WO2017197902A1

WO2017197902A1 - Smart electric drive cylinder device

Info

Publication number: WO2017197902A1
Application number: PCT/CN2017/000259
Authority: WO
Inventors: 潘微杰
Original assignee: 潘微杰
Priority date: 2016-05-20
Filing date: 2017-03-29
Publication date: 2017-11-23
Also published as: WO2017197543A1; CN205669517U; CN107143241B; CN107143241A; CN105952706B; CN105952706A

Abstract

A smart electric drive cylinder device, comprising an outer tube (1), a direct current motor (6), a reducer (5), a cylinder sleeve (2), a piston rod (4), a screw sleeve (31), a multi-head screw rod (3) and a positioning sleeve (33). The cylinder sleeve (2) moves back and forth with respect to the outer tube (1) and comprises a small cylinder sleeve (22) and a large cylinder sleeve (21), the small cylinder sleeve (22) being located at the middle of the large cylinder sleeve (21), an annular area being formed between an outer wall of the small cylinder sleeve (22) and an inner wall of the large cylinder sleeve (21). The piston rod (4) is hollow to form an inner cavity and a front end forms a piston (41), the piston rod (4) being sleeved on the small cylinder sleeve (22), the piston (41) being located within the annular area between the outer wall of the small cylinder sleeve (22) and the inner wall of the large cylinder sleeve (21). One end of the multi-head screw rod (3) is connected to an output end of the reducer (5), and the other end extends into the small cylinder sleeve (22) and is connected to and matched with the screw sleeve (31). Compared to the prior art, the present invention has the advantages of being compact in structure, lightweight and convenient, and low in noise.

Description

Intelligent electric drive cylinder device

Technical field

The present invention relates to an electric drive device, and more particularly to a drive device applied to a tailgate of an automobile.

Background technique

There are two main types of tailgates. The first one is the manual tailgate, which uses the gas spring to realize the manual switch. This type of structure is mainly used in the middle and low-end vehicles. The second is the electric tailgate, which uses the motor drive to realize the tailgate. The automatic lifting and lowering operation is convenient and quick, and at the same time solves the problem that most female passengers have difficulty in opening the tailgate due to small strength.

There are many types of driving devices for electric tailgates, such as the Chinese Patent Application No. 201310343833.3, entitled "Electrical Gas Springs" (Application Publication No. CN103410906A), which drives a motor to drive a piston rod to move back and forth. Thereby achieving automatic control, this structure is applied in the opening and closing of the tailgate of the automobile, and the length is large, and the telescopic distance is limited.

There is another type of improved structure. The Chinese invention patent application with the application number 201010288083.0 discloses the "automobile electric tailgate drive mechanism" (application publication number is CN101967930A), and the application includes a motor, a motor sleeve, a screw sleeve, and a multi-head. The lead screw, the multi-head nut and the spring, the multi-head screw is driven by the micro motor to move the multi-head nut relative to the multi-head screw, and the nut sleeve moves relative to the screw sleeve. Similarly, the Chinese invention patent application with the application number 201410206864.9 discloses the "automobile tailgate electric lifting device" (application publication number is CN105089408A).

The driving device of the above-mentioned electric tailgate is mainly supported by a steel spring, and the driving force is generated by the motor, and the expansion and contraction is realized by the screw rod. The steel spring has the following disadvantages: First, the steel spring has poor stability and is easily broken. There are safety hazards. Secondly, the weight of the tailgate of the car is different. It needs to adapt to different specifications of the drive device, and the steel spring torque can not be adjusted. Again, the steel spring is easy to rub against the steel pipe wall in the reciprocating motion to generate noise; The steel spring must be made relatively large, and the whole is relatively bulky, so that the bearing capacity is doubled when the tailgate is closed at both ends, and the strength requirements of the fixing devices at both ends are increased.

To this end, an improved driving device is disclosed in the prior art. See Chinese Patent Application No. 201510433203.4, entitled "Automotive Gas Spring Spring Strut of Automobile Back Door" (Application Publication No. CN105275301A), the application will be gas The spring structure and the motor-driven structure are compactly assembled in the same cylinder, and the gas spring replaces the steel spring, solving a series of problems caused by the steel spring. However, the technical solution of the application also has the following disadvantages: First, the noise is relatively large, and the noise mainly comes from the rotation of the motor itself and the multi-head screw and the multi-head screw sleeve; second, the overall structure is still bloated, and the internal air pressure is not fully utilized. Can not be small; third, the overall length is still longer, the application is more limited; Fourth, the hollow screw structure processing accuracy requirements, there are certain difficulties in the process realization.

Summary of the invention

The technical problem to be solved by the present invention is to provide a compact and lightweight intelligent electric drive cylinder device for the above-mentioned state of the art.

Still another technical problem to be solved by the present invention is to provide an intelligent electric drive cylinder device with low noise for the above-mentioned state of the art.

Still another technical problem to be solved by the present invention is to provide an intelligent electric drive cylinder device which is easy to manufacture in view of the above state of the art.

The technical solution adopted by the present invention to solve the above technical problem is: an intelligent electric drive cylinder device, characterized in that it comprises

Outer tube

a DC motor disposed in the outer tube and provided with a sensor;

a speed reducer disposed in the outer tube and connected to the power output end of the DC motor;

The cylinder sleeve is movable back and forth relative to the outer tube and comprises a small cylinder sleeve and a large cylinder sleeve. The small cylinder sleeve is located in the middle of the large cylinder sleeve, and an annular region is formed between the outer wall of the small cylinder sleeve and the inner wall of the large cylinder sleeve;

a piston rod, which is hollow to form an inner cavity and has a piston at the front end, the piston rod is sleeved on the small cylinder sleeve, and the piston is located in an annular region between the outer wall of the small cylinder sleeve and the inner wall of the large cylinder sleeve;

a wire sleeve, which is arranged on the inner wall of the aforementioned small cylinder liner:

a multi-head screw having one end connected to the output end of the aforementioned reducer and the other end extending into the small cylinder sleeve and being coupled with the aforementioned wire sleeve;

The positioning sleeve is disposed on the inner wall of the large cylinder liner and can restrict the piston rod from being separated from the large cylinder sleeve.

The fixing of the reducer is selected as follows: the reducer is disposed on a fixed sleeve of the reducer, and the fixed sleeve of the reducer is disposed in the outer tube.

Further, a small O-ring is disposed on the piston.

Further, the piston is provided with a through hole, and the through hole communicates with the air chambers at both ends of the piston.

Further, the outer tube is provided with an outer tube cover, and the ball stud connection member is disposed on the outer tube cover, and the outer tube is provided with a large O-ring.

Further, the piston is provided with a small oil seal, and the positioning sleeve is provided with a large oil seal.

Preferably, the sensor is a magnetic ring rotating bi-directional Hall sensor.

In order to ensure linear movement of the cylinder sleeve relative to the outer tube, the outer wall of the large cylinder sleeve has a cylinder sleeve protrusion. Correspondingly, the outer tube inner wall has an outer tube groove that is in guiding engagement with the cylinder sleeve protrusion.

The front end of the outer tube is provided with a waterproof ring, and the waterproof ring is in close contact with the outer wall of the cylinder liner. In order to prevent rainwater and the outer tube, it will affect the normal operation of the DC motor.

Preferably, the multi-head screw is connected to the speed reducer by a cross pin.

A through hole is formed in the piston, and the through hole communicates with the air chambers at both ends of the piston. When the piston rod is in motion, the piston is subjected to The force to the compressed gas remains substantially constant.

Compared with the prior art, the invention has the advantages that: the hollow piston rod and the matching structure of the large cylinder sleeve and the small cylinder sleeve can drive the multi-head screw completely back and forth in the small cylinder sleeve, and the working area of the piston is a ring shape. The internal pressure space can be fully utilized to make the overall volume smaller and lighter. At the same time, both the driving structure and the supporting structure are arranged inside and outside, which can effectively reduce the overall length and expand the application space; in addition, the multi-head screw and the wire sleeve The rotation fits in a relatively closed space, so the noise generated is greatly reduced. The invention has simple processing technology, can generate different torques to offset the up and down movement gravity of the article, reduce the number of motor watts, and save energy; it can also effectively prevent the cylinder sleeve from rotating, reduce friction and prolong the service life of the cylinder.

The application of the invention is not limited to the lifting and lowering of the tailgate of the automobile, and the structure adopting the gas spring as the lifting support can be replaced by the electric method of the invention, such as the rotation adjustment of the solar panel, the electric lifting of the medical bed and the protective cover of the range hood. Electric opening and closing, etc.

DRAWINGS

FIG. 1 is a schematic view showing the appearance of the embodiment 1 when shortened.

Figure 2 is a cross-sectional view of Figure 1.

Figure 3 is an exploded view of Embodiment 1.

Figure 4 is an enlarged view of a portion of the cylinder liner of Figure 2.

Fig. 5 is a structural schematic view showing the joint portion of the outer tube and the cylinder liner in the first embodiment.

Fig. 6 is a schematic view showing the structure of a driving portion of the embodiment 1.

Fig. 7 is an enlarged cross-sectional view showing the elongation of Example 1.

Figure 8 is a schematic view showing the structure of the cylinder liner in the second embodiment.

detailed description

The invention will be further described in detail below with reference to the embodiments of the drawings.

As shown in FIG. 1 to FIG. 6 , the intelligent electric drive cylinder device in the embodiment can be applied to the lifting and lowering of the tailgate of the automobile, and specifically includes an outer tube 1, a direct current motor 6, a reducer 5, a cylinder liner 2, a piston rod 4, The wire sleeve 31, the multi-head screw 3 and the positioning sleeve 33.

The front end of the outer tube 1 is provided with a waterproof ring 36 which is in close contact with the outer wall of the cylinder liner 2. The outer tube 1 is provided with an outer tube suffocating cover 7 at its end, and the outer tube suffocating cover 7 is provided with an O-ring 71. A ball stud connection member 81 is provided on the outer tube cover 7, and the outer tube cover 7 is provided with a large O-ring.

The DC motor 6 is disposed in the outer tube 1 and is provided with a sensor 61. The DC motor 6 has an external power supply line 62. The sensor 61 in this embodiment is a magnetic ring rotating bidirectional Hall sensor. The speed reducer 5 is disposed in the outer tube 1 and is connected to the power output end of the DC motor 6 at the input end. Specifically, the speed reducer 5 is disposed on the reducer fixing sleeve 34, and the speed reducer is fixed. The sleeve 34 is disposed in the outer tube 1, and the reducer fixing sleeve 34 is provided with an O-ring 35.

The cylinder liner 2 can move back and forth relative to the outer tube 1 and includes a small cylinder sleeve 22 and a large cylinder sleeve 21. The small cylinder sleeve 22 is located in the middle of the large cylinder sleeve 21, and an annular region is formed between the outer wall of the small cylinder sleeve 22 and the inner wall of the large cylinder sleeve 21. The wire sleeve 31 is disposed on the inner wall of the small cylinder liner 22.

The piston rod 4 is hollow to form an inner cavity and the front end forms a piston 41. The piston rod 4 is sleeved on the small cylinder sleeve 22. The piston 41 is located in an annular region between the outer wall of the small cylinder sleeve 22 and the inner wall of the large cylinder sleeve 21, and the piston 41 A small oil seal 43 and a small O-ring 42 are provided.

One end of the multi-head screw 3 is connected to the output end of the speed reducer 5 through the cross pin 51, and the other end extends into the small cylinder sleeve 22 and is coupled with the wire sleeve 31: the positioning sleeve 33 is disposed on the inner wall of the large cylinder sleeve 21 and can restrict the piston rod 4 is separated from the large cylinder sleeve 21, and the positioning sleeve 33 is provided with a large oil seal 32.

The front end of the cylinder liner 2 and the end of the outer tube 1 are respectively provided with a ball stud connection member 81 and a ball stud connection member 82. In order to ensure linear movement of the cylinder liner 2 in the outer tube 1, the outer wall of the large cylinder sleeve 21 has a cylinder sleeve protrusion 23, and correspondingly, the inner wall of the outer tube 1 has an outer tube groove 11 which is in guiding engagement with the cylinder sleeve protrusion 23.

As shown in FIG. 2 and FIG. 7, the working principle: the DC motor 6 drives the multi-head screw 3 to move back and forth through the reducer 5, and the sleeve 31 is fixedly connected with the small cylinder sleeve 22, so that the sleeve 31 drives the cylinder liner 2 to move back and forth as a whole. To achieve lifting. At the same time, the piston rod 4 moves back and forth in the annular region to provide sufficient support.

The sealed cylinder liner 2 can generate a one-way strong thrust. The small cylinder sleeve 22 and the annular region of the large cylinder liner 21 are filled with compressed gas; the multi-head screw rod 3, the wire sleeve 31 and the DC motor 6 form an electric cylinder push rod. Let it move in a straight line; the sensor 61 is used to detect the running condition of the DC motor 6. Specifically, the DC motor 6 rotates one revolution and the Hall emits three or seven (1 to 12) pulse signals, and two Hall elements come out. The signals make the two pulse signals into a quarter phase difference (90 degree phase difference), thereby calculating the number of digital pulses up or down and the lap speed of the motor rotation, reflecting the operating condition and operating position of the device.

The composition of the cylinder liner 2 and the multi-head screw 3, the wire sleeve 31, the sensor 61, and the DC motor 6 allow the product to be extended and shortened to generate two different moments (for example, the torque generated by the elongation is 900 N, and the generated torque is shortened). 200N), this can make the object move up and down to offset the gravity. Originally, a 30W motor is needed. Now, as long as the 15W DC motor 6 can be used, the product can be reduced, energy is saved, and the linear push-cylinder push rod bearing capacity is greatly reduced. In the case of no power, the object can be pushed with less force.

In the second embodiment, the piston 41 in the embodiment is provided with a through hole 411, which communicates with the air chambers at the front and rear ends of the piston 41, so that the piston rod 4 can be in a large pressure difference when moving. The flow in the hole ensures balance, so that the piston 41 is substantially stabilized by the force of the compressed gas, thereby achieving superior performance than the steel spring. For other structures, refer to Example 1.

Claims

An intelligent electric drive cylinder device characterized by

Outer tube (1);

a DC motor (6), disposed in the outer tube (1) and provided with a sensor (61);

The speed reducer (5) is disposed in the outer tube (1) and has an input end connected to the power output end of the DC motor (6);

The cylinder liner (2) is movable back and forth relative to the outer tube (1) and includes a small cylinder sleeve (22) and a large cylinder sleeve (21). The small cylinder sleeve (22) is located in the middle of the large cylinder sleeve (21). An annular region is formed between the outer wall of the small cylinder liner (22) and the inner wall of the large cylinder liner (21);

The piston rod (4) is hollow to form a cavity and a piston (41) is formed at the front end. The piston rod (4) is sleeved on the small cylinder liner (22), and the piston (41) is located in the small cylinder sleeve ( 22) in the annular region between the outer wall and the inner wall of the large cylinder liner (21);

a wire sleeve (31) disposed on the inner wall of the small cylinder liner (22);

a multi-head screw (3) having one end connected to the output end of the aforementioned reducer (5) and the other end extending into the small cylinder liner (22) and coupled with the aforementioned wire sleeve (31):

The positioning sleeve (33) is disposed on the inner wall of the large cylinder liner (21) and can restrict the piston rod (4) from being separated from the large cylinder sleeve (21).
The intelligent electric drive cylinder device according to claim 1, wherein said reducer (5) is disposed on a reducer fixing sleeve (34), and the reducer fixing sleeve (34) is disposed on the outer tube. (1) inside.
The intelligent electric drive cylinder device according to claim 2, characterized in that the piston (41) is provided with a small O-ring (42).
The intelligent electric drive cylinder device according to claim 1, wherein the piston (41) is provided with a through hole (411), and the through hole (411) communicates with the air chambers at both ends of the piston (41).
The intelligent electric drive cylinder device according to claim 4, wherein an outer tube (7) is provided at an end of the outer tube (1), and the ball stud connection member (81) is disposed at The outer tube is covered by a cover (7), and the outer tube has a large O-ring on the cover (7).
The intelligent electric drive cylinder device according to claim 1, characterized in that the piston (41) is provided with a small oil seal (43), and the positioning sleeve (33) is provided with a large oil seal (32).
The intelligent electric drive cylinder device according to claim 1, wherein said sensor (61) is a magnetic ring rotating bidirectional Hall sensor.
The intelligent electric drive cylinder device according to claim 1, wherein the outer wall of the large cylinder sleeve (21) has a cylinder sleeve protrusion (23), and correspondingly, the inner wall of the outer tube (1) has a cylinder liner The male body (23) is guided to the mating outer tube groove (11).
The intelligent electric drive cylinder device according to claim 1, characterized in that the front end of the outer tube (1) is provided with a waterproof ring (36) which is in close contact with the outer wall of the cylinder liner (2).
The intelligent electric drive cylinder device according to claim 1, characterized in that the multi-head screw (3) is connected to the speed reducer (5) via a cross pin (51).