Idler shaft support structure

Abstract

The present application relates to a kind of idler shaft support structure, it relates to the field of engineering machinery engine, it includes transfer case, transfer case is equipped with idler shaft, first end cover and second end cover are respectively supported with the both ends of idler shaft cooperation.The present application satisfies the fixing of idler gear and power transmission, and it is double-plate support structure, gear is not easy to produce bending deformation after being loaded, effectively improve the reliability of gear and bearing parts.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery engines, and in particular to a support structure for an idler shaft in an engineering machinery engine. Background Technology

[0002] In construction machinery engines, besides the flywheel providing power output, other interfaces transmit power. To meet power transmission requirements, an idler gear must exist between the crankshaft drive gear and the power output gear. The idler gear is typically mounted on an idler shaft, which is fixed to the transfer case.

[0003] As attached Figure 1 To be continued Figure 4 As shown, the idler shaft on the existing engine is supported on only one side, that is, the idler shaft is supported on the transfer case only on the left side. The specific structure is as follows: the idler shaft 6 is fixed to the transfer case 5 by three evenly distributed bolts 9; the double-row tapered roller bearing 7 is mounted on the idler shaft 6, the left side is positioned by the boss of the idler shaft 6, and the right side is fixed by the idler gear shaft pressure plate 10 and bolts 9; the idler gear 4 is mounted on the double-row tapered roller bearing 7.

[0004] In this structure, the idler shaft 6 is supported only on the left side, that is, the cylindrical surface 21 on the left side of the idler shaft 6 is supported on the first optical hole 15 of the transfer case 5, and the three bolts 9 fasten the idler shaft 6 to the threaded hole 20 on the transfer case through the three evenly distributed second optical holes 16 on the idler shaft 6.

[0005] Although this structure satisfies the requirements of fixing the idler gear and transmitting power, it has the following drawbacks: 1. Single-sided support and cantilever structure of shaft. When the gear is under load, the shaft is prone to bending deformation. The gear and bearing tilt accordingly, resulting in uneven load on the gear and shaft support, which affects the reliability of the gear and bearing parts. Summary of the Invention

[0006] The purpose of this invention is to provide a structure with double-sided support for the idler shaft, so that there are support points on both sides of the idler shaft in the structure, thereby improving the reliability of gear and bearing components.

[0007] To achieve the above objectives, the present invention provides an idler shaft support structure, including a transfer case, wherein the transfer case is provided with an idler shaft, a first end cover and a second end cover that are respectively supported and cooperated with both ends of the idler shaft.

[0008] Preferably, the idler shaft has a first support point and a second support point at both ends, the first end cover has a first light hole that mates with the first support point, and the second end cover has a second light hole that mates with the second support point.

[0009] Preferably, the idler shaft is provided with a boss, and the second support point is located on the outer ring of the boss.

[0010] Preferably, the idler wheel shaft is fitted with a double-row tapered roller bearing, which is located between the first end cover and the boss.

[0011] Preferably, the outer ring of the boss is further provided at a position away from the first support point, and the protruding ring abuts against the surface of the second end cover away from the first end cover.

[0012] Preferably, the idler shaft is further provided with a thread at the end where the first support point is located, and the first end cover is provided with a threaded hole that mates with the thread.

[0013] Preferably, the thread is located at the first support point away from the second support point, and the threaded hole is located at the first aperture away from the second aperture.

[0014] Preferably, the thread specification is M47.5x2 and the thread hole specification is M48x2.

[0015] In summary, the present invention has the following beneficial technical effects:

[0016] This invention satisfies the functions of fixing and power transmission of idler gears, and features a double-plate support structure. Under load, the shaft is less prone to bending deformation, effectively improving the reliability of gears and bearing components. Attached Figure Description

[0017] Figure 1 It is an assembly drawing in the prior art;

[0018] Figure 2 yes Figure 1 Enlarged diagram of area A in the middle;

[0019] Figure 3 This is a cross-sectional view of a transfer case in the prior art;

[0020] Figure 4 This is a cross-sectional view of an idler shaft in the prior art;

[0021] Figure 5 This is an assembly drawing of the present invention;

[0022] Figure 6 yes Figure 5 Enlarged diagram of area B in the middle;

[0023] Figure 7 This is a cross-sectional view of the transfer case of the present invention;

[0024] Figure 8 yes Figure 7 Enlarged diagram of area C;

[0025] Figure 9 This is a cross-sectional view of the idler shaft in this invention.

[0026] Reference numerals: 1. Output gear; 2. Output shaft; 3. Drive gear; 4. Idler gear; 5. Transfer case; 6. Idler shaft; 7. Double row tapered roller bearing; 8. Output gear shaft; 9. Bolt; 10. Idler shaft pressure plate; 11. First support point; 12. Second support point; 13. First end cover; 14. Second end cover; 15. First aperture; 16. Second aperture; 17. Boss; 18. Breast ring; 19. Thread; 20. Threaded hole; 21. Cylindrical surface. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 5 To be continued Figure 9 The present invention will be described in further detail below.

[0028] This invention discloses an idler shaft support structure, including a transfer case 5, an output shaft 2, a drive gear 3, an idler shaft 6 located between the output shaft 2 and the drive gear 3, an output gear 1 sleeved on the output shaft 2, a double-row tapered roller bearing 7 mounted on the idler shaft 6, and an idler gear 4 sleeved on the double-row tapered roller bearing 7.

[0029] One end of the idler shaft 6 is provided with a first support point 11, and the outer circumference of the other end is integrally formed with a boss 17, and the outer circumference of the boss 17 is provided with a second support point 12. The transfer case 5 is provided with a first end cover 13 and a second end cover 14 respectively connected to the two ends of the idler shaft 6. The first end cover 13 is provided with a first light hole 15 that is inserted and engaged with the first support point 11, and the second end cover 14 is provided with a second light hole 16 that is inserted and engaged with the second support point 12. The boss 17 is also provided with a raised ring 18 at a position on its outer circumference away from the first support point 11, and the raised ring 18 abuts against the surface of the second end cover 14 away from the first end cover 13.

[0030] The first end cover 13 and the second end cover 14 are located on both sides of the double-row tapered roller bearing 7 along the axial direction of the idler shaft 6. The left side of the double-row tapered roller bearing 7 is positioned by the first end cover 13 of the transfer case 5, and the right side is positioned by the boss 17 of the idler shaft 6. The idler gear 4 is mounted on the double-row tapered roller bearing 7. Power is transmitted from the driving gear 3 through the idler gear 4 to the output gear 1, and finally output by the output shaft 2.

[0031] In addition, the end of the idler shaft 6 away from the boss 17 is provided with a thread 19. The thread 19 is located on the side of the first support point 11 away from the second support point 12. The first end cover 13 is also provided with a threaded hole 20 that mates with the thread 19 inside the first light hole 15.

[0032] The first support point 11 and the second support point 12 of the idler shaft 6 are respectively supported in the first aperture 15 and the second aperture 16 of the transfer case 5. The left side of the idler shaft 6 has an M47.5x2 thread 19, which mates with the M48x2 threaded hole 20 of the first end cover 13. Normally, threads 19 of the same specification mate with each other, but here different specifications of threads 19 are used to mate with each other, that is, the M48x2 threaded hole 20 mates with the M47.5x2 shaft, which ensures the tightness of the shaft and solves the problem of over-positioning of the idler shaft 6.

[0033] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of the present invention.

Claims

1. An idler wheel shaft support structure, characterized in that: The device includes a transfer case (5), which has an idler shaft (6), a first end cap (13) and a second end cap (14) that are respectively supported and engaged with both ends of the idler shaft (6); the idler shaft (6) has a first support point (11) and a second support point (12) at both ends; the first end cap (13) has a first aperture (15) that engages with the first support point (11); the second end cap (14) has a second aperture (16) that engages with the second support point (12); the idler shaft (6) also has a thread (19) at the end where the first support point (11) is located; the first end cap (13) has a threaded hole (20) that engages with the thread (19); the threaded holes (20) of different specifications engage with the thread (19) to ensure the tightness of the shaft and avoid over-positioning of the idler shaft.

2. The idler shaft support structure according to claim 1, characterized in that: The idler shaft (6) is provided with a boss (17), and the second support point (12) is located on the outer ring of the boss (17).

3. The idler shaft support structure according to claim 2, characterized in that: The idler shaft (6) is fitted with a double-row tapered roller bearing (7), which is located between the first end cover (13) and the boss (17).

4. The idler shaft support structure according to claim 3, characterized in that: The outer ring of the boss (17) is provided with a protruding ring (18) at a position away from the first support point (11), and the protruding ring (18) abuts against the surface of the second end cap (14) away from the first end cap (13).

5. The idler shaft support structure according to claim 3, characterized in that: The thread (19) is located at the first support point (11) away from the second support point (12), and the threaded hole (20) is located at the first aperture (15) away from the second aperture (16).

6. The idler shaft support structure according to claim 5, characterized in that: The thread (19) is M47.5x2 and the threaded hole (20) is M48x2.

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