A connection structure between a motor shaft and an eccentric shaft of a PPU manipulator
By using a tight fit structure for the motor shaft and eccentric shaft connection structure of the PPU robot, the problem of unstable connection in the prior art is solved, and a more stable and reliable connection effect is achieved.
Patent Information
- Application Number
- CN202421508836.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The motor shaft and eccentric shaft connection structure of the existing PPU robots has the risk of instability when the motor is frequently forward and reversed, especially when the keys and keyways are coordinated, there is a certain gap in multiple forward and reversed rotations.
A motor shaft and an eccentric shaft connection structure is designed. By installing an expansion sleeve in the eccentric through hole, the expansion sleeve is equipped with an expansion and tightening hole and a gap groove. The motor shaft is equipped with a threaded hole. When tightening the screw, the gap groove is enlarged, and the expansion sleeve expands and tightens the inner wall of the eccentric through hole, so that the motor shaft, expansion sleeve and eccentric shaft are connected integrally.
The stable and reliable connection between the motor shaft and the eccentric shaft is achieved, which meets the installation requirements in a narrow space and avoids the risk of unstable connection.
Smart Images
Figure CN222697222U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of mechanical equipment, in particular to a connection structure of a motor shaft and an eccentric shaft of a PPU manipulator. Background Art
[0002] In the prior art, the connection structure between the motor shaft and the eccentric shaft of the PPU manipulator is directly connected by the cooperation of the key and the keyway. For the situation where the motor frequently rotates forward and reverse, this connection method has only a single connection structure, and there is a certain gap between the multiple forward and reverse rotations, which poses a risk of unstable connection. Utility Model Content
[0003] In view of the above-mentioned defects in the prior art, the utility model provides a connection structure between the motor shaft and the eccentric shaft of a PPU manipulator, and the specific technical solution is as follows:
[0004] A motor shaft and eccentric shaft connection structure of a PPU manipulator comprises a motor shaft and an eccentric shaft, wherein the eccentric shaft is provided with an eccentric through hole for inserting the motor shaft, and the motor shaft drives the eccentric shaft to rotate by the cooperation of a key and a keyway, an expansion sleeve is installed in the eccentric through hole, the expansion sleeve is provided with an expansion hole and a clearance groove, and the motor shaft is provided with a threaded hole, the expansion hole and the threaded hole are coaxially arranged, and the clearance groove is enlarged when the screw is tightened; the expansion sleeve expands the inner wall of the eccentric through hole to connect the motor shaft, the expansion sleeve and the eccentric shaft as a whole.
[0005] As a preferred solution of the utility model, the motor shaft and the eccentric shaft are provided with keyways, and the keys are inserted into the keyways.
[0006] As a preferred solution of the utility model, the expansion sleeve consists of a cylindrical part and a boss part, the expansion hole is arranged on the cylindrical part, the clearance groove is arranged on the boss part, the expansion hole is connected to the clearance groove, and when tightening the screw, the boss part expands the keyway and the cylindrical part expands the eccentric through hole.
[0007] As a preferred solution of the utility model, a tapered groove is provided at the front end of the expansion hole.
[0008] As a preferred solution of the utility model, the internal shape of the eccentric through hole matches the cylindrical part and the boss part.
[0009] Beneficial effect: The motor shaft and eccentric shaft connection structure of the PPU manipulator of the utility model adds a tight fitting structure of an expansion sleeve on the basis of the existing keyway installation structure. When the screw is tightened into the screw hole, the screw will stretch the expansion sleeve to increase the gap groove; the expansion sleeve expands the inner wall of the eccentric through hole to connect the motor shaft, expansion sleeve and eccentric shaft into one, and the connection is firm and reliable. The ingeniously designed expansion sleeve structure can meet the installation requirements of the motor shaft and eccentric shaft of the PPU manipulator in a narrow space. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a three-dimensional diagram of the utility model;
[0011] Figure 2 It is an exploded view of the utility model;
[0012] Figure 3 It is the front view of the utility model;
[0013] Figure 4 yes Figure 3 Sectional view in the AA direction;
[0014] Figure 5 It is a three-dimensional diagram of the expansion sleeve of the utility model;
[0015] Figure 6 It is a usage status diagram of the utility model. DETAILED DESCRIPTION
[0016] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings:
[0017] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have specific directions, be constructed and operated in specific directions. Therefore, they cannot be understood as limitations on the present invention.
[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.
[0019] like Figures 1 to 5As shown, a motor shaft and eccentric shaft connection structure of a PPU manipulator includes a motor shaft 1 and an eccentric shaft 2. The motor shaft 1 is arranged on a motor 3 and driven to rotate by the motor 3. The eccentric shaft 2 is provided with an eccentric through hole 4 for the motor shaft 1 to be inserted. The motor shaft 1 drives the eccentric shaft 2 to rotate by the cooperation of a key and a keyway. An expansion sleeve 5 is installed in the eccentric through hole 4. The expansion sleeve 5 is provided with an expansion hole 6 and a clearance groove 7. The motor shaft 1 is provided with a threaded hole 8. The threaded hole 8 is provided with an internal thread. The expansion hole 6 is coaxially arranged with the threaded hole 8. When the screw (not shown) is tightened, the clearance groove 7 will be enlarged; the expansion sleeve 5 expands the inner wall of the eccentric through hole to connect the motor shaft 1, the expansion sleeve 5, and the eccentric shaft 2 as a whole.
[0020] The motor shaft 1 and the eccentric shaft 2 are provided with keyways by means of the key and the keyway, and the key 9 is inserted into the keyway to realize that the motor shaft 1 drives the eccentric shaft 2 to rotate by means of the key and the keyway.
[0021] like Figure 5 As shown, the expansion sleeve 5 is composed of a cylindrical portion 10 and a boss portion 11, the expansion hole 6 is arranged on the cylindrical portion 10, the clearance groove 7 is arranged on the boss portion 11, the expansion hole 6 is connected to the clearance groove 7, and when the screw is tightened, the boss portion 11 expands the inner wall of the keyway, and the cylindrical portion 10 expands the inner wall of the eccentric through hole 4. Specifically, a tapered groove 12 is provided at the front end of the expansion hole 6. Since the tapered groove 12 is larger at the front and smaller at the back, as the screw gradually extends into the tapered groove 12, the expansion sleeve 5 will expand, and the internal shape of the eccentric through hole 4 matches the cylindrical portion 10 and the boss portion 11.
[0022] Working principle: Figure 6 As shown, when the motor shaft and eccentric shaft connection structure is applied to the PPU manipulator, the motor 3 is installed behind the fixed plate 13, and the motor shaft 1 extends forward into the eccentric through hole 4. After the screw is passed through the expansion hole 6 and screwed into the screw hole 8 from the front, in the process of gradually tightening the screw, the screw passes through the tapered groove 12 and the expansion hole 6 to expand the expansion sleeve 5. After the screw is tightened into place, the gap groove increases, and the expansion sleeve 5 expands the inner wall of the eccentric through hole to connect the motor shaft 1, the expansion sleeve 5, and the eccentric shaft 2 as a whole.
[0023] The above content is a further detailed description of the utility model in combination with specific preferred implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the protection scope of the utility model.
Claims
1. A motor shaft and eccentric shaft connection structure of a PPU manipulator, comprising a motor shaft and an eccentric shaft, wherein the eccentric shaft is provided with an eccentric through hole for the motor shaft to be inserted, and the motor shaft drives the eccentric shaft to rotate by the cooperation of a key and a keyway, and is characterized in that: An expansion sleeve is installed in the eccentric through hole, the expansion sleeve is provided with an expansion hole and a clearance groove, the motor shaft is provided with a threaded hole, the expansion hole and the threaded hole are coaxially arranged, and the clearance groove will be enlarged when the screw is tightened; the expansion sleeve expands the inner wall of the eccentric through hole to connect the motor shaft, the expansion sleeve and the eccentric shaft into one.
2. The motor shaft and eccentric shaft connection structure of a PPU manipulator according to claim 1, characterized in that: The motor shaft and the eccentric shaft are provided with keyways, and the keys are inserted into the keyways.
3. The motor shaft and eccentric shaft connection structure of a PPU manipulator according to claim 2, characterized in that: The expansion sleeve is composed of a cylindrical part and a boss part, the expansion hole is arranged in the cylindrical part, the clearance groove is arranged in the boss part, the expansion hole is connected to the clearance groove, and when the screw is tightened, the boss part expands the key groove and the cylindrical part expands the eccentric through hole.
4. The motor shaft and eccentric shaft connection structure of a PPU manipulator according to claim 1 or 3, characterized in that: A tapered groove is provided at the front end of the expansion hole.
5. The motor shaft and eccentric shaft connection structure of a PPU manipulator according to claim 3, characterized in that: The inner shape of the eccentric through hole matches the cylindrical part and the boss part.