatest vibration. During the transmission of the vibration generated by the output shaft 103 to the housing 101, a significant portion of the vibration is transferred to the fixing sleeve 301 and the limiting sleeve 302, thereby effectively reducing the amount of vibration transmitted to the housing 101 and thereby minimizing mechanical damage to the engineering vehicle transmission case caused by the vibration generated by the output shaft 103.

[0036] A corresponding stroke detection device 5 is fixedly mounted on the fixed sleeve 301 for detecting the stroke of the limiting sleeve 302. When the limiting sleeve 302 moves inward to the position of the stroke detection device 5, the stroke detection device 5 sends an alarm signal outward.

[0037] The travel detection device 5 includes a control module 501 fixedly mounted on the fixed sleeve 301, a signal transmission module 502 connected to the control module 501, and a trigger switch 503. The trigger switch 503 faces the limit sleeve 302. When the limit sleeve 302 moves inward and touches the trigger switch 503, the control module 501 controls the signal transmission module 502 to send an alarm signal. The signal transmission module 502 is a Bluetooth module.

[0038] A corresponding stroke detection device 5 is fixedly installed on the fixed sleeve 301 of the present invention, through which the stroke of the limit sleeve 302 is detected. When the limit sleeve 302 moves inward to the position of the stroke detection device 5, the stroke detection device 5 sends an alarm signal outward, so as to effectively send out an alarm signal while completing the emergency stop of the output shaft 103, thereby effectively further accurately detecting the vibration of the output shaft 103 of the transmission box for engineering vehicles.

[0039] The outer ends of the piston shaft 3064 are respectively rollingly mounted with corresponding abutment balls 6 to ensure rolling contact between the limiting sleeve 302 and the piston shaft 3064 during the rotation process, thereby reducing the negative impact caused by friction and ensuring the smooth emergency stop operation of the output shaft 103.

[0040] The inner side walls of the fixing sleeve 301 and the limiting sleeve 302 are respectively fixed with corresponding vibration-damping and noise-reducing material layers 7 to quickly reduce the vibration amount transmitted to the fixing sleeve 301 and the limiting sleeve 302, thereby further effectively reducing the vibration amount transmitted to the housing 101.

[0041] The housing 101 includes an input shaft mounting portion 1011 and an output shaft mounting portion 1012. The input shaft 102 and the output shaft 103 are rotatably mounted on the input shaft mounting portion 1011 and the output shaft mounting portion 1012 respectively through corresponding mounting bearings. The input shaft mounting portion 1011 and the output shaft mounting portion 1012 are docked and mounted as a whole through a plurality of corresponding locking bolts 8, and a gear mounting cavity 9 is provided between the input shaft mounting portion 1011 and the output shaft mounting portion 1012.

[0042] The inner end portion of the fixed sleeve 301 is integrally connected to the output shaft mounting portion 1012 . A plurality of corresponding connecting reinforcing ribs 10 are evenly distributed on the input shaft mounting portion 1011 and the output shaft mounting portion 1012 .

[0043] The inner ends of the input shaft 102 and the output shaft 103 extend into the gear mounting cavity 9 respectively. The gear transmission mechanism 2 includes a main transmission gear 201 mounted on the end of the input shaft 102. A corresponding transmission shaft 202 is rotatably mounted in the gear mounting cavity 9. A first connecting gear 203 meshing with the main transmission gear 201 is mounted on the transmission shaft 202. A corresponding second connecting gear 204 is fixedly mounted on the side of the transmission shaft 202 where the first connecting gear 203 is not mounted. A driven transmission gear 205 meshingly connected to the second connecting gear 204 is fixedly mounted on the end of the output shaft 103.

[0044] A corresponding annular sealing gasket 11 is fixedly installed at the connection between the input shaft mounting portion 1011 and the output shaft mounting portion 1012 .

[0045] The above are merely preferred embodiments of the present invention and do not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A transmission case for an engineering vehicle, comprising a transmission case body (1), wherein the transmission case body (1) comprises a housing (101), and an input shaft (102) and an output shaft (103) rotatably mounted on the housing (101), wherein the input shaft (102) and the output shaft (103) are connected in transmission via corresponding gear transmission mechanisms (2), and wherein: The transmission case for the engineering vehicle further comprises a multifunctional brake device (3), wherein the multifunctional brake device (3) comprises: A fixed sleeve (301) is sleeved on the periphery of the output shaft (103), the inner end of the fixed sleeve (301) is fixedly connected to the housing (101), and a corresponding mounting opening (4) is provided on the inner side of the fixed sleeve (301), and a corresponding limiting sleeve (302) is movably mounted on the outer side of the fixed sleeve (301) through a threaded connection; A hydraulic brake (303) is fixedly connected to the mounting opening (4) of the fixed sleeve (301), and a brake pad (304) adapted to the hydraulic brake (303) is fixedly connected to the output shaft (103); a coil spring (305) fixedly sleeved on the inner side of the limiting sleeve (302), the inner end of the coil spring (305) being fixedly connected to the limiting sleeve (302), and the rotation direction of the coil spring (305) being consistent with the transmission direction of the output shaft (103), and the coil spring (305) being sleeved on the outer side of the output shaft (103) and being provided with a gap between the coil spring (305) and the outer side surface of the output shaft (103); The driving mechanism (306) comprises a hydraulic chamber (3061) arranged at the outer end of the fixed sleeve (301), the outer end of the hydraulic chamber (3061) is sealed and fixedly connected to a corresponding cover plate (3062), the inner side of the cover plate (3062) is movably provided with a corresponding piston (3063), and the outer side of the piston (3063) is fixedly connected outwardly to a plurality of piston shafts (3064) extending through and extending to the outer side of the cover plate (3062); a three-way guide hole (3065) connected to the hydraulic chamber (3061) is provided on the inner side of the fixed sleeve (301), the oil inlet end of the hydraulic brake (303) is connected to the bottom side of the three-way guide hole (3065), and the top of the three-way guide hole (3065) is connected to an external hydraulic control system.

2. The transmission case for an engineering vehicle according to claim 1, characterized in that: A corresponding stroke detection device (5) is fixedly mounted on the fixed sleeve (301) for detecting the stroke of the limiting sleeve (302). When the limiting sleeve (302) moves inward to the position of the stroke detection device (5), the stroke detection device (5) sends an alarm signal outward.

3. The transmission case for an engineering vehicle according to claim 2, characterized in that: The stroke detection device (5) comprises a control module (501) fixedly mounted on the fixed sleeve (301), and a signal transmitting module (502) and a trigger switch (503) connected to the control module (501), wherein the trigger switch (503) faces the limit sleeve (302). When the limit sleeve (302) moves inwardly and touches the trigger switch (503), the control module (501) controls the signal transmitting module (502) to send an alarm signal outward.

4. A transmission case for an engineering vehicle according to claim 3, characterized in that: The signal transmission module (502) is a Bluetooth module.

5. The transmission case for an engineering vehicle according to claim 1, characterized in that: The outer ends of the piston shafts (3064) are respectively rollingly mounted with corresponding abutment balls (6).

6. The transmission case for an engineering vehicle according to claim 1, characterized in that: The inner side walls of the fixing sleeve (301) and the limiting sleeve (302) are respectively fixed with corresponding vibration-damping and noise-reducing material layers (7).

7. The transmission case for an engineering vehicle according to claim 1, characterized in that: The housing (101) comprises an input shaft mounting portion (1011) and an output shaft mounting portion (1012); the input shaft (102) and the output shaft (103) are rotatably mounted on the input shaft mounting portion (1011) and the output shaft mounting portion (1012) respectively via corresponding mounting bearings; the input shaft mounting portion (1011) and the output shaft mounting portion (1012) are butt-jointed and mounted as a whole via a plurality of corresponding locking bolts (8); and a gear mounting cavity (9) is provided between the input shaft mounting portion (1011) and the output shaft mounting portion (1012).

8. The transmission case for an engineering vehicle according to claim 7, characterized in that: The inner end portion of the fixed sleeve (301) is integrally formed and connected to the output shaft mounting portion (1012), and a plurality of corresponding connecting reinforcing ribs (10) are evenly distributed on the input shaft mounting portion (1011) and the output shaft mounting portion (1012).

9. The transmission case for an engineering vehicle according to claim 7, characterized in that: The inner ends of the input shaft (102) and the output shaft (103) extend into the gear mounting cavity (9) respectively. The gear transmission mechanism (2) comprises a main transmission gear (201) mounted on the end of the input shaft (102). A corresponding transmission shaft (202) is rotatably mounted in the gear mounting cavity (9). A first connecting gear (203) meshing with the main transmission gear (201) is mounted on the transmission shaft (202). A corresponding second connecting gear (204) is fixedly mounted on a side of the transmission shaft (202) where the first connecting gear (203) is not mounted. A driven transmission gear (205) meshingly connected to the second connecting gear (204) is fixedly mounted on the end of the output shaft (103).

10. The transmission case for an engineering vehicle according to claim 7, characterized in that: A corresponding annular sealing gasket (11) is fixedly installed at the connection between the input shaft mounting portion (1011) and the output shaft mounting portion (1012).

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