A sleeve top rod type ball screw pair

Abstract

The utility model relates to a ball screw pair technical field especially sleeve top rod formula ball screw pair, including screw rod axle and T shape oil tank, the screw rod axle is equipped with the nut axle sleeve, the nut axle sleeve has the backflow channel, the nut axle sleeve is fixed with the fixed base, the top of fixed base has the fixed groove with backflow channel intercommunication, the both ends of fixed base and T shape oil tank top are equipped with the assembly hole respectively. Through fixed base, T shape oil tank, locating piece and fastener, can play the lubrication effect to the nut axle sleeve inside ball when using, through the cooperation of fastener and locating piece, the locating piece carries out the transverse location to fastener bottom, effectively suppressed the fastener loosening risk under the screw rod vibration environment, reduces the oil tank displacement probability, ensures the oil drip pipe and backflow channel always accurate butt joint, avoids the oil drip failure problem from the root, guarantees the continuity of ball lubrication, improves the transmission stability and service life of ball screw pair.

Description

Technical Field

[0001] This utility model relates to the field of ball screw pair technology, specifically a sleeve-type ball screw pair. Background Technology

[0002] As a precision transmission component, ball screw pairs are widely used in CNC machine tools, industrial robots and other automated equipment. Their lubrication effect directly affects transmission accuracy, service life and equipment stability. To ensure the reliable operation of ball screw assemblies, existing technologies typically incorporate a lubrication system on the nut bushing. This system stores lubricating oil in an oil tank and delivers it to the ball return channel via a drip pipe, achieving continuous lubrication of the balls. A Chinese utility model patent (publication number: CN219639403U) discloses a sleeve-type ball screw assembly, comprising a screw shaft, a nut bushing, and balls. The nut bushing is fitted onto the screw shaft and has a return channel within it. A wear-resistant pad is affixed to the inner wall of the nut bushing. An oil tank is located on the surface of the nut bushing at the location of the return channel. The oil tank has a manual vent valve plug, and a drip pipe is located at the bottom of the oil tank, connected to the return channel. A connecting bushing is fitted onto one end of the screw shaft, and a rotating shaft is located at one end of the connecting bushing. The connecting bushing is secured with a retaining ring when fitted onto the end of the screw shaft. This invention allows for selection of the manual vent valve opening size based on the operating speed, thereby adjusting the oil dripping speed of the oil dripping pipe to achieve a better ball bearing oil replenishment effect; the connecting bushing is designed with an outer sleeve and an inner insert to connect with the lead screw shaft, which can simultaneously drive the outer wall and center of the lead screw shaft, preventing derailment and slippage, and providing a good driving effect.

[0003] In this technical solution, the oil tank is directly fixed to the surface of the nut bushing by screws. However, in actual applications, due to the inevitable vibration generated during the operation of the ball screw pair, long-term action can easily lead to loosening of the screws and displacement of the oil tank, which in turn causes deviation in the connection between the oil drip pipe and the return channel, ultimately resulting in oil drip failure. This seriously affects the lubrication effect of the balls and aggravates the wear of the balls and raceways. Therefore, a sleeve-top rod type ball screw pair is needed to improve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a sleeve-type ball screw assembly to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A sleeve-type ball screw assembly includes a screw shaft and a T-shaped oil tank. A nut bushing is fitted onto the screw shaft, and the nut bushing has a return channel.

[0006] A fixing seat is fixed on the nut bushing. The top of the fixing seat has a fixing groove that communicates with the return channel. Assembly holes are opened at both ends of the fixing seat and the top of the T-shaped oil tank. When the T-shaped oil tank is assembled on the fixing groove, a fastener is fitted in the assembly hole on the top of the T-shaped oil tank. One end of the fastener extends into the assembly hole on the fixing seat.

[0007] Positioning elements are provided at both ends of the outer wall of the fixed base, and one end of the positioning element extends into the interior of the fastener.

[0008] As a preferred embodiment of this utility model, the T-shaped oil tank is provided with a manual vent valve plug, and the bottom of the T-shaped oil tank is provided with an oil drip pipe connected to the return channel.

[0009] As a preferred embodiment of this utility model, the assembly hole includes a screw hole, and rectangular grooves are symmetrically formed on both sides of the inner wall of the screw hole about the center of the screw hole.

[0010] As a preferred embodiment of this utility model, the fastener includes a fastening bolt, the bottom of which is rotatably connected to a limiting plate, a positioning hole is provided through the side wall of the limiting plate, the fastening bolt is threadedly engaged with the bolt hole, and the limiting plate is slidably engaged with the rectangular groove.

[0011] As a preferred embodiment of this utility model, both sides of the fixing base are provided with stepped grooves with connecting assembly holes, and positioning elements are provided on the stepped grooves.

[0012] As a preferred embodiment of this utility model, the positioning component includes a stepped rod that is clearance-fitted into a stepped groove. Two limiting grooves are formed on the outer wall of the thin end of the stepped rod. A first spring is sleeved on the outer wall of the stepped rod. The two ends of the first spring abut against the thick end of the stepped rod and one side of the inner wall of the stepped groove, respectively. A handle is fixed to the thin end of the stepped rod after it passes through the narrow opening of the stepped groove. The thick end of the stepped rod extends into the positioning hole.

[0013] As a preferred embodiment of this utility model, the positioning component further includes a rectangular frame, which is fixed to the outer wall of the fixing base. Guide rods are vertically fixed at both ends of the inner side of the rectangular frame. A T-shaped insert plate slides on both guide rods. The T-shaped insert plate extends downward through the rectangular frame and into one of the limiting grooves. A second spring is sleeved on the outer wall of the guide rod. The two ends of the second spring abut against the top surface of the inner wall of the rectangular frame and the top plate of the T-shaped insert plate, respectively. A T-shaped pull rod is fixed at the middle of the top of the T-shaped insert plate. A ring is fixed to the T-shaped pull rod outside the rectangular frame.

[0014] As a preferred embodiment of this utility model, a rectangular opening is provided through the bottom of the rectangular frame, the vertical end of the T-shaped insert plate is fitted with the rectangular opening with a clearance, and a circular hole is provided through the top of the rectangular frame, the circular hole being fitted with the T-shaped pull rod with a clearance.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. In this utility model, through the structural design of the fixed seat, T-shaped oil tank, positioning component and fastener, it can lubricate the balls inside the nut bushing during use. Through the cooperation of the fastener and the positioning component, the positioning component laterally limits the bottom of the fastener, effectively suppressing the risk of loosening of the fastener under the vibration environment of the ball screw, reducing the probability of oil tank displacement, ensuring that the oil drip pipe and return channel are always accurately connected, avoiding the problem of oil drip failure from the root, ensuring the continuity of ball lubrication, and significantly improving the transmission stability and service life of the ball screw pair.

[0016] 2. In this utility model, through the design of structures such as limiting plates, positioning holes, limiting grooves, rectangular frames and T-shaped inserts, the step rod can be limited during the assembly of the oil tank, ensuring that the fasteners can be installed efficiently and accurately, avoiding assembly interference between the fasteners and the step rods, reducing assembly difficulty and time costs, and improving production efficiency.

[0017] 3. In this utility model, the sliding fit design of the rectangular groove and the limiting plate ensures that the fastening bolt and the screw hole thread fit together to achieve the positioning of the T-shaped oil tank. At the same time, it can ensure the effective fit between the positioning hole and the first spring to achieve the lateral limiting of the fastening bolt and play a guiding role. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the nut and bushing structure of this utility model; Figure 3 This is a schematic diagram of the T-shaped fuel tank assembly structure of this utility model; Figure 4 This is a schematic diagram of the positioning component assembly structure of this utility model; Figure 5 For the present utility model Figure 4 A magnified view of the structure at point A in the middle; Figure 6 This is a schematic diagram of the stepped bar structure of this utility model; Figure 7 This is a schematic diagram of the fastener structure of this utility model.

[0019] In the diagram: 1. Lead screw shaft; 2. Nut bushing; 20. Return channel; 3. Fixed seat; 30. Fixed groove; 31. Stepped groove; 4. T-shaped oil tank; 5. Assembly hole; 50. Screw hole; 51. Rectangular groove; 6. Positioning component; 60. Stepped rod; 600. Limiting groove; 61. First spring; 62. Handle; 63. Rectangular frame; 64. Guide rod; 65. T-shaped insert plate; 66. Second spring; 67. T-shaped tie rod; 7. Fastener; 70. Fastening bolt; 71. Limiting plate; 72. Positioning hole. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, and several embodiments of the utility model will be provided. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and complete.

[0022] For examples, please refer to Figure 1-7 This utility model provides a technical solution: A sleeve-type ball screw assembly includes a screw shaft 1 and a T-shaped oil tank 4. A nut bushing 2 is sleeved on the screw shaft 1, and the nut bushing 2 has a return channel 20.

[0023] A fixing seat 3 is fixed on the nut bushing 2. The top of the fixing seat 3 has a fixing groove 30 that communicates with the return channel 20. The fixing seat 3 and the top of the T-shaped oil tank 4 are respectively provided with assembly holes 5. When the T-shaped oil tank 4 is assembled on the fixing groove 30, a fastener 7 is fitted in the assembly hole 5 on the top of the T-shaped oil tank 4. One end of the fastener 7 extends into the assembly hole 5 on the fixing seat 3.

[0024] Positioning elements 6 are provided at both ends of the outer wall of the fixed base 3, and one end of the positioning element 6 extends into the interior of the fastener 7.

[0025] In this embodiment, the T-shaped oil tank 4 is equipped with a manual vent valve plug, and the bottom of the T-shaped oil tank 4 is equipped with an oil drip pipe that is connected to the return channel 20.

[0026] Among them, the bottom of the T-shaped oil tank 4 has an annular groove on the mating surface with the nut bushing 2, and an O-ring (specification Φ30×2.65) is built in to prevent oil leakage. The valve stem of the manual venting valve plug is sealed with PTFE packing at the interface with the oil tank, so that no oil overflows when adjusting the venting volume.

[0027] In this embodiment, the assembly hole 5 includes a screw hole 50, and rectangular grooves 51 are symmetrically formed on both sides of the inner wall of the screw hole 50 about the center of the screw hole 50.

[0028] In this embodiment, the fastener 7 includes a fastening bolt 70, the bottom of which is rotatably connected to a limiting plate 71. A positioning hole 72 is provided through the side wall of the limiting plate 71. The fastening bolt 70 is threadedly engaged with the screw hole 50, and the limiting plate 71 is slidably engaged with the rectangular groove 51.

[0029] The top of the limiting plate 71 is fixed with a rotating shaft, and the fastening bolt 70 is made of 304 stainless steel with an internal hexagonal head (for easy tool operation). The fastening bolt 70 and the limiting plate 71 are rotatably connected by a deep groove ball bearing and a rotating shaft.

[0030] In this embodiment, stepped grooves 31 with connecting assembly holes 5 are provided on both sides of the fixed base 3, and positioning elements 6 are provided on the stepped grooves 31.

[0031] In this embodiment, the positioning member 6 includes a stepped rod 60 that is clearance-fitted into the stepped groove 31. Two limiting grooves 600 are formed on the outer wall of the thin end of the stepped rod 60. A first spring 61 is sleeved on the outer wall of the stepped rod 60. The two ends of the first spring 61 abut against the thick end of the stepped rod 60 and one side of the inner wall of the stepped groove 31, respectively. A handle 62 is fixed after the thin end of the stepped rod 60 passes through the narrow opening of the stepped groove 31. The thick end of the stepped rod 60 extends into the positioning hole 72.

[0032] Among them, the limiting groove 600 is a U-shaped groove, and the two limiting grooves 600 correspond to the "retract" and "extend" workstations respectively.

[0033] In this embodiment, the positioning component 6 further includes a rectangular frame 63, which is fixed to the outer wall of the fixing base 3. Guide rods 64 are vertically fixed at both ends of the inner side of the rectangular frame 63. A T-shaped insert plate 65 slides on both guide rods 64. The T-shaped insert plate 65 extends downward through the rectangular frame 63 and into one of the limiting grooves 600. A second spring 66 is sleeved on the outer wall of the guide rods 64. The two ends of the second spring 66 abut against the top surface of the inner wall of the rectangular frame 63 and the top plate of the T-shaped insert plate 65, respectively. A T-shaped pull rod 67 is fixed at the middle of the top of the T-shaped insert plate 65. A ring is fixed to the T-shaped pull rod 67 outside the rectangular frame 63.

[0034] In this embodiment, a rectangular opening is provided through the bottom of the rectangular frame 63, and the vertical end of the T-shaped insert 65 is fitted with the rectangular opening with a clearance. A circular hole is provided through the top of the rectangular frame 63, and the circular hole is fitted with the T-shaped pull rod 67 with a clearance.

[0035] The working process of this utility model: When the sleeve-type ball screw pair designed using this solution is running: Unlock the positioning component 6, pull the T-shaped lever 67 upward, causing the T-shaped insert 65 to slide upward along the guide rod 64. The second spring 66 is compressed, and the vertical end of the T-shaped insert 65 disengages from the limiting groove 600 of the step rod 60. Grasp the handle 62 and pull the step rod 60 outward. The first spring 61 is compressed, and the thick end of the step rod 60 retracts into the step groove 31. At this time, the vertical end of the T-shaped insert 65 inserts into the other limiting groove 600 of the step rod 60, completing the unlocking and avoidance of the positioning component 6.

[0036] Fit the bottom of the T-shaped oil tank 4 into the fixing groove 30 of the fixing seat 3, ensuring that the oil drip pipe is aligned with the return channel 20, and that the mounting hole 5 on the top of the T-shaped oil tank 4 is coaxially aligned with the mounting hole 5 on the fixing seat 3.

[0037] The fastening bolt 70 is passed through the assembly hole 5 of the T-shaped oil tank 4 and threaded into the screw hole 50 of the fixed seat 3. The limiting plate 71 moves axially with the bolt and slides smoothly down the rectangular groove 51 (because the bolt and the limiting plate are connected by a bearing, the limiting plate does not rotate with the bolt).

[0038] When the limiting plate 71 slides down to the bottom of the rectangular groove 51 (the bolts are tightened in place and the oil tank 4 is fixed), repeat the above steps so that the vertical end of the T-shaped insert 65 extends out of the limiting groove 600 near the thick end of the step rod 60 and is inserted into the limiting groove 600 away from the thick end of the step rod 60 to complete the limiting of the step rod 60. At this time, the thick end of the step rod 60 extends into the positioning hole 72.

[0039] The threaded engagement between the fastening bolt 70 and the screw hole 50 provides axial clamping force, firmly fixing the T-shaped oil tank 4 onto the fixing groove 30 of the fixing seat 3, thus preventing axial displacement of the oil tank.

[0040] The engagement between the thick end of the stepped rod 60 and the positioning hole 72 restricts the axial movement of the limiting plate 71, thereby locking the axial position of the fastening bolt and forming a lateral limiting chain of "bolt-limiting plate-stepped rod".

[0041] The vibration generated by the screw operation will attempt to loosen the fastening bolt, but the preload of the first spring 61 keeps the stepped rod 60 abutting against the positioning hole 72. The T-shaped insert 65 locks the position of the stepped rod 60, preventing it from retracting due to vibration, ensuring that the lateral limit is effective and completely solving the problem of traditional screw vibration loosening.

[0042] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sleeve-type ball screw assembly, comprising a screw shaft (1) and a T-shaped oil tank (4), wherein a nut bushing (2) is sleeved on the screw shaft (1), and the nut bushing (2) has a return channel (20), characterized in that: A fixing seat (3) is fixed on the nut bushing (2). The top of the fixing seat (3) has a fixing groove (30) that communicates with the return channel (20). Assembly holes (5) are opened at both ends of the top of the fixing seat (3) and the T-shaped oil tank (4). When the T-shaped oil tank (4) is assembled on the fixing groove (30), a fastener (7) is fitted in the assembly hole (5) at the top of the T-shaped oil tank (4). One end of the fastener (7) extends into the assembly hole (5) on the fixing seat (3). Positioning elements (6) are provided at both ends of the outer wall of the fixed base (3), and one end of the positioning element (6) extends into the interior of the fastener (7).

2. The sleeve-type ball screw assembly according to claim 1, characterized in that: The T-shaped oil tank (4) is equipped with a manual vent valve plug, and the bottom of the T-shaped oil tank (4) is equipped with an oil drip pipe and the oil drip pipe is connected to the return channel (20).

3. The sleeve-type ball screw assembly according to claim 1, characterized in that: The assembly hole (5) includes a screw hole (50), and rectangular grooves (51) are symmetrically opened on both sides of the inner wall of the screw hole (50) about the center of the screw hole (50).

4. A sleeve-type ball screw assembly according to claim 1 or 3, characterized in that: The fastener (7) includes a fastening bolt (70), the bottom of which is rotatably connected to a limiting plate (71), and a positioning hole (72) is provided through the side wall of the limiting plate (71). The fastening bolt (70) is threadedly engaged with the screw hole (50), and the limiting plate (71) is slidably engaged with the rectangular groove (51).

5. A sleeve-type ball screw assembly according to claim 1, characterized in that: The fixed base (3) has stepped grooves (31) with connecting assembly holes (5) on both sides, and positioning parts (6) are provided on the stepped grooves (31).

6. A sleeve-type ball screw assembly according to claim 5, characterized in that: The positioning component (6) includes a stepped rod (60) with clearance fit in the stepped groove (31). The outer wall of the thin end of the stepped rod (60) has two limiting grooves (600). The outer wall of the stepped rod (60) is fitted with a first spring (61). The two ends of the first spring (61) abut against the thick end of the stepped rod (60) and one side of the inner wall of the stepped groove (31), respectively. The thin end of the stepped rod (60) passes through the narrow opening of the stepped groove (31) and is fixed with a handle (62). The thick end of the stepped rod (60) extends into the positioning hole (72).

7. A sleeve-type ball screw assembly according to claim 6, characterized in that: The positioning component (6) also includes a rectangular frame (63), which is fixed to the outer wall of the fixing base (3). Guide rods (64) are vertically fixed at both ends of the rectangular frame (63). A T-shaped insert (65) slides on both guide rods (64). The T-shaped insert (65) extends downward through the rectangular frame (63) and into one of the limiting grooves (600). A second spring (66) is sleeved on the outer wall of the guide rod (64). The two ends of the second spring (66) abut against the top surface of the inner wall of the rectangular frame (63) and the top plate of the T-shaped insert (65). A T-shaped pull rod (67) is fixed at the middle of the top of the T-shaped insert (65). A ring is fixed on the T-shaped pull rod (67) outside the rectangular frame (63).

8. A sleeve-type ball screw assembly according to claim 7, characterized in that: The bottom of the rectangular frame (63) has a rectangular opening, the vertical end of the T-shaped insert (65) is fitted with the rectangular opening with a clearance, and the top of the rectangular frame (63) has a circular hole, which is fitted with the T-shaped pull rod (67) with a clearance.

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