CN113650689A

CN113650689A - Cycloidal profile engaging track assembly

Info

Publication number: CN113650689A
Application number: CN202111093923.2A
Authority: CN
Inventors: 王磊
Original assignee: Huainan Union University
Current assignee: Huainan Union University
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2021-11-16
Anticipated expiration: 2041-09-17
Also published as: CN113650689B

Abstract

The invention relates to a crawler technology, which is used for solving the problems that the teeth of a driving wheel collide with a crawler engaging hole when a crawler is started and stopped, and the crawler is easy to break and is not easy to replace, in particular to a cycloidal profile engaging crawler assembly; according to the invention, the meshing holes with cycloid meshing profiles are formed in the chain plate block, the driving wheel with the same cycloid profile gear teeth is adopted, and the cycloidal meshing between the driving wheel and the crawler is realized, so that at any moment, the gear teeth of the driving wheel are in contact with the crawler, the problem that the gear teeth collide and hit the meshing holes when the crawler and the driving wheel start and stop is avoided, the running stability is ensured, in addition, the contact points between the driving wheel and the crawler are distributed on two sides of the chain plate block, the moment arm length of the torque applied to the chain plate block when the chain plate block is pressed to the bulge is effectively reduced, the condition of breakage of the chain plate block is avoided, and the pin shaft which is easier to replace and has lower wear speed is adopted, so that the crawler which is accidentally broken or aged is easier to replace and maintain.

Description

Cycloidal profile engaging track assembly

Technical Field

The invention relates to the technology of tracks, in particular to a cycloidal profile meshing track assembly.

Background

Many working machines such as bulldozers and excavators use a crawler as a ground engaging propulsion element, and the crawler as a traveling mechanism for outdoor off-road equipment can ensure its trafficability on a road-free ground and reduce its traveling resistance. The track is usually a closed chain ring formed by mutually hinging a plurality of track sections, supports the bogie wheels and provides a continuously rolling track for the bogie wheels, and the traction force, the adhesive force and the braking force of the ground are transferred to the vehicle body through the interaction with the ground, so that the normal motion of the vehicle body is ensured.

At present, the existing caterpillar band still has shortcomings, the driving mode of the caterpillar band is that a gear-shaped driving wheel drives the caterpillar band to rotate, gear teeth of the driving wheel enter meshing holes of the caterpillar band in order to be meshed smoothly, most of the gear teeth are smaller than the meshing holes, namely, the gear teeth and the meshing holes are in clearance fit, so that the gear teeth frequently collide in the starting and stopping process of driving the caterpillar band to stop or start to advance, accelerated aging of the driving wheel and the caterpillar band is caused, the service life of the driving wheel and the caterpillar band is shortened, secondly, the joints of the driving wheel and the caterpillar band of most of the caterpillar band are located in the middle section of a chain plate block, and therefore if two ends of the chain plate block bear larger shearing stress, the breakage of the chain plate block is easily caused; the connection between each chain plate of track all realizes through interference fit's round pin axle, and interference fit can accelerate the wearing and tearing of round pin axle to reduce the life of round pin axle, increase use cost.

In view of the above technical problem, the present application proposes a solution.

Disclosure of Invention

The invention realizes that the gear teeth of the driving wheel have contact points with the track at any moment by arranging the meshing holes with cycloid meshing profiles on the chain plate block and adopting the driving wheel with the gear teeth with cycloid profile, so that the problem that the gear teeth collide and hit the meshing holes when the track and the driving wheel are started and stopped is avoided, and the running stability is ensured.

The purpose of the invention can be realized by the following technical scheme:

the cycloid contour meshing track assembly comprises a vehicle plate, wherein a swing arm is rotatably connected above the vehicle plate through a rotor, the swing arm is movably connected with the rotor through a lifting cylinder, two sides of the rotor are respectively and movably connected with a rotating cylinder, a telescopic cylinder is sleeved in the swing arm, a cycloid track assembly is arranged below the vehicle plate and is divided into a frame unit and a chain plate unit, the frame unit is fixedly connected to the lower surface of the vehicle plate, and the chain plate unit is wound on the outer wall of the frame unit;

the chain plate unit comprises a plurality of chain plate blocks connected end to end, the chain plate block is including left meshing unit, right meshing unit and guide unit, left side meshing unit and right meshing unit set up at guide unit bilateral symmetry, meshing hole has all been seted up in vertical direction to left side meshing unit and right meshing unit, meshing hole runs through left meshing unit and right meshing unit along vertical direction, meshing hole inner wall is seted up along the cycloid profile, and the curvilinear equation of cycloid is:

where r is the radius of the circle and t is the roll angle.

As a preferred embodiment of the present invention, the left engaging unit and the right engaging unit are both provided with two sets of pin holes, one set of pin holes simultaneously penetrates through the left engaging unit and the right engaging unit, the other set of pin holes simultaneously penetrates through the left engaging unit, the right engaging unit and the guiding unit, one side of the guiding unit, which is away from the left engaging unit, is also provided with a pin hole, the pin hole is used for connecting the next set of link plate blocks, and a pin shaft is inserted into each set of pin holes.

As a preferred embodiment of the present invention, the frame unit includes a wheel carrier, a driving wheel, a supporting wheel, a traveling wheel, a tensioning mechanism and a guide wheel, the wheel carrier is fixedly mounted on the lower surface of the vehicle body, the driving wheel is rotatably connected to one end of the wheel carrier, the upper surface of the wheel carrier is rotatably connected to the supporting wheel through a bearing seat, the lower surface of the wheel carrier is rotatably connected to the traveling wheel through a bearing seat, the other end of the wheel carrier is provided with the tensioning mechanism, and the wheel carrier is movably connected to the guide wheel through the tensioning mechanism.

In a preferred embodiment of the present invention, both ends of the link plate unit are wound around the driving wheel and the guide wheel, the upper part of the link plate unit is overlapped on the upper surface of the support wheel, and the bottom part of the link plate unit is wound under the traveling wheel.

In a preferred embodiment of the present invention, the tensioning mechanism is composed of an outer sleeve and a threaded rod, the threaded rod is connected inside the outer sleeve in a threaded manner, and one end of the threaded rod exposed out of the outer sleeve is connected with the guide wheel.

As a preferred embodiment of the present invention, a plurality of sets of gear teeth are fixedly mounted on an outer wall of the driving wheel, an outer contour of each gear tooth is also a cycloidal contour, the gear teeth are cycloidal-meshed with the meshing holes, the driving wheel is in a dumbbell shape, and the guide unit is slidably connected to a middle portion of the driving wheel.

As a preferred embodiment of the present invention, a nut is installed at one end of the pin shaft, an expansion section is disposed at the other end of the pin shaft, a wedge-shaped notch is disposed on a side wall of the expansion section, a threaded hole is disposed inside the expansion section, and a bolt is connected to the threaded hole through an internal thread.

In a preferred embodiment of the present invention, the front end of the bolt is cylindrical, and a portion near the nut is truncated cone-shaped with a gradually increasing diameter.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the meshing hole with the cycloid meshing profile is formed in the chain plate block, and the driving wheel with the cycloid profile gear teeth is adopted, so that the structure becomes more compact, a larger transmission ratio can be obtained, meanwhile, the contact stress is small because the tooth profile has larger contact ratio, the improvement of bending strength is facilitated, the abrasion is uniform, and through the cycloid meshing of the driving wheel and the crawler, the gear teeth of the driving wheel have contact points with the crawler at any moment, so that the problem that the gear teeth collide and hit the meshing hole when the crawler and the driving wheel start and stop can not occur, and the driving stability is ensured.

2. According to the invention, the contact points of the driving wheel and the crawler are distributed on the two sides of the chain plate block, so that the middle point of the supporting point of the chain plate block is changed into the middle point of the two sides, when one side of the chain plate block is pressed to the bulge, the arm of force length of the torque applied to the side, pressed to the bulge, of the chain plate block is effectively reduced, and the condition of chain plate block fracture is avoided.

3. The invention adopts the pin shaft which is easier to replace and has lower abrasion speed, so that the two ends of the pin shaft are respectively limited by the screw caps and the expansion sections, the pin shaft is ensured not to fall off from the crawler belt, and the position of the pin shaft, which is contacted with the chain plate block, can adopt the interference fit with the minimum interference as zero, thereby effectively reducing the requirement on the processing precision of a matching surface, ensuring that the assembly and the disassembly are more convenient, and ensuring the service life and the use effect of the pin shaft.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic front view of the structure of the present invention;

FIG. 2 is a schematic structural view of a cycloid track assembly of the present invention;

FIG. 3 is a schematic view of the link plate block structure of the present invention;

FIG. 4 is a schematic view of the connection structure of multiple groups of link joint blocks of the present invention;

FIG. 5 is an enlarged view of the structure at A in FIG. 2 according to the present invention;

FIG. 6 is a schematic view of the driving wheel and track combination of the present invention;

FIG. 7 is a schematic cross-sectional view of a pin shaft according to the present invention;

fig. 8 is a schematic view of the pin structure of the present invention.

In the figure: 1. turning a plate; 2. a rotor; 3. swinging arms; 4. a lift cylinder; 5. a rotating cylinder; 6. a telescopic cylinder; 7. a cycloid track assembly; 8. a link plate unit; 801. a left engagement unit; 802. a right engagement unit; 803. a guide unit; 804. an engagement hole; 9. a frame unit; 901. a wheel carrier; 902. a drive wheel; 903. a support wheel; 904. a traveling wheel; 905. a tensioning mechanism; 906. a guide wheel; 10. a chain plate block; 11. a pin shaft; 12. a bolt; 13. an expansion section.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1-6, the cycloidal profile-engaged track assembly includes a vehicle plate 1, a swing arm 3 rotatably connected to the upper portion of the vehicle plate 1 via a rotor 2, the swing arm 3 movably connected to the rotor 2 via a lifting cylinder 4, the lifting cylinder 4 being capable of controlling a lifting angle of the swing arm 3 by extending and retracting, the swing arm 3 has a larger working range, the two sides of the rotor 2 are respectively movably connected with a rotating cylinder 5, the rotating cylinders 5 can control the rotation of the rotor 2 by the extension and the shortening of the mutual alternate matching, a telescopic cylinder 6 is sleeved in the swing arm 3, a cycloid caterpillar track assembly 7 is arranged below the sweep 1, the cycloidal track assembly 7 is used for controlling the movement of the sweep 1, the cycloidal track assembly 7 is divided into a frame unit 9 and a chain plate unit 8, the frame unit 9 is fixedly connected to the lower surface of the sweep 1, the frame unit 9 is of a high-strength structure and used for supporting a vehicle body, and the chain plate unit 8 is wound on the outer wall of the frame unit 9;

the chain plate unit 8 is composed of a plurality of chain plate blocks 10 connected end to form an annular mechanism, the chain plate block 10 comprises a left engaging unit 801, a right engaging unit 802 and a guiding unit 803, the left engaging unit 801 and the right engaging unit 802 are symmetrically arranged on two sides of the guiding unit 803, the left engaging unit 801 and the right engaging unit 802 have the same structure, the left engaging unit 801 and the right engaging unit 802 are both provided with an engaging hole 804 in the vertical direction, the engaging hole 804 penetrates through the left engaging unit 801 and the right engaging unit 802 in the vertical direction, the inner wall of the engaging hole 804 is provided along the contour of a cycloid, when the curve figure of the cycloid is a circle moving along a straight line, the track formed by a fixed point on the circle boundary, and a driving wheel 902 with the same gear teeth of the cycloid contour of the cycloid is adopted, so that the structure becomes more compact, a larger transmission ratio can be obtained, and the curve equation of the cycloid is:

wherein r is radius of circle, and t is the roll angle, and because the flank profile has great contact ratio again, contact stress is little, is favorable to the improvement of bending strength, and wearing and tearing are even, and the both ends of chain joint unit 8 connect around in drive wheel 902 and leading wheel 906 outside, through the cycloid meshing of drive wheel 902 and track, realize at any moment, the teeth of a cogwheel of drive wheel 902 all has the contact point with the track to the problem that the meshing hole 804 was hit in the teeth of a cogwheel collision can not appear when track and drive wheel 902 open and stop, has guaranteed the stationarity of traveling. The upper part of the chain plate unit 8 is lapped on the upper surface of the supporting wheel 903 and is used for supporting the crawler belt stretching over the supporting wheel 903, and the bottom of the chain plate unit 8 is wound under the traveling wheel 904 to assist in supporting the wheel carrier 901 and enable the chain plate unit to be sleeved inside the crawler belt.

Example two:

referring to fig. 1-2, the cycloidal profile meshing track assembly includes a vehicle plate 1, a swing arm 3 is rotatably connected above the vehicle plate 1 through a rotor 2, the swing arm 3 is movably connected with the rotor 2 through a lifting cylinder 4, the lifting cylinder 4 can control a lifting angle of the swing arm 3 through extension and shortening, so that the swing arm 3 has a larger working range, two sides of the rotor 2 are respectively movably connected with a rotating cylinder 5, the rotating cylinders 5 can control rotation of the rotor 2 through extension and shortening which are alternately matched with each other, a telescopic cylinder 6 is sleeved inside the swing arm 3, a cycloidal track assembly 7 is arranged below the vehicle plate 1 and used for controlling movement of the vehicle plate 1, the cycloidal track assembly 7 is divided into a frame unit 9 and a chain plate unit 8, the frame unit 9 is fixedly connected to a lower surface of the vehicle plate 1, and the frame unit 9 is of a high-strength structure and used for supporting a vehicle body;

the frame unit 9 comprises a wheel frame 901, a driving wheel 902, a supporting wheel 903, a traveling wheel 904, a tensioning mechanism 905 and a guide wheel 906, wherein the wheel frame 901 is fixedly arranged on the lower surface of the vehicle plate 1 and used for supporting the vehicle plate 1, the driving wheel 902 is rotationally connected to one end of the wheel frame 901, the driving wheel 902 can be controlled by a driving mechanism to rotate, two groups of driving wheels 902 on two sides can rotate independently, the upper surface of the wheel frame 901 is rotationally connected with the supporting wheel 903 through a bearing seat and used for supporting a crawler across the supporting wheel 903, the lower surface of the wheel frame 901 is rotationally connected with the traveling wheel 904 through the bearing seat, the auxiliary driving wheel 902 and the guide wheel 906 support the wheel frame 901, the other end of the wheel frame 901 is provided with the tensioning mechanism 905, the tensioning mechanism 905 comprises an outer sleeve and a threaded rod, the threaded rod is in threaded connection with the inner part of the outer sleeve, one end of the threaded rod, which is exposed out of the outer sleeve, is connected with the guide wheel 906, and the threaded rod is rotationally connected with the guide wheel 906, therefore, when the threaded rod rotates, the guide wheel 906 is not affected, the wheel frame 901 is movably connected with the guide wheel 906 through the tensioning mechanism 905, a plurality of groups of gear teeth are fixedly installed on the outer wall of the driving wheel 902, the outer contour of the gear teeth is also in a cycloidal contour, the gear teeth are in cycloidal meshing with the meshing hole 804, so that the tooth profile has larger contact ratio, the contact stress is small, the improvement of bending strength and uniform abrasion are facilitated, the driving wheel 902 is in a dumbbell shape, the guide unit 803 is slidably connected to the middle concave part of the driving wheel 902, the higher parts of the two ends of the driving wheel 902 are in meshed connection with the meshing hole 804, the contact points of the driving wheel 902 and the crawler are distributed on the two sides of the chain plate 10, so that the supporting point of the chain plate 10 is changed from the middle point to the two sides of the middle point, when one side of the chain plate 10 is pressed to be convex, the moment arm length of the torque applied to one side of the chain plate 10 is effectively reduced, the occurrence of the condition that the chain plate block 10 is broken is avoided.

Example three:

referring to fig. 7-8, the cycloidal profile-engaged track assembly includes a vehicle plate 1, a swing arm 3 rotatably connected to the upper portion of the vehicle plate 1 via a rotor 2, the swing arm 3 movably connected to the rotor 2 via a lifting cylinder 4, the lifting cylinder 4 being capable of controlling a lifting angle of the swing arm 3 by extending and retracting, the swing arm 3 has a larger working range, the two sides of the rotor 2 are respectively movably connected with a rotating cylinder 5, the rotating cylinders 5 can control the rotation of the rotor 2 by the extension and the shortening of the mutual alternate matching, a telescopic cylinder 6 is sleeved in the swing arm 3, a cycloid caterpillar track assembly 7 is arranged below the sweep 1, used for controlling the movement of the sweep 1, the cycloid caterpillar track assembly 7 is divided into a frame unit 9 and a chain plate unit 8, the chain plate unit 8 is composed of a plurality of groups of chain plate blocks 10, the link plate block 10 is composed of a left engagement unit 801, a right engagement unit 802 and a guide unit 803 in the middle;

the left engaging unit 801 and the right engaging unit 802 are both provided with two sets of pin holes, the two pin holes are respectively located at two ends of the left engaging unit 801 and the right engaging unit 802, one set of pin holes simultaneously penetrates through the left engaging unit 801 and the right engaging unit 802, the other set of pin holes simultaneously penetrates through the left engaging unit 801, the right engaging unit 802 and the guiding unit 803, the guiding unit 803 is connected between the left engaging unit 801 and the right engaging unit 802 in series, the three are connected, meanwhile, because the guiding unit 803 can rotate on the pin shaft 11, the guiding unit 803 can also rotate between the left engaging unit 801 and the right engaging unit 802, so that the whole rotatable node of the crawler is more, the crawler is more flexible in rotation, the external outlines of the driving wheel 902 and the guiding wheel 906 are better attached, in addition, because the walking environment of the crawler is generally harsh, therefore, the situation that the chain plate blocks 10 are damaged often occurs in the use process of the crawler belt, only damaged units in the chain plate blocks 10 need to be replaced when the crawler belt is replaced, the whole chain plate block 10 does not need to be replaced, the maintenance cost is reduced, a pin hole is also formed in one side, away from the left meshing unit 801, of the guide unit 803, the pin hole is used for connecting the next group of chain plate blocks 10, multiple groups of chain plate blocks 10 are connected in series and finally combined into a ring shape, a pin shaft 11 penetrates through each group of pin holes, a nut is installed at one end of each pin shaft 11 and used for blocking the pin shaft 11 from one side to completely penetrate through the pin hole, an expansion section 13 is formed at the other end of each pin shaft 11 and used for blocking the pin shaft 11 from the other side to completely penetrate through the pin hole, a wedge-shaped notch is formed in the side wall of each expansion section 13, the wedge-shaped notch can be extruded and opened, a threaded hole is formed in the expansion section 13, and is internally threaded with a bolt 12, the front end of the bolt 12 is cylindrical and is used for being connected with the inside of the pin shaft 11, and the part close to the nut is in a circular truncated cone shape with the diameter gradually increased, so that when the bolt 12 enters, the wedge-shaped notch of the expansion section 13 is jacked open, and the diameter of the expansion section 13 is increased. In the use of round pin axle 11, most of all adopt interference fit to guarantee that round pin axle 11 can not drop from the track tie point, but this kind of connected mode can make the round pin hole have very big pressure to round pin axle 11, thereby the wearing and tearing of round pin axle 11 with higher speed, and this kind of connected mode all needs special equipment when installation or dismantlement, be not convenient for install and dismantle, and artifical dismantlement is then time-consuming and energy-consuming again, it is spacing to set up nut and inflation section 13 respectively at the both ends of round pin axle 11, guarantee that round pin axle 11 can not drop from the track, and the position of contacting with chain plate 10 in round pin axle 11 then can adopt minimum interference to be zero interference fit, the requirement to the machining precision of fitting surface has been reduced effectively, make to install and remove more conveniently, the life and the result of use of round pin axle 11 have been guaranteed.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. The cycloid contour meshing crawler assembly comprises a vehicle plate (1), wherein a swing arm (3) is rotatably connected above the vehicle plate (1) through a rotor (2), the swing arm (3) is movably connected with the rotor (2) through a lifting cylinder (4), two sides of the rotor (2) are respectively movably connected with a rotating cylinder (5), and a telescopic cylinder (6) is sleeved in the swing arm (3), and the cycloid contour meshing crawler assembly is characterized in that a cycloid crawler assembly (7) is arranged below the vehicle plate (1), the cycloid crawler assembly (7) is divided into a frame unit (9) and a chain plate unit (8), the frame unit (9) is fixedly connected to the lower surface of the vehicle plate (1), and the chain plate unit (8) is wound on the outer wall of the frame unit (9);

chain plate unit (8) are formed by a plurality of chain plate pieces (10) end to end, chain plate piece (10) are including left meshing unit (801), right meshing unit (802) and guide element (803), left side meshing unit (801) and right meshing unit (802) are in guide element (803) bilateral symmetry setting, meshing hole (804) have all been seted up in vertical direction with right meshing unit (802) in left side meshing unit (801), meshing hole (804) run through left meshing unit (801) and right meshing unit (802) along vertical direction, meshing hole (804) inner wall is seted up along the profile of cycloid wheel, and the curvilinear equation of cycloid is:

where r is the radius of the circle and t is the roll angle.

2. The cycloidal profile-engaging track assembly according to claim 1, wherein the left engaging unit (801) and the right engaging unit (802) are provided with two sets of pin holes, one set of pin holes simultaneously penetrates through the left engaging unit (801) and the right engaging unit (802), the other set of pin holes simultaneously penetrates through the left engaging unit (801), the right engaging unit (802) and the guiding unit (803), one side of the guiding unit (803) far away from the left engaging unit (801) is also provided with pin holes, and a pin shaft (11) is arranged in each set of pin holes in a penetrating manner.

3. The cycloidal profile-meshing track assembly according to claim 1, wherein the frame unit (9) comprises a wheel carrier (901), a driving wheel (902), a supporting wheel (903), a traveling wheel (904), a tensioning mechanism (905) and a guide wheel (906), the wheel carrier (901) is fixedly installed on the lower surface of the vehicle plate (1), the driving wheel (902) is rotatably connected to one end of the wheel carrier (901), the upper surface of the wheel carrier (901) is rotatably connected with the supporting wheel (903) through a bearing seat, the lower surface of the wheel carrier (901) is rotatably connected with the traveling wheel (904) through a bearing seat, the other end of the wheel carrier (901) is provided with the tensioning mechanism (905), and the wheel carrier (901) is movably connected with the guide wheel (906) through the tensioning mechanism (905).

4. The cycloidal profile-engaging track assembly of claim 1, wherein the link plate unit (8) is wrapped around the drive wheel (902) and the guide wheel (906) at both ends, the upper portion of the link plate unit (8) overlaps the upper surface of the support wheel (903), and the bottom portion of the link plate unit (8) is wrapped around under the road wheel (904).

5. The cycloidal profile-engaging track assembly of claim 3, wherein the tensioning mechanism (905) is comprised of an outer sleeve and a threaded rod threaded within the outer sleeve, the end of the threaded rod exposed from the outer sleeve being connected to the idler wheel (906).

6. The cycloidal profile engagement track assembly of claim 3, wherein a plurality of sets of gear teeth are fixedly mounted on the outer wall of the driving wheel (902), the gear teeth are also cycloidal in profile, the gear teeth are cycloidal engaged with the engagement hole (804), the driving wheel (902) is dumbbell-shaped, and the guide unit (803) is slidably connected to the middle of the driving wheel (902).

7. The cycloidal profile-engaging track assembly of claim 2, wherein a nut is mounted on one end of said pin (11), an expansion section (13) is formed on the other end of said pin (11), a wedge-shaped notch is formed on the side wall of said expansion section (13), a threaded hole is formed in said expansion section (13), and a bolt (12) is screwed into said threaded hole.

8. The cycloidal profile-engaging track assembly of claim 7, wherein said bolt (12) is cylindrical at a forward end and has a frustoconical shape with a gradually increasing diameter adjacent the nut portion.