Electric push rod

Abstract

The utility model provides an electric push rod which comprises a motor, a push rod outer sleeve, a push rod inner sleeve, a lead screw and a lead screw nut, the push rod inner sleeve is arranged in the push rod outer sleeve, the lead screw is arranged in the push rod inner sleeve, the lead screw nut is connected to the lead screw and connected with the push rod inner sleeve, and the motor can drive the lead screw to rotate around the axis of the lead screw. The push rod further comprises a transition sleeve and a guide sleeve, the transition sleeve is connected between the push rod inner sleeve and the lead screw nut, the guide sleeve is arranged at one end of the push rod inner sleeve and arranged on the outer side of the transition sleeve and / or the lead screw nut in a sleeving mode, and the guide sleeve is connected with the transition sleeve. The guide sleeve is in sliding fit with the inner wall of the push rod outer sleeve; compared with an existing circular electric push rod, the electric push rod has the advantages of being high in rigidity and good in stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric push rod field, concretely relates to a square electric push rod. BACKGROUND

[0002] Electric push rod is a kind of electric power drive device that the rotary motion of motor is changed into the linear reciprocating motion of push rod.The existing electric push rod such as the public number CN106469956A includes motor, push rod, push rod cover and screw rod, push rod is arranged in push rod cover, copper nut is equipped on screw rod, the first end of copper nut is directly connected with push rod, the second end of copper nut protrudes the end of push rod, the middle part of copper nut is provided with protruding part, from its drawing, copper nut second end is equipped with guide piece, guide piece can be slidably fitted with the inner wall of push rod cover, plays the guiding role, the axial width of guide piece is less than the axial width of protruding part, and the outer peripheral wall of protruding part is close to the inner wall of push rod cover.When motor drives screw rod to rotate around its axis, copper nut can drive push rod and guide piece to move linearly reciprocatingly in push rod cover.In long-term use, guide piece will be worn, if not timely replacement, will lead to the stability of electric push rod to be poor, so that copper nut is prone to directly contact with the inner wall of push rod cover, leads to the wear condition of copper nut also.

[0003] In addition, the existing push rod and push rod cover are generally circular, and the rigidity and stability are poor. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of electric push rod that rigidity is strong, stability is good and service life is long.

[0005] In order to realize the above-mentioned purpose, the utility model provides an electric push rod, which includes a motor, a push rod outer sleeve, a push rod inner sleeve, a screw rod and a screw rod nut. The push rod inner sleeve is arranged in the push rod outer sleeve, the screw rod is arranged in the push rod inner sleeve, the screw rod nut is connected to the screw rod and connected to the push rod inner sleeve. The motor can drive the screw rod to rotate around its own axis, and then drive the push rod inner sleeve to move linearly relative to the push rod outer sleeve through the screw rod nut. The electric push rod further includes a transition sleeve and a guide sleeve. The transition sleeve is connected between the push rod inner sleeve and the screw rod nut. The guide sleeve is arranged at one end of the push rod inner sleeve and sleeved on the outside of the transition sleeve and / or the screw rod nut. The guide sleeve is connected to the transition sleeve and slidably fitted with the inner wall of the push rod outer sleeve.

[0006] From the above scheme can be seen, by the above setting, the guide sleeve and the push rod inner sleeve sliding fit, both play a guiding role, also play the role of protection of the lead screw nut, even if the guide sleeve wear, lead screw nut will not be in direct contact with the push rod outer sleeve inner wall, is conducive to avoiding the lead screw nut wear; compared with the prior art, the axial width of the guide sleeve of the utility model is larger, the contact area of the guide sleeve and the push rod outer sleeve inner wall is larger, which is conducive to improving the stability and service life of the electric push rod, prolonging the service life of the guide sleeve.

[0007] Further scheme is, the first end of the transition sleeve is arranged in the push rod inner sleeve, the second end of the transition sleeve protrudes from the end of the push rod inner sleeve, the guide sleeve is sleeved on the second end of the transition sleeve, and the guide sleeve is detachably connected with the transition sleeve.

[0008] From the above scheme can be seen, by the above setting, when the guide sleeve is worn to a certain extent, the guide sleeve can be detached from the transition sleeve, so that the new guide sleeve can be replaced in time.

[0009] Further scheme is, the guide sleeve is detachably connected with the transition sleeve through the first connecting piece, or the guide sleeve is threadedly connected with the second end of the transition sleeve, or the guide sleeve is clamped with the second end of the transition sleeve.

[0010] Further scheme is, the transition sleeve is provided with a first connecting portion, a second connecting portion and a first mounting hole, the first connecting portion is arranged in the push rod inner sleeve, the second connecting portion protrudes from the end of the push rod inner sleeve, the first mounting hole penetrates the first connecting portion and the second connecting portion in the axial direction, and the second connecting portion is coaxially arranged with the first mounting hole, and the first end of the lead screw nut is fixedly connected in the first mounting hole.

[0011] From the above scheme can be seen, by the above setting, the transition sleeve and the lead screw nut are coaxially arranged.

[0012] Further scheme is, the guide sleeve is provided with a first stepped hole and a second stepped hole which are communicated in the axial direction of the guide sleeve, the first stepped hole is connected with the second connecting portion, and the second end of the lead screw nut is arranged in the second stepped hole.

[0013] From the above scheme can be seen, by the above setting, the guide sleeve and the lead screw nut are coaxially arranged.

[0014] Further scheme is, the electric push rod further comprises a reduction box, a first fixing sleeve and a second fixing sleeve, the motor is connected to the input end of the reduction box, the lead screw is connected to the output end of the reduction box, the output end of the reduction box is provided with an annular flange, and the annular flange is coaxially arranged with the lead screw; the first fixing sleeve is connected with the reduction box and the push rod outer sleeve respectively, and the second fixing sleeve is arranged in the first fixing sleeve and is in positioning cooperation with the annular flange.

[0015] From the above scheme can be seen, by setting the first fixed sleeve and the second fixed sleeve, ensure the smooth assembly of the electric push rod, avoid the situation that cannot be assembled.

[0016] Further, the first fixed sleeve is fixedly connected with the end of the push rod outer sleeve, the first fixed sleeve is detachably connected with the reduction box through the second connecting piece, and the second fixed sleeve is detachably connected with the first fixed sleeve and the annular flange, respectively.

[0017] From the above scheme can be seen, through the above setting, not only facilitate the assembly and disassembly of the electric push rod, but also facilitate the later maintenance.

[0018] Further, the first fixed sleeve is fixedly connected with the end of the push rod outer sleeve, the first fixed sleeve is detachably connected with the reduction box through the second connecting piece, and the second fixed sleeve is detachably connected with the first fixed sleeve and the annular flange, respectively.

[0019] Further, the push rod inner sleeve, the push rod outer sleeve and the guide sleeve are all rectangular and matched with each other.

[0020] From the above scheme can be seen, through the above setting, compared with the existing circular electric push rod, the rectangular electric push rod has better rigidity and stability.

[0021] Further, the third fixed sleeve is arranged on the end of the push rod outer sleeve, the third fixed sleeve is provided with a stop portion, the stop portion abuts against the gasket, and the push rod inner sleeve can move linearly relative to the gasket and the third fixed sleeve.

[0022] From the above scheme can be seen, through the above setting, the push rod inner sleeve moves linearly and reciprocally in the push rod outer sleeve under the joint action of the guide sleeve and the gasket. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of an embodiment of the utility model.

[0024] Figure 2 is a local structural schematic diagram of an embodiment of the utility model.

[0025] Figure 3 is a top view of the guide sleeve in an embodiment of the utility model.

[0026] Figure 4This is a top view of the transition sleeve in an embodiment of this utility model.

[0027] Figure 5 This is a cross-sectional view of the first fixing sleeve, the second fixing sleeve, and the push rod outer sleeve in an embodiment of this utility model.

[0028] Figure 6 This is a bottom view of the first fixed sleeve in an embodiment of this utility model.

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0030] See Figure 1 and Figure 2 The electric push rod provided in this embodiment includes a motor 1, a reduction gearbox 2, a push rod outer sleeve 3, a push rod inner sleeve 4, a lead screw 5, a lead screw nut 6, a transition sleeve 7, and a guide sleeve 8.

[0031] The cross-sections of the push rod outer sleeve 3 and the push rod inner sleeve 4 are both set to match each other, such as being rectangular or circular. Existing electric push rods are generally circular, and circular electric push rods generally have poor stability and rigidity. The electric push rod in this embodiment is set to a rectangle, preferably a square. That is, the push rod outer sleeve 3, the push rod inner sleeve 4, and the guide sleeve 8 in this embodiment are all set to match each other as squares, which is beneficial to improving the stability and rigidity of the electric push rod.

[0032] The inner sleeve 4 of the push rod is located inside the outer sleeve 3 of the push rod. One end of the inner sleeve 4 is provided with a transition sleeve 7 and a guide sleeve 8. The first end of the transition sleeve 7 is located inside the inner sleeve 4 and is fixed by welding; the second end of the transition sleeve 7 protrudes from the end of the inner sleeve 4. The guide sleeve 8 and the transition sleeve 7 are both located at the same end of the inner sleeve 4. The guide sleeve 8 is fitted on the outside of both the transition sleeve 7 and the lead screw nut 6, and the guide sleeve 8 and the transition sleeve 7 are detachably connected, preferably by screws. The lead screw 5 is located inside the inner sleeve 4, the lead screw nut 6 is connected to the lead screw 5, and the transition sleeve 7 is connected between the inner sleeve 4 and the lead screw nut 6.

[0033] Motor 1 is connected to the input end of gearbox 2, and lead screw 5 is connected to the output end of gearbox 2. Motor 1 drives lead screw 5 to rotate around its own axis through gearbox 2, which in turn drives inner sleeve 4 and guide sleeve 8 to move linearly relative to outer sleeve 3 of push rod through lead screw nut 6. Lead screw nut 6 and transition sleeve 7 are preferably made of metal; guide sleeve 8 can be made of nylon, plastic or metal, etc., and nylon is preferred in this embodiment.

[0034] The guide sleeve 8 of the embodiment is in sliding fit with the inner wall of the push rod outer sleeve 3, and plays a guiding role. Even if the guide sleeve 8 is worn due to long-term use, it only needs to be replaced. The cost of the guide sleeve 8 is lower than that of the lead screw nut 6, which is conducive to facilitating later maintenance and reducing maintenance costs.

[0035] The guide sleeve 8 of the embodiment is sleeved on the outside of the transition sleeve 7 and the lead screw nut 6. On the one hand, it is conducive to increasing the axial length of the guide sleeve 8, increasing the contact area between the guide sleeve 8 and the inner wall of the push rod outer sleeve 3, and further improving the stability. On the other hand, the guide sleeve 8 also plays a role in protecting the lead screw nut 6. Even if the guide sleeve 8 is worn, the lead screw nut 6 will not directly contact the inner wall of the push rod outer sleeve 3, avoiding the situation that the lead screw nut 6 is worn due to the guide sleeve 8 not being replaced in time.

[0036] In combination with Figure 2 and Figure 4 , the transition sleeve 7 is provided with a first connecting portion 71, a second connecting portion 72, and a first mounting hole 73. The first connecting portion 71 is rectangular, preferably square, and is configured to cooperate with the push rod inner sleeve 4. The second connecting portion 72 is circular, and the axis of the second connecting portion 72 is collinear with the center line of the first connecting portion 71. The outer diameter of the second connecting portion 72 is smaller than the width of the first connecting portion 71. The first connecting portion 71 is welded and fixed in the push rod inner sleeve 4. The second connecting portion 72 protrudes from the end of the push rod inner sleeve 4. The first mounting hole 73 penetrates the first connecting portion 71 and the second connecting portion 72 in the axial direction, and the second connecting portion 72 is coaxially arranged with the first mounting hole 73. The first end of the lead screw nut 6 is connected in the first mounting hole 73. Specifically, the first mounting hole 73 is a threaded hole, and the first end of the lead screw nut 6 is provided with an external thread portion that is threadedly connected with the first mounting hole 73. A thread fixing agent is also applied between the external thread portion and the first mounting hole 73 to ensure that the lead screw nut 6 is fixedly connected with the transition sleeve 7.

[0037] At least two second mounting holes 74 are formed in the first connecting portion 71. In this embodiment, four second mounting holes 74 are provided, which are arranged on the corners of the first connecting portion 71 and outside the second connecting portion 72. The second mounting holes 74 are preferably threaded holes.

[0038] In combination with Figure 2 and Figure 3 , the guide sleeve 8 is rectangular, preferably square, and matches the push rod outer sleeve 3. A first stepped hole 81 and a second stepped hole 82 are formed in the middle of the guide sleeve 8 in communication along the axial direction. The first stepped hole 81 and the second stepped hole 82 are coaxially arranged, and the inner diameter of the first stepped hole 81 is larger than that of the second stepped hole 82. The first stepped hole 81 is positioned and matched with the second connecting portion 72. The second end of the lead screw nut 6 is arranged in the second stepped hole 82, and the lead screw nut 6 is clearance-fitted with the second stepped hole 82.

[0039] The guide sleeve 8 is further provided with at least two third mounting holes 83 corresponding to the second mounting holes 74. The guide sleeve 8 is detachably connected to the transition sleeve 7 through a first connecting member penetrating through the third mounting holes 83 and being connected in the second mounting holes 74. The first connecting member is preferably a screw.

[0040] The guide sleeve 8 of the embodiment is sleeved on the second end of the transition sleeve 7 and detachably connected to the transition sleeve 7. When the guide sleeve 8 is worn, the guide sleeve 8 can be conveniently replaced, and the operation is simple and convenient.

[0041] In other embodiments, the guide sleeve can be directly screwed with the second end of the transition sleeve, or the guide sleeve can be clamped with the second end of the transition sleeve.

[0042] In combination with Figure 2 , Figure 5 and Figure 6 , the output end of the speed reducer 2 is further provided with an annular flange (not shown in the figure) coaxially arranged with the lead screw 5.

[0043] The electric push rod further comprises a first fixing sleeve 9 and a second fixing sleeve 10, which are preferably made of metal material. The first fixing sleeve 9 is connected with the speed reducer 2 and the push rod outer sleeve 3 respectively, and the second fixing sleeve 10 is arranged in the first fixing sleeve 9 and positioned with the annular flange, thereby playing a role of radial positioning for the first fixing sleeve 9. Specifically:

[0044] The inner side of the first fixing sleeve 9 is sequentially provided with a first accommodating groove 91, a convex ring portion 92 and a second accommodating groove 93 along the axial direction thereof. The center line of the first accommodating groove 91 and the center line of the second accommodating groove 93 are collinear. The cross-sectional shape of the first accommodating groove 91 matches the cross-sectional shape of the push rod outer sleeve 3, and a first stop surface 94 is formed between the first accommodating groove 91 and the convex ring portion 92. One end of the push rod outer sleeve 3 is arranged in the first accommodating groove 91, and the end face of the push rod outer sleeve 3 abuts against the first stop surface 94, thereby playing a role of axial positioning. The cross-sectional shape of the second accommodating groove 93 matches the cross-sectional shape of the second fixing sleeve 10, and a second stop surface 95 is formed between the second accommodating groove 93 and the convex ring portion 92.

[0045] The second fixing sleeve 10 is an annular structure, comprising a main body 101, a positioning ring 102, and a central hole 103. The main body 101 is disposed within the second receiving groove 93 and abuts against the second stop surface 95. The central hole 103 is located at the center of the second fixing sleeve 10 along its axial direction and penetrates the second fixing sleeve 10. The outer diameter of the positioning ring 102 is smaller than the outer diameter of the main body 101. An annular groove 104 is provided on the outer side of the positioning ring 102. The annular groove 104 is coaxially arranged with the central hole 103 and is used for a concave-convex fit with an annular flange.

[0046] The first fixed sleeve 9 is also provided with four fourth mounting holes 96, which extend axially. The output end of the gearbox 2 is provided with four fifth mounting holes 21, which correspond one-to-one with and communicate with the fourth mounting holes 96. The first fixed sleeve 9 is detachably connected to the gearbox 2 via a second connector 22, which passes through the fifth mounting holes 21 and is connected to the fourth mounting holes 96. The second connector 22 is preferably a screw.

[0047] In this embodiment, the first fixing sleeve 9 and the second fixing sleeve 10 are set separately, and the second fixing sleeve 10 is detachably connected to the first fixing sleeve 9 and the annular flange respectively. This can not only play the role of axial limiting and radial positioning, but also ensure that the square electric push rod can be assembled smoothly, which is convenient for subsequent inspection and maintenance.

[0048] In this embodiment, the inner width of the push rod outer sleeve 3 is greater than the inner diameter of the second fixed sleeve 10, and the inner diameter of the second fixed sleeve 10 is smaller than the outer diameter of the guide sleeve 8, so that the guide sleeve 8 can move along the inner wall of the push rod inner sleeve 4 toward the second fixed sleeve 10 until the end face of the guide sleeve 8 abuts against the end face of the second fixed sleeve 10. The second fixed sleeve 10 can provide axial positioning for the guide sleeve 8.

[0049] Of course, a protective cover (not shown in the figure) can also be installed inside the first fixed sleeve 9. The protective cover can be used to protect the bearing sleeved on the outside of the lead screw 5, and at the same time, the protective cover can be used to stop the guide sleeve 8.

[0050] exist Figure 1 In the push rod inner sleeve 4, a third fixing sleeve 50 and four washers 20 are provided at the end away from the motor 1. The four washers 20 are respectively provided on the outer surface of the four side walls of the push rod inner sleeve 4, and each washer 20 has two protrusions; the push rod outer sleeve 3 has two grooves 31 on each of its side walls. The washers 20 are positioned between the push rod outer sleeve 3 and the push rod inner sleeve 4, and the protrusions are embedded in the grooves 31 to restrict the movement of the washers 20 along the width direction of the push rod inner sleeve 4.

[0051] The third fixing sleeve 50 is provided with a stop portion at the four peripheral edges, and the stop portion is in abutment with the gasket 20 to limit the axial movement of the gasket 20 along the push rod inner sleeve 4.

[0052] The end of the push rod inner sleeve 4 away from the motor 1 extends out of the push rod outer sleeve 3, and the end of the push rod inner sleeve 4 away from the motor 1 is connected with the supporting leg 30 through the pin shaft 40, and the supporting leg 30 can rotate relative to the push rod inner sleeve 4 around the pin shaft 40 to better adapt to the ground.

[0053] The assembly sequence is as follows: firstly, the transition sleeve 7 and the push rod inner sleeve 4 are welded and fixed; then, the lead screw nut 6 is screwed into the transition sleeve 7; then, the guide sleeve 8 is fixedly connected with the transition sleeve 7 through a screw, at this time, the push rod inner sleeve 4, the transition sleeve 7, the lead screw nut 6 and the guide sleeve 8 are assembled into a first subassembly; then, the motor 1, the speed reducer 2 and the lead screw 5 are assembled to form a second subassembly; then, the second fixing sleeve 10 is sleeved outside the lead screw 5 and connected with the speed reducer 2; then, the first subassembly and the second subassembly are assembled, and the lead screw nut 6 is connected with the lead screw 5; then, the push rod outer sleeve 3 is welded and fixed with the first fixing sleeve 9 to form a third subassembly; then, the third subassembly is sleeved outside the first subassembly, and the first fixing sleeve 9 is fixedly connected with the speed reducer 2 through the second connecting piece 22; then, the gasket 20 and the third fixing sleeve 50 are assembled; and then, the supporting leg 30 is assembled.

[0054] As can be seen from the above, through the above-mentioned arrangement, the guide sleeve and the push rod inner sleeve are in sliding cooperation, which not only plays a guiding role, but also plays a role in protecting the lead screw nut, so that even if the guide sleeve is worn, the lead screw nut will not directly contact the inner wall of the push rod outer sleeve, which is conducive to avoiding wear of the lead screw nut; compared with the prior art, the axial width of the guide sleeve of the utility model is larger, and the contact area of the guide sleeve and the inner wall of the push rod outer sleeve is larger, which is conducive to improving the stability and service life of the electric push rod and prolonging the service life of the guide sleeve.

[0055] Finally, it should be emphasized that the above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and for those skilled in the art, the utility model can have various changes and modifications, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An electric push rod, comprising a motor, a push rod outer sleeve, a push rod inner sleeve, a lead screw and a lead screw nut, the push rod inner sleeve is arranged in the push rod outer sleeve, the lead screw is arranged in the push rod inner sleeve, the lead screw nut is connected to the lead screw and the push rod inner sleeve, the motor can drive the lead screw to rotate around its own axis, and then drive the push rod inner sleeve to move linearly relative to the push rod outer sleeve through the lead screw nut, characterized in that: further comprising a transition sleeve and a guide sleeve, the transition sleeve is connected between the push rod inner sleeve and the lead screw nut, the guide sleeve is arranged at one end of the push rod inner sleeve and is sleeved outside the transition sleeve and / or the lead screw nut, the guide sleeve is connected with the transition sleeve, and the guide sleeve is in sliding fit with the inner wall of the push rod outer sleeve.

2. The electric push rod according to claim 1, characterized in that: a first end of the transition sleeve is arranged in the push rod inner sleeve, a second end of the transition sleeve protrudes from the end of the push rod inner sleeve, the guide sleeve is sleeved on the second end of the transition sleeve, and the guide sleeve is detachably connected with the transition sleeve.

3. The electric push rod according to claim 2, characterized in that: the guide sleeve is detachably connected with the transition sleeve through a first connecting piece, or the guide sleeve is threadedly connected with the second end of the transition sleeve, or the guide sleeve is clamped with the second end of the transition sleeve.

4. The electric push rod according to claim 3, characterized in that: the transition sleeve is provided with a first connecting part, a second connecting part and a first mounting hole, the first connecting part is arranged in the push rod inner sleeve, the second connecting part protrudes from the end of the push rod inner sleeve, the first mounting hole penetrates the first connecting part and the second connecting part in the axial direction, the second connecting part is coaxially arranged with the first mounting hole, and a first end of the lead screw nut is fixedly connected in the first mounting hole.

5. The electric push rod according to claim 4, characterized in that: the guide sleeve is provided with a first stepped hole and a second stepped hole which are in communication in the axial direction of the guide sleeve, the first stepped hole is connected with the second connecting part, and a second end of the lead screw nut is arranged in the second stepped hole.

6. The electric push rod according to any one of claims 1 to 5, characterized in that: the electric push rod further comprises a reduction box, a first fixed sleeve and a second fixed sleeve, the motor is connected to the input end of the reduction box, the lead screw is connected to the output end of the reduction box, the output end of the reduction box is provided with an annular flange which is coaxially arranged with the lead screw; the first fixed sleeve is connected with the reduction box and the push rod outer sleeve respectively, and the second fixed sleeve is arranged in the first fixed sleeve and is positioned with the annular flange.

7. The electric push rod according to claim 6, characterized in that: the first fixed sleeve is fixedly connected with the end of the push rod outer sleeve, the first fixed sleeve is detachably connected with the reduction box through a second connecting piece, and the second fixed sleeve is detachably connected with the first fixed sleeve and the annular flange respectively.

8. The electric push rod according to claim 7, characterized in that: ​ ​ ​ ​ ​ ​ ​ The inner side of the first fixing sleeve is sequentially provided with a first accommodating groove, a convex ring part and a second accommodating groove along the axial direction, the center line of the first accommodating groove and the center line of the second accommodating groove are collinear, a first stop surface is formed between the first accommodating groove and the convex ring part, and a second stop surface is formed between the second accommodating groove and the convex ring part; The second fixing sleeve comprises a main body part and a positioning ring part, the outer side of the positioning ring part is provided with an annular groove, the main body part is arranged in the second accommodating groove, the positioning ring part is arranged in the annular flange, and the annular groove and the annular flange are in concave-convex cooperation.

9. The electric trolley according to any one of claims 1 to 5, wherein: The inner sleeve, the outer sleeve and the guide sleeve are all rectangular and match with each other.

10. The electric trolley according to any one of claims 1 to 5, wherein: A third fixing sleeve and a plurality of spacers are arranged on the end of the inner sleeve away from the motor, the spacers are arranged between the side wall of the inner sleeve and the side wall of the outer sleeve, the third fixing sleeve is sleeved on the end of the outer sleeve, a stop part is arranged on the third fixing sleeve, the stop part abuts against the spacers, and the inner sleeve can move linearly relative to the spacers and the third fixing sleeve.

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