Linear actuator

Abstract

This utility model discloses a linear actuator, in which an actuation component is disposed outside a housing and connected to one end of a transmission component extending out of the housing. Simultaneously, an opening facing the housing is provided on the actuation component to form a mounting space, and a mounting hole facing the mounting space is provided on the housing. A displacement detection component is partially disposed in the mounting space and partially disposed within the mounting hole. When the drive component drives the actuation component to perform linear motion via the transmission component, the portion of the displacement detection component disposed in the mounting space moves accordingly, thereby accurately detecting the linear displacement of the actuation component. The mounting space on the actuation component and the mounting hole on the housing are located on mating sides, thus providing good dustproof and protective effects for the displacement detection component. Furthermore, the linear actuator has a simple structure and low production cost.

Description

Technical Field

[0001] This utility model relates to the field of automation equipment, and in particular to a linear actuator that can realize linear displacement detection and has a good dust protection effect on the linear displacement detection structure. Background Technology

[0002] A linear actuator is a modular product that integrates a servo motor and a lead screw, used to convert the rotary motion of a servo motor into linear motion. Currently, linear actuators on the market are classified into two main categories: one category lacks linear displacement detection capabilities, making accurate linear displacement detection impossible; the other category, while equipped with a linear displacement detection structure, suffers from poor dust protection for this structure, or its dust protection structure is complex and costly. Utility Model Content

[0003] The technical solution of this utility model is as follows: a linear actuator is provided, comprising a housing, a drive assembly, a transmission assembly, an execution assembly, and a displacement detection assembly; wherein, the drive assembly is disposed within the housing, the transmission assembly is connected to the output end of the drive assembly, the execution assembly is located outside the housing and is connected to the transmission assembly, and the drive assembly drives the execution assembly to move linearly through the transmission assembly; the execution assembly has an opening facing the housing, the housing has a mounting hole facing the mounting space, the displacement detection assembly is partially disposed in the mounting space and partially disposed in the mounting hole, and the displacement detection assembly is used to detect the displacement of the execution assembly relative to the housing.

[0004] Preferably, the displacement detection assembly includes a measured element and a detection element. The measured element is disposed within the mounting space and connected to the actuating component. The detection element is disposed within the mounting hole, and at least partially extends out of the housing to engage with the measured element. The linear displacement of the actuating component is accurately detected through the engagement of the measured element and the detection element. Installing both elements in the mounting space and mounting hole on the mating sides of the actuating component and housing respectively provides good protection and dustproofing.

[0005] Preferably, a first mounting groove is provided on one side of the mounting space, the component under test is fixed in the first mounting groove, and the detection element extends into the mounting space to cooperate with the component under test, thereby improving the compactness of the structure and the accuracy of the installation positioning.

[0006] Preferably, a second mounting groove is provided at one end of the mounting space corresponding to the position of the first mounting groove. The second mounting groove is connected to the first mounting groove and is used to provide clearance space for the detection element.

[0007] Preferably, the actuating component includes a top plate, a bottom plate, and a side plate connected between the two, wherein the top plate, the bottom plate, and the side plate together enclose the mounting space. Assembling the actuating component using multiple components facilitates production assembly and helps reduce production costs.

[0008] Preferably, the linear actuator further includes a sliding assembly, which is connected to the actuator and the housing respectively. The sliding assembly is at least partially located within the mounting space, thereby ensuring the compactness and rationality of the structure.

[0009] Preferably, the sliding assembly includes a guide rail, a slider, and an adapter block. The guide rail is fixed within the mounting space, the slider is slidably connected to the guide rail, one side of the adapter block is connected to the slider, and the other side of the adapter block protrudes from the mounting space and is connected to the housing. This makes the installation of the sliding assembly more reasonable and the structure more compact.

[0010] Preferably, the installation space is further provided with an embedding groove, the guide rail is fixed in the embedding groove, and the inner sidewall of the embedding groove can limit the stroke of the adapter block, thereby simplifying the structure and further improving the compactness of the structure.

[0011] Preferably, the drive assembly includes a stator and a rotating shaft. The stator is fixed inside the housing and rotates in cooperation with the rotating shaft. The stator is used to drive the rotating shaft to rotate.

[0012] Preferably, the transmission assembly includes a lead screw and a nut, the nut being fixed inside the rotating shaft, the lead screw being connected to the nut, and the lead screw also extending out of the housing to connect to the actuating assembly. The rotating shaft rotates under the drive of the stator, thereby driving the nut to rotate, and the lead screw moves linearly under the drive of the nut, thereby driving the actuating assembly to move linearly.

[0013] Preferably, a sealing assembly is also provided between the rotating shaft and the housing, and the housing, the sealing assembly, the rotating shaft and the nut are all provided with oil passages and connected in sequence, thereby realizing the lubrication of the nut.

[0014] Preferably, the housing is provided with an oil nozzle that communicates with the oil passage, and the oil nozzle, the sealing assembly and the nut are arranged radially along the lead screw, thereby making the oil passage from the oil nozzle to the nut shorter, easier to process and lower in cost.

[0015] Compared with the prior art, the linear actuator of this utility model has an actuation component set outside the housing and connected to the end of the transmission component that extends out of the housing. The actuation component has an opening facing the housing, and the housing has a mounting hole facing the mounting space. The displacement detection component is partially disposed in the mounting space and partially in the mounting hole. When the drive component drives the actuation component to perform linear motion through the transmission component, the portion of the displacement detection component disposed in the mounting space moves accordingly, thereby accurately detecting the linear displacement of the actuation component. The mounting space on the actuation component and the mounting hole on the housing are located on matching sides, thus providing good dustproof and protective effects for the displacement detection component. Furthermore, the linear actuator has a simple overall structure and low production cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the linear actuator of this utility model.

[0017] Figure 2 yes Figure 1 The exploded diagram.

[0018] Figure 3 yes Figure 2 A structural diagram from another angle.

[0019] Figure 4 yes Figure 2 A structural schematic diagram of the actuator and sliding transmission assembly from another angle.

[0020] Figure 5 yes Figure 4 A structural diagram from another angle.

[0021] Figure 6 yes Figure 4 The exploded diagram.

[0022] Figure 7 yes Figure 3 A schematic diagram of the middle shell from another angle.

[0023] Figure 8 yes Figure 1 A sectional view.

[0024] Figure 9 yes Figure 1 Another sectional view. Detailed Implementation

[0025] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which similar element reference numerals represent similar elements. It should be noted that the directional descriptions involved in the present invention, such as up, down, left, right, front, and back, indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the technical solutions of this application or / and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first," "second," etc., described are only used to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0026] First combine Figures 1-9 As shown, in one embodiment of this utility model, the provided linear actuator 100 includes a housing 110, a drive assembly 120, a transmission assembly 130, an actuation assembly 140, and a displacement detection assembly 150. The actuation assembly 140 is disposed outside the housing 110. The drive assembly 120 is disposed inside the housing 110. The transmission assembly 130 is connected to the output end of the drive assembly 120, and one end of the transmission assembly 130 extends outside the housing 110 and is connected to the actuation assembly 140. The drive assembly 120 drives the actuation assembly 140 to move linearly through the transmission assembly 130. In this embodiment, the actuation assembly 140 has an opening facing the housing 110 (see [reference needed]). Figure 2 The housing 110 has a mounting hole 111 facing the mounting space 141 (see) Figure 3 The displacement detection component 150 is partially disposed in the mounting space 141, and the displacement detection component 150 is partially disposed in the mounting hole 111. When the actuating component 140 is assembled with the housing 110, the opening surface of the actuating component 140 is connected to the side of the housing 110 with the mounting hole 111 (see...). Figure 1 During the process of the drive assembly 120 driving the execution assembly 140 to move linearly through the transmission assembly 130, the displacement detection assembly 150 detects the displacement of the execution assembly 140 relative to the housing 110, thereby achieving accurate detection of linear displacement. The installation space 141 and the installation hole 111 provide good dustproof and protective effects for the displacement detection assembly 150.

[0027] In this application, the structure of the housing 110 is a conventional structure in the art and will not be described in detail.

[0028] The following is combined Figure 3 , Figure 9As shown, the mounting hole 111 connects to the interior of the housing 110. A portion of the displacement detection assembly 150 is installed inside the housing 110 to make electrical connection with the circuit board inside the housing 110, and another portion of the displacement detection assembly 150 extends out of the housing 110 through the mounting hole 111 to cooperate with the portion of the displacement detection assembly 150 disposed in the mounting space 141.

[0029] Of course, the displacement detection component 150 is not limited to the aforementioned method of achieving electrical connection. For example, in other embodiments, the electrical connection wire can extend into the mounting hole 111 and be electrically connected to the displacement detection component 150, or the electrical connection to the outside can be achieved through a port on the housing 110.

[0030] The following is combined Figures 2-9 As shown, in one embodiment of this utility model, the displacement detection assembly 150 includes a measured element 151 and a detection element 152. The measured element 151 is disposed within the mounting space 141 and mounted on the actuating assembly 140, allowing the measured element 151 to move with the actuating assembly 140. The detection element 152 is disposed within the mounting hole 111, with one portion extending out of the housing 110 to engage with the measured element 151, and the other portion located inside the housing 110 for electrical connection with the circuit board within the housing 110 (see...). Figure 9 The linear displacement of the actuator 140 is accurately detected by the cooperation of the measured element 151 and the detection element 152. Installing both elements in the mounting space 141 and the mounting hole 111 respectively provides good protection and dustproofing. In other embodiments, the detection element 152 may extend completely out of the housing 110, but this is not a limitation.

[0031] Combination Figures 4-6 As shown, in one embodiment of this utility model, a first mounting groove 143 is provided on one side of the mounting space 141. The first mounting groove 143 extends along the moving direction of the actuating component 140. Simultaneously, a second mounting groove 144 is provided at one end of the actuating component 140 corresponding to the first mounting groove 143, and the second mounting groove 144 communicates with the first mounting groove 143. The measured element 151 is fixed within the first mounting groove 143, allowing the measured element 151 to extend along the moving direction of the actuating component 140. Combined with... Figure 9 As shown, after the actuator 140 is installed in the housing 110, the detection element 152 extends into the mounting space 141 to cooperate with the measured element 151, thereby improving the compactness of the structure and the accuracy of installation positioning. The second mounting groove 144 provides clearance space for the detection element 152, preventing the actuator 140 from touching the detection element 152 during movement, while ensuring the accuracy of displacement detection.

[0032] Continue to combine Figures 2-9 As shown, in a preferred embodiment, the measured element 151 is a magnetic scale, which is installed in the first mounting groove 143 of the actuator 140, extending along one side of the actuator 140. The detection element 152 is a reading head, which is installed in the mounting hole 111 of the housing 110, extending out of the housing 110 and into the mounting space 141, so that the reading head can cooperate with the magnetic scale to read the data on the magnetic scale. Specifically, as the magnetic scale moves with the actuator 140, the reading head can read the data on the magnetic scale to achieve accurate displacement detection.

[0033] Understandably, the measured element 151 and the detection element 152 are not limited to the matching magnetic scale and reading head. It is also feasible to use other detection elements to achieve displacement detection.

[0034] The following is combined Figures 2-6 As shown, in one embodiment of this utility model, the actuating component 140 includes a top plate 140a, a bottom plate 140b, and a side plate 140c connected between the two, which together form an installation space 141. Using multiple components to assemble the actuating component 140 facilitates production assembly and helps reduce production costs. When the actuating component 140 is mounted on the housing 110, the top plate 140a of the actuating component 140 is connected to the transmission component 130, as detailed below.

[0035] More specifically, the mounting space 141 is formed by a downward recess on one side of the side plate 140c, and the mounting space 141 extends along the length of the side plate 140c. A first mounting groove 143 is located on one side of the side plate 140c and communicates with the mounting space 141, specifically at the end of the side plate 140c near the bottom plate 140b. A second mounting groove 144 is formed on the bottom plate 140b and communicates with the first mounting groove 143. The measured element 151 (magnetic scale) is located in the first mounting groove 143 and fixed to the side plate 140c. When the actuator 140 is mounted on the housing 110, the opening of the mounting space 141 fits against the side of the housing 110 with the mounting hole 111, allowing the detection element 152 (reading head) to extend into the mounting space 141 to cooperate with the measured element 151 (magnetic scale).

[0036] Continue to combine Figures 4-6 As shown, in one embodiment of the present invention, an embedding groove 142 is also provided in the installation space 141. The embedding groove 142 is specifically recessed in the side plate 140c and extends along the length direction of the side plate 140c. The embedding groove 142 is used to install the sliding component 160, as detailed below.

[0037] The following is combined Figure 2 , Figure 4-6 As shown, in one embodiment of the present invention, the linear actuator 100 further includes a sliding component 160. The sliding component 160 is at least partially located within the mounting space 141, and the actuator 140 and the housing 110 are respectively connected to the sliding component 160. The sliding component 160 is used to guide the linear movement of the actuator 140. The structural arrangement of partially accommodating the actuator 140 within the mounting space 141 makes the overall structure of the linear actuator 100 more compact and reasonable.

[0038] The following is combined Figures 4-6 , Figure 8 As shown, in this embodiment, the sliding assembly 160 includes a guide rail 161, a slider 162, and an adapter block 163. The guide rail 161 is fixed within the mounting groove 142, the slider 162 is slidably connected to the guide rail 161, one side of the adapter block 163 is connected to the slider 162, and the other side of the adapter block 163 protrudes from the mounting space 141 and is connected to the housing 110 (see...). Figure 8 This makes the installation of the sliding component 160 more reasonable, thereby making the structure more compact. During the linear movement of the drive component 120 driving the execution component 140, the guide rail 161 slides along the slider 162, and the inner sidewall of the embedded groove 142 can cooperate with the adapter block 163 to form a stroke limit, thereby simplifying the structure and further improving the compactness of the structure.

[0039] The following is combined Figures 8-9 As shown, in one embodiment of this utility model, the drive assembly 120 includes a stator 121, a rotor 122, and a rotating shaft 123. The stator 121 is fixed within the housing 110, the rotor 122 is disposed within the stator 121 and rotatably engages with the stator 121, and the rotating shaft 123 is fixed within the rotor 122 and has a hollow structure. The rotor 122 can rotate under the drive of the stator 121, thereby driving the rotating shaft 123 to rotate synchronously.

[0040] In this embodiment, the transmission assembly 130 includes a nut 131 and a lead screw 132. The nut 131 is fixed inside the rotating shaft 123, one end of the lead screw 132 is connected to the nut 131, and the other end of the lead screw 132 extends out of the housing 110 and is connected to the top plate 140a of the actuation assembly 140 (see...). Figure 8 During the process of the stator 121 driving the rotating shaft 123 to rotate, the rotating shaft 123 drives the nut 131 to rotate synchronously, and the lead screw 132 moves linearly under the drive of the nut 131, thereby driving the actuator 140 to move linearly.

[0041] Continue to combine Figures 8-9As shown, in one embodiment of this utility model, a sealing assembly 170 is further provided between the rotating shaft 123 and the housing 110. Specifically, the sealing assembly 170 includes at least an outer spacer 171 and two bearings 172. The outer spacer 171 is sleeved on the outside of the rotating shaft 123 and positioned at the corresponding nut 131, that is, the outer spacer 171 and the nut 131 are arranged radially correspondingly along the rotating shaft 123. The two bearings 172 are sleeved on the outside of the rotating shaft 123 and respectively abut against both ends of the outer spacer 171.

[0042] Continue to combine Figures 8-9 As shown, in this embodiment, the housing 110, sealing assembly 170, rotating shaft 123, and nut 131 are all provided with oil passages 173 and are connected in sequence. The oil passages 173 are used to lubricate the nut 131. More specifically, the space between the outer wall of the outer spacer 171 and the housing 110 forms part of the oil passage 173, and the space between the inner wall of the outer spacer 171 and the bearings 172 at both ends forms another part of the oil passage 173. The outer spacer 171 has through holes that connect the inner and outer parts of the oil passage 173. Figure 9 As shown. Simultaneously, both the rotating shaft 123 and the nut 131 have through holes connecting to the oil passage 173, see... Figure 8 As shown. This arrangement of the oil passage 173 shortens the oil passage 173, thus facilitating processing.

[0043] In a preferred embodiment, the housing 110 is provided with an oil nozzle 112 that communicates with the oil passage 173. The oil nozzle 112 is positioned between the two bearings 172, so that the oil nozzle 112, the sealing assembly 170 and the nut 131 are arranged radially along the lead screw 132. This makes the oil passage 173 between the oil nozzle 112 and the nut 131 shorter, easier to process and lower in cost.

[0044] Understandably, the oil passage 173 is not limited to the arrangement shown in this embodiment, and other structural arrangements are also possible.

[0045] Combined again Figure 1-3 , Figure 8 As shown, in one embodiment of this utility model, the linear actuator 100 further includes a circuit board 180 and a dust cover 190. The circuit board 180 is installed inside the housing 110 and located at the rear end of the drive assembly 120. The circuit board 180 is arranged perpendicular to the axial direction of the drive assembly 120, thereby making the internal structure of the housing 110 more compact. The dust cover 190 is fitted onto the end of the transmission assembly 130 that extends outside the housing 110, and both ends of the dust cover 190 are respectively connected to the top plate 140a of the housing 110 and the actuator 140, thus providing dust protection for the transmission assembly 130.

[0046] Combined again Figures 1-9As shown, when the linear actuator 100 of this utility model is in use, the drive assembly 120 drives the lead screw 132 of the transmission assembly 130 to move linearly, and the lead screw 132 drives the actuation assembly 140 to move linearly. During this process, the guide rail 161 mounted on the actuation assembly 140 slides along the slider 162 mounted on the housing 110. During the sliding process, the stroke is limited by the cooperation between the inner sidewall of the embedded groove 142 and the adapter block 163.

[0047] During the linear motion of the execution component 140, the measured element 151 installed in the installation space 141 moves synchronously. The measured element 151 cooperates with the detection element 152 extending into the installation space 141. The detection element 152 reads the measured element 151 to detect the displacement of the execution component 140 and can achieve accurate displacement detection.

[0048] In summary, the linear actuator 100 of this utility model has an actuator component 140 disposed outside the housing 110, and the actuator component 140 is connected to one end of the transmission component 130 extending out of the housing 110. The actuator component 140 has a mounting space 141 with an opening facing the housing 110, and the housing 110 has a mounting hole 111 facing the mounting space 141. A displacement detection component 150 is partially disposed in the mounting space 141 and partially disposed in the mounting hole 111. When the drive component 120 passes through the transmission... When the moving component 130 drives the actuating component 140 to make linear motion, the part of the displacement detection component 150 set in the installation space 141 moves accordingly. The displacement detection component 150 accurately detects the linear displacement of the actuating component 140. The installation space 141 on the actuating component 140 and the mounting hole 111 on the housing 110 are located on the side where they fit together, thus providing good dustproof and protective effects for the displacement detection component 150. In addition, the linear actuator 100 has a simple overall structure and low production cost.

[0049] The structures of the other parts of the linear actuator 100 involved in this application are conventional structures well known to those skilled in the art, and will not be described in detail.

[0050] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A linear actuator, characterized in that, The device includes a housing, a drive assembly, a transmission assembly, an execution assembly, and a displacement detection assembly. The drive assembly is disposed inside the housing, the transmission assembly is connected to the output end of the drive assembly, and the execution assembly is located outside the housing and is connected to the transmission assembly. The drive assembly drives the execution assembly to move linearly through the transmission assembly. The actuator has an opening facing the housing, and the housing has a mounting hole facing the mounting space. The displacement detection component is partially disposed in the mounting space and partially disposed in the mounting hole. The displacement detection component is used to detect the displacement of the actuator relative to the housing.

2. The linear actuator as described in claim 1, characterized in that, The displacement detection assembly includes a measured element and a detection element. The measured element is disposed within the mounting space and connected to the execution assembly. The detection element is disposed within the mounting hole and extends at least partially out of the housing to cooperate with the measured element.

3. The linear actuator as described in claim 2, characterized in that, A first mounting groove is provided on one side of the installation space. The component under test is fixed in the first mounting groove, and the detection element extends into the installation space to cooperate with the component under test.

4. The linear actuator as described in claim 3, characterized in that, A second mounting slot is provided at one end of the mounting space corresponding to the position of the first mounting slot, and the second mounting slot is used to provide clearance space for the detection element.

5. The linear actuator as described in any one of claims 1-4, characterized in that, The execution component includes a top plate, a bottom plate, and a side plate connected between the two, the top plate, the bottom plate, and the side plate together forming the installation space.

6. The linear actuator according to any one of claims 1-4, characterized in that, The linear actuator further includes a sliding assembly, which is connected to the housing and the actuator respectively. The sliding assembly is at least partially located within the mounting space.

7. The linear actuator as described in claim 6, characterized in that, The sliding assembly includes a guide rail, a slider, and an adapter block. The guide rail is fixed within the installation space, the slider is slidably connected to the guide rail, one side of the adapter block is connected to the slider, and the other side of the adapter block is connected to the housing.

8. The linear actuator as described in claim 7, characterized in that, The installation space is also provided with an embedding groove, the guide rail is fixed in the embedding groove, and the inner sidewall of the embedding groove can limit the travel of the adapter block.

9. The linear actuator according to any one of claims 1-4, characterized in that, The drive assembly includes a stator and a rotating shaft, and the transmission assembly includes a lead screw and a nut. The nut is fixed inside the rotating shaft, and the lead screw is connected to the nut. The rotating shaft can rotate under the drive of the stator and drive the nut to rotate. The lead screw moves linearly under the drive of the nut. A sealing assembly is also provided between the rotating shaft and the housing. The housing, the sealing assembly, the rotating shaft and the nut are all provided with oil passages and are connected in sequence.

10. The linear actuator as claimed in claim 9, characterized in that, The housing is provided with an oil nozzle that communicates with the oil passage, and the oil nozzle, the sealing assembly and the nut are arranged radially along the lead screw.

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