TWI428522B - Gear transmission device - Google Patents

Description

Gear transmission

The invention relates to a gear transmission.

The gear teeth of the gear of the gear transmission mesh with each other. In order to ensure the normal lubrication of the gear teeth and avoid the jam caused by the rising working temperature, a certain amount of clearance is provided between the gears. When the light load, the torque changes greatly, accelerate or decelerate, the positive and negative working faces of the gear alternately change, and the gap between the gears will be too large to cause knocking, thereby increasing the impact force and noise between the gears.

A gear transmission includes a gearbox, a first gear disposed in the gearbox, a second gear meshing with the first gear, and a clearance adjustment mechanism. The gap adjusting device is for adjusting a gap between the first gear and the second gear. The gap adjusting mechanism includes a fixing bracket rotatably fixed to an inner wall of the gear box, a compression spring, and a carriage slidably mounted on the fixing bracket. The rotating shaft of the first gear passes through the carriage. The compression spring is disposed between the carriage and the fixed bracket. A sliding slot is formed on the fixing bracket. The carriage is provided with ribs that cooperate with the sliding slot. The rib slides along the sliding slot to slide the carriage in only one direction relative to the fixing bracket. The compression spring presses against the carriage, and the carriage slides toward the second gear to reduce the center distance between the first gear and the second gear, thereby achieving the purpose of reducing the gap between the first gear and the second gear.

However, if the gear transmission needs to adjust the gap between the first gear and the second gear, the gear box needs to be opened first, and then the compression amount of the spring is adjusted to adjust the first gear. A gap with the second gear. Therefore, the gear transmission described above is relatively cumbersome to adjust the clearance.

In view of the above, it is necessary to provide a gear transmission that can easily adjust the gear clearance.

A gear transmission device includes a gear box, a first gear housed in the gear box, a second gear meshing with the first gear, and a gap adjusting mechanism, wherein the gear box is provided with an adjusting screw hole, and the gap adjusting mechanism comprises a screw connection The first gear shaft is provided with a rotating shaft, and the rotating shaft is provided with a receiving hole on the end surface of the rotating shaft, and the positioning member is received at the bottom of the receiving hole, the first gear and the second The gear member is a bevel gear, and the two ends of the elastic member are respectively received in the receiving hole and the adjusting screw hole, and the elastic member is abutted between the locking member and the positioning member, and the elastic member is adjusted by the fastener on the outside of the gear box. The elastic variable, thereby adjusting the gap between the first gear and the second gear.

The gear transmission device can adjust the elastic variable of the elastic member by the fastener without opening the gear box, thereby adjusting the gap between the first gear and the second gear. Therefore, the gear transmission device is convenient to adjust the gear gap.

100‧‧‧Gear transmission

10‧‧‧ Gearbox

11‧‧‧ cabinet

12, 132‧‧‧ bearing

13‧‧‧ Cover

131‧‧‧Adjusting screw holes

20‧‧‧First gear

21‧‧‧ shaft

212, 211‧‧‧ receiving holes

213‧‧‧Positioning bulges

30‧‧‧second gear

31‧‧‧ shaft hole

40‧‧‧Adjustment agency

41‧‧‧ Positioning parts

42‧‧‧Flexible parts

43‧‧‧Locker

431‧‧‧Adjustment hole

50‧‧‧ Third gear

51‧‧‧Axis hole

53‧‧‧ positioning slot

60‧‧‧fourth gear

70‧‧‧ drive parts

71‧‧‧Drive shaft

80‧‧‧ Output shaft

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an exploded perspective view of a gear transmission of the present invention.

Figure 2 is an exploded perspective view of another perspective view of the gear transmission of Figure 1.

Figure 3 is a perspective view of the assembled gear transmission of Figure 1.

Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3.

The gear transmission of the present invention will be further detailed in conjunction with the drawings and embodiments. Description.

1 to 3, a gear transmission 100 according to a preferred embodiment of the present invention includes a gearbox 10, a first gear 20, a second gear 30, a gap adjustment mechanism 40, a third gear 50, a fourth gear 60, and a drive. 70 and output shaft 80. The first gear 20, the second gear 30, the gap adjusting mechanism 40, the third gear 50, and the fourth gear 60 are housed in the gear case 10. The output shaft 80 is rotatably threaded through the gearbox 10. The second gear 30 is fixedly coupled to the output shaft 80. The first gear 20 and the second gear 30 mesh with each other. The third gear 50 and the fourth gear 60 mesh with each other. The driving member 70 is fixed to the outer side wall of the gear case 10. The fourth gear 60 is pivotally connected to the driving member 70. The gap adjusting mechanism 40 is for adjusting a gap between the first gear 20 and the third gear 50.

The gear case 10 includes a case 11 and a cover 13 that closes the case 11. The driving member 70 is fixed to the cover body 13. The output shaft 80 is rotatably inserted through the casing 11. A bearing 12 is disposed on the casing 11. An adjustment screw hole 131 is defined in the cover 13 corresponding to the bearing 12. A bearing 132 is also provided on the inner side of the cover 13 (see Fig. 2). When the cover 13 is fixed to the case 11, the bearing 12 of the case 11 corresponds to the bearing 132 of the cover 13.

The first gear 20 is a bevel gear, and its shaft center is provided with a rotating shaft 21. The shaft 21 rotatably penetrates the bearing 12 of the gear case 10. A receiving hole 212 is defined in an end surface of the rotating shaft 21 adjacent to the large end of the first gear 20. The receiving hole 212 is a blind hole. A positioning protrusion 213 is disposed on a side of the rotating shaft 21 near the large end of the first gear 20.

The second gear 30 is a bevel gear that cooperates with the first gear 20, and a circular shaft hole 31 is opened in the middle portion. The maximum outer diameter of the second gear 30 is greater than the maximum outer diameter of the first gear 20.

The gap adjustment mechanism 40 includes a positioning member 41, an elastic member 42, and a lock 43. Positioning member 41 The elastic members 42 are sequentially received in the receiving holes 212 of the rotating shaft 21 of the first gear 20 . The lock member 43 is passed through the cover 13 of the gear case 10 and is abutted against the elastic member 42. Specifically, in the embodiment, the positioning member 41 is a positioning guide steel ball, the elastic member 42 is a cylindrical compression spring, and the locking member 43 is an adjusting screw received in the adjusting screw hole 131 of the cover body 13, and the elastic member 42 is sleeved. On the positioning member 41, an adjusting hole 431 is defined in the head of the locking member 43. The screwing position of the locking member 43 in the adjusting screw hole 131 of the gear box 10 can be adjusted by a tool such as a screwdriver (not shown).

The third gear 50 is provided with a circular shaft hole 51 and a positioning groove 53 at the edge of the shaft hole 51. The shaft 21 of the first gear 20 passes through the shaft hole 51. The positioning protrusion 213 cooperates with the positioning groove 53 to cause the third gear 50 to rotate the first gear 20.

Referring to FIG. 2, the drive member 70 is a motor including a drive shaft 71. The drive shaft 71 is threaded through the cover 13 of the gear case 10. The fourth gear 60 is non-rotatably sleeved on the drive shaft 71 of the driving member 70.

Referring to FIG. 1 , FIG. 2 and FIG. 4 simultaneously, when assembling the gear transmission device 100 , first, the output shaft 80 is bored through the casing 11 of the gear box 10 . Then, the second gear 30 is fixed to the output shaft 80. Next, the rotating shaft 21 of the first gear 20 is bored with the bearing 12 of the casing 11 of the gear case 10 while being engaged with the second gear 30. Then, the third gear 50 is sleeved on the rotating shaft 21 of the first gear 20, and the positioning protrusion 213 of the rotating shaft 21 of the first gear 20 is matched with the positioning groove 53 of the third gear 50, thereby making the first gear 20 rotates with the third gear 50. Then, the positioning member 41 and the elastic member 42 of the gap adjusting mechanism 40 are sequentially received in the receiving holes 211 of the rotating shaft 21 of the first gear 20. Then, the driving shaft 71 of the driving member 70 passes through the cover 13 of the gear box 10, and the driving member 70 is fixed to the outer wall of the cover 13 of the gear box 10. Next, the fourth gear 60 is non-rotatably sleeved on the drive shaft 71 of the driving member 70. Next, the case 11 of the gear box 10 and the cover 13 The fixed connection is made, and at the same time, the rotating shaft 21 of the first gear 20 is rotatably threaded through the bearing 132 of the cover 13 of the gear box 10. Finally, the lock 43 of the gap adjusting mechanism 40 is screwed to the adjusting screw hole 131 of the cover 13 of the gear case 10.

When the gap between the first gear 20 and the second gear 30 is adjusted, a tool such as a screwdriver is used to the outside of the gear box 10, and the elastic variable of the elastic member 42 is adjusted by the lock 43 of the gap adjusting mechanism 40, since the first gear 20 The second gear 30 is obliquely abutted by the bevel gear, so that the elastic variable of the elastic member 42 and the gap between the first gear 20 and the second gear 30 are in a linear relationship. Specifically, in the embodiment, the elastic member 42 can adjust the gap between the first gear 20 and the second gear 30 by 0.05 mm for every 1 mm of compression. Therefore, the gear transmission 100 of the present invention can adjust its gear gap more conveniently and accurately on its exterior.

It can be understood that the positioning member 41 of the gap adjusting mechanism 40 is not limited to the positioning guide ball, and may be other structures, for example, positioning protrusions formed at the bottom of the receiving hole 212 of the rotating shaft 21 of the first gear 20. The elastic member 42 is not limited to a cylindrical spring, and may be other structures such as a disc spring, a disk spring, or the like. The lock member 43 is not limited to the adjustment screw, and may be other structures, for example, a stud or the like that pierces the cover 13 of the gear case 10. The receiving hole of the first gear 20 can also be formed on the end surface of the rotating shaft 21 near one end of the small head of the first gear 20. At this time, the elastic member 42 of the side knee adjusting mechanism 40 is a tension spring.

100‧‧‧Gear transmission

11‧‧‧ cabinet

12‧‧‧ bearing

13‧‧‧ Cover

131‧‧‧Adjusting screw holes

20‧‧‧First gear

21‧‧‧ shaft

212‧‧‧ receiving hole

213‧‧‧Positioning bulges

30‧‧‧second gear

31‧‧‧ shaft hole

40‧‧‧Adjustment agency

41‧‧‧ Positioning parts

42‧‧‧Flexible parts

43‧‧‧Locker

431‧‧‧Adjustment hole

50‧‧‧ Third gear

51‧‧‧Axis hole

53‧‧‧ positioning slot

70‧‧‧ drive parts

80‧‧‧ Output shaft

Claims (8)

A gear transmission device includes a gear box, a first gear housed in the gear box, a second gear meshing with the first gear, and a gap adjusting mechanism, the gap adjusting mechanism including an elastic member, wherein the improvement is: The gear and the second gear member are bevel gears, and the gear box is provided with an adjusting screw hole. The gap adjusting mechanism further comprises a locking member and a positioning member screwed to the adjusting screw hole, wherein the first gear shaft is disposed a rotating shaft is disposed on the end surface of the rotating shaft adjacent to the locking member, the positioning member is received at the bottom of the receiving hole, the elastic member is a compression spring, and the two ends of the elastic member are respectively received in the receiving hole and the adjusting In the screw hole, the elastic member abuts against the locking member and the positioning member, and the elastic variable of the elastic member is adjusted by the locking member outside the gear box, thereby adjusting between the first gear and the second gear The gap. The gear transmission of claim 1, wherein the positioning member is a steel ball. The gear transmission device of claim 1, wherein the gear box comprises a box body and a cover body for closing the box body, the adjusting screw hole is formed on the cover body, and the lock body is adjusted for the head opening Hole adjustment screw. The gear transmission of claim 1, wherein the gear transmission further includes a third gear that is non-rotatably sleeved on the rotating shaft, and the third gear drives the first gear to rotate. The gear transmission of claim 4, wherein the gear transmission further includes a fourth gear that meshes with the third gear. The gear transmission of claim 5, wherein the gear transmission The moving device further includes a driving member pivotally connected to the fourth gear and fixed to an outer sidewall of the gear box. The gear transmission of claim 4, wherein the third gear is provided with a shaft hole at a middle portion and a positioning groove at an edge of the shaft hole, and the rotating shaft is disposed near a side of the large end of the first gear. Positioning the protrusion, the positioning protrusion is engaged with the positioning groove. The gear transmission of claim 1, wherein the gear transmission further comprises an output shaft fixedly coupled to the second gear.