CN201412590Y - Large and medium worm wheel speed reduction box of electric valve actuator - Google Patents

Abstract

The utility model relates to a large and medium worm wheel speed reduction box of an electric valve actuator, which comprises a box body, a box cover, a worm wheel and a worm rod. The speed reductionbox is mainly characterized in that fixing sleeves are disposed between one lateral plane of the worm wheel and the box body, and between the other lateral plane of the worm wheel and the box cover, the fixing sleeves are respectively fixedly embedded inside the two lateral planes of the worm wheel, square grooves are distributed uniformly on the circumferences of the fixing sleeves, movable circular pins are mounted inside the square grooves, rolling sleeves are arranged respectively between one lateral shaft sleeve outer circular boss of the worm wheel and the box body, and between the otherlateral shaft sleeve outer circular boss of the worm wheel and an inner circular boss of the box cover, inner circular surfaces of the rolling sleeves are fixedly sleeved on the two lateral shaft sleeve outer circular bosses of the worm wheel, half-open circular grooves are uniformly distributed on the circumferences of the outer circular surfaces of the rolling sleeves, and rolling posts are movably installed inside the half-open circular grooves. The speed reduction box has the advantages of reducing transmission friction force produced between the worm wheel and the box body and between the worm wheel and the box cover, and having low transmission noise and high transmission efficiency and the like, and being adaptable to speed reducing devices of intelligent electric actuators.

Description

The big-and-middle-sized worm gear reducer of electric valve actuator

Technical field

The utility model relates to a kind of worm gear reducer, particularly the big-and-middle-sized worm gear reducer of using about a kind of electric valve actuator.The utility model is applicable to the big-and-middle-sized speed reducer of intelligent electric activator.

Background technique

Worm gear reducer generally is used in the speed reducer of various electric motor drive equipment, its structure generally comprises casing, case lid, worm gear, worm screw, the mutual gear engagement of worm gear and worm screw, the worm screw two ends are installed in the casing by tapered roller bearing respectively, the worm gear center fixation connects output shaft, and the worm gear mounting type is decided according to the size of use condition and model.For the matched direct-connected worm gear reducer that is connected with formula on the spot of electric valve actuator, its worm gear center hole directly is connected with valve hinges, and its central shaft can not adopt bearing structure to support, and can only directly be installed between casing and the case lid.For small-sized worm gear reducer, can between the outer round table surface of its worm gear both sides axle sleeve and casing, case lid, bearing be set, to reduce the gearing friction power between worm gear and casing, the case lid.But, for big-and-middle-sized worm gear reducer, because the diameter of worm gear both sides sleeve outer circle table top is too big, bearing can't be installed, so existing product all is between the outer round table surface of two side planes of worm gear and both sides axle sleeve and casing, case lid wear washer to be set respectively, to improve the wear-resisting property between worm gear and casing, the case lid.Its major defect is: when the worm drive worm gear rotates, there is bigger frictional force between the surface of contact of worm gear two side planes and casing, case lid, have bigger frictional force in worm gear axle sleeve both sides periphery and casing, the case lid between the round table surface, make the product operating noise big, efficient is low.

Summary of the invention

The purpose of this utility model is the shortcoming that exists at prior art, provides a kind of rotational noise low, the big-and-middle-sized worm gear reducer of the electric valve actuator of high working efficiency.

The technical solution of the utility model comprises casing, case lid, worm gear, worm screw, the mutual gear engagement of worm gear and worm screw, and the worm screw two ends are installed in the casing by tapered roller bearing respectively; Mainly be to be respectively equipped with setting sleeve between worm gear two side planes and casing, the case lid, described setting sleeve fixedly is inlaid in respectively in worm gear two side planes, the circumference square groove that evenly distributes, installation activity round pin in this square groove; Be respectively equipped with roll sleeve between the round table surface in worm gear both sides sleeve outer circle boss and casing, the case lid, the inner headed face of described roll sleeve is fixedly set on the sleeve outer circle platform convex of worm gear both sides, the periphery circumference HALF OPENING circular groove that evenly distributes, installation activity roller in the HALF OPENING circular groove.

In above technological scheme, the square groove on the setting sleeve is a dovetail groove, and round pin is the taper pin structure, and its nearly setting sleeve center of circle end is a small end, is big end away from setting sleeve center of circle end.

The utility model advantage compared with prior art be between worm gear two side planes and casing, case lid and both sides sleeve outer circle boss and casing, case lid between roll with roller by round pin respectively and contact, be equivalent between each surface of contact of worm gear and casing, case lid, be provided with a large special bearing, reduced the gearing friction power between worm gear and casing, the case lid, reduced rotational noise, improve transmission efficiency.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the plane structure schematic representation of setting sleeve among the utility model Fig. 1.

Fig. 3 is the plane structure schematic representation of roll sleeve among the utility model Fig. 1.

Embodiment

The big-and-middle-sized worm gear reducer of electric valve actuator as shown in Figure 1 comprises casing 1, case lid 2, worm gear 5, worm screw 10, worm gear 5 and worm screw 10 mutual gear engagement, and the two ends of worm screw 10 are installed in the casing 1 by tapered roller bearing respectively.Be respectively equipped with setting sleeve 3 between 5 liang of side planes of worm gear and casing 1, the case lid 2, described setting sleeve 3 fixedly is inlaid in respectively in 5 liang of side planes of worm gear, the circumferencial direction square groove that evenly distributes, as shown in Figure 2.The quantity of square groove determines that according to the size of worm gear 5 diameters worm gear 5 diameters are big more on the setting sleeve 3, on the setting sleeve 3 the quantity setting of square groove many more, worm gear 5 diameters are more little, the quantity setting of square groove is few more on the setting sleeve 3.Installation activity round pin 9 in the square groove on setting sleeve 3.This round pin 9 rolls with the inner plane of casing 1 and case lid 2 respectively and contacts, and distinguishes setting-in wear washer 8 at the inner plane of casing 1 that contacts with this round pin 9 and case lid 2.Be respectively equipped with roll sleeve 4 between the round table surface in worm gear 5 both sides sleeve outer circle boss and casing 1, the case lid 2, the inner headed face of described roll sleeve 4 is fixedly set on the worm gear 3 both sides sleeve outer circle boss, the periphery circumference of the roll sleeve 4 HALF OPENING circular groove that evenly distributes, as shown in Figure 3.Installation activity roller 6 in the HALF OPENING circular groove of roll sleeve 4, rolling between the round table surface in described roller 6 and casing 1, the case lid 2 contacts, and in casing 1 that contacts with roll sleeve 4 and case lid 2 fixing wear-resistant sleeve 7 on the round table surface.The quantity of roll sleeve 4 first opening circular grooves determines that according to the size of worm gear 5 diameters worm gear 5 diameters are big more, and the quantity of roll sleeve 4 first opening circular grooves is many more; Worm gear 5 diameters are more little, and the quantity of roll sleeve 4 first opening circular grooves is few more.

Square groove on the setting sleeve 3 is a trapezium structure, and round pin 9 is the taper pin structure, and it is a small end near setting sleeve 3 center of circle ends, is big end away from setting sleeve 3 center of circle ends.

Claims (2)

1, a kind of big-and-middle-sized worm gear reducer of electric valve actuator, comprise casing (1), case lid (2), worm gear (5), worm screw (10), worm gear (5) and the mutual gear engagement of worm screw (10), worm screw (10) two ends are installed in the casing (1) by tapered roller bearing respectively; It is characterized in that being respectively equipped with setting sleeve (3) between worm gear (5) two side planes and casing (1), the case lid (2), described setting sleeve (3) fixedly is inlaid in respectively in worm gear (5) two side planes, the circumference square groove that evenly distributes, installation activity round pin (9) in this square groove; Be respectively equipped with roll sleeve (4) between worm gear (5) both sides sleeve outer circle boss and casing (1), the interior round table surface of case lid (2), the inner headed face of described roll sleeve (4) is fixedly set on the sleeve outer circle boss of worm gear (5) both sides, the periphery circumference HALF OPENING circular groove that evenly distributes, installation activity roller (6) in the HALF OPENING circular groove.

2, the big-and-middle-sized worm gear reducer of electric valve actuator according to claim 1, it is characterized in that the square groove on the setting sleeve (3) is a dovetail groove, round pin (9) is the taper pin structure, and its nearly setting sleeve (3) center of circle end is a small end, and far orientation cover (3) center of circle end is big end.

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