Low-power-consumption loading wheel spoke

Abstract

The invention discloses a low-power-consumption loading wheel spoke and relates to the technical field of high-speed tracked vehicles, the low-power-consumption loading wheel spoke comprises a rubber tire, a rim and a wheel disc, the rubber tire sleeves the outer side of the rim, the rim sleeves the outer side of the wheel disc, the rubber tire is composed of an outer tire and an inner tire, and the outer edge of the side, away from the wheel disc, of the rim is provided with a first closing-in pressing edge; the inner edge of the side, close to the wheel disc, of the wheel rim is provided with a second closing-in pressing edge, and the second closing-in pressing edge is sprayed with a wear-resistant coating. Compared with an existing loading wheel spoke, the complete loading wheel spoke is composed of the rubber tire, the rim and the wheel disc, the rolling resistance of the loading wheel and the friction power consumption between the loading wheel and a crawler belt can be reduced, the heat dissipation condition can be improved, the heat dissipation performance of the loading wheel is improved, the tire burst risk during continuous driving is reduced, and the service life of the loading wheel is prolonged. Therefore, the maneuverability of the vehicle is comprehensively improved, the service life of the vehicle is comprehensively prolonged, heat generation can be reduced, the infrared characteristic of the tracked vehicle can be reduced, and the concealment and safety of the tracked vehicle are improved to a certain extent.

Description

Technical Field

[0001] The invention relates to the technical field of high-speed tracked vehicles, and in particular to a low-power-consumption load-bearing wheel spoke. Background Art

[0002] The road wheel is a major component of the high-speed tracked vehicle's motion system. It is installed between the balance elbow and the track to support the vehicle body, compact the track to ensure adhesion between the track and the ground, and provide guidance for the track movement to ensure high maneuverability of the vehicle. The road wheel assembly consists of road wheel spokes, hubs, bearings, a wrap-around oil retaining ring and axle head cover. The spokes and hubs are generally fastened with bolts.

[0003] In the field of high-speed tracked vehicle engineering, the transmission efficiency and driving force conversion efficiency of the tracked driving system are much lower than those of the wheeled driving system. According to actual measurements, the efficiency during high-speed driving is only 50-60%. Among them, the power consumption caused by the rolling resistance of the road wheels accounts for the largest proportion, reaching 40-50% of the total system power consumption. It will increase significantly when driving on off-road roads, greatly limiting the maneuverability of the vehicle. In addition, the huge power consumption is converted into heat, and the heat problem can easily cause the road wheels to burst, increase the infrared characteristics of the vehicle, and reduce the vehicle's battlefield safety. Therefore, the present invention proposes a low-power road wheel spoke to solve the problems existing in the prior art. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to propose a low-power road wheel spoke, which solves the problems of large rolling resistance, high power consumption due to friction with the track, poor heat dissipation performance, easy risk of tire blowout, and difficulty in reducing the infrared characteristics of the vehicle.

[0005] In order to achieve the purpose of the present invention, the present invention is implemented through the following technical scheme: a low-power load-bearing wheel spoke, including a tire, a rim and a wheel disc, the tire is sleeved on the outside of the rim, the rim is sleeved on the outside of the wheel disc, the tire is composed of an outer tire and an inner tire, the outer edge of the rim away from the wheel disc is provided with a first closing edge, the inner edge of the rim close to the wheel disc is provided with a second closing edge, the second closing edge is sprayed with a wear-resistant coating, the second closing edge is provided with a welding edge on the side close to the wheel disc and is welded and fixed to the wheel disc, and the wheel disc is designed to be conical.

[0006] A further improvement is that: the wheel disc is provided with weight-reducing holes which are distributed in an annular shape and at equal intervals, and the inner wall of the wheel disc on one side close to the first closing edge is provided with a chamfered edge.

[0007] A further improvement is that the outer tube is made of F-7N rubber, the inner tube is made of F-4C rubber, and the rubber tire is made of the outer tube and the inner tube by using a composite rubber rubber tire combination technology.

[0008] A further improvement is that the elastic modulus of the outer tube and the inner tube are both greater than or equal to 6 MPa, the thickness of the outer tube is 10 mm, and the thickness of the inner tube is 20 mm.

[0009] A further improvement is that the wheel rim and the wheel disc are both formed by stamping, and the wheel rim and the wheel disc are both made of Al-Cu alloy.

[0010] A further improvement is that the wheel disc is interference fit inside the wheel rim and supported at the center of the wheel rim.

[0011] A further improvement is that the wear-resistant coating is made of a nickel-based self-fluxing alloy material and the hardness is designed to be a gradient.

[0012] A further improvement is that: the first closing edge is pressed inwardly and is designed to be inclined, and the second closing edge is pressed inwardly and is designed to be arc-shaped.

[0013] The beneficial effects of the present invention are as follows: the present invention forms a complete road wheel spoke through the rubber tire, the rim and the wheel disc. Compared with the existing road wheel spoke, the present invention can not only reduce the rolling resistance of the road wheel and the power consumption of the friction between the road wheel and the track, but also improve the heat dissipation conditions, improve the heat dissipation performance of the road wheel, and reduce the risk of tire blowout during continuous driving, thereby comprehensively improving the maneuverability and service life of the vehicle, while also reducing heat generation, and is beneficial to reducing the infrared characteristics of the tracked vehicle, which improves the concealment and safety of the tracked vehicle to a certain extent, and is worthy of wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a cross-sectional view of a road wheel spoke of the present invention;

[0015] Figure 2 is a front view of the spokes of the road wheel of the present invention;

[0016] Figure 3 It is a schematic diagram of the guiding effect of the road wheel spokes on the track of the present invention.

[0017] Among them: 1. rubber tire; 2. wheel rim; 3. wheel disc; 4. weight-reducing hole; 5. chamfered edge; 6. road wheel; 7. track; 8. guide tooth; 101. outer tire; 102. inner tire; 201. first closing edge; 202. second closing edge; 203. welding edge. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] High-speed tracked vehicles are a type of mobile platform with strong off-road capabilities, widely used in military and industrial fields. They contact the ground through tracks, providing better traction and stability than wheeled vehicles, especially on rough or soft ground. High-speed tracked vehicles are an indispensable part of modern military and industrial fields. Their design and manufacture involve a variety of advanced technologies, and as technology continues to advance, the performance of these vehicles will continue to improve to meet the growing market demand;

[0020] The road wheel is a major component of the high-speed tracked vehicle locomotion system. The road wheel assembly consists of a road wheel spoke, a hub, a bearing, a wrap-around oil retaining ring and an axle head cover. Most existing road wheel spokes have the disadvantages of large rolling resistance, high power consumption due to friction with the track, poor heat dissipation, and the risk of tire blowout, as well as being unfavorable for reducing the vehicle's infrared characteristics.

[0021] For the problems existing in the above-mentioned prior art, see Figure 1 , Figure 2 , Figure 3 This embodiment provides a low-power load-bearing wheel spoke, which is composed of a tire 1, a rim 2 and a wheel disc 3, wherein the tire 1 is located at the outermost side and is sleeved on the outer wall of the rim 2, the wheel disc 3 is located at the innermost side, and the rim 2 is sleeved on the outer side of the wheel disc 3;

[0022] The main functions of the tire 1 are vibration reduction and load bearing. In addition to tire blowouts caused by heat, common failure modes of the tire 1 also include cuts and punctures of the outer layer by sharp objects such as stones. In this regard, the tire 1 of this embodiment is made of an outer tire 101 and an inner tube 102 using a composite rubber tire combination technology, and has the characteristics of high elastic modulus, low viscoelastic hysteresis and strong heat resistance. The outer tire 101 is made of F-7N rubber with high strength and strong tear resistance, which can effectively resist the shearing of sharp objects such as stones, and can effectively resist the shearing and tearing of stones and other debris on the road wheel, greatly extending the service life. The inner tube 102 is made of F-4C rubber and used as a vibration reduction layer to buffer the strong impact of the road wheel when driving on an off-road road. It has the characteristics of low viscoelastic hysteresis and strong heat resistance.

[0023] The outer edge of the wheel rim 2 away from the wheel disc 3 is provided with a first closing edge 201, which is closed inwardly and inclined to increase the strength of the edge of the wheel rim 2 to prevent deformation caused by the concentration of all impact loads when the edge of the wheel rim 2 hits an obstacle. The inner edge of the wheel rim 2 close to the wheel disc 3 is provided with a second closing edge 202, which is closed inwardly and has an arc shape to form a larger annular contact area, and is sprayed with a wear-resistant coating. The wear-resistant coating is used to replace the traditional steel wear-resistant ring to further achieve lightweight. The second closing edge 202 is provided with a welding edge 203 on the side close to the wheel disc 3 and is welded and fixed to the wheel disc 3. The structural connection strength is improved by welding and water seepage is prevented.

[0024] The wheel disc 3 is designed in a conical shape. The conical design of the wheel disc 3 makes it have a strong load-bearing capacity. Through thermodynamic analysis, it can be known that the heat-generating part of the road wheel is the core of the tire 1. The heat and heat accumulation generated by the tire 1 during the driving process of the vehicle are important influencing factors for tire blowout and high-temperature degeneration. Therefore, the wheel rim 2 and the wheel disc 3 of this embodiment are both stamped, and the wheel disc 3 is inserted into the inner side of the wheel rim 2 and supported in the central position of the wheel rim 2, that is, the part facing the core of the tire 1. This not only enhances the rigidity of the road wheel, but also can export the heat in time and dissipate the heat through the wheel disc 3. The wheel rim 2 and the wheel disc 3 are both made of Al-Cu alloy. The selection of Al-Cu alloy, on the one hand, ensures that it has high strength while ensuring lightweight, and on the other hand, it makes the wheel rim 2 and the tire 1 have better adhesion.

[0025] The wheel disc 3 is provided with weight-reducing holes 4 which are evenly distributed in a circular shape, which play a role in reducing weight and further lighten the road wheel. The inner wall of the wheel disc 3 on one side close to the first closing edge 201 is provided with a chamfered edge 5.

[0026] The elastic modulus of the outer tire 101 and the inner tire 102 are both greater than or equal to 6 MPa. The total thickness of the tire 1 is 30 mm, the thickness of the outer tire 101 is 10 mm, and the thickness of the inner tire 102 is 20 mm. The above parameter design can not only ensure that the tire 1 has sufficient strength, but also reduce the rolling power consumption of the road wheel and the heat generation of the rubber.

[0027] The wear-resistant coating is made of a nickel-based self-fluxing alloy material having good adhesion to the wheel disc 3 material, and its hardness is designed to be a gradient to reduce crack resistance.

[0028] In the design process of a low-power load-bearing wheel spoke provided in this embodiment, the following four power consumption effects are considered from the perspective of reducing rolling resistance and power consumption:

[0029] (1) Power consumption of rolling resistance of road wheels

[0030] In the prior art, the main elastic medium of the pneumatic tire is gas, the power consumption caused by the deformation of the rubber tire is small, and the gas can flow, and the generated heat is easily transferred to the rim, and the heat dissipation condition is good. The elastic component of the road wheel is a solid rubber tire, and the rubber layer generates elastic hysteresis energy loss during the deformation process due to the internal friction of the viscoelastic material; when the road wheel rolls, although the deformation of the corresponding points before and after the normal line is the same, due to the elastic hysteresis phenomenon, the ground normal reaction force in the front part of the compression process will be greater than the ground normal force reaction force in the recovery process; because the distribution of the ground normal reaction force is not symmetrical before and after, their combined force moves forward a distance relative to the normal line, forming a rolling resistance pair, and the rolling resistance forms elastic energy hysteresis loss, generating power consumption;

[0031] Remember E p is the elastic modulus of rubber, which is about 4.9~7.84MPa, C is the coefficient, which is usually 1.1~1.3, and the power consumption can be expressed as:

[0032]

[0033] In the formula, μ is the power consumption coefficient caused by the internal friction of the rubber, which is generally 0.2-0.3, Q is the load, H is the thickness of the rubber layer, and R is the outer diameter of the road wheel. It can be seen that the single wheel load, wheel diameter, width, rubber thickness, material elastic modulus and power consumption factor will all affect the rolling power consumption of the road wheel, and the power consumption can be reduced through priority design.

[0034] Through the above model, the following design principles can be summarized:

[0035] ① Power consumption and load Q 3 / 2 This means that increasing the number of road wheels can reduce power consumption by reducing static loads, and reducing rolling power consumption by reducing dynamic loads. This can be solved by optimizing suspension parameters.

[0036] ②Power consumption and radius R 1 / 6 Inversely proportional, increasing the outer diameter of the road wheel can reduce power consumption, but the sensitivity is lower and it is not as effective as increasing the width;

[0037] ③Power consumption and adhesive layer thickness H 1 / 3 Proportionately, reducing thickness can reduce power consumption;

[0038] ④E p Rubber elastic modulus and power consumption coefficient μ. Increasing the elastic modulus of the rubber material and reducing the viscoelastic hysteresis characteristics can reduce power consumption. Among them, the most sensitive one is to reduce the viscoelastic hysteresis characteristics of the material.

[0039] (2) Power consumption due to friction between the road wheel and the guide gear

[0040] By observing the crawler's driving action, it is found that even when driving on a straight road, the crawler does not move in a straight line due to its own curvature and uneven ground. Instead, it swings back and forth between the two rims under the limiting effect of the guide teeth. Frequent squeezing and collisions generate friction power consumption and cause wear, such as Figure 3 As shown, reference numeral 6 indicates a road wheel composed of the wheel spokes of the present invention, 7 indicates a crawler track, and 8 indicates a guide tooth on the crawler track, wherein the front road wheel 6 has a guiding effect on the crawler track 7, and by acting with the guide tooth 8, it forces the crawler shoe that is about to enter the ground section to be located directly in front of the wheel. When the vehicle turns, the crawler track 7 rotates with the vehicle body under the lateral force of the road wheel 6, and at this time, the road wheel 6 moves relative to the guide tooth 8, generating friction power consumption;

[0041] To facilitate introduction, the guide tooth 8 and the inner edge of each wheel will be designed with a certain side angle β (also known as the run-up angle, which is about 6-8° with the vertical direction); during the friction process, the positive pressure is the radial load F, including wheel load, preload, traction, etc., and the equivalent sliding distance is l; in the actual calculation process, the two wheel rims have a certain distance, and the guide tooth 8 is the power consumption caused by the back-and-forth friction between the two wheel rims, rather than continuous friction, so the collision coefficient ε is introduced to represent the duty cycle in time. Assuming that the number of frictions per second is v / L, the friction power consumption of the guide tooth 8 and each wheel is:

[0042]

[0043] Due to the uncertainty of the duty cycle of the collision, it is difficult to calculate accurately, but it is certain that reducing the friction coefficient is a more realistic way to reduce consumption;

[0044] (3) Power consumption of track impact on the ground

[0045] When the tracked vehicle is traveling, the track that is about to touch the ground rotates around the center of the pin ear under the push of the front road wheel of the vehicle, and then quickly touches the ground to provide a rolling path for the road wheel;

[0046] In this process, the track shoes go from a speed of 2v to zero in both horizontal and vertical directions after hitting the ground, that is, all the kinetic energy of the track shoes is absorbed by the ground. m is the mass of each track shoe, L is the pitch, v is the vehicle speed, and the number of track shoes passing the first road wheels on both sides of the vehicle body per second is 2v / L. The power consumption of track hitting is:

[0047]

[0048] Obviously, increasing the radius of the road wheels can significantly reduce the power consumption of the slap;

[0049] (4) Power consumption caused by the track rolling over uneven road surface

[0050] Assuming the impact force is F, and the direction is from the contact point to the center of the road wheel, at the moment of impact, due to the large suspension stiffness, the wheel has no time to move instantly, so the horizontal resistance on the wheel can be expressed as:

[0051]

[0052] In the formula, R is the radius of the road wheel, and q is the height of the contact point between the uneven road surface and the road wheel;

[0053] The above formula shows that the resistance caused by uneven road surface to the road wheels depends on the size of the obstacle relative to the wheel and the stiffness of the suspension. Obviously, increasing the radius of the road wheels and reducing the stiffness and damping of the suspension can reduce the resistance caused by uneven road surface.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A low-power load-bearing wheel spoke, comprising a rubber tire (1), a wheel rim (2) and a wheel disc (3), characterized in that: The rubber tire (1) is sleeved on the outer side of the wheel rim (2), and the wheel rim (2) is sleeved on the outer side of the wheel disc (3). The rubber tire (1) is composed of an outer tire (101) and an inner tire (102). The outer edge of the wheel rim (2) away from the wheel disc (3) is provided with a first closing edge (201), and the inner edge of the wheel rim (2) close to the wheel disc (3) is provided with a second closing edge (202). A wear-resistant coating is sprayed on the second closing edge (202). The second closing edge (202) is provided with a welding edge (203) on the side close to the wheel disc (3) and is welded and fixed to the wheel disc (3). The wheel disc (3) is designed to be conical.

2. The low power consumption road wheel spoke according to claim 1, characterized in that: The wheel disc (3) is provided with weight-reducing holes (4) which are distributed in an annular shape and at equal intervals, and the inner wall of one side of the wheel disc (3) close to the first closing edge (201) is provided with a chamfered edge (5).

3. The low power consumption road wheel spoke according to claim 1, characterized in that: The outer tire (101) is made of F-7N rubber, the inner tire (102) is made of F-4C rubber, and the rubber tire (1) is made of the outer tire (101) and the inner tire (102) by using a composite rubber tire combination technology.

4. The low power consumption road wheel spoke according to claim 1, characterized in that: The elastic modulus of the outer tire (101) and the inner tire (102) are both greater than or equal to 6 MPa, the thickness of the outer tire (101) is 10 mm, and the thickness of the inner tire (102) is 20 mm.

5. The low power consumption road wheel spoke according to claim 1, characterized in that: The wheel rim (2) and the wheel disc (3) are both formed by stamping, and the wheel rim (2) and the wheel disc (3) are both made of Al-Cu alloy.

6. The low power consumption road wheel spoke according to claim 1, characterized in that: The wheel disc (3) is interference fit inside the wheel rim (2) and is supported at the center of the wheel rim (2).

7. The low power consumption road wheel spoke according to claim 1, characterized in that: The wear-resistant coating is made of nickel-based self-fluxing alloy material, and the hardness is designed to be gradient.

8. The low power consumption road wheel spoke according to claim 1, characterized in that: The first closing edge (201) is closed inwardly and has an inclined design, and the second closing edge (202) is closed inwardly and has an arc design.

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