A sliding substructure of an automatic door opening and closing actuator

Abstract

The utility model discloses a sliding substructure of an automatic door opening and closing actuator, including a nut slider, a push rod, a screw and a buffer nut. A threaded through hole is provided on the nut slider, the screw is sleeved in the threaded through hole, the buffer nut and the nut slider are fixed, the inner ring of the buffer nut is provided with a spiral line in the same direction as the threaded through hole, the buffer nut is sleeved on the screw and has an interference fit; the center line of the buffer nut, the center line of the screw and the center line of the threaded through hole are arranged in a colinear manner. The utility model adds a buffer nut, which is fixed to the nut slider and has an interference fit with the screw; and the thread line of the inner ring of the buffer nut is the same as the thread line of the threaded through hole. This means that during the rotation of the screw, the threaded through hole will move and provide sufficient driving force to force the buffer nut to move along with the nut slider. While ensuring that the movement of the nut slider is not affected, the problem of transmission clearance between the screw and the threaded through hole can be eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a sliding substructure of an automatic opening and closing driver of a vehicle door. Background Art

[0002] With the widespread application of intelligent and electric household cars, automatic swing door systems have gradually become products that users often use and experience. As the core component for realizing automatic opening and closing of car doors, the drive actuator can be divided into two structures: inner swing type and outer swing type; among them, the inner swing type drive occupies a smaller space and has a wider range of applications.

[0003] As shown in the patent application number CN202321789965.4, entitled A Door Driving Device and Automobile, the existing inner swing drive actuator generally includes a connecting rod (push rod), a slider (nut slider), a mounting shell and a screw rod. One end of the connecting rod is hinged to the door or the body, and the other end of the connecting rod is hinged to the slider. The slider is threadedly connected to the screw rod and slidably arranged with the mounting shell. The screw rod is rotatably connected in the mounting shell and driven by a driving mechanism. The screw rod rotates, driving the connecting rod to move, and the movement of the connecting rod rotates the door along the hinge point between the door and the body to realize the opening and closing of the door.

[0004] In the above patent, the connection between the slider and the screw rod only has a simple thread guide function. Due to the radial and axial clearances in the threads, the slider and the screw rod are not parallel during use. When the door is opened or closed, the push and pull of the connecting rod causes the slider to move axially, resulting in an empty stroke of the connecting rod, thereby increasing the empty stroke of the door edge. When the door is switched back and forth, the empty stroke of the connecting rod will cause the door to make a "clang" sound.

[0005] To solve the above problems, in the prior art, for example, a patent with patent application number CN202311043076.8 and name of a nut structure for an electric door driving mechanism records a nut structure, in which an elastic component is installed at least at one of the upper and lower end faces of the lead screw nut. When the lead screw nut is assembled in the driving mechanism of the door, the elastic component provides elastic force to the lead screw nut to eliminate the gap between the lead screw nut and the lead screw, and makes the lead screw nut always remain coaxial with the lead screw, ensuring that the lead screw nut will not be deflected during the process of opening and closing the door, making the door opening and closing smoother, thereby reducing the idle travel when opening and closing the door, reducing the amount of shaking of the door, and eliminating the problem of "clang" abnormal noise when opening and closing the door.

[0006] In the above patent, after the screw nut and the screw are assembled, the center line position of the screw remains unchanged in the entire driver, and the screw nut is sleeved on the screw and can move along the screw while the screw rotates. Therefore, there must be a certain gap between the threaded through hole set on the screw nut and the screw to transmit the power. The role of the elastic component can only ensure that the entire screw nut has a downward or upward action under the action of the driver housing to make the upper or lower part of the threaded through hole contact with the screw (the gap is reduced), so that the gap below or above the corresponding threaded through hole will become larger, which will cause the center line of the threaded through hole and the center line of the screw to be parallel and cannot be colinear. For this reason, the nut structure set in the above patent still cannot solve the problem of abnormal noise during the use of the driver. Utility Model Content

[0007] In view of the deficiencies in the prior art, the utility model provides a sliding substructure of an automatic door opening and closing driver, which solves the problem of abnormal noise in the use of the electric door driver in the prior art.

[0008] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a sliding pair structure of an automatic door opening and closing driver, comprising a nut slider, a push rod and a screw rod movably connected to the nut slider, a threaded through hole is opened on the nut slider, the screw rod is sleeved in the threaded through hole and is threadedly driven by the threaded through hole, and also comprises a buffer nut, the buffer nut and the nut slider are fixed, a helix in the same direction as the threaded through hole is opened on the inner ring of the buffer nut, the buffer nut is sleeved on the screw rod and is threadedly connected to the screw rod and has an interference fit;

[0009] The center line of the buffer nut, the center line of the screw rod and the center line of the threaded through hole are arranged on the same line.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] The utility model adds a buffer nut on the basis of the existing screw and nut slider. The buffer nut is fixed to the nut slider and has an interference fit with the screw. In addition, the thread line of the inner ring of the buffer nut is the same as the thread line of the threaded through hole. This means that during the rotation of the screw, the threaded through hole will move and provide sufficient driving force to force the buffer nut to move with the nut slider. While ensuring that the movement of the nut slider is not affected, the problem of transmission clearance between the screw and the threaded through hole can be eliminated, thereby ensuring that the center line of the buffer nut, the center line of the screw and the center line of the threaded through hole can always remain in line during the working process, ensuring that the screw nut will not be deflected during the process of opening and closing the door, making the door opening and closing smoother, thereby reducing the idle travel when opening and closing the door, reducing the amount of shaking of the door, and eliminating the problem of "clang" abnormal noise when opening and closing the door.

[0012] Furthermore, the buffer nut is made of elastic material.

[0013] Furthermore, the nut slider includes a built-in metal frame and an external plastic layer that are wrapped and fixed. A mounting through hole is opened on the metal frame, and a plastic nut is fixed in the mounting through hole. The inner hole of the plastic nut is a threaded through hole.

[0014] Furthermore, a mounting groove is provided on the metal frame, the connecting end of the push rod is located in the mounting groove and is hinged to the mounting groove through a pin screw, and the center line of the pin screw is perpendicular to the center line of the threaded through hole;

[0015] The length direction of the push rod is parallel to the length direction of the screw rod, and the push rod rotates along the pin screw while moving with the rotation of the screw rod.

[0016] Furthermore, a connecting hole communicating with the mounting groove is provided on the nut slider, one end of the pin screw is fixed to the side wall of the mounting groove, and the other end of the pin screw is located in the mounting groove or in the connecting hole.

[0017] Furthermore, the outer wall of the plastic layer is in sliding contact with the inner wall of the housing of the driver, and the plastic layer is provided with a chamfered surface adapted to the bolt hole outside the housing, and the chamfered surface is provided with an arc-shaped recessed area with the center facing outward.

[0018] Furthermore, a mounting groove protruding outwardly along the threaded through hole is provided on the nut slider, and the buffer nut is embedded and fixed in the mounting groove.

[0019] Furthermore, the nut slider is provided with two inwardly recessed slide grooves and an outwardly protruding auxiliary slider, and the length direction of the slide groove is arranged along the length direction of the screw rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exploded schematic diagram of the installation of the utility model and the driver housing;

[0021] Figure 2 It is a cross-sectional view along the axial direction of the screw rod when the utility model and the driver housing are assembled;

[0022] Figure 3 It is a cross-sectional view along the radial direction of the screw rod when the utility model and the driver housing are assembled;

[0023] Figure 4 for Figure 3 A schematic diagram of a structure in which the housing and the lead screw are removed;

[0024] Figure 5 It is a cross-sectional view of the nut slider of the utility model along the radial direction of the screw rod;

[0025] Figure 6 It is a cross-sectional view of the nut slider of the utility model along the axial direction of the screw rod.

[0026] In the figure: housing 10, bolt hole 101, screw 2, push rod 3, sliding joint 31, pin screw 4, nut slider 1, metal frame 11, plastic layer 12, buffer nut 13, mounting groove 131, mounting groove 14, connecting hole 141, chamfered surface 15, arc-shaped recessed area 151, auxiliary slider 16, slide groove 17, plastic nut 18, threaded through hole 181. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0028] like Figure 1 , 2 As shown in Figure 3, a sliding substructure of an automatic door opening and closing driver is installed in the housing 10 of the driver and is installed in cooperation with the housing 10. The sliding substructure includes a nut slider 1, a push rod 3 and a screw rod 2. The push rod 3 and the screw rod 2 are both arranged horizontally, and the screw rod 2 is rotatably connected in the housing 10; a threaded through hole 181 is provided on the nut slider, the screw rod 2 is sleeved in the threaded through hole 181 and is threadedly driven by the threaded through hole 181, and the nut slider 1 is in contact with the inner wall of the housing 10 and is slidably arranged; the push rod 3 is located above the screw rod 2, and one end of the push rod 3 extends out of the housing 10 and is hinged to the door or the body, and the other end of the push rod 3 is hinged to the nut slider 1. When the screw rod 2 rotates under the action of a driving component (such as a servo motor coaxially arranged with the screw rod 2), the nut slider 1 threadedly connected to the screw rod 2 moves along the length direction of the screw rod 2, driving the push rod 3 to extend out of the housing 10, driving the door to rotate along the hinge point between the door and the body, and realizing the purpose of opening and closing the door.

[0029] In the prior art, in order to facilitate the installation of the driver, the driver is usually installed on the car door, and one end of the push rod 3 is hinged to the car body. When the push rod 3 moves with the nut slider 1, the other end of the push rod 3 will also rotate with the hinge point between the push rod 3 and the nut slider 1, so that the nut slider 1 has an additional force along the radial direction of the screw rod 2, causing the nut slider 1 to move axially along the screw rod 2, resulting in an idle stroke of the push rod 3, thereby increasing the idle stroke of the door edge. When switching the door back and forth, the idle stroke of the push rod 3 causes the door to produce an abnormal "clang" sound. In order to solve this problem, the utility model is also provided with a buffer nut 13. Figure 1 , 2As shown in Figures 3 and 4, the buffer nut 13 is fixed to the nut slider 1, and a spiral line in the same direction as the threaded through hole 181 is opened on the inner ring of the buffer nut 13. The buffer nut 13 is sleeved on the screw rod 2 and the screw rod 2 is threadedly connected and interference fit; and the center line of the buffer nut 13, the center line of the screw rod 2 and the center line of the threaded through hole 181 are arranged in a colinear manner. The buffer nut 13 can be arranged at any end of the threaded through hole 181 or inside the threaded through hole 181. Considering the convenience of production and processing, the buffer nut 13 is arranged at any end of the threaded through hole 181 and connected to the threaded through hole 181. Specifically, a mounting groove 131 protruding outward along the threaded through hole 181 is provided on the nut slider 1, and the buffer nut 13 is embedded in the mounting groove 131. The buffer nut 13 and the mounting groove 131 can be fixed by interference fit or by key connection, and it is ensured that the buffer nut 13 and the nut slider 1 are fixedly connected. As shown in Figure 3, the buffer nut 13 and the nut slider 1 are fixed by interference fit or by key connection. Figure 2 As shown, in this embodiment, the buffer nut 13 is arranged at one end of the threaded through hole 181 close to the push rod 3 (the left side position in the figure), so that the mounting groove 131 of the nut slider 1 can extend into the gear box (the shell in which the drive assembly is installed); if the buffer nut 13 is arranged on the right side of the threaded through hole 181 in the figure, the length of the product will increase, which is not conducive to miniaturization.

[0030] The buffer nut 13 added by the utility model is fixed to the nut slider 1 and has an interference fit with the screw rod 2, and the thread line of the inner ring of the buffer nut 13 is the same as the thread line of the threaded through hole 181. This means that during the rotation of the screw rod 2, the threaded through hole 181 will move, and provide sufficient driving force to force the buffer nut 13 to move with the nut slider 1. While ensuring that the movement of the nut slider 1 is not affected, the problem of transmission clearance between the screw rod 2 and the threaded through hole 181 can be eliminated, thereby ensuring that the center line of the buffer nut 13, the center line of the screw rod 2 and the center line of the threaded through hole 181 can always remain in line during the working process, ensuring that the screw rod 2 nut will not be deflected during the process of opening and closing the door, making the door opening and closing smoother, thereby reducing the idle travel when opening and closing the door, reducing the amount of shaking of the door, and eliminating the problem of "clang" abnormal noise when opening and closing the door.

[0031] In order to reduce wear, not affect the transmission of the nut slider 1 and reduce transmission noise, the buffer nut 13 of the utility model is made of elastic material. The elastic material can be rubber material, silicone rubber material, polyurethane elastomer, polyester elastomer, etc. in the prior art. In this embodiment, the buffer nut 13 is made of rubber material, and the rubber has a certain elasticity. While tightly covering the screw rod 2, it can move with the nut slider 1 under the action of external extrusion force (transmission force between the rotation of the screw rod 2 and the threaded through hole 181), ensuring that the nut slider 1 can slide back and forth on the screw rod 2.

[0032] The slider in the prior art is made of metal material as a whole to ensure sufficient rigidity and strength, and to ensure that the slider can be used for a long time; at the same time, a plastic lining is provided in the threaded hole of the slider and is threadedly connected to the screw rod 2 to reduce abnormal transmission noise and ensure the stability of the mutual movement of the slider and the screw rod 2. However, the outer wall of the slider needs to be in sliding contact with the inner wall of the outer casing 10 of the driver, and the through groove of the outer casing 10 is made of metal. If the slider is made of metal, the two are in rigid contact and the friction noise is relatively large. To solve this problem, in another embodiment of the utility model, the nut slider 1 adopts a double-layer structure, including a built-in metal frame 11 that is wrapped and fixed and an external plastic layer 12. A mounting through hole is opened on the metal frame 11, and a plastic nut 18 is fixed in the mounting through hole. The inner hole of the plastic nut 18 is a threaded through hole 181. Figure 2 , 3 As shown in Figures 4, 5, and 6, the nut slider 1 of the utility model includes a three-layer structure from the inside to the outside. The plastic nut 18 is the first layer structure. The plastic nut 18 and the threaded through hole 181 are fixed by interference fit or key connection. It can also be fixed with the plastic layer 12 in the direction of secondary injection molding and the threaded through hole 181. The plastic nut 18 and the screw rod 2 are threadedly connected, which reduces the transmission noise and has better wear resistance, so that the entire nut slider 1 can slide stably on the screw rod 2. The metal skeleton 11 is the second layer. The setting of the metal skeleton 11 can ensure that the entire nut slider 1 has sufficient rigidity and strength. The metal skeleton 11 can be die-casted by aluminum alloy or zinc alloy. The outermost plastic layer 12 is in sliding contact with the inner wall of the shell 10, and the plastic layer 12 is obtained by secondary injection molding of the outer rubber. For this reason, the overall structure of the nut slider 1 is actually determined by the metal skeleton 11. The metal skeleton 11 has better strength and rigidity than the general method of using an intermediate metal core (cylindrical core). The outer plastic layer 12 can ensure that the contact parts between the nut slider 1 and the inner wall of the shell 10 are made of plastic material. The sliding friction of the plastic material has the effect of reducing vibration and noise, so that the nut slider 1 of the utility model has less noise during the movement in the shell 10.

[0033] In order to reduce the distance between the center line of the push rod 3 and the center line of the screw rod 2 to improve work efficiency, the push rod 3 of the utility model is embedded in the nut slider 1 and hinged with the nut slider 1. In order to ensure that the connection between the push rod 3 and the nut slider 1 is more stable, the push rod 3 is connected to the metal frame 11. The metal frame 11 is provided with a mounting groove 14. The connecting end of the push rod 3 is located in the mounting groove 14 and is hinged to the mounting groove 14 through a pin screw 4. The center line of the pin screw 4 is perpendicular to the center line of the threaded through hole 181. The length direction of the push rod 3 is parallel to the length direction of the screw rod 2, and the push rod 3 rotates along the pin screw 4 while moving with the rotation of the screw rod 2. Figure 5 , 6As shown, the mounting groove 14 can adopt a rectangular groove structure or a rectangular through-cavity structure. The setting of the mounting groove 14 facilitates the end of the push rod 3 to be embedded in the mounting groove 14. The two side walls of the mounting groove 14 and the swing angle limit of the push rod 3, and the pin screw 4 and the metal frame 11 can have sufficient connection strength, so that the connection between the push rod 3 and the nut slider 1 is more stable. In this embodiment, the mounting groove 14 adopts a rectangular through-cavity structure, the direction of the rectangular through-cavity is consistent with the length direction of the screw rod 2, and the end of the sliding joint 31 of the push rod 3 is embedded in the mounting groove 14. The above structure can minimize the distance between the center line of the push rod 3 and the center line of the screw rod 2, and the design limit can reach within 20mm. The push rod 3 (sliding joint 31) can be firmly fixed on the nut slider 1 and can rotate around the pin screw 4, so that the internal space of the driver can be set more compactly, reducing the space occupation of the driver, which is more conducive to the installation and layout of the driver on different models of car doors.

[0034] In order to avoid the problem of rigid sliding abnormal noise caused by the pin screw 4 extending out of the nut slider 1 and contacting the inner wall of the housing 10, and to facilitate the installation of the pin screw 4, in another embodiment of the utility model, a connecting hole 141 connected to the installation groove 14 is provided on the nut slider 1, one end of the pin screw 4 is fixed to the side wall of the installation groove 14, and the other end of the pin screw 4 is located in the installation groove 14 or in the connecting hole 141. Figure 5 , 6 As shown, since the plastic layer 12 is wrapped along the outer side of the metal frame 11, the corresponding connection hole 141 opened on the metal frame 11 will not be covered by the plastic layer 12. When installing, the pin screw 4 is inserted from the connection hole 141 into the installation groove 14 and the through hole opened in the sliding joint 31 of the push rod 3, and is fastened to the threaded hole of the metal frame 11, so that the assembly of the push rod 3 and the nut slider 1 can be completed. Since the pin screw 4 can limit the push rod 3 in the up and down directions, the movement of the push rod 3 is more stable.

[0035] The driver housing 10 needs to be fixed to the car door. For this purpose, a bolt hole 101 is provided on the outer side of the housing 10. To ensure the stability of the connection between the housing 10 and the car door, the thickness of the outer wall corresponding to the bolt hole 101 must be consistent, which means that the outer wall position corresponding to the bolt hole 101 will be convex toward the inner wall of the housing 10. In another embodiment of the utility model, in order to make the overall structure of the driver more compact, a chamfered surface 15 adapted to the bolt hole 101 outside the housing 10 is provided on the plastic layer 12, and an arc-shaped concave area 151 with the center of the circle facing outward is provided on the chamfered surface 15. Figure 4 , 5As shown, two relatively inclined chamfered surfaces 15 are provided at the upper corners of the plastic layer 12, and an arc-shaped recessed area 151 with the center facing outward is provided in the middle of the chamfered surface 15. The arc-shaped recessed area 151 and the bolt hole 101 are adapted to the corresponding protruding positions on the inner wall of the housing 10. The arrangement of this structure can further reduce the design size of the driver housing 10 and further ensure the compactness of the overall structure of the driver.

[0036] In the prior art, the nut slider 1 slides in the housing 10, and a sliding groove or a sliding block protruding outward is set on the nut slider 1, and an adaptive sliding block or sliding groove is set on the inner wall of the housing 10 to ensure that the nut slider 1 can slide and limit when moving on the screw rod 2. However, in the prior art, the setting position of the sliding block or sliding groove is between the screw rod 2 and the push rod 3 or above the push rod 3. This setting method is not conducive to the stable movement of the sliding block. For this reason, in another embodiment of the utility model, two inwardly recessed sliding grooves 17 and an outwardly protruding auxiliary slider 16 are provided on the nut slider 1, and the length direction of the sliding groove 17 is set along the length direction of the screw rod 2. Figure 3 As shown, two slide grooves 17 are arranged between the screw rod 2 and the push rod 3, and the auxiliary slider 16 is located below the screw rod 2. This layout can provide limiting support force for the upper and lower directions of the screw rod 2, ensuring that the nut slider 1 slides smoothly along the screw rod 2 with better stability.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A sliding pair structure of an automatic door opening and closing actuator, comprising a nut slider (1), a push rod (3) movably connected to the nut slider (1) and a screw rod (2), wherein a threaded through hole (181) is provided on the nut slider (1), the screw rod (2) is sleeved in the threaded through hole (181) and is threadedly driven by the threaded through hole (181), and characterized in that: It also includes a buffer nut (13), the buffer nut (13) and the nut slider (1) are fixed, the inner ring of the buffer nut (13) is provided with a spiral line in the same direction as the threaded through hole (181), the buffer nut (13) is sleeved on the screw rod (2) and the screw rod (2) is threadedly connected and interference fit; Furthermore, the center line of the buffer nut (13), the center line of the screw rod (2) and the center line of the threaded through hole (181) are arranged on the same line.

2. The sliding pair structure of the automatic door opening and closing actuator according to claim 1, characterized in that: The buffer nut (13) is made of elastic material.

3. The sliding pair structure of the automatic door opening and closing actuator according to claim 1 or 2, characterized in that: The nut slider (1) comprises a built-in metal frame (11) and an external plastic layer (12) that are wrapped and fixed. A mounting through hole is provided on the metal frame (11). A plastic nut (18) is fixed in the mounting through hole. The inner hole of the plastic nut (18) is a threaded through hole (181).

4. The sliding pair structure of the automatic door opening and closing actuator according to claim 3, characterized in that: A mounting groove (14) is provided on the metal frame (11), the connecting end of the push rod (3) is located in the mounting groove (14) and is hingedly connected to the mounting groove (14) through a pin screw (4), and the center line of the pin screw (4) is perpendicular to the center line of the threaded through hole (181); The length direction of the push rod (3) is parallel to the length direction of the screw rod (2), and the push rod (3) rotates along the pin screw (4) while moving along with the rotation of the screw rod (2).

5. The sliding pair structure of the automatic door opening and closing actuator according to claim 4, characterized in that: The nut slider (1) is provided with a connecting hole (141) which is arranged in communication with the mounting groove (14); one end of the pin screw (4) is fixed to the side wall of the mounting groove (14); and the other end of the pin screw (4) is located in the mounting groove (14) or in the connecting hole (141).

6. The sliding pair structure of the automatic door opening and closing actuator according to claim 3, characterized in that: The outer wall of the plastic layer (12) is in sliding contact with the inner wall of the housing (10) of the driver, and the plastic layer (12) is provided with a chamfered surface (15) adapted to the bolt hole (101) outside the housing (10), and the chamfered surface (15) is provided with an arc-shaped recessed area (151) with its center facing outward.

7. The sliding pair structure of the automatic door opening and closing actuator according to claim 4 or 5, characterized in that: The outer wall of the plastic layer (12) is in sliding contact with the inner wall of the housing (10) of the driver, and the plastic layer (12) is provided with a chamfered surface (15) adapted to the bolt hole (101) outside the housing (10), and the chamfered surface (15) is provided with an arc-shaped recessed area (151) with its center facing outward.

8. The sliding pair structure of the automatic door opening and closing actuator according to claim 1, 2, 4, 5 or 6, characterized in that: A mounting groove (131) is provided on the nut slider (1) and is protruded outwardly along the threaded through hole (181). The buffer nut (13) is embedded and fixed in the mounting groove (131).

9. The sliding pair structure of the automatic door opening and closing actuator according to claim 1, 2, 4, 5 or 6, characterized in that: The nut slider (1) is provided with two inwardly recessed slide grooves (17) and an outwardly protruding auxiliary slider (16), and the length direction of the slide groove (17) is arranged along the length direction of the screw rod (2).

Images