CN114962555A - Idler shaft supporting structure - Google Patents

Abstract

The invention relates to an idler shaft supporting structure, and relates to the field of engineering machinery engines. . The invention satisfies the fixation and power transmission of the idler gear, and is a double-plate support structure, the shaft is not easily deformed after the gear is loaded, and the reliability of the gear and bearing parts is effectively improved.

Description

An idler shaft support structure

technical field

The invention relates to the field of construction machinery engines, in particular to a support structure for idler shafts in construction machinery engines.

Background technique

In the construction machinery engine, in addition to the flywheel for power output, there are other interfaces to transmit power. In order to meet the power transmission, the idler gear needs to exist between the crankshaft driving gear and the split power output gear. The idler gear is usually mounted on the idler shaft, which is fixed to the transfer case.

As shown in Figures 1 to 4, the idler shaft on the existing engine is unilaterally supported, that is, only the left side of the idler shaft is supported on the transfer case. The specific structure is: the idler shaft 6 is fixed on the transfer case 5 through 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 positioned by the boss of the idler shaft 6. Fix with idler gear shaft pressing plate 10 and bolts 9; idler gear 4 is mounted on double row tapered roller bearing 7.

In this structure, the idler shaft 6 is supported only on the left side, that is, the left cylindrical surface 21 of the idler shaft 6 is supported on the first light hole 15 of the transfer case 5 , and the three bolts 9 pass through the three thirds evenly distributed on the idler shaft 6 . The two light holes 16 fasten the idler shaft 6 in the threaded holes 20 on the transfer case.

Although this structure satisfies the fixation and power transmission of the idler gear, it is supported on one side and the shaft is a cantilever structure. After the gear is loaded, the shaft is prone to bending deformation, and the gear and bearing are inclined with the inclination, causing the gear and the bearing to bear the load. uniform, affecting the reliability of gear and bearing parts.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a double-sided supporting structure of the idler shaft, so that there are supporting points on both sides of the idler shaft in the structure, so as to improve the reliability of gears and bearing parts.

In order to achieve the above purpose, the technical solution of the present invention provides an idler shaft support structure, including a transfer case, the transfer case is provided with an idler shaft and a first end cover which is respectively supported and matched with both ends of the idler shaft and second end cap.

Preferably, both ends of the idler shaft are respectively provided with a first support point and a second support point, the first end cover is provided with a first light hole matched with the first support point, and the second end cover is provided with a first light hole matched with the first support point. A second light hole matched with the second support point is provided.

Preferably, the idler shaft is provided with a boss, and the second support point is set on the outer ring of the boss.

Preferably, the idler shaft sleeve is provided with a double-row tapered roller bearing, and the double-row tapered roller bearing is located between the first end cover and the boss.

Preferably, the outer ring of the boss is further provided with a convex ring at a position away from the first support point, and the convex ring abuts the surface of the second end cap away from the first end cap.

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 matched with the thread.

Preferably, the thread is located at a position where the first support point is far away from the second support point, and the threaded hole is located at a position where the first light hole is far away from the second light hole.

Preferably, the thread size is M47.5x2, and the threaded hole size is M48x2.

To sum up, the present invention includes the following beneficial technical effects:

The invention satisfies the fixing and power transmission functions of the idler gear, and is a double-plate support structure, so that the shaft is not easily deformed after the gear is loaded, and the reliability of the gear and bearing parts is effectively improved.

Description of drawings

Fig. 1 is the assembly drawing in the prior art;

Fig. 2 is the enlarged schematic diagram of A area in Fig. 1;

3 is a cross-sectional view of a transfer case in the prior art;

4 is a cross-sectional view of an idler shaft in the prior art;

Fig. 5 is the assembly drawing of the present invention;

Fig. 6 is the enlarged schematic diagram of B area in Fig. 5;

Fig. 7 is the sectional view of the transfer case of the present invention;

Fig. 8 is the enlarged schematic diagram of C area in Fig. 7;

9 is a cross-sectional view of an idler shaft in the present invention.

Reference numerals: 1, output gear; 2, output shaft; 3, driving gear; 4, idler gear; 5, transfer case; 6, idler shaft; 7, double row tapered roller bearing; 8, output gear shaft; 9. Bolt; 10. Idler gear shaft pressure plate; 11. The first support point; 12, The second support point; 13, The first end cover; 14, The second end cover; 15, The first light hole; 16, The second Light hole; 17, boss; 18, convex ring; 19, thread; 20, threaded hole; 21, cylindrical surface.

Detailed ways

The present invention will be further described in detail below with reference to Fig. 5 to Fig. 9 .

The embodiment of the present invention discloses an idler shaft supporting structure, which includes a transfer case 5, and the transfer case 5 is provided with an output shaft 2, a driving gear 3, an idler shaft 6 arranged between the output shaft 2 and the driving gear 3, and a sleeve. The output gear 1 is provided on the output shaft 2 , the double row tapered roller bearing 7 is mounted on the idler shaft 6 , and the idler gear 4 is sleeved on the double row tapered roller bearing 7 .

One end of the idler shaft 6 is provided with a first support point 11, the other end is integrally formed with a boss 17 on the outer circumference, and the outer ring of the boss 17 is provided with a second support point 12; The first end cover 13 and the second end cover 14 are connected; the first end cover 13 is provided with a first light hole 15 that is inserted and matched with the first support point 11 , and the second end cover 14 is provided with a second support point 12 The second optical hole 16 is inserted and matched. The boss 17 is further provided with a convex ring 18 at a position of the outer ring away from the first support point 11 , and the convex ring 18 abuts the surface of the second end cover 14 away from the first end cover 13 .

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

In addition, the end of the idler shaft 6 away from the boss 17 is also provided with a thread 19 . Threaded hole 20 that cooperates with thread 19.

The first support point 11 and the second support point 12 of the idler shaft 6 are respectively supported in the first light hole 15 and the second light hole 16 of the transfer case 5. The left side of the idler shaft 6 is M47.5x2 thread 19, the The thread 19 is matched with the M48x2 threaded hole 20 of the first end cap 13 . Usually, the threads 19 of the same specification are matched with each other, and the threads 19 of different specifications are used here to cooperate with each other, that is, the threaded hole 20 of M48x2 is matched with the shaft of M47.5x2, which ensures the tightening of the shaft and solves the problem of idleness. Axle 6 over-positioning problem.

The above are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore: all equivalent changes made according to the structure, shape and principle of the present application should be included in the protection scope of the present invention. Inside.

Claims (8)

1. An idler shaft support structure, characterized in that: it comprises a transfer case (5), and the transfer case (5) is provided with an idler shaft (6), which is respectively supported with both ends of the idler shaft (6). The mating first end cap (13) and second end cap (14). 2. An idler shaft support structure according to claim 1, characterized in that: the two ends of the idler shaft (6) are respectively provided with a first support point (11) and a second support point (12), the The first end cover (13) is provided with a first light hole (15) matched with the first support point (11), and the second end cover (14) is provided with the second support point (12) The matched second light hole (16). 3. An idler shaft support structure according to claim 2, characterized in that: the idler shaft (6) is provided with a boss (17), and the second support point (12) is provided on the boss (17) Outer ring. 4. An idler shaft support structure according to claim 3, characterized in that: the idler shaft (6) is sleeved with a double row tapered roller bearing (7), the double row tapered roller bearing (7) ) is located between the first end cover (13) and the boss (17). 5 . The idler shaft support structure according to claim 4 , wherein a convex ring ( 18 ) is further provided at the position of the outer ring of the boss ( 17 ) away from the first support point ( 11 ). 6 . The convex ring (18) abuts the surface of the second end cover (14) away from the first end cover (13). 6. An idler shaft support structure according to claim 4, characterized in that: the idler shaft (6) is further provided with a thread (19) at the end where the first support point (11) is located, and the The first end cover (13) is provided with a threaded hole (20) matched with the thread (19). 7. An idler shaft support structure according to claim 6, characterized in that: the thread (19) is located at a position where the first support point (11) is away from the second support point (12), and the The threaded hole (20) is located at a position where the first light hole (15) is away from the second light hole (16). 8 . The idler shaft support structure according to claim 7 , wherein the thread ( 19 ) has a specification of M47.5×2, and the threaded hole ( 20 ) has a specification of M48×2. 9 .

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