An overload protection linkage shaft
By designing a wedge pin and a return spring structure between the drive shaft and the driven shaft, the problem of the linkage shaft jamming under overload conditions is solved, achieving overload protection for the linkage shaft and avoiding damage to the core equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU FANYING MACHINERY TECHNOLOGY CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-06-02
AI Technical Summary
In mechanical transmission systems, under overload conditions, the linkage shaft can easily lead to damage to core equipment, and existing technologies lack effective overload protection measures.
A wedge pin and a return spring structure are designed between the drive shaft and the driven shaft. The wedge pin fits into the wedge teeth, and the wedge pin pushes the return spring inside the wedge pin tube to disengage the wedge pin from the wedge teeth, allowing the drive shaft to continue rotating and preventing overload jamming.
This effectively avoids motor overload, prevents damage to core equipment in the transmission chain, and ensures that the system continues to operate normally under overload conditions.
Smart Images
Figure CN224315390U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of transmission shaft technology, and in particular relates to an overload protection linkage shaft. Background Technology
[0002] In mechanical transmission systems, the linkage shaft is a key component for transmitting torque and rotational motion. However, when the system encounters unexpected overloads, such as jamming or impact loads, excessive torque may cause serious damage to expensive core equipment in the transmission chain, such as motors, reducers, and precision actuators, resulting in shaft breakage, gear tooth breakage, or motor burnout. Therefore, it is crucial to integrate reliable and effective overload protection functions into the linkage shaft.
[0003] To address these issues, we provide an overload protection linkage shaft. Utility Model Content
[0004] The purpose of this utility model is to provide an overload protection linkage shaft. A square column is fixed to the end face of a sleeve at one end of the drive shaft, and an adapter sleeve is fixed to one end of the driven shaft. The adapter sleeve is fitted onto the outside of the square column. A set of wedge-faced pin tubes are circumferentially arrayed and sleeved through the side wall of the adapter sleeve. A set of wedge-faced pins are slidably fitted inside the wedge-faced pin tubes, with the wedge face of the wedge-faced pins engaging with the wedge-faced teeth on the side of the square column. When the drive shaft rotates, the wedge-faced teeth push the wedge-faced pins, causing the driven shaft to rotate with the drive shaft. When one end of the driven shaft is jammed, the wedge face of the wedge-faced teeth pushes the wedge-faced pins into the wedge-faced pin tubes, causing the wedge-faced pins to press against the return spring inside the wedge-faced pin tubes, disengaging the wedge-faced pins from the wedge-faced teeth. This allows the square column to continue rotating within the adapter sleeve, thus enabling the drive shaft to continue rotating even when the driven shaft is jammed due to overload, preventing motor overload.
[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0006] This utility model is an overload protection linkage shaft, including a driving shaft and a driven shaft. A sleeve post is fixedly provided on one end face of the driving shaft, and a square post is fixedly provided on the end face of the sleeve post. Wedge teeth are fixedly provided on the four sides of the square post. An adapter sleeve is fixedly provided on one end of the driven shaft. The adapter sleeve is rotatably sleeved on the outside of the square post. A wedge pin tube is circumferentially arrayed and sleeved through the side wall of the adapter sleeve. A wedge pin is slidably sleeved inside the wedge pin tube. The wedge surface of the wedge pin is in contact with the wedge surface of the wedge teeth. A return spring is sleeved inside the wedge pin tube. The two ends of the return spring are fixedly connected to the end face of the wedge pin and the inner top surface of the wedge pin tube, respectively.
[0007] A further feature of this invention is that one end of the wedge pin tube that passes through the side wall of the adapter sleeve is fitted with a tube end sleeve, and a locking component is fitted inside one side wall of the tube end sleeve. A locking square rod is fixed at one end of the wedge pin tube near the return spring. The locking square rod passes through one end of the wedge pin tube and extends into the tube end sleeve. The locking component is connected to the locking square rod in a transmission manner.
[0008] A further feature of this invention is that the locking assembly includes a locking pin, a locking pin tube, and a compression spring. The locking pin tube is sleeved through the side wall of the tube end sleeve, and the open end face of the locking pin tube is attached to the rod surface of the locking square rod. The locking pin is slidably sleeved inside the locking pin tube, and the compression spring is sleeved inside the locking pin tube. The two ends of the compression spring are respectively fixedly connected to the end face of the locking pin and the inner top surface of the closed end of the locking pin tube. A locking hole is provided through the rod surface of the locking square rod, and the locking hole matches the locking pin.
[0009] A further feature of this invention is that the end face of the locking pin away from the compression spring is hemispherical.
[0010] A further feature of this invention is that the end of the tube sleeve away from the wedge pin tube has a through hole for a locking square rod, and one end of the locking square rod is slidably sleeved in the through hole for the locking square rod.
[0011] A further feature of this invention is that a bearing is fitted onto the outer wall of the sleeve post, a bearing hoop is fixedly fitted onto the outer wall of the bearing, and the outer wall of the bearing hoop is threadedly engaged with the inner wall of the adapter sleeve.
[0012] A further feature of this invention is that a gripping sleeve is fixedly provided on the end face of the bearing hoop away from the square column, and the gripping sleeve is sleeved on the outside of the drive shaft.
[0013] This utility model has the following beneficial effects:
[0014] 1. This utility model fixes a square column to the end face of the sleeve column at one end of the drive shaft and a transition sleeve to one end of the driven shaft. The transition sleeve is fitted on the outside of the square column. A set of wedge-face pin tubes are circumferentially arrayed and sleeved through the side wall of the transition sleeve. A set of wedge-face pins are slidably sleeved in the wedge-face pin tubes. The wedge surface of the wedge-face pins is made to fit with the wedge-face teeth on the side of the square column. When the drive shaft rotates, the wedge-face teeth push the wedge-face pins, thereby causing the driven shaft to rotate with the drive shaft.
[0015] 2. When one end of the driven shaft of this utility model is jammed, the wedge surface of the wedge tooth pushes the wedge pin into the wedge pin tube, causing the wedge pin to squeeze the return spring in the wedge pin tube, causing the wedge pin to disengage from the wedge tooth, allowing the square column to continue rotating in the adapter sleeve. This allows the drive shaft to continue rotating even when the driven shaft is jammed due to overload, thus preventing motor overload. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is an exploded view of an overload protection linkage shaft.
[0018] Figure 2 This is a cross-sectional view of the adapter sleeve and the wedge pin tube.
[0019] Figure 3 This is an exploded view of the adapter sleeve and the wedge pin.
[0020] Figure 4 This is a side sectional view of the locking assembly and the wedge pin tube.
[0021] Figure 5 This is an exploded view of the bearing and drive shaft.
[0022] The attached diagram lists the components represented by each number as follows:
[0023] 1-Drive shaft, 101-Sleeve post, 101a-Bearing, 101b-Bearing clamp, 101b-1-Holding sleeve, 102-Square post, 102a-Wedge tooth, 2-Driven shaft, 201-Adapter sleeve, 202-Wedge pin tube, 202a-Wedge pin, 202a-1-Locking square rod, 202a-2-Locking hole, 202b-Return spring, 202c-Tube end sleeve, 202c-1-Locking square rod through hole, 202d-Locking assembly, 202d-1-Locking pin, 202d-2-Locking pin tube, 202d-3-Compression spring. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0025] Example 1
[0026] Please see Figures 1 to 4This utility model is an overload protection linkage shaft, including a driving shaft 1 and a driven shaft 2. A square post 102 is fixed to the end face of the sleeve post 101 at one end of the driving shaft 1, and an adapter sleeve 201 is fixed to one end of the driven shaft 2. The adapter sleeve 201 is sleeved on the outside of the square post 102. A set of wedge-face pin tubes 202 are circumferentially arrayed through the side wall of the adapter sleeve 201. A set of wedge-face pins 202a are slidably sleeved inside the wedge-face pin tubes 202, so that the wedge surface of the wedge-face pins 202a is in contact with the wedge-face teeth 102a on the side of the square post 102. When the driving shaft 1 rotates... The wedge teeth 102a push the wedge pin 202a, causing the driven shaft 2 to rotate with the driving shaft 1. When one end of the driven shaft 2 is jammed, the wedge surface of the wedge teeth 102a pushes the wedge pin 202a into the wedge pin tube 202, causing the wedge pin 202a to squeeze the return spring 202b inside the wedge pin tube 202, causing the wedge pin 202a to disengage from the wedge teeth 102a, allowing the square column 102 to continue rotating within the adapter sleeve 201. This allows the driving shaft 1 to continue rotating even when the driven shaft 2 is jammed due to overload, thus preventing motor overload.
[0027] Specifically, a sleeve post 101 is fixedly provided on one end face of the drive shaft 1, and a square post 102 is fixedly provided on the end face of the sleeve post 101. Wedge teeth 102a are fixedly provided on the four sides of the square post 102. A transition sleeve 201 is fixedly provided on one end of the driven shaft 2. The transition sleeve 201 is rotatably sleeved on the outside of the square post 102. A wedge pin tube 202 is circumferentially arrayed and sleeved through the side wall of the transition sleeve 201. A wedge pin 202a is slidably sleeved inside the wedge pin tube 202. The wedge surface of the wedge pin 202a is attached to the wedge surface of the wedge teeth 102a. A return spring 202b is sleeved inside the wedge pin tube 202. The two ends of the return spring 202b are fixedly connected to the end face of the wedge pin 202a and the inner top surface of the wedge pin tube 202, respectively.
[0028] Furthermore, one end of the wedge pin tube 202 that passes through the side wall of the adapter sleeve 201 is fitted with a tube end sleeve 202c. A locking component 202d is fitted inside one side wall of the tube end sleeve 202c. A locking square rod 202a-1 is fixed at one end of the wedge pin 202a near the return spring 202b. The locking square rod 202a-1 passes through one end of the wedge pin tube 202 and extends into the tube end sleeve 202c. The locking component 202d is connected to the locking square rod 202a-1 in a transmission connection. When the wedge pin 202a is squeezed and pushes the return spring 202b backward, the locking square rod 202a-1 slides backward until the locking component locks the locking square rod 202a-1, thereby preventing the wedge pin 202a from being pushed to the side of the square post 102 under the pressure of the return spring 202b, which would prevent the square post 102 from rotating.
[0029] Furthermore, the locking assembly 202d includes a locking pin 202d-1, a locking pin tube 202d-2, and a compression spring 202d-3. The locking pin tube 202d-2 is sleeved through and fitted onto the side wall of the tube end sleeve 202c. The open end face of the locking pin tube 202d-2 is attached to the rod surface of the locking square rod 202a-1. The locking pin 202d-1 is slidably sleeved inside the locking pin tube 202d-2. The compression spring 202d-3 is sleeved inside the locking pin tube 202d-2, and both ends of the compression spring 202d-3 are fixedly connected to the end face of the locking pin 202d-1 and the locking pin tube 202d-2, respectively. On the inner top surface of the closed end of 2d-2, a locking hole 202a-2 is provided through the rod surface of the locking square rod 202a-1. The locking hole 202a-2 matches the locking pin 202d-1. When the wedge pin 202a is squeezed and pushes back the spring 202b, the locking square rod 202a-1 slides backward until the locking hole 202a-2 and the locking pin 202d-1 are connected. The locking pin 202d-1 is pushed into the locking hole 202a-2 under the action of the compression spring 202d-3, thereby preventing the wedge pin 202a from being pushed back to the side of the square post 102 and causing the square post 102 to jam.
[0030] Furthermore, the end face of the locking pin 202d-1 away from the compression spring 202d-3 is hemispherical.
[0031] Furthermore, the end of the tube end sleeve 202c away from the wedge pin tube 202 has a through hole 202c-1 for locking square rod, and one end of the locking square rod 202a-1 is slidably sleeved in the through hole 202c-1.
[0032] The operation process in this embodiment is as follows:
[0033] The output end of the motor is fixed to one end of the drive shaft 1. When the motor drives the drive shaft 1 to rotate, the wedge teeth 102a push the wedge pin 202a, causing the driven shaft 2 to rotate with the drive shaft 1, thus completing the transmission. When one end of the driven shaft 2 is jammed, the drive shaft 1 continues to rotate under the drive of the motor, causing the wedge surface of the wedge teeth 102a on the side of the square post 102 to push the wedge pin 202a into the wedge pin tube 202, causing the wedge pin 202a to press the return spring 202b inside the wedge pin tube 202, thus disengaging the wedge pin 202a from the wedge teeth 102a. When the wedge pin 202a is pressed and pushes the return spring 202b backward, the locking square post 202a is engaged. 1. Slide backward until the locking hole 202a-2 aligns with the locking pin 202d-1. The locking pin 202d-1 is pushed into the locking hole 202a-2 under the action of the compression spring 202d-3, thereby preventing the wedge pin 202a from being pushed back to the side of the square post 102 and causing the square post 102 to jam. When the wedge pin 202a is locked by the locking component 202d after it disengages from the wedge tooth 102a, the wedge tooth 102a on the side of the square post 102 no longer contacts the wedge pin 202a, so that the square post 102 can continue to rotate in the adapter sleeve 201, and the drive shaft 1 can continue to rotate under the drive of the motor. At the same time, the transmission connection with the driven shaft 2 is disconnected to avoid motor overload.
[0034] Example 2
[0035] Please see Figures 1 to 5 Based on embodiment 1, by attaching a bearing 101a to the outside of the sleeve post 101, the bearing 101a is connected to the adapter sleeve 201 at one end of the driven shaft 2, so that one end of the driving shaft 1 is connected to one end of the driven shaft 2, while not transmitting rotation between them.
[0036] Specifically, a bearing 101a is sleeved on the outer wall of the sleeve post 101, a bearing hoop 101b is fixedly sleeved on the outer wall of the bearing 101a, and the outer wall of the bearing hoop 101b is threadedly screwed into the inner wall of the adapter sleeve 201.
[0037] Furthermore, a gripping sleeve 101b-1 is fixedly provided on the end face of the bearing hoop 101b away from the square column 102, and the gripping sleeve 101b-1 is sleeved on the outside of the drive shaft 1.
[0038] The operation process in this embodiment is as follows:
[0039] When connecting the drive shaft 1 and the driven shaft 2, grip the holding sleeve 101b-1 tightly, and rotate the adapter sleeve 201 at one end of the driven shaft 2 onto the outside of the bearing hoop 101b, so that the drive shaft 1 and the driven shaft 2 are connected; when one end of the driven shaft 2 is stuck, the drive shaft 1 and the driven shaft 2 are disconnected from the transmission connection, the drive shaft 1 continues to rotate, the bearing 101a bears the radial load, maintains the alignment of the shaft system, and prevents the motor at one end of the drive shaft 1 from being overloaded.
[0040] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
Claims
1. An overload protection linkage shaft, comprising a driving shaft (1) and a driven shaft (2), characterized in that: One end face of the drive shaft (1) is fixed with a sleeve post (101), and the end face of the sleeve post (101) is fixed with a square post (102). The four sides of the square post (102) are respectively fixed with wedge teeth (102a). One end of the driven shaft (2) is fixed with a transition sleeve (201). The transition sleeve (201) is rotatably sleeved on the outside of the square post (102). The sidewalls of the transition sleeve (201) are circumferentially arrayed with... A wedge-shaped pin tube (202) is sleeved through the tube, and a wedge-shaped pin (202a) is slidably sleeved inside the wedge-shaped pin tube (202). The wedge surface of the wedge-shaped pin (202a) is in contact with the wedge surface of the wedge-shaped tooth (102a). A return spring (202b) is sleeved inside the wedge-shaped pin tube (202). The two ends of the return spring (202b) are respectively fixedly connected to the end face of the wedge-shaped pin (202a) and the inner top surface of the wedge-shaped pin tube (202).
2. The overload protection linkage shaft according to claim 1, characterized in that: The wedge pin tube (202) passes through one end of the side wall of the adapter sleeve (201) and is fitted with a tube end sleeve (202c). A locking component (202d) is fitted inside one side wall of the tube end sleeve (202c). A locking square rod (202a-1) is fixed at one end of the wedge pin (202a) near the return spring (202b). The locking square rod (202a-1) passes through one end of the wedge pin tube (202) and extends into the tube end sleeve (202c). The locking component (202d) is connected to the locking square rod (202a-1) in a driving connection.
3. The overload protection linkage shaft according to claim 2, characterized in that: The locking assembly (202d) includes a locking pin (202d-1), a locking pin tube (202d-2), and a compression spring (202d-3). The locking pin tube (202d-2) is sleeved through the side wall of the tube end sleeve (202c). The open end face of the locking pin tube (202d-2) is in contact with the rod surface of the locking square rod (202a-1). The locking pin (202d-1) is slidably sleeved on the locking pin tube (202d-2). Inside, the compression spring (202d-3) is sleeved inside the locking pin tube (202d-2). The two ends of the compression spring (202d-3) are respectively fixedly connected to the end face of the locking pin (202d-1) and the inner top surface of the closed end of the locking pin tube (202d-2). A locking hole (202a-2) is provided through the rod surface of the locking square rod (202a-1), and the locking hole (202a-2) matches the locking pin (202d-1).
4. The overload protection linkage shaft according to claim 3, characterized in that: The end face of the locking pin (202d-1) away from the compression spring (202d-3) is hemispherical.
5. The overload protection linkage shaft according to claim 4, characterized in that: The end of the tube end sleeve (202c) away from the wedge pin tube (202) is provided with a locking square rod through hole (202c-1), and one end of the locking square rod (202a-1) is slidably sleeved in the locking square rod through hole (202c-1).
6. The overload protection linkage shaft according to claim 1, characterized in that: The outer wall of the sleeve post (101) is fitted with a bearing (101a), and the outer wall of the bearing (101a) is fixedly fitted with a bearing hoop (101b). The outer wall of the bearing hoop (101b) is threadedly engaged with the inner wall of the adapter sleeve (201).
7. The overload protection linkage shaft according to claim 6, characterized in that: A gripping sleeve (101b-1) is fixedly provided on the end face of the bearing hoop (101b) away from the square column (102), and the gripping sleeve (101b-1) is sleeved on the outside of the drive shaft (1).