CN201150020Y

CN201150020Y - Electric push rod

Info

Publication number: CN201150020Y
Application number: CNU2008200311674U
Authority: CN
Inventors: 李芬
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-24
Filing date: 2008-01-24
Publication date: 2008-11-12
Anticipated expiration: 2018-01-24

Abstract

The utility model relates to an electric pushing rod, which comprises a motor, a worm wheel worm rod decelerator, an inner casing pipe, a box body and a screw rod with a thread section and a nut, wherein, the motor is arranged at the outer side of the box body, and the output axle of the motor is connected with the worm wheel worm rod decelerator; the screw rod is also provided with a connection section and a bearing seat section, wherein, the bearing seat section presents a step shape, the diameter of the bearing seat section is less than the diameter of the connection section, the connection section of the screw rod is connected with the connection hole of a worm wheel, the nut nested on the screw rod is connected with one end of the inner casing pipe, and the other end of the inner casing pipe is connected with a front support; a bearing is arranged between the bearing seat section of the screw rod and the bearing seat at one end of the box body, a retaining ring connected on the screw rod and a hinged support connected at the end section of the box body are respectively pressed at one end of the inner and outer rings of the bearing, the other end of the inner and outer rings of the bearing is respectively connected with a shaft shoulder on the screw rod and the end face of the box body bearing seat, a supporting ring is installed between the thread section of the screw rod and the box body, a box cover is connected at the other end of the box body and is contacted with one end of the supporting ring. The electric pushing rod has the advantages that the carry capacity is high, and the noise is low.

Description

Electric pushrod

Technical field

The utility model relates to a kind of electric pushrod, belongs to the reciprocating push rod device of driven by power.

Background technology

The electric pushrod that is used for electric operator is mainly by motor, worm type of reduction gearing, screw mandrel, nut and shell constitute, motor is connected with screw mandrel by decelerator, be set with nut on the screw mandrel, nut is connected with threaded engagement on the screw mandrel, nut is connected with the rear end of inner sleeve, and worm type of reduction gearing is installed in the enclosure, thrust bearing and tension bearing are installed in the axle journal place of worm gear both sides respectively, and thrust bearing and tension bearing carry out axial location by the shell and the end cap of worm gear both sides respectively, after machine operation, by worm type of reduction gearing and two bearing supporting strap movable wire bar rotations, screw mandrel by the nut that is mated with the rotation motion motion that is in line, nut then drives inner sleeve and moves forward and backward, thereby the joint that is connected the inner sleeve front portion is also seesawed.After push rod arrived desired location, the sensitive switch action was closed motor.When bearing pulling force, then reach on the worm gear by tension bearing when the push rod retraction.Its shell of the electric pushrod of this kind structure is an overall structure, owing to be subjected to the restriction of mounting structure, the bearing specification that bears pulling force is less than the bearing specification of bearing thrust, therefore present disclosed electric pushrod all exists pulling force less than 1/3 thrust, because of the actual bearer pulling force descends, easily cause damage of bearings.On the other hand, because thrust bearing and tension bearing carry out axial location by worm gear and housing and end cap, it still is that bearing thrust all can act on worm gear that push rod bears pulling force, all adopt working of plastics for reducing the noise worm gear, so can produce distortion after the worm gear extruding, cause the worm and gear position of engagement to change, not only can influence transmission efficiency, and also can produce big noise.Moreover, the thrust bearing of this kind structure and tension bearing all are installed in the axle journal place of worm gear both sides, thrust bearing and thrust axis bear the accuracy of manufacture of worm gear and the influence of worm gear crimp, and the axiality of two bearings is difficult for guaranteeing, can produce bigger noise when also making push rod work.

Summary of the invention

The purpose of this utility model provides a kind of electronic thrust that can improve bearing capacity and reduce work noise.

Further purpose of the present utility model provides the strong electric pushrod of a kind of self-lock ability.

The utility model is that the technical scheme that achieves the above object is: a kind of electric pushrod, comprise motor, worm type of reduction gearing, inner sleeve, casing and have the screw mandrel and the nut of thread segment, it is characterized in that: described motor is installed in the outside portion of casing, and motor output shaft is connected with worm type of reduction gearing; Described screw mandrel also has linkage section and is step-like bearing pedestal section less than the linkage section diameter, and the linkage section of screw mandrel is connected with the connecting hole of worm gear, and the nut that is sleeved on the screw mandrel is connected with an end of inner sleeve, and the other end of inner sleeve is connected with preceding bearing; Between the bearing pedestal of the bearing pedestal section of screw mandrel and casing one end bearing is installed, the hinged-support that is connected the back-up ring on the screw mandrel and is connected the casing end is pressed in an end of bearing enclose respectively, the other end of bearing enclose respectively with screw mandrel on the shaft shoulder and the end face of housing bearing seat join, between the thread segment of screw mandrel and the casing support ring is installed, case lid is connected the other end of casing and joins with an end of support ring.

The utility model is that another technical scheme that achieves the above object is: the helical angle of described wire rod thread section≤6 °.

The utility model has the following advantages after adopting technique scheme:

1, rational in infrastructure, can improve bearing capacity.Bearing Installation of the present utility model is between the bearing pedestal section of the bearing pedestal of casing and screw mandrel, one end of bearing enclose is located by the shaft shoulder of bearing pedestal section one side and the end face of housing bearing seat respectively, the other end of bearing enclose is then by the back-up ring and the location of the hinged-support on the casing that are installed on the screw mandrel, therefore when worm screw drive screw mandrel moves back and forth, all reach on this bearing by casing and screw mandrel thrust and pulling force, make this bearing can bear the thrust and the pulling force of equivalent push rod.The utility model has improved the bearing capacity of electric pushrod owing to increased the pulling force of push rod, the motor power output under 75 watts, the dynamic load≤7000N of electric pushrod, static load≤10000N.

2, installing and locating is accurate, and noise is low.Casing of the present utility model and case lid are for dividing body structure, and bearing, support ring and worm gear are installed on the screw mandrel, bearing is to make axial location by casing, screw mandrel, hinged-support and back-up ring, and support ring carries out axial location by case lid, therefore can make the bearing, support ring and the worm gear that are installed on the screw mandrel on same-axial reference, guarantee the worm gear of rotation and be positioned at the bearing of worm gear two-side supporting on screw mandrel and the axiality of bracing ring, guarantee the accuracy of mesh of worm and wheel, reduce work noise.

3, transmission efficiency is stable.The utility model bears the thrust and the pulling force of screw mandrel by bearing, owing to improved the force-bearing situation of worm gear, the position of engagement of worm gear and worm screw can not change, and transmission efficiency is stable, and has also further reduced work noise.

4, the screw mandrel self-lock ability is strong.The utility model is controlled at the helical angle of wire rod thread section in 6 °, makes to have certain self-lock force between nut and the screw mandrel.

Description of drawings

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

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

Fig. 2 is the side-looking structural representation of Fig. 1.

Wherein: bearing before the 1-, 2-fairlead, 3-sensitive switch, 4-outer tube, the spacing muscle of 4-1-, 5-screw mandrel, 5-1-thread segment, 5-2-linkage section, 5-3-bearing pedestal section, 6-inner sleeve, 7-nut, 8-case lid, the 9-support ring, 10-casing, 11-worm screw, 12-worm gear, the 12-1-ring set, 12-2-supports muscle, 13-bearing, the 14-back-up ring, 15-motor, 16-hinged seat.

Embodiment

See shown in Fig. 1,2, electric pushrod of the present utility model comprises motor 15, worm type of reduction gearing, inner sleeve 6, casing 10 and has the screw mandrel 5 and the nut 7 of screw thread, motor 15 is installed in the outer end of casing 10, motor 15 output shafts are connected with worm type of reduction gearing, worm type of reduction gearing is made of with worm gear 12 worm screw 11 that is meshed, the output shaft of the utility model motor 15 can directly adopt worm screw 11, or the output shaft of motor 15 is connected with worm screw 11, and power is reached worm type of reduction gearing.See shown in Figure 1, screw mandrel 5 of the present utility model has thread segment 5-1, linkage section 5-2 and less than linkage section 5-2 diameter and be step-like bearing pedestal section 5-3, the linkage section 5-2 of screw mandrel 5 is connected in the connecting hole of worm gear 12, its periphery of linkage section 5-2 of this screw mandrel 5 is provided with axial straight-tooth, the connecting hole interference of worm gear 12 is crimped on the linkage section 5-2 of screw mandrel 5, and screw mandrel 5 is connected with worm gear 12.Its periphery of linkage section 5-2 of the utility model screw mandrel 5 also can be provided with helical teeth or annular knurl, and the connecting hole of worm gear 12 is bonded on the linkage section 5-2 of screw mandrel 5, and screw mandrel 5 is connected on the worm gear 12, and power is reached on the screw mandrel 5.See shown in Figure 1, the utility model has mechanical performance preferably for making worm gear 12, the length of worm gear 12 connecting holes is greater than the length of the worm gear field of conjugate action, and worm gear 12 sidepieces also are provided with reinforcement, this reinforcement can be illustrated in figure 1 as uniform support muscle 12-2 radially, or/and be provided with ring set 12-1 at the opposite side of worm gear 12.See shown in Figure 1, nut 7 is sleeved on the screw mandrel 5, rotatablely moving of screw mandrel 5 become nut 7 rectilinear motions, nut 7 is connected with an end of inner sleeve 6, these nut 7 one sides be provided with external screw thread, and the internal thread that inner sleeve 6 is provided with, inner sleeve 6 is screwed on the nut 7 and is spacing by the shaft shoulder on the nut 7, quickly and easily inner sleeve 6 is connected on the nut 7, the other end of inner sleeve 6 is connected with preceding bearing 1, drives inner sleeve 6 by nut 7 and does reciprocating linear motion.Between the bearing pedestal of the bearing pedestal section 5-3 of the utility model screw mandrel 5 and casing 10 1 ends bearing 13 is installed, the end face of casing 10 is connected with hinged-support 16, and be connected with back-up ring 14 on the screw mandrel 5, back-up ring 14 and hinged-support 16 are crimped on an end of bearing 13 Internal and external cycles respectively, and the other end of bearing 13 Internal and external cycles by respectively with screw mandrel 5 on the shaft shoulder and the end face of casing 10 bearing pedestals join spacing, this back-up ring 14 can adopt locking nut, screw mandrel 5 is provided with screw thread, by locking nut bearing 13 is carried out axial limiting.When nut 7 moves back and forth, by casing 10 and screw mandrel 5 thrust and pulling force are reached on this bearing 13, between the thread segment 5-1 of screw mandrel 5 and the casing 10 support ring 9 is installed, case lid 8 is connected on the casing 10, case lid 8 of the present utility model is provided with seam, one end of casing 10 is arranged on the stop portion of case lid 8, and an end of the end of case lid 8 and support ring 9 joins, and support ring 9 is carried out axial limiting.

See shown in Fig. 1,2, the utility model also has outer tube 4, outer tube 4 is installed on the case lid 8, one end of outer tube 4 withstands on the support ring 9, and the other end of outer tube 4 is equipped with fairlead 2, and 6 of inner sleeves are bearing in fairlead 2 endoporus places, and the inwall of outer tube 4 is provided with the spacing muscle 4-1 that prevents nut 7 rotations, to guarantee nut 7 rectilinear motions, the sensitive switch 3 of control screw mandrel stroke also is installed in the outer tube 4 and connects lead, keep the electric pushrod outward appearance clean and tidy.

During the utility model work, motor 15 drives worm gear reducer and rotates, and 5 of screw mandrels that are connected on the worm gear 12 rotate, and are enclosed within nut 7 moving linearlies of screw mandrel 5, nut 7 drives inner sleeve 6 and does straight reciprocating motion, realizes the reciprocating sliding campaign of push rod.

Claims

1, a kind of electric pushrod, comprise motor (15), worm type of reduction gearing, inner sleeve (6), casing (10) and have screw mandrel (5) and the nut (7) of thread segment (5-1), it is characterized in that: described motor (15) is installed in the outside of casing (10), and the output shaft of motor (15) is connected with worm type of reduction gearing; Described screw mandrel (5) also has linkage section (5-2) and is step-like bearing pedestal section (5-3) less than linkage section (5-2) diameter, the linkage section (5-2) of screw mandrel (5) is connected with the connecting hole of worm gear (12), the nut (7) that is sleeved on the screw mandrel (5) is connected with an end of inner sleeve (6), and the other end of inner sleeve (6) is connected with preceding bearing (1); Between the bearing pedestal section (5-3) of screw mandrel (5) and the bearing pedestal of casing (10) one ends bearing (13) is installed, the hinged-support (16) that is connected the back-up ring (14) on the screw mandrel (5) and is connected casing (10) end is pressed in an end of bearing (13) Internal and external cycle respectively, the other end of bearing (13) Internal and external cycle respectively with screw mandrel (5) on the shaft shoulder and the end face of casing (10) bearing pedestal join, between the thread segment (5-1) of screw mandrel (5) and the casing (10) support ring (9) is installed, case lid (8) is connected the other end of casing (10) and joins with an end of support ring (9).

2, electric pushrod according to claim 1 is characterized in that: helical angle≤6 of described screw mandrel (5) thread segment °.

3, electric pushrod according to claim 1 is characterized in that: the periphery of the linkage section (5-2) of described screw mandrel (5) is provided with axial straight-tooth, and the connecting hole interference of worm gear (12) is crimped on the linkage section (5-2) of screw mandrel (5).

4, electric pushrod according to claim 1 is characterized in that: linkage section (5-2) periphery of described screw mandrel (5) is provided with helical teeth or annular knurl, and the connecting hole of worm gear (12) is bonded on the linkage section (5-2) of screw mandrel (5).

5, according to one of claim 1 or 3 or 4 described electric pushrod, it is characterized in that: the length of described worm gear (12) connecting hole is greater than the length of the worm gear field of conjugate action, and the sidepiece of worm gear (12) also is provided with support muscle (12-2) or/and ring set (12-1).

6, electric pushrod according to claim 1 is characterized in that: a side of described nut (7) is provided with external screw thread, and it is last and spacing by the shaft shoulder on the nut (7) that the internal thread that inner sleeve (6) is provided with, inner sleeve (6) are screwed in nut (7).

7, electric pushrod according to claim 1, it is characterized in that: also have outer tube (4), outer tube (4) is installed on the case lid (8), one end of outer tube (4) withstands on the support ring (9), the other end of outer tube (4) is equipped with fairlead (2), inner sleeve (6) is bearing in fairlead (2) endoporus place, and the inwall of outer tube (4) is provided with the spacing muscle (4-1) that prevents nut (7) rotation.

8, electric pushrod according to claim 7 is characterized in that: the sensitive switch (3) of control screw mandrel stroke is installed in the described outer tube (4) and connects lead.