Chain wheel and chain structure of transfer case

Abstract

The utility model provides a transfer case chain wheel and chain structure which comprises chain wheels installed on the two sides in a transfer case and a chain arranged on the chain wheels in a sleeved mode, the chain is in meshed transmission connection with outer teeth of the chain wheels, and the chain is an annular chain formed by hinging a plurality of chain link units. Each chain link unit comprises a first pin shaft, a first chain plate set and a second chain plate set, the first chain plate set and the second chain plate set are installed on the first pin shaft, a plurality of first chain plates are distributed on the first chain plate set at intervals, and a plurality of second chain plates are distributed on the second chain plate set at intervals. The first chain plates and the second chain plates are rotationally arranged at intervals so that the corresponding tooth-shaped meshing faces can be attached to the outer teeth of the chain wheel, and the tooth-shaped meshing faces can be stably attached to the outer teeth of the chain wheel. When the chain is meshed with multiple pairs of teeth of the chain wheel, the tooth-shaped meshing surface of the chain is effectively meshed with the tooth-shaped surface of the chain wheel, and the bearing capacity of the chain wheel and the chain is fully reflected; the tensile stress of the chain plate is reduced, the reliability of the chain is improved, and the meshing noise of the chain wheel and the chain is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transfer cases, in particular to a sprocket chain structure of a transfer case. Background Art

[0002] The transfer case includes a transmission mechanism, a planetary reduction mechanism, and a shift actuator. The sprocket and chain are transmission mechanism components inside the transfer case. It consists of a driving sprocket, a driven sprocket, and a chain. The driving sprocket is installed on the rear drive output shaft, and the driven sprocket is installed on the front drive output shaft. The chain connects the driving sprocket and the driven sprocket together to achieve rotation and torque transmission.

[0003] During the rotation process, the chain and sprocket will have multiple pairs of teeth meshing at the same time, some of which begin to mesh, some are fully meshed, and some gradually move out of meshing. Therefore, the torque carried and transmitted by each pair of meshing teeth during the meshing process is changing, and the area of ​​tooth contact is also changing. If one or more pairs of tooth surfaces among the multiple pairs of gear teeth involved in the meshing are not in contact as they should be, the remaining meshing teeth will carry a greater torque and be overloaded, resulting in uneven transmission and impact, and unstable meshing will increase meshing noise. Utility Model Content

[0004] The technical problem solved by the utility model is to provide a transfer case sprocket chain structure with strong chain carrying capacity and low meshing noise, so as to solve the problems raised in the above background technology.

[0005] The technical problem solved by the utility model is achieved by the following technical solutions:

[0006] A transfer case sprocket chain structure comprises sprockets installed on both sides of the transfer case and chains sleeved on the sprockets, the chains are meshed and connected with the outer teeth of the sprockets;

[0007] The chain is composed of a plurality of groups of chain link units hingedly connected to form an annular chain, wherein the chain link units include a first pin shaft, a first chain plate group and a second chain plate group installed on the first pin shaft, a plurality of groups of first chain plates are arranged at intervals on the first chain plate group, a plurality of groups of second chain plates are arranged at intervals on the second chain plate group, the first chain plates and the second chain plates are staggered and serially connected on the first pin shaft, and a second pin shaft is further arranged on a side of the second chain plate away from the first chain plate to connect with another group of chain link units;

[0008] The first chain plate is integrally provided with two toothed protrusions, and a toothed meshing surface that is fitted with the outer teeth of the sprocket is provided between the two toothed protrusions. The first chain plate and the second chain plate have the same structure. The second chain plate is located on one side of the toothed meshing surface of the first chain plate and does not contact the outer teeth of the sprocket. That is, for a circularly rotating chain, the toothed meshing surface of the first chain plate should protrude from the outer tooth surface of the adjacent joint to fully improve the effective meshing of the toothed meshing surface of the chain with the toothed surface of the sprocket, thereby improving the load-bearing capacity of the sprocket and the chain and reducing the tensile stress of the chain plate.

[0009] As a further solution of the utility model:

[0010] The outer ends of both sides of the first pin shaft and the second pin shaft are respectively provided with baffles, and the two ends of the first pin shaft and the second pin shaft are abutted against the outer ends of the baffles. The baffles protrude from the toothed meshing surface of the second chain plate to limit the chain and prevent the chain from separating from the outer teeth of the sprocket. The outer end of the baffle is consistent in shape with the outer end of the second chain plate, thereby improving the consistency of the outer end side of the chain.

[0011] As a further solution of the utility model:

[0012] Pin holes are respectively provided on both sides of the first chain plate to connect with the first pin shaft and the second pin shaft. The toothed meshing surface is located at the outermost end of the two toothed protrusions and is an arc portion concentrically arranged with the corresponding pin holes to improve the consistency when contacting with the outer teeth of the sprocket.

[0013] As a further solution of the utility model:

[0014] The sprocket pressure angle is 31.5°, the sprocket pitch is 12.93 mm, the sprocket modulus is 4.1157 mm, and the sprocket displacement coefficient is -1.3422, at which time the meshing noise is minimal.

[0015] As a further solution of the utility model:

[0016] The sprocket includes a driving sprocket mounted on the rear output shaft of the transfer case and a driven gear mounted on the front output shaft of the transfer case. The driving sprocket is provided with an axial hole, and one side of the driving sprocket is also provided with an integral external spline sleeve. The driven gear is provided with an internal spline hole to connect with the spline shaft.

[0017] Compared with the prior art, the utility model has the following beneficial effects: when the driving sprocket, chain, and driven sprocket rotate and transmit torque, the chain meshes with the outer teeth of the sprocket through the first and second chain plates that are distributed, and the first and second chain plates are rotated at intervals so that the corresponding tooth meshing surfaces can be attached to the outer teeth of the sprocket, so that the tooth meshing surfaces and the outer teeth of the sprocket fit smoothly. When the chain and the sprocket mesh with multiple pairs of teeth, the tooth meshing surfaces of the chain and the tooth profile surfaces of the sprocket are effectively meshed, fully reflecting the load-bearing capacity of the sprocket and the chain; the tensile stress of the chain and chain plates is reduced, the reliability of the chain is improved, and the meshing noise of the sprocket and the chain is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the transfer case sprocket chain installation structure of the utility model;

[0019] Figure 2 It is a three-dimensional structural schematic diagram of the utility model;

[0020] Figure 3 This is a schematic diagram of the chain link unit structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the first chain plate structure of the utility model;

[0022] Figure 5 It is a schematic diagram of the Campbell analysis results of the present utility model;

[0023] Markings in the figure: 1. chain; 2. driving sprocket; 3. driven gear; 11. first pin shaft; 12. first chain plate; 13. second chain plate; 14. second pin shaft; 15. toothed protrusion; 16. toothed meshing surface; 17. baffle; 18. pin hole; 19. arc-shaped portion; 21. external spline sleeve; 31. internal spline hole. DETAILED DESCRIPTION

[0024] In order to make the technical means for realizing the utility model, creative features, objectives and effects easy to understand, the utility model is further explained below with reference to specific illustrations.

[0025] like Figures 1 to 5 As shown, this embodiment provides a transfer case sprocket chain structure, including sprockets installed on both sides of the transfer case and chains 1 sleeved on the sprockets, and the chain 1 is meshed and transmission-connected with the outer teeth of the sprockets;

[0026] The chain 1 is composed of a plurality of groups of chain link units hingedly connected to form an annular chain, wherein the chain link units include a first pin shaft 11, a first chain plate group 12 and a second chain plate group 13 installed on the first pin shaft 11, a plurality of groups of first chain plates 12 are arranged at intervals on the first chain plate group 12, a plurality of groups of second chain plates 13 are arranged at intervals on the second chain plate group 13, the first chain plates 12 and the second chain plates 13 are staggered and serially connected on the first pin shaft 11, and a second pin shaft 14 is further arranged on the side of the second chain plate 13 away from the first chain plate 12 to connect with another group of chain link units;

[0027] The first chain plate 12 is integrally provided with two toothed protrusions 15, and a toothed meshing surface 16 which is fitted with the outer teeth of the sprocket is provided between the two toothed protrusions 15. The first chain plate 12 and the second chain plate 13 have the same structure. The second chain plate 13 is located on the side of the toothed meshing surface 16 of the first chain plate 12 and does not contact the outer teeth of the sprocket. That is, for the chain 1 that rotates in an annular manner, the toothed meshing surface 16 of the first chain plate 12 should protrude from the outer tooth surface of the adjacent joint to fully improve the effective meshing of the toothed meshing surface 16 of the chain 1 with the toothed surface of the sprocket, thereby improving the load-bearing capacity of the sprocket and the chain 1 and reducing the tensile stress of the chain plate.

[0028] like Figure 2 , Figure 3 and Figure 4 As shown, baffles 17 are respectively provided at the outer ends of both sides of the first pin shaft 11 and the second pin shaft 14, and both ends of the first pin shaft 11 and the second pin shaft 14 are abutted against the outer ends of the baffles 17. The baffles 17 protrude from the toothed meshing surface 16 of the second chain plate 13 to limit the chain 1 and prevent the chain 1 from separating from the outer teeth of the sprocket. The outer end of the baffle 17 is consistent in shape with the outer end of the second chain plate 13, thereby improving the consistency of the outer end side of the chain 1.

[0029] Pin holes 18 are respectively provided on both sides of the first chain plate 12 to connect with the first pin shaft 11 and the second pin shaft 14. The toothed meshing surface 16 is located at the outermost end of the two toothed protrusions 15 and is an arc portion 19 concentrically arranged with the corresponding pin holes to improve the consistency when contacting with the outer teeth of the sprocket.

[0030] like Figure 5 As shown, the sprocket pressure angle is 31.5°, the sprocket pitch is 12.93mm, the sprocket modulus is 4.1157mm, and the sprocket displacement coefficient is -1.3422. At this time, the meshing noise is minimal.

[0031] like Figure 1 As shown, the sprocket includes a driving sprocket 2 mounted on the rear output shaft of the transfer case and a driven gear 3 mounted on the front output shaft of the transfer case. The driving sprocket 2 is provided with an axial hole, and one side of the driving sprocket is also provided with an integral external spline sleeve 21. The driven gear is provided with an internal spline hole 31 for connection with the spline shaft.

[0032] Specifically, when the driving sprocket 2, the chain 1, and the driven sprocket 3 rotate and transmit torque, the chain 1 meshes with the outer teeth of the sprocket through the distributed first chain plate 12 and the second chain plate 13. The first chain plate 12 and the second chain plate 13 are rotated at intervals so that the corresponding tooth meshing surface 16 can be attached to the outer teeth of the sprocket, so that the tooth meshing surface 16 and the outer teeth of the sprocket are smoothly attached. When the chain 1 meshes with multiple pairs of teeth of the sprocket, the tooth meshing surface 16 of the chain 1 and the tooth profile surface of the sprocket are effectively meshed, fully reflecting the load-bearing capacity of the sprocket and the chain 1; reducing the tensile stress of the chain plate of the chain 1, improving the reliability of the chain 1, and reducing the meshing noise of the sprocket and the chain 1.

[0033] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and the description only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will also have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents. It should be noted that in this article, if there are first and second relationship terms such as only used to distinguish one entity or operation from another entity or operation, it does not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or equipment. Without more constraints, an element defined by the phrase "comprising a..." does not exclude the existence of other identical elements in the process, method, article or apparatus comprising the element.

Claims

1. A transfer case sprocket chain structure, comprising sprockets installed on both sides of the transfer case and chains sleeved on the sprockets, the chains are meshed and connected with the outer teeth of the sprockets, and the characteristics are: The chain is composed of a plurality of groups of chain link units hingedly connected to form an annular chain, wherein the chain link units include a first pin shaft, a first chain plate group and a second chain plate group installed on the first pin shaft, a plurality of groups of first chain plates are arranged at intervals on the first chain plate group, a plurality of groups of second chain plates are arranged at intervals on the second chain plate group, the first chain plates and the second chain plates are staggered and serially connected on the first pin shaft, and a second pin shaft is further arranged on a side of the second chain plate away from the first chain plate to connect with another group of chain link units; The first chain plate is integrally provided with two toothed protrusions, and a toothed meshing surface that is fitted with the outer teeth of the sprocket is provided between the two toothed protrusions. The first chain plate and the second chain plate have the same structure. The second chain plate is located on one side of the toothed meshing surface of the first chain plate and does not contact the outer teeth of the sprocket. That is, for a circularly rotating chain, the toothed meshing surface of the first chain plate should protrude from the outer tooth surface of the adjacent joint to fully improve the effective meshing of the toothed meshing surface of the chain with the toothed surface of the sprocket, thereby improving the load-bearing capacity of the sprocket and the chain and reducing the tensile stress of the chain plate.

2. A transfer case sprocket chain structure according to claim 1, characterized in that: The outer ends of both sides of the first pin shaft and the second pin shaft are respectively provided with baffles, and the two ends of the first pin shaft and the second pin shaft are abutted against the outer ends of the baffles. The baffles protrude from the toothed meshing surface of the second chain plate to limit the chain and prevent the chain from separating from the outer teeth of the sprocket. The outer end of the baffle is consistent in shape with the outer end of the second chain plate, thereby improving the consistency of the outer end side of the chain.

3. The transfer case sprocket chain structure according to claim 1, characterized in that: Pin holes are respectively provided on both sides of the first chain plate to connect with the first pin shaft and the second pin shaft. The toothed meshing surface is located at the outermost end of the two toothed protrusions and is an arc portion concentrically arranged with the corresponding pin holes to improve the consistency when contacting with the outer teeth of the sprocket.

4. The transfer case sprocket chain structure according to claim 1, characterized in that: The sprocket pressure angle is 31.5°, the sprocket pitch is 12.93 mm, the sprocket modulus is 4.1157 mm, and the sprocket displacement coefficient is -1.3422, at which time the meshing noise is minimal.

5. The transfer case sprocket chain structure according to claim 1, characterized in that: The sprocket includes a driving sprocket mounted on the rear output shaft of the transfer case and a driven gear mounted on the front output shaft of the transfer case. The driving sprocket is provided with an axial hole, and one side of the driving sprocket is also provided with an integral external spline sleeve. The driven gear is provided with an internal spline hole to connect with the spline shaft.

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