An adjustable center distance wiper motor crank

Abstract

The utility model relates to a rain -wiper motor crank with adjustable center distance, including the connecting plate of one end with external motor connection, adjustable installation has with external connecting rod connection eccentric ball head in one end of connecting plate, the adjusting hole of installing is set up to the adjusting piece in connecting plate and eccentric ball head, eccentric ball head rotatory setting is in connecting plate, and eccentric ball head can rotate to connecting plate, when rotating eccentric ball head to different angle position, change the distance between the center point of eccentric ball head connection external connecting rod and the center point of connecting plate connection motor end, realize the adjustment of center distance.

Description

Technical Field

[0001] This utility model relates to the field of motor crank technology, specifically to a wiper motor crank with adjustable center distance. Background Technology

[0002] The wiper motor crank is the core component of the wiper drive system. It is usually made of high-strength metal or composite materials and has an L / Z shape. Its two ends are connected to the wiper motor output shaft through rigid interfaces and to the wiper linkage through movable interfaces. Its core function is to convert the continuous rotational motion of the motor into the reciprocating oscillating motion of the wiper linkage, realizing power transmission and precisely controlling the oscillation amplitude of the wiper arm. The working principle is based on a crank-rocker mechanism. The rotation of the motor drives the crank to rotate, and the rotation is converted into reciprocating driving force through the linkage, which ultimately drives the wiper arm to complete the wiping action. The design must take into account material matching, connection gap control and environmental adaptability to ensure wiping effect, noise control and service life.

[0003] CN208871819U discloses a connection structure between a motor crank and a swing connecting rod, and an air conditioner having the same. The connection structure is assembled using a rotational misalignment method: the swing connecting rod includes a body and a protrusion at the front end of the body; the motor crank has a crank plane and a contoured groove that conforms to the protrusion; the protrusion and the contoured groove allow for hole-to-hole assembly of the swing connecting rod and the motor crank; after rotational misalignment, the protrusion and crank plane are positioned in a limited manner. This connection structure, through the rotational misalignment method of the motor crank and the swing connecting rod, enables rapid installation and disassembly of the motor crank and the swing connecting rod, reducing labor intensity and simultaneously improving assembly efficiency. However, this motor crank has poor adaptability and cannot be universally used with products of different center distances. When applied to products with different center distances, the motor crank needs to be re-molded, increasing production costs. Therefore, this technology still has room for improvement. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an adjustable center distance wiper motor crank to address the shortcomings of the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an adjustable center distance wiper motor crank, comprising a connecting plate connected to an external motor at one end, characterized in that: an eccentric ball head connected to an external connecting rod is adjustablely mounted on one end of the connecting plate, and both the connecting plate and the eccentric ball head are provided with adjustment holes for installing adjustment components, and the eccentric ball head is rotatably mounted on the connecting plate.

[0006] By adopting the above technical solution, an adjustable eccentric ball head is set at one end of the connecting plate, and both the connecting plate and the eccentric ball head are provided with adjustment holes for the installation of adjustment components. The eccentric ball head can rotate relative to the connecting plate. When the eccentric ball head is rotated to different angle positions, the adjustment components pass through the corresponding adjustment holes to fix the two together, thereby changing the distance between the center point of the eccentric ball head connecting to the external connecting rod and the center point of the connecting plate connecting to the motor end, thus realizing the adjustment of the center distance. In view of the problem of poor adaptability of motor cranks and inability to use products with different center distances in the background technology, the rotation adjustment of the eccentric ball head and the cooperation and fixing of the adjustment holes make the same motor crank adaptable to the assembly requirements of different center distances by adjusting the relative position of the eccentric ball head. There is no need to re-mold and manufacture motor cranks for different center distances, which improves the versatility of motor cranks and reduces production costs. At the same time, the adjustable installation method makes it easy to flexibly adjust the center distance according to the actual assembly scenario, improving the adaptability and convenience of assembly.

[0007] The aforementioned adjustable center distance wiper motor crank can be further configured such that: the adjustment hole is a regular hexagonal hole, the adjustment hole is eccentrically located on an eccentric ball head, the adjustment component is a regular hexagonal shaft, the eccentric ball head can rotate axially around the adjustment component through the adjustment hole, and the outer periphery of the eccentric ball head is provided with a connection hole that can be fixedly connected to an external connecting rod.

[0008] The above technical solution employs an eccentric setting for the hexagonal adjustment hole on the eccentric ball head, meaning the central axis of the adjustment hole does not coincide with the central axis of the eccentric ball head itself. The hexagonal shaft adjustment component engages with the hexagonal adjustment hole. Utilizing the equal length and sharp angles of the hexagonal structure, the adjustment component achieves circumferential positioning through planar contact after insertion into the adjustment hole. The eccentric ball head can rotate axially around the hexagonal shaft. During rotation, due to the eccentric setting of the adjustment hole, the center position of the connecting hole on the outer circumference of the eccentric ball head will move in a circular trajectory around the axis of the adjustment component, thereby changing the center distance between the connecting hole and the motor end of the connecting plate. The engagement of the hexagonal adjustment hole and the hexagonal shaft ensures positioning stability during adjustment, preventing loosening of the connection due to vibration or other factors after adjustment. The eccentric setting allows the connecting hole to be in different circumferential positions by rotating the eccentric ball head, achieving center distance adjustment without the need to replace motor cranks of different sizes. The connection hole setting ensures reliable fixation with the external connecting rod, enabling the same motor crank to adapt to various center distance assembly requirements.

[0009] The aforementioned adjustable center distance wiper motor crank can be further configured such that: an inner groove is provided on the outer periphery of the eccentric ball head; the adjusting component includes a hexagonal connecting shaft and rivet pieces disposed at both ends of the hexagonal connecting shaft; the hexagonal connecting shaft is placed in the adjusting hole; the rivet pieces are placed in the inner groove and abut against the inner groove; the rivet piece at the end of the hexagonal connecting shaft away from the inner groove abuts against the surface of the connecting plate, causing the hexagonal connecting shaft to be limited and disposed in the adjusting hole.

[0010] Using the above technical solution, the inner groove on the outer periphery of the eccentric ball head is used to accommodate the riveting piece at one end of the adjusting component. The hexagonal connecting shaft of the adjusting component is inserted into the regular hexagonal adjusting hole of the eccentric ball head. Circumferential positioning is achieved through the planar fit of the hexagonal structure. The riveting pieces at both ends of the adjusting component abut against the inner wall of the inner groove and the surface of the connecting plate, respectively. The riveting piece in the inner groove is limited by the inner groove and cannot move outward along the axial direction, while the riveting piece on the surface of the connecting plate restricts the axial movement of the connecting shaft inward. The two together form an axial clamping force to fix the hexagonal connecting shaft in the adjusting hole. At the same time, the eccentric ball head can rotate around the axial direction of the hexagonal connecting shaft to adjust the center distance.

[0011] The aforementioned adjustable center distance wiper motor crank can be further configured such that: the eccentric ball head includes an abutting post that abuts against the connecting plate and a ball that is connected to an external connecting rod, the diameter of the ball being larger than the diameter of the connecting post, and the inner groove and connecting hole having a ball surface.

[0012] Using the above technical solution, the abutment post of the eccentric ball head is used to directly contact the surface of the connecting plate. Its diameter is smaller than that of the ball, so that the abutment post and the connecting plate form a partial contact support. The ball, as the main structure of the eccentric ball head, has a larger diameter than the abutment post, so its outer circumferential surface can provide more space for opening the embedded groove and connecting hole. The embedded groove and connecting hole are both set on the surface of the ball, and the ball and the abutment post are an integrated structure. The central axis of the abutment post is collinear with the central axis of the ball or forms a preset eccentric distance. When the eccentric ball head rotates axially around the adjusting component, the abutment post rotates synchronously with the ball and always maintains contact with the connecting plate, while the connecting hole on the surface of the ball makes a circular motion around the axis of the adjusting component to change the center distance.

[0013] The aforementioned adjustable center distance wiper motor crank can be further configured such that: the connecting plate includes a motor connecting end connected to an external motor and a rod connecting end connected to an external connecting rod; the motor connecting end has a fixing hole for connecting to an external motor; the eccentric ball head is installed on the rod connecting end; and the motor connecting end and the rod connecting end are connected by a slanted panel to make the connecting plate form a Z-shape.

[0014] Using the above technical solution, the motor connection end and the rod connection end of the connecting plate are connected by a slanted panel to form a Z-shaped structure. That is, the mounting plane of the motor connection end and the mounting plane of the rod connection end are transitioned by the slanted panel, so that the axial direction or spatial position of the two forms a certain angle or misalignment. The length and tilt angle of the slanted panel directly determine the relative distance and spatial posture of the motor connection end and the rod connection end. The motor connection end is rigidly connected to the external motor through a fixing hole, while the rod connection end is equipped with an eccentric ball head.

[0015] The aforementioned adjustable center distance wiper motor crank can be further configured such that: each of the adjustment holes is provided with a vertical extension groove at the interior corner of the hexagon, and the extension groove causes the adjustment hole to have a certain degree of extension.

[0016] Using the above technical solution, an extension groove is vertically set at each inner corner of the regular hexagonal adjustment hole. That is, the extension groove extends outward from the adjustment hole along the angle bisector of the inner corner of the hexagon. The depth of the groove is less than the wall thickness of the adjustment hole, so that the inner wall of the adjustment hole forms an independent elastic petal structure separated by the extension groove at the inner corner position. When the adjustment hole is subjected to external radial or circumferential force, the elastic petal can undergo slight elastic deformation along the direction of the extension groove, so that the adjustment hole as a whole has a certain shape extensibility.

[0017] The aforementioned adjustable center distance wiper motor crank can be further configured such that: the surface of the eccentric ball head is a plane, the connecting hole and the inner groove are both opened on the plane, and the adjustment hole is placed in the inner groove.

[0018] Using the above technical solution, the surface of the eccentric ball head is set as a plane, and the connecting hole and the inner groove are both opened on this plane. The adjustment hole is placed in the inner groove. The plane serves as a machining reference plane. The positional accuracy of the connecting hole, the inner groove and the adjustment hole can be controlled by plane positioning. The inner groove provides a space for the adjustment hole, so that the adjustment part does not protrude from the plane surface after being embedded in the groove.

[0019] The beneficial effects of this utility model are: the eccentric ball head can rotate relative to the connecting plate. When the eccentric ball head is rotated to different angle positions, the distance between the center point of the eccentric ball head connecting to the external connecting rod and the center point of the connecting plate connecting to the motor end is changed, thereby realizing the adjustment of the center distance. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the structure of this utility model; Figure 3 This is a structural diagram of the eccentric ball head of this utility model; Label annotations: 1-Connecting plate, 2-Eccentric ball head, 3-Adjusting component, 4-Adjusting hole, 5-Connecting hole, 6-Inset groove, 7-Hexagonal connecting shaft, 8-Riveting piece, 9-Abutting post, 10-Sphere, 11-Motor connecting end, 12-Rod connecting end, 13-Fixing hole, 14-Slanted panel, 15-Extension groove, 16-Flat surface. Detailed Implementation

[0021] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0022] like Figure 1-3The present invention provides the following technical solution: an adjustable center distance wiper motor crank, including a connecting plate 1 connected to an external motor at one end, an eccentric ball head 2 judiciously mounted on one end of the connecting plate 1 and connected to an external connecting rod, both the connecting plate 1 and the eccentric ball head 2 having adjustment holes 4 for mounting adjustment components 3, the eccentric ball head 2 being rotatably mounted on the connecting plate 1, and the eccentric ball head 2 being judiciously mounted on one end of the connecting plate 1, with adjustment holes 4 for mounting adjustment components 3 on both the connecting plate 1 and the eccentric ball head 2, allowing the eccentric ball head 2 to rotate relative to the connecting plate 1. When the eccentric ball head 2 is rotated to different angular positions, the adjustment components 3 are used to pass through the corresponding adjustment holes 4 to fix both. The center distance is adjusted by changing the distance between the center point of the eccentric ball head 2 connecting to the external connecting rod and the center point of the connecting plate 1 connecting to the motor end. Addressing the issue of poor adaptability and inability to use motor cranks with different center distances in the background technology, the rotation adjustment of the eccentric ball head 2 and the fixing with the adjustment hole 4 allow the same motor crank to adapt to assembly requirements with different center distances by adjusting the relative position of the eccentric ball head 2. This eliminates the need to re-mold and manufacture motor cranks for different center distances, improving the versatility of the motor crank and reducing production costs. Furthermore, the adjustable installation method allows for flexible adjustment of the center distance according to actual assembly scenarios, enhancing the adaptability and convenience of assembly. The adjusting hole 4 is a regular hexagonal hole, eccentrically positioned on the eccentric ball head 2. The adjusting component 3 is a regular hexagonal shaft. The eccentric ball head 2 can rotate axially around the adjusting component 3 through the adjusting hole 4. The outer circumference of the eccentric ball head 2 is provided with a connecting hole 5 for fixed connection with an external connecting rod. The regular hexagonal adjusting hole 4 on the eccentric ball head 2 is eccentrically positioned, meaning that the central axis of the adjusting hole 4 does not coincide with the central axis of the eccentric ball head 2 itself. The regular hexagonal shaft adjusting component 3 cooperates with the regular hexagonal adjusting hole 4. Utilizing the characteristics of the regular hexagonal structure with equal sides and sharp angles, the adjusting component 3 is inserted into the adjusting hole 4 and achieves circumferential positioning through contact with the plane 16. The eccentric ball head 2 can rotate axially around the regular hexagonal shaft. During the rotation process, due to the eccentric setting of the adjustment hole 4, the center position of the connecting hole 5 on the outer periphery of the eccentric ball head 2 will move in a circular trajectory around the axis of the adjustment component 3, thereby changing the center distance between the connecting hole 5 and the motor end of the connecting plate 1. The cooperation between the regular hexagonal adjustment hole 4 and the regular hexagonal shaft ensures the positioning stability during adjustment and avoids loosening of the connection due to vibration and other factors after adjustment. The eccentric setting allows the connecting hole 5 to be in different circumferential positions by rotating the eccentric ball head 2, realizing the adjustment of the center distance without the need to replace motor cranks of different sizes. The setting of the connecting hole 5 ensures reliable fixation with the external connecting rod, so that the same motor crank can adapt to the assembly requirements of multiple center distances.

[0023] like Figure 1-3The present invention provides the following technical solution: an adjustable center distance wiper motor crank, wherein an eccentric ball head 2 has an inner groove 6 on its outer periphery, and an adjusting component 3 includes a hexagonal connecting shaft 7 and rivet pieces 8 disposed at both ends of the hexagonal connecting shaft 7. The hexagonal connecting shaft 7 is placed in an adjusting hole 4, and the rivet pieces 8 are placed in the inner groove 6 and abut against the inner groove 6. The rivet piece 8 at the end of the hexagonal connecting shaft 7 away from the inner groove 6 abuts against the surface of the connecting plate 1, causing the hexagonal connecting shaft 7 to be limited and disposed in the adjusting hole 4. The inner groove 6 on the outer periphery of the eccentric ball head 2 is used to accommodate one end of the rivet piece 8 of the adjusting component 3. The hexagonal connecting shaft 7 of the adjusting component 3 is inserted into the regular hexagonal adjusting hole 4 of the eccentric ball head 2, and circumferential positioning is achieved through the cooperation of the plane 16 of the hexagonal structure. The rivet pieces 8 at both ends abut against the inner wall of the recessed groove 6 and the surface of the connecting plate 1, respectively. The rivet pieces 8 inside the recessed groove 6 are limited by the recessed groove 6 and cannot move outward axially, while the rivet pieces 8 on the surface of the connecting plate 1 restrict the axial movement of the connecting shaft inward. Together, they form an axial clamping force, fixing the hexagonal connecting shaft 7 within the adjusting hole 4. Simultaneously, the eccentric ball head 2 can rotate around the axial direction of the hexagonal connecting shaft 7 to adjust the center distance. The eccentric ball head 2 includes an abutment post 9 that abuts against the connecting plate 1 and a ball 10 connected to the external connecting rod. The diameter of the ball 10 is larger than the diameter of the connecting post. The recessed groove 6 and the connecting hole 5 have surfaces for the ball 10. The abutment post 9 of the eccentric ball head 2 is used for direct contact with the surface of the connecting plate 1, and its diameter is smaller than the diameter of the ball 10, allowing the abutment post 9 to directly contact the surface of the connecting plate 1. Plate 1 forms a partial contact support. The sphere 10, as the main structure of the eccentric ball head 2, has a larger diameter than the abutment post 9, allowing for more space on its outer circumferential surface to accommodate the recessed groove 6 and connecting hole 5. Both the recessed groove 6 and connecting hole 5 are located on the surface of the sphere 10. The sphere 10 and the abutment post 9 are an integrated structure. The central axis of the abutment post 9 is collinear with or forms a preset eccentricity with the central axis of the sphere 10. When the eccentric ball head 2 rotates axially around the adjusting member 3, the abutment post 9 rotates synchronously with the sphere 10 and always remains in contact with the connecting plate 1. The connecting hole 5 on the surface of the sphere 10 then rotates in a circular motion around the axis of the adjusting member 3 to change the center distance. The connecting plate 1 includes a motor connection end 11 connected to an external motor and a rod connection end 12 connected to an external connecting rod. The motor connection end 11 has a fixing hole 13 for connecting to an external motor. The eccentric ball head 2 is installed on the rod connection end 12. The motor connection end 11 and the rod connection end 12 are connected by a beveled plate 14, causing the connecting plate 1 to form a Z-shape. The motor connection end 11 and the rod connection end 12 of the connecting plate 1 are connected by the beveled plate 14 to form a Z-shaped structure. That is, the mounting plane 16 of the motor connection end 11 and the mounting plane 16 of the rod connection end 12 are transitioned by the beveled plate 14, so that the axial direction or spatial position of the two forms a certain angle or misalignment. The length and tilt angle of the beveled plate 14 directly determine the relative distance and spatial posture of the motor connection end 11 and the rod connection end 12. The motor connection end 11 is rigidly connected to the external motor through the fixing hole 13.An eccentric ball head 2 is installed at the rod connection end 12. An extension groove 15 is vertically provided at each interior corner of the hexagonal adjustment hole 4. The extension groove 15 gives the adjustment hole 4 a certain degree of extensibility. The extension groove 15 is vertically provided at each interior corner of the regular hexagonal adjustment hole 4, meaning the extension groove 15 extends outward from the adjustment hole 4 along the angle bisector of the hexagonal interior corner. The groove depth is less than the wall thickness of the adjustment hole 4, causing the inner wall of the adjustment hole 4 to form independent elastic flap structures separated by the extension groove 15 at the interior corner positions. When the adjustment hole 4 is subjected to external radial or circumferential forces, the elastic flaps can undergo slight changes along the direction of the extension groove 15. Elastic deformation gives the adjusting hole 4 a certain degree of shape extensibility. The surface of the eccentric ball head 2 is a plane 16, and the connecting hole 5 and the inner groove 6 are both located on the plane 16. The adjusting hole 4 is placed in the inner groove 6. The plane 16 serves as a machining reference surface, and the positional accuracy of the connecting hole 5, the inner groove 6, and the adjusting hole 4 can be controlled through positioning on the plane 16. The inner groove 6 provides a space for the adjusting hole 4, ensuring that the adjusting part 3 does not protrude from the surface of the plane 16 after being embedded in the groove.

[0024] The beneficial effects of this utility model are: the eccentric ball head 2 can rotate relative to the connecting plate 1. When the eccentric ball head 2 is rotated to different angle positions, the distance between the center point of the eccentric ball head 2 connecting to the external connecting rod and the center point of the connecting plate 1 connecting to the motor end is changed, thereby realizing the adjustment of the center distance.

Claims

1. A wiper motor crank with adjustable center distance, comprising a connecting plate at one end connected to an external motor, characterized in that: One end of the connecting plate is adjustablely fitted with an eccentric ball head that connects to an external connecting rod. Both the connecting plate and the eccentric ball head have adjustment holes for installing adjustment components. The eccentric ball head is rotatably mounted on the connecting plate.

2. The windshield wiper motor crank with adjustable center distance according to claim 1, characterized in that: The adjustment hole is a regular hexagonal hole, which is eccentrically located on the eccentric ball head. The adjustment component is a regular hexagonal shaft. The eccentric ball head can rotate axially around the adjustment component through the adjustment hole. The outer periphery of the eccentric ball head is provided with a connection hole that can be fixedly connected to an external connecting rod.

3. The windshield wiper motor crank with adjustable center distance according to claim 2, characterized in that: The eccentric ball head has an inner groove on its outer periphery. The adjusting component includes a hexagonal connecting shaft and rivet pieces disposed at both ends of the hexagonal connecting shaft. The hexagonal connecting shaft is placed in the adjusting hole, and the rivet pieces are placed in the inner groove and abut against the inner groove. The rivet piece at the end of the hexagonal connecting shaft away from the inner groove abuts against the surface of the connecting plate, causing the hexagonal connecting shaft to be limited and disposed in the adjusting hole.

4. The windshield wiper motor crank with adjustable center distance according to claim 3, characterized in that: The eccentric ball head includes an abutting post that abuts against the connecting plate and a ball that is connected to an external connecting rod. The diameter of the ball is larger than the diameter of the connecting post, and the inner groove and the connecting hole are provided with the surface of the ball.

5. A wiper motor crank with adjustable center distance according to any one of claims 1-4, characterized in that: The connecting plate includes a motor connecting end connected to an external motor and a rod connecting end connected to an external connecting rod. The motor connecting end has a fixing hole for connecting to an external motor. The eccentric ball head is installed on the rod connecting end. The motor connecting end and the rod connecting end are connected by a slanted panel to make the connecting plate form a Z-shape.

6. The windshield wiper motor crank with adjustable center distance according to claim 5, characterized in that: The adjustment hole is provided with vertical extension grooves at the interior corners of the hexagon, and the extension grooves enable the adjustment hole to have a certain degree of extensibility.

7. The windshield wiper motor crank with adjustable center distance according to claim 4, characterized in that: The surface of the eccentric ball head is flat, and the connecting hole and the inner groove are both opened on the flat surface. The adjustment hole is placed in the inner groove.

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