CN210859987U - Novel bevel gear box for valve - Google Patents

Abstract

The utility model relates to a novel bevel gear box for valves, which comprises a box body, a box cover, a driving gear and a driven gear, wherein the driven gear and the driving gear adopt bevel gear intermeshing transmission; the method is characterized in that: the thrust bearing is a bidirectional thrust device formed by installing an outer thrust ring and an inner thrust ring between an output shaft and a box body. The thrust bearing is adopted between the output shaft and the box body to bear axial limiting thrust in the upper direction and the lower direction, and the thrust bearing has the advantages of small volume, low cost, high output torque and efficiency and the like.

Description

Novel bevel gear box for valve

Technical Field

The utility model relates to a transmission head specifically is about a bevel gear case. The utility model is suitable for a valve actuator's gear box.

Background

The valve actuator consists of a motor and a gear box, and the gear box drives the valve to open and close after reducing the output torque of the motor. The bevel gear box is used more on the valve actuator and structurally comprises a box body, a box cover, a driving gear and a driven gear, wherein the box cover is fixedly arranged at the upper end of the box body, a driving gear shaft is fixedly connected with a driving device and is arranged on the inner side of the box cover through a bearing, the driven gear and the driving gear are in bevel gear intermeshing transmission, an output shaft is fixedly arranged at the center of the driven gear, a pressure bearing is arranged between the driven gear and the upper end face of the box body, a thrust bearing is arranged between the outer circular face of the output shaft and a box body mounting hole, and axial limiting thrust in. One of the disadvantages is: the output shaft transmission valve generates axial thrust in the upper and lower directions when being opened and closed, two thrust bearings are arranged between the output shaft and the box body to respectively bear the axial thrust in the upper and lower directions in the conventional product, the box body needs larger structural size, and the product has large volume and high manufacturing cost; the second defect is that: a pressure bearing between a driven gear and the upper end face of a box body of an existing product is arranged at a position close to the outer circular face of an output shaft and far away from a gear transmission stress point, and axial torque generated on the pressure bearing in a transmission process is large, so that the pressure bearing generates large abrasion and transmission noise, and the output torque and the transmission efficiency are reduced.

Disclosure of Invention

The utility model discloses shortcoming to prior art exists provides a small, with low costs, transmission noise is low, output torque is big, the novel bevel gear box for valve that transmission efficiency is high.

The technical scheme of the utility model comprises a box body, a box cover, a driving gear and a driven gear, wherein the box cover is fixedly arranged at the upper end of the box body, a transmission shaft of the driving gear is fixedly connected with a driving device and is arranged on the box cover by a bearing, the driven gear and the driving gear adopt bevel gear intermeshing transmission, an output shaft is arranged at the center of the driven gear, and a thrust bearing is arranged between the outer circular surface of the output shaft and a box body mounting hole; the method is characterized in that: the thrust bearing is a bidirectional thrust device formed by installing an outer thrust ring and an inner thrust ring between an output shaft and a box body, the outer circular surface of the outer thrust ring is fixedly installed on the wall of an inner cavity of the box body, the inner hole wall of the inner thrust ring is fixedly installed on the outer circular surface of the output shaft, the inner hole of the outer thrust ring is in movable fit with the outer circular surface of the inner thrust ring, the lower ring surface of the thrust bearing is installed on the upper end surfaces of the outer thrust ring and the inner thrust ring, and the upper ring surface of the thrust bearing is installed between the radial inner step of the wall of.

In the technical scheme, steel balls are uniformly arranged between the lower end surface of the radial outer side of the driven gear and the upper end surface of the box body in the circumferential direction, the upper parts of the steel balls are embedded in semicircular holes in the lower end surface of the driven gear, the lower parts of the steel balls are embedded in semicircular holes in the upper end surface of the box body, and the steel balls are located right below a transmission stress point of the driving gear and the transmission gear.

In the technical scheme, wear-resistant materials are sprayed on the surfaces of the steel balls and semi-circular holes in the driven gear and the box body.

In above technical scheme, set up striking drive mechanism between driven gear and the output shaft, striking drive mechanism adopts and sets up the driving disk between the radial and driven gear of output shaft and constitutes, driving disk hole fixed mounting is at the outer disc of output shaft, driven gear inner bore suit is at the outer disc of driving disk, the outer disc circumferencial direction of driving disk evenly sets up the radial circular arc convex shoulder of a plurality of, driven gear hole circumferencial direction evenly sets up the radial circular arc recess with radial circular arc convex shoulder the same quantity, radial circular arc convex shoulder activity inlays the dress in radial circular arc recess, the radian of radial circular arc recess is greater than the radian of radial circular arc convex shoulder, drive arrangement adopts the hand wheel.

Compared with the prior art, the utility model has the advantages that the bidirectional thrust bearing device is arranged between the output shaft and the box body, so that the axial limiting thrust in the upper direction and the lower direction can be borne by adopting a thrust bearing between the output shaft and the box body, the product volume is reduced, and the manufacturing cost is reduced; in addition, steel balls are uniformly arranged between the lower end face of the radial outer side of the driven gear and the upper end face of the box body in the circumferential direction, the steel balls form a pressure bearing right below a transmission stress point of the driving gear and the transmission gear, the axial torque of the pressure bearing is small in the transmission process, the transmission abrasion of the pressure bearing is reduced, the transmission noise is reduced, and the output torque and the transmission efficiency are improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the striking mechanism of fig. 1 according to the present invention.

Detailed Description

The novel bevel gear box for the valve as shown in fig. 1 comprises a box body 1, a box cover 2, a driving gear 3 and a driven gear 4, wherein the box cover 2 is fixedly arranged at the upper end of the box body 1, a transmission shaft 6 of the driving gear 3 is connected with a driving device and is arranged on the box cover 2 through a bearing 5, the driven gear 4 and the driving gear 3 are in mutual meshing transmission through bevel gears, an output shaft 11 is arranged at the center of the driven gear 4, the output shaft 11 is in threaded transmission connection or axial flat key fixed connection with a valve rod of the valve, a thrust bearing 8 is arranged between the outer circular surface of the output shaft 11 and a mounting hole of the box body 1, the thrust bearing 8 bears the axial limiting thrust in the upper direction and the lower direction in the lifting or rotating process of the transmission valve rod of the output shaft 11, the upper axial limiting of the; the method is characterized in that: the thrust bearing 8 is installed between the output shaft 11 and the box body 1 by the outer thrust ring 9 and the inner thrust ring 10 to form a bidirectional thrust device, the excircle surface of the outer thrust ring 9 is fixedly installed on the inner cavity wall of the box body 1, the inner hole wall of the inner thrust ring 10 is fixedly installed on the excircle surface of the output shaft 11, the inner hole wall of the outer thrust ring 9 is in movable fit with the excircle surface of the inner thrust ring 10, a shaft sleeve and rotating shaft matching structure is formed between the outer thrust ring 9 and the inner thrust ring 10, the radial friction force of the rotation of the output shaft 11 is reduced, the lower ring surface of the thrust bearing 8 is installed on the upper end surfaces of the outer thrust ring 9 and the inner thrust ring 10, and the upper ring surface of the thrust bearing 8 is. When the output shaft 11 drives the valve rod to descend, the thrust bearing 8 bears upward axial thrust between the inner thrust ring 10 and the radial inner step 13 of the inner cavity wall of the box body 1, and the radial inner step 13 of the inner cavity wall of the box body 1 realizes axial limit on the output shaft 11; when the output shaft 11 drives the valve rod to ascend, the thrust bearing 8 bears downward axial thrust between the outer thrust ring 9 and the radial shoulder 12 of the output shaft 11, and the outer thrust ring 9 axially limits the output shaft 11. Similarly, when the output shaft 11 drives the valve rod to rotate, the radial inner step 13 and the outer thrust ring 9 of the inner cavity wall of the box body 1 respectively limit the output shaft 11 up and down. The thrust bearing bears the bidirectional axial limiting thrust, the problem that the two thrust bearings bear the axial limiting thrust in two directions respectively in the existing product is solved, and compared with the prior art, the product size is reduced, and the manufacturing cost is reduced.

The steel balls 7 are uniformly arranged between the lower end face of the radial outer side of the driven gear 4 and the upper end face of the box body 1 in the circumferential direction, the upper portions of the steel balls 7 are embedded in semicircular holes in the lower end face of the driven gear 4, the lower portions of the steel balls 7 are embedded in semicircular holes in the upper end face of the box body 1, the steel balls 7 form a pressure bearing between the driven gear 4 and the box body 1, the pressure bearing is located below a transmission stress point of the driving gear 3 and the driven gear 4, axial torque generated to the pressure bearing in the transmission process is small, transmission abrasion and transmission noise of the pressure bearing are reduced, and output torque and transmission efficiency are improved.

And wear-resistant materials are sprayed on the surfaces of the steel balls 7 and semi-circular holes in the driven gear 4 and the box body 1, so that the wear resistance is improved.

An impact transmission mechanism is arranged between the driven gear 4 and the output shaft 11, the impact transmission mechanism is formed by arranging a transmission disc 14 between the radial direction of the output shaft 11 and the driven gear 4, the inner hole of the transmission disc 14 is fixedly arranged on the outer circular surface of the output shaft 11, the inner hole of the driven gear 4 is sleeved on the outer circular surface of the transmission disc 14, a plurality of radial circular arc convex shoulders 15 are uniformly arranged in the circumferential direction of the outer circular surface of the transmission disc 14, the radial circular arc grooves 16 with the same number as the radial circular arc convex shoulders 15 are uniformly arranged in the circumferential direction of the inner hole of the driven gear 4, the radial circular arc convex shoulders 15 are movably embedded in the radial circular arc grooves 16, the circular arc radian of the radial circular arc grooves 16 is larger than that of the radial circular arc convex shoulders 15, the driving device adopts a hand wheel, before the valve is opened, the, the valve is opened by impact force, particularly for a wedge-shaped gate valve and a stop valve, the wedging force in a closed state is very large, the opening torque is very large, and the valve is easily opened by impacting a transmission mechanism by a hand wheel, as shown in fig. 2.

Claims (4)

1. A novel bevel gear box for a valve comprises a box body (1), a box cover (2), a driving gear (3) and a driven gear (4), wherein the box cover (2) is fixedly arranged at the upper end of the box body (1), a transmission shaft (6) of the driving gear (3) is connected with a driving device and is arranged on the box cover (2) through a bearing (5), the driven gear (4) and the driving gear (3) are in mutual meshing transmission through bevel gears, an output shaft (11) is arranged at the center of the driven gear (4), and a thrust bearing (8) is arranged between the outer circular surface of the output shaft (11) and a mounting hole of the box body (1); the method is characterized in that: the thrust bearing (8) is installed between the output shaft (11) and the box body (1) by an outer thrust ring (9) and an inner thrust ring (10) to form a bidirectional thrust device, the outer circular surface of the outer thrust ring (9) is fixedly installed on the inner cavity wall of the box body (1), the inner hole wall of the inner thrust ring (10) is fixedly installed on the outer circular surface of the output shaft (11), the inner hole wall of the outer thrust ring (9) is in movable fit with the outer circular surface of the inner thrust ring (10), the lower circular surface of the thrust bearing (8) is installed on the upper end surfaces of the outer thrust ring (9) and the inner thrust ring (10), and the upper circular surface of the thrust bearing (8) is installed between the radial inner step (13) of the inner cavity wall of the box body (1) and the lower end surface of the.

2. The bevel gear box for a valve according to claim 1, wherein: steel balls (7) are uniformly arranged between the lower end face of the radial outer side of the driven gear (4) and the upper end face of the box body (1) in the circumferential direction, the upper portions of the steel balls (7) are embedded in semicircular holes in the lower end face of the driven gear (4), and the lower portions of the steel balls (7) are embedded in semicircular holes in the upper end face of the box body (1).

3. The bevel gear box for a valve according to claim 2, wherein: and wear-resistant materials are sprayed on the surfaces of the steel balls (7) and semi-circular holes in the driven gear (4) and the box body (1).

4. The bevel gear box for a valve according to claim 1, 2 or 3, wherein: set up striking drive mechanism between driven gear (4) and output shaft (11), striking drive mechanism adopts and sets up drive plate (14) and constitutes between output shaft (11) is radial and driven gear (4), drive plate (14) hole fixed mounting is in output shaft (11) outer disc, and driven gear (4) hole suit is at drive plate (14) outer disc, and drive plate (14) outer disc circumferencial direction evenly sets up a plurality of radial circular arc convex shoulder (15), driven gear (4) hole circumferencial direction evenly set up with radial circular arc convex shoulder (15) the same quantity radial circular arc recess (16), radial circular arc convex shoulder (15) activity inlays the dress in radial circular arc recess (16), and the circular arc radian of radial circular arc recess (16) is greater than the circular arc radian of radial circular arc convex shoulder (15), and drive arrangement adopts the hand wheel.

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