CN201224676Y - Electric jack screw - Google Patents

Abstract

The utility model discloses an electric screw jack, belonging to a technical field of lifting tool, which comprises a driving device, a helical lifting device driven by the driving device, an electromotor, and a lifting device chassis; the helical lifting device comprises a chassis bearing disc on the lifting device chassis, a screw rod bearing disc which can rotate relative to the shaft center of the chassis bearing disc, and a helical lifting mechanism connected with the screw rod bearing disc. A first annular guide rail is arranged between the chassis bearing disc and the screw rod bearing disc, a bearing steel ball is arranged in the guide rail; a second annular guide rail is arranged between the outer flange of the screw rod bearing disc and the housing of the lifting device chassis, a stabilizing steel ball is arranged in the guide rail. The helical lifting mechanism comprises a driving screw rod integrated with the screw rod bearing disc, a lifting screw sleeve group, a rotation-stop sleeve group outside the lifting screw sleeve group, an ejection cap and a travel switch. The utility model is provided with the bearing steel balls and the stabilizing steel balls, so as to ensure operational stability. A reducer with small tooth differences is adopted in the driving device, therefore the electric screw jack has compact structure and large transmission ratio, and is suitable for maintenance work of truck..

Description

A kind of electric screw-jacks

Technical field

The utility model relates to a kind of lifting implement, relates in particular to a kind of electric screw-jacks, is applicable to the operation of rising of vehicle maintenance and repair.

Background technology

At present the jack of autotruck maintenance usefulness is normally realized the lifting of jack with hand moving operating handle, very effort is very tired.At the problems referred to above, the someone has made good try, is that 03254400.6 Chinese utility model patent discloses " a kind of Vehicular electric jack " as the patent No., and it is characterized in that: it comprises electrical motor, jacking mechanism, base; Jacking mechanism is by forming with the middle screw rod cover of externally threaded center bolt, band internal and external screw thread, tapped outer screw rod cover; Middle swivel nut is enclosed within on the center bolt, and on the swivel nut, the internal and external screw thread between each spiral was meshing with each other in the middle of outer swivel nut was enclosed within; Electrical motor drives center bolt by speed reduction gearing, and speed reduction gearing is arranged on the base.But this patent only is fit to the dolly maintenance to be used, and is not suitable for the maintenance activity of autotruck.

Summary of the invention

Technical problem to be solved in the utility model is the present situation at prior art, provide a kind of modern design rationally, the electric screw-jacks of compact conformation, working stability.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of electric screw-jacks, comprise driving device and the spiral device of rising that drives by driving device, and with driving device bonded assembly electrical motor, rise the device support; The spiral device of rising comprises the support bearing disc of rising on the device support, and the screw rod bearing disc of the axle center of support bearing disc rotation relatively is with screw rod bearing disc bonded assembly spiral rising mechanism; Cooperate between support bearing disc and the screw rod bearing disc and form first ring-shaped guide rail, be provided with the pressure-bearing steel ball in this first ring-shaped guide rail, the outer of screw rod bearing disc forms second ring-shaped guide rail with rising to cooperate between the device support shell, is provided with in this second ring-shaped guide rail and protects steady steel ball.

The further technical measures of optimizing the technical program also comprise:

Above-mentioned spiral rising mechanism comprises the drive screw that is connected as a single entity with the screw rod bearing disc, promote the swivel nut group, be arranged on and promote the swivel nut group and limit its outermost layer outward and promote the spline sleeve group that swivel nut rotates, be fixedly connected on and promote the top cap on the swivel nut group and be arranged on travel switch on the spline sleeve group; Promote the swivel nut group and promote swivel nuts by adjacent three layers and forms, innermost layer lifting swivel nut be threaded with drive screw and adjacent lifting swivel nut between be threaded mutually.

Above-mentioned driving device comprises the little tooth difference speed reducer that an end links to each other with electrical motor, the other end is connected with the cross universal transmission shaft, an end links to each other with the end of cross universal transmission shaft, the other end with rise the gear cluster that device links to each other.

Above-mentioned gear cluster comprises first conical gear that is connected with the end of cross universal transmission shaft, be fixed on second conical gear at vertical S. A. middle part with the first conical gear ingear, be fixed on first spur wheel of S. A. bottom and with the engagement of first spur wheel and be fixed on second spur wheel of rising on the device screw rod bearing disc.

The cross universal transmission shaft that is connected with electrical motor is provided with slip joint, and electrical motor is arranged on the electrical motor mounting dolly with dolly wheel, and electrical motor mounting dolly is paid with rotation and risen the device support and be connected.

Because the utility model has adopted the pressure-bearing steel ball and protected the design of steady steel ball, the setting of protecting steady steel ball is stably rotated drive screw, has guaranteed that operation is stable, is applicable to the maintenance activity of autotruck.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

Fig. 1 is the structural representation of the utility model embodiment, as shown in the figure, electric screw-jacks, comprise driving device and be connected with driving device rise device, with driving device bonded assembly electrical motor 13, rise device support 9; Rise device and include support bearing disc 6, the screw rod bearing disc 4 of the axle center of support bearing disc 6 rotation relatively, with screw rod bearing disc 4 bonded assembly spiral rising mechanisms, this rising mechanism comprises the drive screw 5 that is connected as a single entity with screw rod bearing disc 4, promote swivel nut group 2, be arranged on and promote the swivel nut group 2 outer spline sleeve groups 1 that limit its rotation, be fixedly connected on and promote the top cap 18 on the swivel nut group 2 and be arranged on travel switch 20 on the spline sleeve group 1.Promote swivel nut group 2 and be made up of three layers of adjacent lifting swivel nut, innermost layer promotes swivel nut and is threaded with drive screw (5), and is threaded mutually between the adjacent lifting swivel nut.Cooperate between support bearing disc 6 and the screw rod bearing disc 4 and form first ring-shaped guide rail 31, be provided with pressure-bearing steel ball 3 in this first ring-shaped guide rail 31, the outer of screw rod bearing disc 4 forms second ring-shaped guide rail 71 with rising to cooperate between the device support shell, is provided with in this second ring-shaped guide rail 71 and protects steady steel ball 7.

Above-mentioned driving device comprises that little tooth difference speed reducer 14, one ends that an end links to each other with electrical motor 13, the other end is connected with cross universal transmission shaft 15 link to each other with the end of cross universal transmission shaft 15, the other end with rise the gear cluster that device links to each other.

Above-mentioned gear cluster comprises first conical gear 16 that is connected with the end of cross universal transmission shaft 15, be fixed on second conical gear 19 at vertical S. A. 17 middle parts with first conical gear, 16 ingears, be fixed on first spur wheel 10 of S. A. 17 bottoms and with 10 engagements of first spur wheel and be fixed on second spur wheel 8 of rising screw rod bearing disc 4 on the device.

In order to guarantee to rise the mobility of device support 9 self-alignments, the cross universal transmission shaft that is connected with electrical motor is provided with slip joint, electrical motor is arranged on the electrical motor mounting dolly with dolly wheel, and electrical motor mounting dolly is paid with rotation and risen the device support and be connected.

Owing to adopted direct motor drive, therefore, can reduce labor intensity greatly.In addition, rise device, screw mutually with adjacent screw thread because the middle swivel nut that promotes all is shaped on internal and external threads, outermost layer promotes the swivel nut periphery does not have outside thread, but matches with spline sleeve group 1, and outer swivel nut can only be moved up and down, can not rotate, thereby realize the spiral upward movement.And promote swivel nut group 2 and comprise that three promote swivel nuts, so present embodiment can obtain the bigger stroke of rising.Be contained in the travel switch restriction excess of stroke on the spline sleeve, prevent to damage jack-up machine.

Thereby above-mentioned pressure-bearing steel ball 3 and the steady steel ball 7 of guarantor make screw rod bearing disc 4 stably to rotate guarantees that operation is stable.Owing to adopted little tooth difference speed reducer to carry out transmission, can obtain big transmitting ratio, make structure of the present utility model very compact.Since adopt first conical gear 16 and second conical gear 19 to carry out transmission, the drive path vertical duction of exerting all one's strength, and second conical gear 19 drives first spur wheel 10 again, thereby second spur wheel 8 that is meshed is with it rotated.Can do second spur wheel, 8 diameters little, so just can do for a short time, make and rise the device compact dimensions rising device support bearing disc.The lifting weight of present embodiment is 30 tons, and stroke is 200 centimetres to 490 centimetres.

The working process of present embodiment is such: drive little tooth difference speed reducer 14 by electrical motor 13 and drive first conical gear 16 by universal joint cross transmission shaft 15, passing to second conical gear, 19 drives, first spur wheel 10 by the first conical gear gear 16 again rotates second spur wheel 8 that is meshed with it, drive screw 5 is rotated, make and promote swivel nut group 2 rising successively, so just rise tall hat 17, thus the purpose that the operation thing is risen in realization.

Claims (5)

1, a kind of electric screw-jacks comprises driving device and the spiral device of rising that is driven by driving device, with driving device bonded assembly electrical motor (13), rises device support (9); The described spiral device of rising comprises the support bearing disc of rising on the device support (6), and the screw rod bearing disc (4) of the axle center of support bearing disc (6) rotation relatively is with described screw rod bearing disc (4) bonded assembly spiral rising mechanism; It is characterized in that: cooperate between described support bearing disc (6) and the described screw rod bearing disc (4) to form first ring-shaped guide rail (31), be provided with pressure-bearing steel ball (3) in this first ring-shaped guide rail (31), the outer of described screw rod bearing disc (4) forms second ring-shaped guide rail (71) with rising to cooperate between the device support shell, is provided with in this second ring-shaped guide rail (71) and protects steady steel ball (7).

2, electric screw-jacks according to claim 1, it is characterized in that: described spiral rising mechanism comprises the drive screw (5) that is connected as a single entity with described screw rod bearing disc (4), promote swivel nut group (2), be arranged on outer its outermost layer that limits of described lifting swivel nut group (2) and promote the spline sleeve group (1) that swivel nut rotates, be fixedly connected on the top cap (18) on the described lifting swivel nut group (2) and be arranged on travel switch (20) on the described spline sleeve group (1); Promote swivel nut group (2) and promote swivel nuts by adjacent three layers and forms, innermost layer lifting swivel nut is threaded with described drive screw (5), be threaded mutually between the adjacent lifting swivel nut.

3, electric screw-jacks according to claim 1, it is characterized in that: described driving device comprises the little tooth difference speed reducer (14) that an end links to each other with described electrical motor (13), the other end is connected with cross universal transmission shaft (15), an end links to each other with the end of described cross universal transmission shaft (15), the other end with rise the gear cluster that device links to each other.

4, electric screw-jacks according to claim 3, it is characterized in that: described gear cluster comprises first conical gear (16) that is connected with the end of described cross universal transmission shaft (15), be fixed on second conical gear (19) at vertical S. A. (17) middle part with described first conical gear (16) ingear, be fixed on first spur wheel (10) of described S. A. (17) bottom and with first spur wheel (10) engagement and be fixed on second spur wheel of rising on the device screw rod bearing disc (4) (8).

5, according to the described electric screw-jacks of arbitrary claim in the claim 1 to 4, it is characterized in that: the cross universal transmission shaft (15) that is connected with electrical motor is provided with slip joint, electrical motor is arranged on the electrical motor mounting dolly (11) with dolly wheel (12), and electrical motor mounting dolly (11) is paid with rotation and risen device support (9) and be connected.