Steering electric cylinder

Abstract

The utility model relates to the technical field of electric cylinders, in particular to a steering electric cylinder, which is used on a steering mechanism of an electric forklift and comprises a motor, a box body, a transmission mechanism and a cylinder body component, the cylinder body component comprises a left cylinder barrel and a right cylinder barrel which are symmetrically arranged, and one end of the left cylinder barrel and one end of the right cylinder barrel are connected with the box body. The transmission mechanism is arranged in the box body and comprises a lead screw assembly and a transmission gear set, the lead screw assembly comprises a lead screw and a lead screw nut, the two ends of the lead screw are connected with one ends of the two piston rods respectively, and a gear meshed with a transmission gear in the transmission gear set is arranged on the periphery of the lead screw nut. Oil pressure driving is replaced by motor driving, so that the problem of oil leakage is avoided; the nut is adopted to drive the lead screw to do reciprocating rectilinear motion, and accurate control over the rectilinear motion of the lead screw can be achieved; the speed, thrust, temperature and other data of the electric cylinder are collected in real time and monitored and fed back in real time, closed-loop control is achieved, and the system adapts to load changes.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric cylinder technical field especially a steering electric cylinder. BACKGROUND

[0002] Forklift is widely used because of its steering flexibility and strong mobility. Steering mechanism is a key component of forklift, which has an important influence on forklift mobility and energy saving. Figure 1 As shown in the figure, the prior art generally uses oil cylinder A to drive forklift steering. The hydraulic oil pressure is large, the sealing structure is complex, and long-term use can cause sealing aging and wear, resulting in failure and pollution. In addition, the steering mechanism driven by the oil cylinder A cannot accurately monitor and realize the size and speed of the thrust in real time, cannot realize closed-loop control, is difficult to adapt to load changes, and causes performance degradation. UTILITY MODEL CONTENTS

[0003] The utility model solves the technical problems: in order to solve the prior art problems in the background art, provide a kind of steering electric cylinder.

[0004] The utility model solves the technical problems and adopts the technical scheme: a kind of steering electric cylinder, for the steering mechanism of electric forklift, including motor, box, transmission mechanism and cylinder body assembly, the cylinder body assembly includes the left cylinder barrel and right cylinder barrel of symmetrical arrangement, one end of the left cylinder barrel and right cylinder barrel is connected with box, and one piston rod is respectively arranged in the left cylinder barrel and right cylinder barrel, the transmission mechanism is arranged in box, and transmission mechanism includes screw rod assembly and transmission gear set, the screw rod assembly includes screw rod and screw rod nut, the both ends of the screw rod are connected with the one end of two piston rods respectively, the outer periphery of the screw rod nut is equipped with the gear meshing with transmission gear in transmission gear set.

[0005] Further, the transmission gear set includes transmission gear and gear I, the transmission gear is double coupling gear shaft, which has shaft and first gear and second gear integrated on the shaft, the first gear is meshed with the gear on the outer periphery of screw rod nut, the gear I is installed on the shaft by means of flat key, and is meshed with the gear segment on the motor shaft, the second gear is located at one end of the shaft.

[0006] Further, the box is also connected with control box, the control box is installed with circuit board and feedback assembly, the feedback assembly is composed of gear mounting frame, gear assembly installed on gear mounting frame and magnet installed on gear assembly, the feedback signal element is installed on the circuit board at the position corresponding to the magnet.

[0007] Further, the gear assembly comprises gear II, gear III, feedback gear I and feedback gear II, the gear II is engaged with the second gear, the gear III is coaxial with the gear II and engaged with the feedback gear I, the feedback gear II is engaged with the feedback gear I, and the feedback gear I and the feedback gear II are provided with magnets on the mounting shafts.

[0008] Further, the two ends of the transmission gear are mounted on the box through deep groove ball bearings respectively, the second gear is located in the control box, and a rotary sealing ring is arranged on the side, close to the deep groove ball bearing, of the control box.

[0009] Further, the left cylinder and the right cylinder are connected with end covers at the ends, away from the box, of the left cylinder and the right cylinder, and a guide sleeve, a dust ring and a rod sealing ring are arranged between the end covers and the piston rods.

[0010] Further, the piston rod is connected with a rod head at the end, away from the lead screw, of the piston rod, an adjusting gasket is arranged at the connecting position of the piston rod and the rod head, a through hole is formed in the rod head, and a graphite copper sleeve is mounted in the through hole.

[0011] Further, an annular groove is formed in the outer periphery of the end, connected with the lead screw, of the piston rod, and a guide ring is mounted in the annular groove.

[0012] Further, the lead screw nut is mounted on the box through tapered roller bearings.

[0013] Further, the lead screw nut is of an integral structure, the outer ring of the lead screw nut is provided with a gear, the inner wall of the lead screw nut is provided with a raceway, and bearing mounting portions are arranged on the two sides of the gear of the lead screw nut.

[0014] The utility model discloses the beneficial effect that:

[0015] The utility model discloses motor drive replaces oil pressure drive, need not to be equipped with oil pump and circulating oil circuit, directly drive through motor, and installation is simple and convenient, does not use hydraulic oil drive, and there is no risk of oil leakage, and sealing is easy, and does not need to replace sealing element, thereby avoiding the problem of oil leakage.

[0016] The nut drives the lead screw, the nut rotary motion drives the lead screw reciprocating linear motion, and the cooperation of the lead screw and the nut can realize high transmission efficiency, and the rotation angle of the nut can be accurately controlled, so that the linear motion of the lead screw can be accurately controlled.

[0017] The driving control circuit board and the feedback assembly are arranged in the control box, the speed, the thrust and the temperature of the electric cylinder are collected in real time, real-time monitoring and feedback are realized, closed-loop control is realized, the change of the load is adapted, and the performance is improved. DRAWINGS

[0018] The utility model will be further explained in connection with the drawings and examples.

[0019] Figure 1 is a schematic view of the structure of a forklift steering mechanism in the prior art.

[0020] Figure 2 is a schematic view of the structure of a steering electric cylinder of the present application.

[0021] Figure 3 is a schematic view of the structure of a steering electric cylinder of the present application. Figure 2 is a top view of

[0022] Figure 4 is a sectional view in the B-B direction of Figure 3

[0023] Figure 5 is a schematic view of the structure of a screw rod assembly in the steering electric cylinder of the present application.

[0024] Figure 6 is a schematic view of the structure of a screw rod nut in the steering electric cylinder of the present application. Figure 5

[0025] Figure 7 is a schematic view of the structure of a feedback assembly in the steering electric cylinder of the present application.

[0026] Figure 8 is a schematic view of the internal structure of Figure 7

[0027] is a schematic view of the structure of a circuit board in the steering electric cylinder of the present application. Figure 9 In the figure: A, oil cylinder; 1, box body; 2, left cylinder barrel; 3, right cylinder barrel; 4, piston rod; 5, screw rod; 6, screw rod nut; 61, gear; 62, raceway; 63, bearing mounting portion; 7, transmission gear; 71, shaft rod; 72, first gear; 73, second gear; 8, end cover; 9, guide sleeve; 10, dust-proof ring; 11, rod sealing ring; 12, rod head; 121, through hole; 13, adjusting gasket; 14, graphite copper sleeve; 15, guide ring; 16, control box; 17, circuit board; 171, feedback signal element; 18, feedback assembly; 181, gear mounting rack; 182, magnet; 183, gear II; 184, feedback gear I; 185, feedback gear II; 186, gear III; 19, gear I; 20, motor; 21, deep groove ball bearing; 22, rotary sealing ring; 23, tapered roller bearing.

[0028] DETAILED DESCRIPTION

[0029] The present application will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views which only show the basic structure of the present application in a schematic manner, and thus only show the components relevant to the present application.

[0030] As Figures 2-5 ​​​As shown, a steering electric cylinder is used in the steering mechanism of an electric forklift, including a motor 20, a housing 1, a transmission mechanism, and a cylinder assembly. The cylinder assembly includes a left cylinder 2 and a right cylinder 3 arranged symmetrically. One end of the left cylinder 2 and the right cylinder 3 is connected to the housing 1, and a piston rod 4 is provided in the left cylinder 2 and the right cylinder 3 respectively. The transmission mechanism is located in the housing 1 and includes a lead screw assembly and a transmission gear set. The lead screw assembly includes a lead screw 5 and a lead screw nut 6. The two ends of the lead screw 5 are respectively connected to one end of the two piston rods 4. A gear 61 that meshes with the transmission gear 7 in the transmission gear set is provided on the outer periphery of the lead screw nut 6.

[0031] The left cylinder 2 and right cylinder 3 are connected to end caps 8 at their ends furthest from the housing 1. To ensure stable linear extension of the piston rod 4, a guide sleeve 9 is provided between the end cap 8 and the piston rod 4. When the piston rod 4 extends linearly, to prevent foreign objects from entering the surface of the lead screw 5 and disrupting the movement of the lead screw 5 and lead screw nut 6, a dustproof ring 10 and a rod sealing ring 11 are provided between the end cap 8 and the piston rod 4, ensuring an IP65 protection rating. The end of the piston rod 4 furthest from the lead screw 5 is connected to a rod head 12. An adjusting shim 13 is provided at the connection point. A through hole 121 is provided on the rod head 12, and a graphite copper sleeve 14 is installed inside the through hole 121 for easy connection to a load. To ensure smooth linear movement of the piston rod 4, an annular groove is provided on the outer circumference of the end of the piston rod 4 connected to the lead screw 5. A guide ring 15 is installed inside the annular groove, and both sides of the lead screw 5 are supported by guide rings 15 to ensure balance.

[0032] Furthermore, the housing 1 is also connected to the control box 16. The control box 16 houses a circuit board 17 and a feedback component 18. The feedback component 18 consists of a gear mounting bracket 181, a gear assembly mounted on the gear mounting bracket 181, and a magnet 182 mounted on the gear assembly. A feedback signal element 171 is installed on the circuit board 17 at the position corresponding to the magnet 182, such as... Figure 9 As shown.

[0033] like Figure 4 As shown, the transmission gear set includes a transmission gear 7 and a gear I 19. The transmission gear 7 is a gear shaft, which has a shaft 71 and a first gear 72 and a second gear 73 integrated on the shaft 71. The first gear 72 meshes with a gear 61 on the outer periphery of the lead screw nut 6. The gear I 19 is mounted on the shaft 71 via a flat key and meshes with a gear segment on the shaft of the motor 20. The second gear 73 is located at one end of the shaft 71. Both ends of the transmission gear 7 are mounted on the housing 1 via a deep groove ball bearing 21. The second gear 73 is located in the control box 16, and a rotary seal ring 22 is provided on the side of the deep groove ball bearing 21 near the control box 16.

[0034] like Figure 5 and 6As shown, the screw nut 6 is an integral structure, the outer ring has a gear 61, and the inner wall is provided with a raceway 62. The screw nut 6 can also be made of a split structure, and rigid connection is adopted. Combined with Figure 3 , the screw nut 6 is installed on the box body 1 through the tapered roller bearing 23, and the two sides of the gear 61 on the screw nut 6 are provided with bearing mounting portions 63.

[0035] As shown in Figure 7 and Figure 8 , the gear assembly includes gear II 183, gear III 186, feedback gear I 184 and feedback gear II 185, gear II 183 is engaged with the second gear 73, gear III 186 is coaxial with gear II 183 and is engaged with feedback gear I 184, feedback gear II 185 is engaged with feedback gear I 184, and magnets 182 are arranged on the mounting shafts of feedback gear I 184 and feedback gear II 185.

[0036] Specific working process: when the motor 20 rotates clockwise, the gear segment on the shaft of the motor 20 drives the gear I 19 to rotate counterclockwise, the gear I 19 is assembled on the shaft rod 71 of the transmission gear 7, thereby driving the transmission gear 7 to rotate counterclockwise, the first gear 72 on the transmission gear 7 is partially engaged with the screw nut 6 (the outer ring of the screw nut 6 has a gear 61) to drive the screw nut 6 to rotate clockwise, the screw nut 6 is supported by the tapered roller bearings 23 on both sides, so that the screw nut 6 rotates around the screw rod 5, the screw nut 6 rotates clockwise to drive the screw rod 5 to move to the right, so that the piston rod 4 in the right cylinder barrel 3 extends linearly to the right; conversely, when the motor 20 rotates counterclockwise, the screw rod 5 moves to the left, so that the piston rod 4 in the left cylinder barrel 2 extends linearly to the left.

[0037] When the screw nut 6 rotates to drive the screw rod 5, the rotation of the screw rod 5 is limited due to the connection of the rod head 12 of the piston rod 4 with the load mechanism, which plays a role in preventing rotation, thereby realizing the linear motion of the screw rod 5 to the left and right.

[0038] When the transmission gear 7 rotates, the rotation of the second gear 73 drives the gear II 183 to rotate, so that the coaxial gear III 186 rotates, the feedback gear I 184 and the feedback gear II 185 rotate in turn, and then the two magnets 182 rotate. At this time, the two feedback signal elements 171 installed on the circuit board 17 at positions corresponding to the two magnets 182 can real-time feedback the stroke, speed and other related performance parameters of the electric cylinder, real-time monitoring and feedback, realizing closed-loop control, adapting to the change of load and improving performance.

[0039] With the above ideal embodiment of the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A turning electric cylinder, characterized by: The utility model provides a kind of hydraulic cylinder, including motor (20), box (1), transmission mechanism and cylinder body assembly, the cylinder body assembly includes symmetrically arranged left cylinder barrel (2) and right cylinder barrel (3), one end of left cylinder barrel (2) and right cylinder barrel (3) is connected with box (1), and left cylinder barrel (2) and right cylinder barrel (3) are equipped with a piston rod (4) respectively, transmission mechanism is arranged in box (1), transmission mechanism includes screw rod assembly and transmission gear group, the screw rod assembly includes screw rod (5) and screw nut (6), both ends of screw rod (5) are connected with one end of two piston rods (4) respectively, gear (61) is equipped on the outer periphery of screw nut (6) and engages with transmission gear (7) in transmission gear group.

2. The rotary electric cylinder according to claim 1, characterized by: The transmission gear group includes transmission gear (7) and gear I (19), the transmission gear (7) is double gear shaft, which has shaft rod (71) and integrated first gear (72) and second gear (73) on the shaft rod (71), the first gear (72) engages with the gear (61) on the outer periphery of the screw nut (6), the gear I (19) is installed on the shaft rod (71) by means of a flat key, and engages with the gear segment on the shaft of the motor (20), the second gear (73) is located at one end of the shaft rod (71).

3. The rotary electric cylinder according to claim 2, characterized by: The box (1) is also connected to the control box (16), the control box (16) is installed with a circuit board (17) and a feedback assembly (18), the feedback assembly (18) is composed of a gear mounting rack (181), a gear assembly mounted on the gear mounting rack (181), and a magnet (182) mounted on the gear assembly, and the circuit board (17) is installed with a feedback signal element (171) at a position corresponding to the magnet (182).

4. The rotary electric cylinder according to claim 3, characterized by: The gear assembly includes gear II (183), gear III (186), feedback gear I (184) and feedback gear II (185), the gear II (183) engages with the second gear (73), the gear III (186) is coaxial with the gear II (183) and engages with the feedback gear I (184), the feedback gear II (185) engages with the feedback gear I (184), and the installation shaft of the feedback gear I (184) and the feedback gear II (185) is provided with a magnet (182).

5. The rotary electric cylinder according to claim 3, characterized by: Both ends of the transmission gear (7) are installed on the box (1) through a deep groove ball bearing (21) respectively, the second gear (73) is located in the control box (16), and a rotating sealing ring (22) is arranged on the side of the deep groove ball bearing (21) close to the control box (16).

6. The rotary electric cylinder according to claim 1, characterized by: The left cylinder barrel (2) and the right cylinder barrel (3) are connected with an end cover (8) at the end away from the box (1), a guide sleeve (9), a dust ring (10) and a rod sealing ring (11) are arranged between the end cover (8) and the piston rod (4).

7. The rotary electric cylinder according to claim 1 or 5, characterized by: A rod head (12) is connected to the end of the piston rod (4) away from the screw rod (5), an adjusting gasket (13) is arranged at the connection between the two, a through hole (121) is formed in the rod head (12), and a graphite copper sleeve (14) is installed in the through hole (121).

8. The rotary electric cylinder according to claim 1 or 5, characterized by: The piston rod (4) is provided with an annular groove on the outer periphery of one end connected with the screw rod (5), and a guide ring (15) is installed in the annular groove.

9. The rotary electric cylinder according to claim 1, characterized by: The screw rod nut (6) is installed on the box (1) through a tapered roller bearing (23).

10. The rotary electric cylinder according to claim 9, characterized by: The screw rod nut (6) is an integral structure, the outer ring is provided with a gear (61), the inner wall is provided with a raceway (62), and the two sides of the gear (61) on the screw rod nut (6) are provided with bearing mounting portions (63).

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