The front crawler belt of an all-wheel drive traction chassis

Abstract

The present invention provides a liftable front-drive crawler of an all-wheel drive traction chassis, wherein the chassis is provided with relatively independently rotating running wheels on both sides, and the liftable front-drive crawler comprises a crawler, a crawler driving mechanism and a lifting mechanism; the crawler driving mechanism is provided with a differential, and the differential is provided with two rotating shafts, and the two rotating shafts are transmission-connected with the running wheels on both sides; the lifting mechanism comprises an electric push rod, a shock absorber, a connecting frame, a lifting arm and a swing arm. The liftable front-drive crawler provided by the present invention is provided with a differential, and in conjunction with the two independently rotating running wheels at the rear side, the traction chassis can realize on-the-spot steering, and has stronger maneuverability in a narrow space; in addition, the crawler is also provided with a lifting mechanism, which can drive the front end of the crawler to be lifted and lowered, so that the all-wheel drive traction chassis has flexible follow-up and active ground profiling capabilities and intelligent posture control capabilities, ensuring full ground contact and exerting the best traction capability while improving passability; improving the ability to cross obstacles and gullies.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and particularly to a front-drive crawler of a full-drive traction chassis. Background Art

[0002] Traction chassis are currently mainly divided into wheeled chassis or crawler chassis. The greatest advantage of wheeled chassis is low fuel consumption and easy mobility. The characteristics of crawler running devices are large driving force, thus good cross-country performance and stability, large climbing ability and small turning radius, and good flexibility. However, the manufacturing cost of crawler running devices is high, the running speed is low, the power consumption is large during running and turning, and the parts wear quickly. Compared with crawler running devices, the advantages of tire-type running devices are fast running speed and good mobility. The tires do not damage the road surface during running, so they are very popular in urban construction. The disadvantages are large ground contact pressure and small climbing ability.

[0003] We hope to provide a liftable front-drive crawler for a full-drive traction chassis. This crawler cooperates with the independently rotatable road wheels on both sides at the rear end of the full-drive traction chassis, making the full-drive traction chassis more maneuverable and obstacle-crossing capable, and it can also have a in-situ steering function that other crawler chassis do not have, with the expectation of playing an active role in fields such as agriculture, emergency rescue, and fire patrol. Summary of the Invention

[0004] The present invention provides a liftable front-drive crawler for a full-drive traction chassis. The full-drive traction chassis is provided with relatively independently rotatable road wheels on both sides. The liftable front-drive crawler includes a crawler, a crawler drive mechanism, and a lifting mechanism;

[0005] The crawler drive mechanism includes a crawler drive wheel and a driven wheel. The crawler drive wheel and the driven wheel are connected by a crawler. The driven wheel is installed on a crawler wheel support frame. A differential is fixedly installed at the rotating shaft of the crawler drive wheel. The differential has two rotating shafts, and the two rotating shafts are in transmission connection with the road wheels on both sides;

[0006] The lifting mechanism includes an electric push rod, a shock absorber, a connecting frame, a lifting arm, and a swing arm. The two ends of the electric push rod are respectively rotatably connected to the full-drive traction chassis and the connecting frame. The shock absorber is fixed on the connecting frame. The connecting frame is connected to the full-drive traction chassis through a connecting rod and is rotatably connected to the lifting arm at the other end. The lifting arm is fixedly connected to the swing arm and the crawler wheel support frame, and the rear end of the swing arm is rotatably installed on a rotating shaft.

[0007] Further, the differential includes a differential housing fixedly connected coaxially with the crawler drive wheel. Inside the differential housing, there are a first bevel gear, a second bevel gear, and a planetary gear shaft in the middle. There are two opposing card slots on the inner ring of the differential housing. The planetary gear shaft is installed between the two card slots. The first bevel gear and the second bevel gear are respectively fixed at the opposite ends of the two rotating shafts. Third bevel gears that are simultaneously meshed with the first bevel gear and the second bevel gear are fixed at both ends of the planetary gear shaft.

[0008] Further, the connecting frame is U-shaped, the electric push rod is located inside the U-shaped connecting frame, and a shock absorber is fixedly installed on each of the outer sides of the U-shaped connecting frame.

[0009] Further, a mounting substrate is fixedly installed on the all-wheel drive traction chassis, and the electric push rod and the connecting rod are both rotatably connected to the mounting substrate.

[0010] Further, the lifting arm is a "door"-shaped frame, and a swing arm is installed on each of the two sides at the bottom of the lifting arm.

[0011] Further, a plurality of tension wheels are installed on the crawler wheel support frame.

[0012] The liftable front-wheel drive crawler of the all-wheel drive traction chassis provided by the present invention, in cooperation with the two independently operating rear wheels, enables the traction chassis to achieve in-situ steering and has stronger maneuverability in narrow spaces; in addition, the crawler is also equipped with a lifting mechanism for lifting or lowering the front end of the traction crawler, improving the ability to cross obstacles and gullies. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0014] Figure 1 Schematic diagram of the all-wheel drive traction chassis equipped with the liftable front-wheel drive crawler of the present invention;

[0015] Figure 2 Stereo structure diagram of the liftable front-wheel drive crawler;

[0016] Figure 3 Top view structure diagram of the liftable front-wheel drive crawler;

[0017] Figure 4 Side view structure diagram of the liftable front-wheel drive crawler;

[0018] Figure 5 Schematic diagram of swing arms installed on both rotating shafts of the crawler;

[0019] Figure 6 Schematic diagram of the connection between the two rotating shafts through a reduction gearbox;

[0020] Figure 7 Schematic diagram of the crawler drive wheel and the internal differential structure;

[0021] Figure 8is a schematic diagram of the connection of the gears of the differential between the two shafts;

[0022] Figure 9 This is a schematic diagram of the first on-site steering method of the present invention;

[0023] Figure 10 It is the principle diagram of the second on-site steering method of the present invention. DETAILED DESCRIPTION

[0024] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0025] In order to fully understand the present invention, detailed steps and detailed structures will be proposed in the following description to illustrate the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0026] The present invention provides a liftable front-drive crawler of an all-wheel drive traction chassis. The all-wheel drive traction chassis is provided with relatively independently rotating running wheels 201 on both sides of a vehicle body 100. The liftable front-drive crawler comprises a crawler 301, a crawler driving mechanism 310 and a lifting mechanism 320.

[0027] Track drive mechanism 310

[0028] The crawler drive mechanism 310 includes a crawler drive wheel 313 and a driven wheel 314. The crawler drive wheel 313 and the driven wheel 314 are connected to each other through the crawler 301. Figure 4 The driven wheel 314 is mounted on the track wheel support frame 315. Figure 4 shown.

[0029] like Figure 5 As shown, a differential 312 is fixedly installed at the rotating shaft of the crawler driving wheel 313. The differential 312 is provided with two rotating shafts 311. The two rotating shafts 311 are respectively connected to the walking wheels 201 on both sides. The medium of the transmission connection can be a chain / belt / universal joint, etc.

[0030] Further references Figure 7 and Figure 8, the differential 312 includes a differential housing 312-4 fixedly connected coaxially with the crawler drive wheel 313. Inside the differential housing 312-4, there are a first bevel gear 312-1, a second bevel gear 312-2, and a middle planetary gear shaft 312-3. Opposite two card slots 312-4a are provided on the inner ring of the differential housing 312-4. The planetary gear shaft 312-3 is installed between the two card slots 312-4a. The first bevel gear 312-1 and the second bevel gear 312-2 are respectively fixed at the opposite ends of two rotating shafts 311. Third bevel gears 312-3a that are simultaneously meshed with the first bevel gear 312-1 and the second bevel gear 312-2 are fixed at both ends of the planetary gear shaft 312-3. When the differential housing 312-4 rotates, it drives the crawler 301 to rotate. On the contrary, when the differential housing 312-4 is braked, the crawler 301 is also braked.

[0031] The liftable front crawler of the present invention is configured with a differential 312. By matching with the traveling wheels 201 that rotate relatively independently on both sides at the rear of the vehicle body, it has two ways of in-situ steering:

[0032] Taking Figure 9 as an example, the way of in-situ steering one is described as follows:

[0033] 1) Through the transmission clutch braking mechanism, the left traveling wheel 201 (i.e., Figure 9 the lower wheel) is in a free state of following.

[0034] 2) The differential housing 312-4 of the differential 312 is fixedly connected to the crawler driving wheel rotating shaft. In this state, the differential housing needs to be braked, that is, the crawler drive wheel 313 is in a braked state.

[0035] 3) Under the above two conditions as Figure 9 shown, when the machine is moving forward, the right traveling wheel 201 rotates to drive the right half shaft of the differential 312 to rotate. At this time, since the differential housing 312-4 is fixed, the left half shaft of the differential 312 will rotate in the reverse direction, thereby driving the left sprocket / pulley backward and driving the left traveling wheel 201 to rotate in the reverse direction, as Figure 9 the arrow directions of the two traveling wheels. The forward directions of the two wheels of the whole machine are as Figure 9 shown. The front crawler is braked. The final result is that the whole machine will take the contact point A between the crawler and the ground as the origin and make an in-situ steering movement.

[0036] Taking Figure 10 as an example, the way of in-situ steering two is described as follows:

[0037] 1) Different from the steering method one, at this time, the left traveling wheel 201 is in a braked state through the transmission.

[0038] 2) In this state, the crawler driving wheel 313 is in a non-braking state (free state).

[0039] 3) Under the above two conditions, Figure 10 As shown, when the machine is moving forward, the right half shaft rotates to drive the travel wheel forward, thereby driving the right sprocket / belt forward, and the right half shaft of the differential rotates. At this time, the differential case 312-4 is not braked, so the left travel wheel 201 is in a braking state, and the left half shaft of the differential is stationary. According to the differential principle, the differential case 312-4 runs at a speed twice that of the right half shaft of the differential, thereby driving the crawler to run at a speed twice that of the right half shaft of the differential.

[0040] The final result is that the entire machine will make an in-situ turning motion with the contact point B between the stationary left wheel and the ground as the origin.

[0041] It should be noted that the structure of the all-wheel drive traction chassis for realizing relatively independent rotation of the running wheels 201 on both sides is recorded in another patent application filed by the applicant on the same filing date as the present case. The inventive point of the present invention is not the structure of independent rotation of the running wheels 201, so its structural features will not be described in detail here.

[0042] Lifting mechanism 320

[0043] like Figures 1-6 As shown, the lifting mechanism 320 includes an electric push rod 321, a shock absorber 322, a connecting frame 323, a lifting arm 324 and a swing arm 325.

[0044] A mounting base plate 327 is fixedly mounted on the all-wheel drive traction chassis, and the two ends of the electric push rod 321 are rotatably connected to the mounting base plate 327 and the connecting frame 323. The connecting frame 323 is U-shaped, and the electric push rod 321 is located on the inner side of the U-shaped connecting frame 323. A shock absorber 322 is fixedly mounted on both sides of the outer side of the U-shaped connecting frame. The front end of the shock absorber 322 is rotatably connected to the "door"-shaped lifting arm 324, and the rear end is rotatably connected to the mounting base plate 327 through a connecting rod 326. The lifting arm 324 is fixedly connected to the swing arm 325 and the track wheel support frame 315, and the rear end of the swing arm 325 is rotatably mounted on the rotating shaft 311.

[0045] In order to ensure the stability of the crawler track rotation, a plurality of tensioning wheels 316 are installed on the crawler wheel support frame 315. Figure 4 .

[0046] The principle of the lifting mechanism 320 driving the front end of the crawler to lift is briefly described as follows: The retraction of the push rod at the front end of the electric push rod 321 drives the movement of the connecting frame 323. Since the front end of the connecting frame 323 is rotatably connected to the push rod and the rear end is rotatably connected to the mounting substrate 327 through the connecting rod 326, finally the front end of the connecting frame 323 is lifted. The connecting frame 323 drives the lifting arm 32 to lift. The lifting arm 324 drives the front end of the swing arm 325 to rotate around the rotating shaft 311 and lift upward, thereby finally driving the front end of the entire crawler to lift, while the rear end still contacts the ground, enabling the crawler to cross obstacles of a certain height. When the electric push rod 321 advances forward, the front end of the crawler can be lowered, and the process is opposite to the above process and will not be elaborated here.

[0047] The advantages of the present invention are as follows:

[0048] 1) The articulated crawler with an ankle-like function and the two rear side-by-side walking wheels form a wheel-track compound walking mechanism with an equilateral triangle distribution, having flexible follow-up and active ground profiling capabilities and attitude intelligent regulation capabilities. While ensuring sufficient ground contact and exerting the best traction capacity, the passability is improved;

[0049] 2) The front end of the traction chassis is equipped with a unique ground-hugging walking track, which greatly reduces the center of gravity height and overall height of the machine body, improves the operation anti-tipping ability and the stability of the whole machine, and is convenient for passing through greenhouses, orchards, etc. in limited and narrow spaces or livestock pens and poultry houses to engage in planting and breeding operations;

[0050] 3) The liftable front crawler cooperates with the two independently rotating rear walking wheels, and the traction chassis can achieve in-situ steering, with stronger mobility in narrow spaces;

[0051] 4) The crawler is configured with a lifting mechanism to lift or lower the front end of the traction crawler, improving the ability to cross obstacles and gullies;

[0052] 5) The lifting mechanism is installed above the rear side of the crawler, without occupying the lateral space, avoiding the collision of obstacles on both sides of the crawler during the traveling process with the lifting mechanism, and playing a role in protecting the lifting mechanism;

[0053] 5) Swing arms are provided on both sides of the crawler, and both swing arms are fixedly connected to the gantry lifting arm, and the force is more evenly distributed during the lifting process.

[0054] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail therein should be understood to be implemented in a common manner in the art; any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above, or modify it into equivalent embodiments with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A front crawler belt of a full-drive traction chassis. The full-drive traction chassis is provided with relatively independently rotatable traveling wheels (201) on both sides, characterized in that, The front-drive crawler comprises a crawler (301), a crawler drive mechanism (310) and a lifting mechanism (320); The crawler drive mechanism (310) comprises a crawler drive wheel (313) and a driven wheel (314); the crawler drive wheel (313) and the driven wheel (314) are connected in driving connection via a crawler (301); the driven wheel (314) is mounted on a crawler wheel support frame (315); a differential (312) is fixedly mounted on the rotating shaft of the crawler drive wheel (313); the differential (312) is provided with two rotating shafts (311); the two rotating shafts (311) are respectively connected in driving connection with the travel wheels (201) on both sides; The lifting mechanism (320) comprises an electric push rod (321), a shock absorber (322), a connecting frame (323), a lifting arm (324) and a swing arm (325); two ends of the electric push rod (321) are rotatably connected to the all-wheel drive traction chassis and the connecting frame (323), respectively; the shock absorber (322) is fixed to the connecting frame (323); one end of the connecting frame (323) is connected to the all-wheel drive traction chassis via a connecting rod (326), and the other end is rotatably connected to the lifting arm (324); the lifting arm (324) is fixedly connected to the swing arm (325) and the track wheel support frame (315), and the rear end of the swing arm (325) is rotatably mounted on the rotating shaft (311); The differential (312) comprises a differential housing (312-4) coaxially fixedly connected to a crawler drive wheel (313); a first bevel gear (312-1), a second bevel gear (312-2) and a planetary gear shaft (312-3) are arranged in the differential housing (312-4); two opposite slots (312-4a) are arranged on the inner ring of the differential housing (312-4); the planetary gear shaft (312-3) is installed between the two slots (312-4a); the first bevel gear (312-1) and the second bevel gear (312-2) are respectively fixed to opposite ends of two rotating shafts (311); and third bevel gears (312-3a) meshing with the first bevel gear (312-1) and the second bevel gear (312-2) are fixed at both ends of the planetary gear shaft (312-3); The connecting frame (323) is U-shaped, the electric push rod (321) is located inside the U-shaped connecting frame (323), and a shock absorber (322) is fixedly installed on both sides of the outside of the U-shaped connecting frame.

2. The front crawler belt of the all-wheel drive traction chassis according to claim 1, wherein A mounting base plate (327) is fixedly mounted on the all-wheel drive traction chassis, and one end of the electric push rod (321) and the connecting rod (326) are both rotatably connected to the mounting base plate (327).

3. The front crawler belt of the all-wheel drive traction chassis according to claim 1, characterized in that The lifting arm (324) is a "door" shaped frame, and a swing arm (325) is installed on both sides of the bottom of the lifting arm (324).

4. The front crawler belt of the all-wheel drive traction chassis according to claim 1, characterized in that, A plurality of tension wheels (316) are mounted on the track wheel support frame (315).

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