End cover assembly of a servo motor

Abstract

The present invention discloses an end cover assembly of a servo motor, comprising a motor end cover and a surrounding sealing assembly; an axial hole is provided on the motor end cover. The surrounding sealing assembly comprises a friction block, a first driving member, and a second driving member; four friction blocks are respectively arranged at four corners of a virtual rectangle formed around the axial hole; four friction blocks enclose to form an interlaced space; the interlaced space has a continuous circumferential sealing surface; the first driving member has an active state of moving along a preset direction under the action of its own gravity, and has an active driving state of driving the friction blocks on the two wide sides of the virtual rectangle to move closer to each other in the active state; the second driving member has a passive driving state of driving the friction blocks on the two long sides of the virtual rectangle to move closer to each other in the active driving state. The present invention can achieve complete sealing of the connection between the end cover and the central shaft of the servo motor, and effectively prevent oil, dust, rainwater, etc. from entering the interior of the servo motor.

Description

Technical Field

[0001] The invention relates to the technical field of servo motors, and in particular to an end cover assembly of a servo motor. Background Art

[0002] like Figure 1 The figure shows a conventional servo motor installation structure diagram. The central shaft 2 of the servo motor is inserted into the motor end cover 1. A skeleton oil seal is installed between the central shaft 2 and the motor end cover 1 to play a sealing role. In the above structure, a gap is formed between the motor end cover 1 and the central shaft 2. Oil, dust, rainwater, etc. can easily contact the skeleton oil seal 3 through the gap. Under long-term erosion by oil, dust, rainwater, etc., the skeleton oil seal 3 is very easy to age and lose its sealing performance, which reduces the service life of the skeleton oil seal 3. Summary of the invention

[0003] In view of the above-mentioned technical problems, the purpose of the present invention is to propose an end cover assembly of a servo motor, which can achieve complete sealing of the connection between the end cover and the center shaft of the servo motor, effectively prevent oil, dust, rainwater, etc. from entering the interior of the servo motor, so as to better protect the skeleton oil seal and other components inside the servo motor.

[0004] The technical solution of the present invention is achieved as follows: an end cover assembly of a servo motor includes a motor end cover and a surrounding sealing assembly;

[0005] The motor end cover has an outer end surface and an axial hole formed on the outer end surface;

[0006] The surrounding sealing assembly is arranged on the outer end surface of the motor end cover, and includes a friction block, a first driving member, and a second driving member;

[0007] The four friction blocks are respectively arranged at the four corners of a virtual rectangle formed around the shaft hole, and each can move along the long side direction and the wide side direction of the virtual rectangle; the four friction blocks enclose an interlaced space; the interlaced space has an assembly center axis that coincides with the center axis of the shaft hole, and has a continuous circumferential sealing surface formed around the assembly center axis;

[0008] The first driving member is arranged on the end cover, and has an active state of moving along a preset direction under the action of its own gravity, and an active driving state of driving the friction blocks on the two wide sides of the virtual rectangle to move along the long side direction of the virtual rectangle and approach each other in the active state;

[0009] The second driving member is fixed on the end cover and has a passive driving state in which the friction blocks on the two long sides of the virtual rectangle are driven to move along the wide side direction of the virtual rectangle and move closer to each other in the active driving state.

[0010] Furthermore, two adjacent friction blocks are plugged into and matched with each other in the relative position direction.

[0011] Furthermore, the friction block is respectively docked with two adjacent friction blocks to form two docking ends; a slot is provided on one of the docking ends of the friction block, and a plug-in protrusion that is plugged into and matched with the slot is provided on the other docking end; the slots and plug-in protrusions on the two adjacent friction blocks are plug-fitted into each other.

[0012] Furthermore, the friction block is made of a wear material that can contact and wear against the central axis of the servo motor.

[0013] Furthermore, the first driving member is wedge-fittedly connected to the friction blocks on the two wide sides of the virtual rectangle through a first wedge-fitting structure; the first wedge-fitting structure includes a first wedge-shaped member arranged on the four friction blocks and a first wedge-fitting member arranged on the first driving member and slidingly fitted with the first wedge-shaped member; the first wedge-shaped members on the two friction blocks on each wide side of the virtual rectangle have wedge surfaces parallel to each other.

[0014] Furthermore, a counterweight is provided on the first driving member.

[0015] Furthermore, the second driving member is wedge-fittedly connected to the friction blocks on the two long sides of the virtual rectangle through a second wedge-fitting structure; the second wedge-fitting structure includes a second wedge-shaped member arranged on the four friction blocks and a second wedge-fitting member arranged on the second driving member and slidingly fitted with the second wedge-shaped member; the second wedge members on the two friction blocks on each long side of the virtual rectangle have symmetrically arranged wedge surfaces.

[0016] Furthermore, the virtual rectangle is a square; four L-shaped wire grooves are arranged on the outer end surface of the end cover in a mirror-symmetrical manner in the two diagonal directions of the virtual rectangle; the first driving member is detachably and movably inserted in the vertical groove of the L-shaped wire groove; the second driving member is detachably inserted and fixed in the horizontal groove of the L-shaped wire groove.

[0017] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0018] 1. The present invention uses a surrounding seal assembly, and the continuous circumferential sealing surface formed by the four friction blocks can be completely fitted with the central axis to completely seal the gap between the end cover and the central axis, effectively preventing oil, dust, rainwater, etc. from entering the interior of the servo motor, so as to better protect the skeleton oil seal and other parts inside the servo motor. When the friction block contacts and wears the central axis, the first drive member and the second drive member can drive the four friction blocks to move closer to each other, so as to always maintain the contact and sealing between the four friction blocks and the central axis, which is highly practical.

[0019] 2. In the present invention, the first driving member forms a constant driving force under the action of its own gravity and with the cooperation of the second driving member, so that the pressure applied to the central axis by the four friction blocks is uniform and consistent, and the degree of wear of the four friction blocks is uniform and consistent. There will be no situation where some friction blocks are lightly worn and some friction blocks are heavily worn, thereby effectively improving the durability of the friction blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 It is an assembly structure diagram of a servo motor in the prior art;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of the overall structure of the present invention;

[0023] Figure 3 It is a schematic diagram of the assembly of the electrode end cap and the surrounding sealing assembly of the present invention;

[0024] Figure 4 It is a schematic diagram of the three-dimensional structure of the surrounding sealing assembly of the present invention;

[0025] Figure 5 for Figure 4 A side view structural schematic diagram of

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the friction block of the present invention;

[0027] Among them: 1. Motor end cover; 11. Outer end face; 12. Shaft hole; 13. L-shaped wire groove; 2. Central shaft; 3. Skeleton oil seal; 4. Surrounding seal assembly; 5. Friction block; 51. First wedge-shaped piece; 52. Second wedge-shaped piece; 53. Insertion protrusion; 54. Slot; 6. First driving piece; 61. First wedge-shaped matching piece; 7. Counterweight; 8. Second driving piece; 81. Second wedge-shaped matching piece; 9. Interlaced space; 91. Circumferential sealing surface; 92. Virtual rectangle. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0029] like Figure 2-6 The end cover assembly of a servo motor described in this embodiment is shown. The end cover assembly is a component of the servo motor, including a motor end cover 1 and a surrounding seal assembly 4. The motor end cover 1 is connected to the main body of the servo motor by bolting. After the motor end cover 1 is assembled, an outer end face 11 facing the outside of the servo motor is formed, and an axial hole 12 is formed on the outer end face 11. One end of the central axis 2 of the servo motor can pass through the axial hole 12. After assembly, a gap is formed between the central axis 2 and the axial hole 12.

[0030] The aforementioned surrounding seal assembly 4 is installed on the outer end face 11 of the motor end cover 1 to seal the aforementioned gap. The surrounding seal assembly 4 includes a friction block 5, a first drive member 6, and a second drive member 8. The four friction blocks 5 are respectively arranged at the four corners of a virtual rectangle 92 formed around the shaft hole 12, and each can move along the long side direction and the wide side direction of the virtual rectangle 92. The center of the aforementioned virtual rectangle 92 is located on the center axis 2 line of the shaft hole 12. The virtual rectangle 92 is formed on the outer end face 11 of the motor end cover 1 or on a plane parallel to the outer end face 11 of the motor end cover 1.

[0031] In this embodiment, the long side of the virtual rectangle 92 is defined to extend in the left-right direction on the horizontal plane, and the wide side of the virtual rectangle 92 is defined to extend in the up-down direction.

[0032] The aforementioned four friction blocks 5 enclose an interpenetrating space 9. The interpenetrating space 9 has an assembly center axis 2 line that coincides with the center axis 2 line of the shaft hole 12, and a continuous circumferential sealing surface 91 formed around the assembly center axis 2 line. In this embodiment, in the initial state, the diameter of the circumferential sealing surface 91 is designed to match the outer diameter of the center axis 2 of the servo motor. Through the above structural design, the center axis 2 of the servo motor can be synchronously inserted into the interpenetrating space 9, and the circumferential sealing surface 91 can be in sealing contact with the center axis 2 of the servo motor.

[0033] In this embodiment, the aforementioned virtual rectangle 92 is a square. Four L-shaped wire grooves 13 are fixedly installed on the outer end surface 11 of the end cover in a mirror-symmetrical manner in the two diagonal directions of the virtual rectangle 92. A vertical groove extending up and down and a horizontal groove extending left and right are formed on the outer end surface 11 of the motor end cover 1 between the four L-shaped wire grooves 13. The first driving member 6 is installed on the motor end cover 1 and is located on the left and right sides of the virtual rectangle 92. The first driving member 6 is detachably inserted into the vertical groove of the L-shaped wire groove 13 so as to be able to move in the vertical direction. A counterweight body 7 is installed on the first driving member 6 to have a designed weight. The first driving member 6 has an active state of moving along a preset direction under the action of its own gravity. In this embodiment, the preset direction is the direction of moving toward the lower side of the vertical direction. The first driving member 6 has an active driving state in which the friction blocks 5 (the two friction blocks 5 on the left and right sides) on the two wide sides of the virtual rectangle 92 are driven to move along the long side direction of the virtual rectangle 92 and move closer to each other in the active state.

[0034] Specifically, the first driving member 6 is wedge-fittedly connected to the friction blocks 5 on the two wide sides of the virtual rectangle 92 through a first wedge-fitting structure. The first wedge-fitting structure includes a first wedge 51 arranged on the four friction blocks 5 and a first wedge-fitting member 61 arranged on the first driving member 6 and slidingly matched with the first wedge 51. The number of the first wedge-fitting members 61 matches the number of the first wedge-fitting members 51. In the specific design, the first wedge members 51 on the two friction blocks 5 on each wide side of the virtual rectangle 92 have wedge surfaces parallel to each other, and the wedge surfaces on the friction blocks 5 on the two wide sides of the virtual rectangle 92 are arranged symmetrically on the left and right. Through the above structural design, when the first driving member 6 moves downward as a whole, the first wedge-fitting member 61 slides and cooperates with the first wedge members 51 on each friction member to drive the friction member to move accordingly.

[0035] The aforementioned second driving member 8 is fixed on the end cover, which is arranged on the upper and lower sides of the virtual rectangle 92, and is detachably plugged and fixed in the transverse groove of the L-shaped wire groove 13. The second driving member 8 has a passive driving state in which the friction blocks 5 on the two long sides of the virtual rectangle 92 are driven to move along the wide side direction of the virtual rectangle 92 and approach each other in an active driving state. Specifically, the second driving member 8 and the friction blocks 5 on the two long sides of the virtual rectangle 92 are wedge-fittedly connected through a second wedge-fitting structure. The second wedge-fitting structure includes a second wedge-shaped member 52 arranged on four friction blocks 5 and a second wedge-shaped fitting member 81 arranged on the second driving member 8 and slidingly fitted with the second wedge-shaped member 52. The number of the second wedge-shaped fitting members 81 corresponds to the number of the second wedge-shaped members 52. The second wedge-shaped members 52 on the two friction blocks 5 on each long side of the virtual rectangle 92 have wedge surfaces that are symmetrically arranged, that is, the two wedge surfaces have first ends that are close to each other, and second ends that are far away from each other, forming a structure similar to an "eight" shape. Through the above structural design, when the friction blocks 5 on the left and right sides (friction blocks 5 on the two wide sides) are close to each other, the second wedge-shaped member 52 and the second wedge-shaped matching member 81 slide and match with each other to force the friction blocks 5 on the upper and lower sides to move closer to each other.

[0036] In this embodiment, the four friction blocks 5 are made of abrasive materials that can contact and wear the central axis 2 of the servo motor, and can be made of various materials such as rubber and plastic. Among the four friction blocks 5, two adjacent friction blocks 5 are plugged and matched with each other in the relative position direction to achieve movement along the long side and wide side of the virtual rectangle 92. Specifically, the friction block 5 is docked with two adjacent friction blocks 5 respectively to form two docking ends; a slot 54 is provided on one of the docking ends of the friction block 5, and a plug-in protrusion 53 that is plugged and matched with the slot 54 is provided on the other docking end. The slots 54 and the plug-in protrusions 53 on the two adjacent friction blocks 5 are plugged and matched with each other.

[0037] It should be noted that, in order to realize the gravity effect of the first driving member 6, the motor end cover 1 of the servo motor of this embodiment needs to be arranged in a vertical posture after being installed and fixed. By adjusting the positions of the first driving member 6 and the second driving member 8 in the L-shaped groove, it is possible to adapt to the installation requirements when the four sides of the motor end cover 1 are in different directions of up, down, left, and right.

[0038] When in use, the four friction blocks 5 are distributed on the outside of the central axis 2 of the servo motor, and the first drive member 6 and the second drive member 8 are respectively inserted into the corresponding positions of the L-shaped wire groove 13, so that the four friction blocks 5 are limited around the central axis 2. The continuous circumferential sealing surface 91 formed by the four friction blocks 5 can be completely fitted with the central axis 2 to completely seal the gap between the end cover and the central axis 2. When the friction blocks 5 are in contact with the central axis 2 and wear, the first drive member 6 drives the friction blocks 5 on the left and right sides to move closer together under the action of its own gravity. When the friction blocks 5 on the left and right sides move closer together, with the cooperation of the second drive member 8, the friction blocks 5 on the upper and lower sides move closer to each other, so that the four friction blocks 5 can always maintain contact and sealing with the central axis 2, effectively preventing oil, dust, rainwater, etc. from entering the interior of the servo motor, so as to better protect the skeleton oil seal 3 and other components inside the servo motor. In the above structural design, the first driving member 6 forms a constant driving force under the action of its own gravity and the cooperation of the second driving member 8, so that the pressure applied to the central shaft 2 by the four friction blocks 5 is uniform and consistent, and the degree of wear of the four friction blocks 5 is uniform and consistent. There will be no situation where some friction blocks 5 are lightly worn and some friction blocks 5 are heavily worn, so as to effectively improve the durability of the friction blocks 5.

[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An end cover assembly of a servo motor, comprising a motor end cover and a surrounding sealing assembly; characterized in that: The motor end cover has an outer end surface and an axial hole formed on the outer end surface; The surrounding sealing assembly is arranged on the outer end surface of the motor end cover, and includes a friction block, a first driving member, and a second driving member; The four friction blocks are respectively arranged at the four corners of a virtual rectangle formed around the shaft hole, and each can move along the long side direction and the wide side direction of the virtual rectangle; the four friction blocks enclose an interlaced space; the interlaced space has an assembly center axis that coincides with the center axis of the shaft hole, and has a continuous circumferential sealing surface formed around the assembly center axis; The first driving member is arranged on the end cover, and has an active state of moving along a preset direction under the action of its own gravity, and an active driving state of driving the friction blocks on the two wide sides of the virtual rectangle to move along the long side direction of the virtual rectangle and approach each other in the active state; The second driving member is fixed on the end cover and has a passive driving state in which the friction blocks on the two long sides of the virtual rectangle are driven to move along the wide side direction of the virtual rectangle and move closer to each other in the active driving state.

2. The end cover assembly of a servo motor according to claim 1, characterized in that: Two adjacent friction blocks are plug-fitted to each other in the relative position direction.

3. The end cover assembly of a servo motor according to claim 1, characterized in that: The friction block is butted against two adjacent friction blocks respectively to form two butt ends; a slot is provided on one of the butt ends of the friction block, and a plug-in protrusion that plugs into and matches the slot is provided on the other butt end; the slots and plug-in protrusions on the two adjacent friction blocks are plug-in matched with each other.

4. The end cover assembly of a servo motor according to claim 1, characterized in that: The friction block is made of a wear material that can contact and wear the central shaft of the servo motor.

5. The end cover assembly of a servo motor according to claim 1, characterized in that: The first driving member is wedge-fittedly connected to the friction blocks on the two wide sides of the virtual rectangle through a first wedge-fitting structure; the first wedge-fitting structure includes a first wedge-shaped member arranged on the four friction blocks and a first wedge-fitting member arranged on the first driving member and slidingly fitted with the first wedge-shaped member; the first wedge-shaped members on the two friction blocks on each wide side of the virtual rectangle have wedge surfaces parallel to each other.

6. The end cover assembly of a servo motor according to claim 1, characterized in that: A counterweight is provided on the first driving member.

7. The end cover assembly of a servo motor according to claim 1, characterized in that: The second driving member is wedge-fittedly connected to the friction blocks on the two long sides of the virtual rectangle through a second wedge-fitting structure; the second wedge-fitting structure includes a second wedge-shaped member arranged on the four friction blocks and a second wedge-fitting member arranged on the second driving member and slidingly matched with the second wedge-shaped member; the second wedge members on the two friction blocks on each long side of the virtual rectangle have wedge surfaces symmetrically arranged.

8. The end cover assembly of a servo motor according to claim 1, characterized in that: The virtual rectangle is a square; four L-shaped wire grooves are arranged on the outer end surface of the end cover in a mirror-symmetrical manner in the two diagonal directions of the virtual rectangle; the first driving member is detachably and movably inserted in the vertical groove of the L-shaped wire groove; the second driving member is detachably inserted and fixed in the horizontal groove of the L-shaped wire groove.

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