High-thrust electric cylinder

Abstract

According to the high-thrust electric cylinder, the gear transmission mechanism is arranged in the reduction gearbox shell of the electric cylinder, the gear transmission mechanism is connected with the output end of the driving motor stretching into the reduction gearbox shell and the stretching-in end of the thrust screw, and power is transmitted in the electric cylinder through the gear transmission mechanism; therefore, the gear transmission mechanism is used for replacing an original synchronous belt transmission mechanism, the structural rigidity and reliability are greatly improved, the service life is greatly prolonged, a synchronous wheel tensioning device does not need to be arranged in the electric cylinder, and the size of the electric cylinder is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the mechanical technical field, and in particular, relates to a large-thrust electric cylinder. BACKGROUND

[0002] At present, the electric cylinder generally adopts synchronous pulley to transmit power, and the synchronous pulley usually uses a belt for transmission. After the electric cylinder is used for a period of time, the belt of the synchronous pulley is prone to wear and aging, so that the belt of the synchronous pulley needs to be maintained and replaced, so that the electric cylinder needs to be regularly maintained. Moreover, a synchronous pulley tensioning device matched with the synchronous pulley needs to be additionally arranged on the electric cylinder, so that the structure of the electric cylinder is relatively complex. CONTENT OF THE UTILITY MODEL

[0003] To solve the above problems, the purpose of the embodiment of the present application is to provide a large-thrust electric cylinder.

[0004] In a first aspect, the embodiment of the present application provides a large-thrust electric cylinder, comprising: a first shell, a reduction box shell, a second shell, an end cover, a thrust screw, a thrust bearing assembly, a guide block, a guide rod, a gear transmission mechanism, a driving motor, a circuit board, a position sensor, an output shaft and a fixing block.

[0005] The first shell, the reduction box shell and the second shell are sequentially connected to form an electric cylinder shell.

[0006] The end of the first shell away from the reduction box shell is provided with the end cover.

[0007] One end of the thrust bearing assembly abuts against the inside of the first shell, and the other end abuts against the end of the reduction box shell. The thrust bearing assembly is sleeved on the thrust screw, and the thrust screw is rotationally arranged in the first shell through the thrust bearing assembly.

[0008] One end of the thrust screw extends into the reduction box shell, and the other end of the thrust screw is threadedly connected with one end of the output shaft, and the other end of the output shaft penetrates through the end cover.

[0009] The guide block is arranged in the first shell and fixedly sleeved on the output shaft.

[0010] The fixing block is arranged between the reduction box shell and the guide block, and a mounting hole is formed in the end face of the fixing block facing the guide block.

[0011] One end of the guide rod is arranged in the mounting hole, and the other end of the guide rod penetrates through the guide block and is fixedly connected with the end cover. The guide block can do reciprocating linear motion along the extension direction of the guide rod.

[0012] The driving motor is arranged in the second shell, the output end of the driving motor extends into the reduction box shell, the gear transmission mechanism is arranged in the reduction box shell, and the gear transmission mechanism is connected with the output end of the driving motor extending into the reduction box shell and the extending end of the thrust screw, respectively.

[0013] The circuit board is arranged on the inner wall of the electric cylinder housing away from the guide rod, and the position sensor is arranged between the circuit board and the guide block.

[0014] In the scheme provided by the first aspect of the embodiment of the application, the gear transmission mechanism is arranged in the reduction gearbox housing of the electric cylinder, the gear transmission mechanism is connected with the output end of the driving motor extending into the reduction gearbox housing and the extending end of the push screw respectively, power is transmitted in the electric cylinder by using the gear transmission mechanism, and compared with the mode of adding a synchronous pulley tensioning device matched with the synchronous pulley on the electric cylinder, the gear transmission mechanism is used to replace the original synchronous belt transmission mechanism, the structure rigidity, reliability and service life are greatly improved, and the synchronous pulley tensioning device does not need to be arranged in the electric cylinder, so that the volume of the electric cylinder is reduced.

[0015] In order to make the above objectives, characteristics and advantages of the application more apparent, clear and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are referred to for detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0017] Figure 1 A cross-sectional structure schematic diagram of a large-thrust electric cylinder provided by an embodiment of the application is shown;

[0018] Figure 2 A partial three-dimensional structure schematic diagram of the large-thrust electric cylinder provided by the embodiment of the application is shown;

[0019] Figure 3 A three-dimensional structure schematic diagram of the reduction gearbox housing of the large-thrust electric cylinder provided by the embodiment of the application is shown;

[0020] Figure 4 A three-dimensional structure schematic diagram of the first housing of the large-thrust electric cylinder provided by the embodiment of the application is shown;

[0021] Figure 5 A three-dimensional structure schematic diagram of the large-thrust electric cylinder provided by the embodiment of the application is shown; Figure 1 A partial enlarged structure schematic diagram at A is shown. DETAILED DESCRIPTION

[0022] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0024] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] At present, the electric cylinder generally uses synchronous pulley to transmit power, and the synchronous pulley usually uses belt to drive. After the electric cylinder is used for a period of time, the belt of the synchronous pulley is prone to wear and aging, so the belt of the synchronous pulley needs to be maintained and replaced, so that the electric cylinder needs to be regularly maintained. Moreover, a synchronous pulley tensioning device matched with the synchronous pulley needs to be additionally arranged on the electric cylinder, resulting in that the structure of the electric cylinder is relatively complex.

[0026] Based on this, the following embodiments of the present application propose a large-thrust electric cylinder. A gear transmission mechanism is arranged in the reduction box shell of the electric cylinder. The gear transmission mechanism is connected with the output end of the driving motor extending into the reduction box shell and the extending end of the thrust screw, respectively. The gear transmission mechanism is used to transmit power in the electric cylinder, so that the original synchronous belt transmission mechanism is replaced by the gear transmission mechanism, which greatly improves the structure rigidity, reliability and service life, and the synchronous pulley tensioning device does not need to be arranged in the electric cylinder, thereby reducing the volume of the electric cylinder.

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and embodiments.

[0028] Embodiment

[0029] Referring to Figure 1 As shown in the cross-sectional structural schematic view of the large-thrust electric cylinder, the embodiment provides a large-thrust electric cylinder, which comprises a first shell 1, a reduction box shell 2, a second shell 3, an end cover 4, a thrust screw 5, a thrust bearing assembly 6, a guide block 7, a guide rod 8, a gear transmission mechanism 9, a driving motor 10, a circuit board 11, a position sensor 12, an output shaft 13 and a fixing block 101.

[0030] The first shell 1, the reduction box shell 2 and the second shell 3 are sequentially connected to form an electric cylinder shell.

[0031] The first shell 1 is provided with the end cover 4 at an end away from the reduction box shell 2.

[0032] One end of the thrust bearing assembly 6 abuts against the inside of the first shell 1, and the other end abuts against the end of the reduction box shell 2. The thrust bearing assembly 6 is sleeved on the thrust screw 5, and the thrust screw 5 is rotationally arranged in the first shell 1 through the thrust bearing assembly 6.

[0033] One end of the thrust screw 5 extends into the reduction box shell 2, and the other end of the thrust screw 5 is threadedly connected with one end of the output shaft 13, and the other end of the output shaft 13 penetrates through the end cover 4.

[0034] The guide block 7 is arranged in the first shell 1 and fixedly sleeved on the output shaft 13.

[0035] The fixing block 101 is arranged between the reduction box shell 2 and the guide block 7, and a mounting hole 1011 is formed in an end face of the fixing block 101 facing the guide block 7.

[0036] One end of the guide rod 8 is arranged in the mounting hole 1011, and the other end penetrates through the guide block 7 and is fixedly connected with the end cover 4. The guide block 7 can make reciprocating linear motion along the extension direction of the guide rod 8. The axis of the guide rod 8 is parallel to the axis of the output shaft 13.

[0037] The driving motor 10 is arranged in the second shell 3, and the output end of the driving motor 10 extends into the reduction box shell 2. The gear transmission mechanism 9 is arranged in the reduction box shell 2, and the gear transmission mechanism 9 is connected with the output end of the driving motor 10 extending into the reduction box shell 2 and the extending end of the thrust screw 5, respectively.

[0038] The circuit board 11 is arranged on the inner wall of the electric cylinder shell away from the guide rod 8, and the position sensor 12 is arranged between the circuit board 11 and the guide block 7.

[0039] Specifically, referring to Figure 2The gear transmission mechanism 9 comprises: a driving gear 901, a first double gear 902, a second double gear 903, a driven gear 904, a first gear pin shaft 905 and a second gear pin shaft 906.

[0040] The driving gear 901 is fixedly connected with the output end of the driving motor 10.

[0041] The two ends of the first gear pin shaft 905 and the two ends of the second gear pin shaft 906 are respectively rotationally connected with the reduction box shell 2, the first double gear 902 is coaxial with and fixedly connected with the first gear pin shaft 905, the second double gear 903 is coaxial with and fixedly connected with the second gear pin shaft 906, the first double gear 902 and the second double gear 903 respectively comprise two gears of different sizes arranged coaxially, the driving gear 901 is engaged with the large gear of the first double gear 902, the small gear of the first double gear 902 is engaged with the large gear of the second double gear 903, the small gear of the second double gear 903 is engaged with the driven gear 904, and the driven gear 904 is fixedly connected with the end of the thrust screw 5 extending into the reduction box shell 2. In an embodiment, the driving gear 901, the first double gear 902, the second double gear 903 and the driven gear 904 are all straight gears or helical gears.

[0042] As shown in Figure 1 The position sensor 12 comprises: a grid bar 1201 and a sensing chip 1202.

[0043] The grid bar 1201 is installed on the end surface of the guide block 7 facing the circuit board 11, and the sensing chip 1202 is fixed on the end surface of the circuit board 11 facing the grid bar 1201.

[0044] The installed sensing chip 1202 is arranged opposite to the installed grid bar 1201.

[0045] Under the action of the output shaft 13, the guide block 7 performing linear reciprocating motion along the length direction of the guide rod 8 drives the grid bar 1201 to move synchronously, and the relative position of the sensing chip 1202 and the grid bar 1201 will change. In this process, the sensing chip 1202 will read the displacement information of the grid bar 1201, so as to determine the displacement distance of the output shaft 13. The grid bar 1201 can be a magnetic grid bar or an optical grid bar.

[0046] Referring to Figure 3 the schematic diagram of the reduction box shell of the large thrust cylinder, and referring to Figure 4 the schematic diagram of the first shell of the large thrust cylinder, the large thrust cylinder proposed in the embodiment further comprises: a limiting protrusion 201 and a limiting groove 1012.

[0047] The end face of the reduction gearbox shell 2 towards the first shell 1 is provided with a limiting protrusion 201, and the end face of the fixing block 101 towards the reduction gearbox shell 2 is provided with a limiting groove 1012, and the limiting protrusion 201 extends into the limiting groove 1012.

[0048] When the electric cylinder is running, the reduction gearbox shell 2 and the first shell 1 will rotate relative to the thrust screw 5 due to the power transmission of the gear transmission mechanism 9, so that the connecting bolt between the reduction gearbox shell 2 and the first shell 1 will be subjected to shear force for a long time and will be bent or even broken. The arrangement can avoid the relative rotation of the reduction gearbox shell 2 and the first shell 1, so that the electric cylinder runs more stably and the failure rate is reduced.

[0049] In the large-thrust electric cylinder provided in the embodiment, referring to the partial enlarged structural schematic view at A shown in the figure, Figure 5 the thrust screw 5 comprises a threaded output portion 501, a connecting sleeve 502 and a rotating input portion 503. Figure 1

[0050] The threaded output portion 501, the connecting sleeve 502 and the rotating input portion 503 are coaxially arranged, one end of the connecting sleeve 502 is connected with the threaded output portion 501, and the other end of the connecting sleeve 502 is connected with the rotating input portion 503.

[0051] The threaded output portion 501 is threadedly connected with the output shaft 13, the rotating input portion 503 is fixedly connected with the driven gear 904, the connecting sleeve 502 is provided with a bearing limiting ring 5021 in the circumferential direction, the bearing limiting ring 5021 is in rotating contact with the thrust bearing assembly 6 on both sides, and the both sides of the bearing limiting ring 5021 are respectively provided with first ball channels 50211.

[0052] The thrust bearing assembly 6 comprises a bearing seat 601 and a ball 602.

[0053] The end face of the bearing seat 601 towards the ball 602 is provided with a second ball channel 6011, the second ball channel 6011 is oppositely arranged with the first ball channel 50211, and the ball 602 is arranged between the oppositely arranged first ball channel 50211 and the second ball channel 6011; wherein the first ball channel 50211 and the second ball channel 6011 are both groove structures.

[0054] In one embodiment, the two groups of thrust bearing assemblies 6 can bear bidirectional thrust load of the thrust screw 5.

[0055] Further, as shown in the figure, the large-thrust electric cylinder provided in the embodiment further comprises a sliding sleeve 14. Figure 1 The sliding sleeve 14 is arranged between the output shaft 13 and the end cover 4; the sliding sleeve 14 is also arranged between the output shaft 13 and the inner wall of the first shell 1.

[0056] ​​

[0057] The sliding sleeve 14 can support and guide the output shaft 13, reduce the lateral swing of the output shaft 13, i.e. limit the radial position of the output shaft 13, and improve the accuracy of the electric cylinder.

[0058] As shown in the drawings, the large-thrust electric cylinder provided in the embodiment further comprises an elastic component 15. Figure 1

[0059] The elastic component 15 capable of providing pre-tightening force is arranged between the bearing seat 601 of the thrust bearing assembly 6 and the first housing 1.

[0060] Further, the second housing 3 further has a space (not shown in the drawings) for accommodating the electric cylinder cable.

[0061] The working principle of the large-thrust electric cylinder provided in the embodiment is as follows:

[0062] The driving motor 10 drives the driving gear 901 fixedly connected with the output end of the driving motor 10 to rotate, the driving gear 901 rotates and engages with the first double gear 902, and drives the first double gear 902 to rotate, the first double gear 902 drives the second double gear 903 to rotate, and the driven gear 904 rotates under the driving of the second double gear 903, and the driven gear 904 drives the thrust screw 5 to rotate, since the thrust screw 5 is threadedly connected with the output shaft 13 and the output shaft 13 is limited by the guide block 7 and the guide rod 8, the output shaft 13 will move linearly along the axial direction of the thrust screw 5 when the thrust screw 5 rotates; at the same time, the position sensor 12 will work, and the sensing chip 1202 will read the displacement information of the grid 1201, so as to determine the displacement distance of the output shaft 13.

[0063] The large-thrust electric cylinder provided in the embodiment has the following characteristics:

[0064] 1) In the design of the gear transmission mechanism, a multi-stage gear transmission mode is adopted for transmission, the pitch diameter of a single gear is reduced, thereby reducing the overall volume, and the self-locking of the output shaft can be realized by the thread connection between the thrust screw and the output shaft, and the position accuracy and reliability of the output shaft are further improved.

[0065] 2) The gear transmission mechanism utilizes the work of the large and small gears, reduces the rotation speed of the driving motor output through the power input and output of the gear transmission mechanism, improves the torque of the thrust screw, and thus achieves the purpose of increasing the thrust of the output shaft of the electric cylinder.

[0066] 3) Through the design of the limiting protrusion and the limiting groove, the relative rotation between the reduction box housing and the first housing can be avoided, the electric cylinder runs more stably, and the failure rate is reduced.

[0067] ​In summary, the large thrust electric cylinder provided in the embodiment, by setting the gear transmission mechanism in the reduction gearbox shell of the electric cylinder, the gear transmission mechanism is connected with the drive motor output end and the thrust screw extending end respectively, the power is transmitted in the electric cylinder by using the gear transmission mechanism, compared with the related art that the power is transmitted by using the synchronous pulley belt of the electric cylinder, the synchronous pulley belt needs to be maintained and replaced regularly, and the synchronous pulley tensioning device needs to be additionally arranged on the electric cylinder, compared with the above-mentioned mode, the gear transmission mechanism is used to replace the original synchronous belt transmission mechanism, the structure rigidity, reliability and service life are greatly improved, and the synchronous pulley tensioning device does not need to be arranged in the electric cylinder, so that the volume of the electric cylinder is reduced.

[0068] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-thrust electric cylinder, characterized in that, include: The first housing (1), the gearbox housing (2), the second housing (3), the end cover (4), the thrust screw (5), the thrust bearing assembly (6), the guide block (7), the guide rod (8), the gear transmission mechanism (9), the drive motor (10), the circuit board (11), the position sensor (12), the output shaft (13), and the fixing block (101) are connected in sequence to form the electric cylinder housing; the first housing (1), the gearbox housing (2), and the second housing (3) are located away from the gearbox housing (2). An end cap (4) is provided at one end; one end of the thrust bearing assembly (6) abuts against the inside of the first housing (1), and the other end abuts against the end of the gearbox housing (2). The thrust bearing assembly (6) is fitted onto the thrust screw (5), and the thrust screw (5) is rotatably disposed inside the first housing (1) through the thrust bearing assembly (6). One end of the thrust screw (5) extends into the gearbox housing (2), and the other end of the thrust screw (5) is threadedly connected to one end of the output shaft (13), and the other end of the output shaft (13) passes through the end cap (4). The guide block (7) is disposed inside the first housing (1) and fixedly sleeved on the output shaft (13); the fixing block (101) is disposed between the gearbox housing (2) and the guide block (7), and the fixing block (101) has a mounting hole (1011) on the end face of the fixing block (101) facing the guide block (7); one end of the guide rod (8) is disposed in the mounting hole (1011), and the other end passes through the guide block (7) and is fixedly connected to the end cover (4), and the guide block (7) can reciprocate linearly along the extension direction of the guide rod (8); A drive motor (10) is installed inside the housing (3). The output end of the drive motor (10) extends into the gearbox housing (2). A gear transmission mechanism (9) is installed inside the gearbox housing (2). The gear transmission mechanism (9) is connected to the output end of the drive motor (10) extending into the gearbox housing (2) and the extension end of the thrust screw (5). The circuit board (11) is installed on the inner wall of the electric cylinder housing on the side away from the guide rod (8). The position sensor (12) is installed between the circuit board (11) and the guide block (7).

2. The high-thrust electric cylinder according to claim 1, characterized in that, The gear transmission mechanism (9) includes: a driving gear (901), a first double gear (902), a second double gear (903), a driven gear (904), a first gear pin (905), and a second gear pin (906); the driving gear (901) is fixedly connected to the output end of the drive motor (10); the two ends of the first gear pin (905) and the two ends of the second gear pin (906) are respectively rotatably connected to the gearbox housing (2); the first double gear (902) is coaxial with and fixedly connected to the first gear pin (905); the second double gear... (903) is coaxial with and fixedly connected to the second gear pin (906). The first double gear (902) and the second double gear (903) each include two gears of different sizes arranged coaxially. The driving gear (901) meshes with the large gear of the first double gear (902). The small gear of the first double gear (902) meshes with the large gear of the second double gear (903). The small gear of the second double gear (903) meshes with the driven gear (904). The driven gear (904) is fixedly connected to the end of the thrust screw (5) that extends into the gearbox housing (2).

3. The high-thrust electric cylinder according to claim 2, characterized in that, The driving gear (901), the first double gear (902), the second double gear (903), and the driven gear (904) are all spur gears or helical gears.

4. The high-thrust electric cylinder according to claim 1, characterized in that, The position sensor (12) includes a grid strip (1201) and a sensing chip (1202); the grid strip (1201) is mounted on the end face of the guide block (7) facing the circuit board (11), and the sensing chip (1202) is fixed on the end face of the circuit board (11) facing the grid strip (1201); the installed sensing chip (1202) is positioned opposite to the installed grid strip (1201).

5. The high-thrust electric cylinder according to claim 1, characterized in that, Also includes: Limiting protrusion (201) and limiting groove (1012); a limiting protrusion (201) is provided on the end face of the gearbox housing (2) facing the first housing (1), and a limiting groove (1012) is provided on the end face of the fixing block (101) facing the gearbox housing (2), and the limiting protrusion (201) extends into the limiting groove (1012).

6. The high-thrust electric cylinder according to claim 2, characterized in that, The thrust screw (5) includes: a threaded output part (501), a connecting sleeve (502), and a rotation input part (503); the threaded output part (501), the connecting sleeve (502), and the rotation input part (503) are coaxially arranged, one end of the connecting sleeve (502) is connected to the threaded output part (501), and the other end of the connecting sleeve (502) is connected to the rotation input part (503); the threaded output part (501) is threadedly connected to the output shaft (13), and the rotation input part (503) is fixedly connected to the driven gear (904). A bearing limiting ring (5021) is provided circumferentially on the connecting sleeve (502), and the bearing limiting ring (5021) is provided with a bearing limiting ring (5022). 21) The two sides of the bearing limiting ring (5021) are respectively in rotational contact with the thrust bearing assembly (6) and the two sides of the bearing limiting ring (5021) are respectively provided with first ball tracks (50211); the thrust bearing assembly (6) includes: bearing seat (601) and ball (602); the bearing seat (601) is provided with a second ball track (6011) on the end face facing the ball (602), the second ball track (6011) is arranged opposite to the first ball track (50211), and the ball (602) is arranged between the opposite first ball track (50211) and the second ball track (6011); wherein, the first ball track (50211) and the second ball track (6011) are both groove structures.

7. The high-thrust electric cylinder according to claim 1, characterized in that, Also includes: Sliding sleeve (14); The sliding sleeve (14) is disposed between the output shaft (13) and the end cover (4); A sliding sleeve (14) is also disposed between the output shaft (13) and the inner wall of the first housing (1).

8. The high-thrust electric cylinder according to claim 1, characterized in that, Also includes: Elastic component (15); The elastic component (15) capable of providing preload is disposed between the bearing housing (601) of the thrust bearing assembly (6) and the first housing (1).

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