External circulation ball screw combining steel ball reverser and guide pipe

Abstract

The utility model discloses an external circulation ball screw using the combination of steel ball reversers and a guide pipe, which comprises a screw rod, a nut, at least two steel ball reversers, the guide pipe and steel balls, the two steel ball reversers are detachably arranged in an internal spiral raceway, and the steel ball reversers are attached to the internal spiral raceway. The two steel ball reversers are located at the two ends of the nut in the length direction respectively, the two ends of the guide pipe are inserted into the mounting holes respectively and detachably connected with any ends of the two steel ball reversers respectively, and the guide pipe is obliquely arranged. Through the arrangement of the steel ball reverser and the guide pipe, the independent steel ball reverser is easy to optimally design the appearance, the gap at the joint of multiple sections of movement paths of the steel balls is reduced, the sudden change of the direction of the steel balls in the movement paths is reduced, and the clamping stagnation phenomenon of the steel balls due to the overlarge gap at the joint in a circulation loop is avoided; the steel ball reverser can better bear impact load and extrusion in the circulating process of the steel balls, and the working stability is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile manufacturing, especially relates to a kind of outer circulation ball screw using steel ball reverser and catheter combination. BACKGROUND

[0002] With the electrification and intelligentization of automobile industry, each module in the automobile has higher demand for electrification, and in order to meet the response speed and load capacity of the product, ball screw structure is widely used in steering and braking subsystems of the automobile. With the development of electrification, on the one hand, the vehicle increases the weight of the battery, and on the other hand, the electrification of commercial vehicles is more to replace hydraulic products. Both of them require higher load capacity of the subsystem, so it is very important to improve the load capacity of the ball screw.

[0003] At present, the ball screw for vehicle is mainly used in steering and braking fields, and the types of ball screw used include inner circulation ball screw and outer circulation ball screw. However, the processing cost of inner circulation ball screw is generally higher than that of outer circulation ball screw, and the bearing capacity is slightly lower than that of outer circulation type. Although the outer circulation ball screw has advantages in cost and bearing capacity, the number of steel balls in the outer circulation single steel ball loop is large, which is easy to cause jamming and other situations. The steel ball produces a large stamping and extrusion force on the catheter, which causes the guide position of the steel ball catheter of the outer circulation ball screw to deform or even break, causing the ball screw to fail. Due to the insufficient strength of the catheter in the design of the outer circulation ball screw, the catheter often fails before the raceway, and it is difficult to fully utilize the bearing capacity of the ball screw.

[0004] At present, there are two ways to improve the service life of the catheter of the ball screw in the industry. One is to optimize the circulation path of the steel ball to reduce the impact and extrusion force of the steel ball on the catheter, and the other is to use thickened catheter, high-strength material catheter and special treatment catheter to improve the strength and toughness of the catheter. Due to the influence of factors such as additive manufacturing, complex shape mold, material cost and layout space, it is difficult to mass-produce or widely apply.

[0005] Therefore, the utility model is proposed to solve the above technical problems. UTILITY MODEL CONTENT

[0006] The utility model aims at providing an outer circulation ball screw using steel ball reverser and catheter combination to solve the technical problems of insufficient strength of the catheter of the existing outer circulation ball screw and difficult mass production.

[0007] The technical scheme of the utility model is as follows: an outer circulation ball screw using steel ball reverser and catheter combination, comprising:

[0008] Screw rod, any end of screw rod is connected with external driving mechanism;

[0009] The nut is sleeved on the screw rod, the nut is in clearance fit with the screw rod, an inner spiral raceway is formed between the nut and the screw rod, and at least two mounting holes are formed in the nut;

[0010] The at least two steel ball reversers are detachably installed in the inner spiral raceway and are attached to the inner spiral raceway, and the two steel ball reversers are respectively located at two ends in the length direction of the nut.

[0011] The catheter is obliquely arranged, and the catheter and the end of the steel ball reverser form an outer circulation raceway, the catheter comprises two catheter pieces, and the two catheter pieces are buckled to form the catheter.

[0012] The steel ball reverser is an arc-shaped hollow pipe, and the two ends of the steel ball reverser are blocked, and the two ends of the steel ball reverser are both arc-shaped groove structures.

[0013] Further, the steel ball reverser is an arc-shaped hollow pipe, and the two ends of the steel ball reverser are blocked, and the two ends of the steel ball reverser are both arc-shaped groove structures.

[0014] Further, the steel ball reverser is an arc-shaped hollow pipe, and the two ends of the steel ball reverser are blocked, and the two ends of the steel ball reverser are both arc-shaped groove structures.

[0015] The nut is sleeved on the screw rod, the nut is in clearance fit with the screw rod, an inner spiral raceway is formed between the nut and the screw rod, and at least two mounting holes are formed in the nut;

[0016] The nut is sleeved on the screw rod, the nut is in clearance fit with the screw rod, an inner spiral raceway is formed between the nut and the screw rod, and at least two mounting holes are formed in the nut;

[0017] Further, the catheter is fixed on the nut through a pressing plate, and the pressing plate is fixed in the connecting hole through a screw, and the lower end of the screw extends into the limiting hole.

[0018] Further, the catheter can be provided as two, and when the catheter is two, the circulation loop is two.

[0019] Further, the nut is provided with a straight-toothed rack at the bottom, and the straight-toothed rack is used for transmitting power to an external gear.

[0020] By adopting the above technical scheme, the utility model has the following beneficial effects:

[0021] The steel ball reverser and the pipe are arranged, so that the outside of the ball screw forms an outer circulating raceway, the steel ball guide groove between the steel ball reverser, the nut and the screw rod forms an inner spiral raceway, and the outer circulating raceway and the inner spiral raceway cooperate to form a circulating loop of the steel balls; the independent steel ball reverser is easy to be optimized in shape, reduces the gap at the joint of the multi-section movement path of the steel balls, reduces the direction mutation of the steel balls in the movement path, and avoids the phenomenon that the steel balls are stuck due to the too large gap at the joint in the circulating loop; the steel ball reverser can better bear the impact load and extrusion in the circulating process of the steel balls, improves the working stability, meanwhile, the simple-shaped steel ball reverser is also convenient to be processed in the forms of casting, forging, injection molding and the like, the simple structure feature can also reduce the manufacturing cost, improve the production efficiency, is also easy to ensure the processing precision, and meets the design requirement. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are part of the present application, serve to provide a further understanding of the present application, and the schematic embodiments of the present application and the description thereof serve to explain the present application, but do not constitute an improper limitation on the present application. Obviously, the drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings. In the drawings:

[0023] Figure 1 A front view of the outer circulating ball screw using the steel ball reverser and the pipe combination provided by the present application;

[0024] Figure 2 A shaft side view of the outer circulating ball screw using the steel ball reverser and the pipe combination provided by the present application;

[0025] Figure 3 A structure schematic view of Figure 2 A structure schematic view after the pressing plate and the pipe piece on the front side are removed;

[0026] Figure 4 A structure schematic view after the nut is removed; Figure 3

[0027] A structure schematic view of the steel ball loop of the outer circulating ball screw using the steel ball reverser and the pipe combination provided by the present application; Figure 5

[0028] A structure schematic view of the pipe and the steel ball reverser of the outer circulating ball screw using the steel ball reverser and the pipe combination provided by the present application; Figure 6

[0029] A structure schematic view of another view of Figure 7 Figure 4

[0030] ​​Figure 8 A front view of a nut of an outer circulation ball screw combined with a steel ball reverser and a guide pipe according to the embodiment of the present application;

[0031] Figure 9 A structural schematic view of another perspective of Figure 8

[0032] Figure 10 An assembly schematic view of a guide pipe, a steel ball and a steel ball reverser of an outer circulation ball screw combined with a steel ball reverser and a guide pipe according to the embodiment of the present application;

[0033] Figure 11 A structural schematic view of another perspective of Figure 10

[0034] Reference signs: 1, screw rod; 2, screw; 3, pressing plate; 4, guide pipe; 5, nut; 6, steel ball; 7, steel ball reverser.

[0035] It should be noted that the drawings and the written description are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application by referring to specific embodiments for the person skilled in the art. DETAILED DESCRIPTION

[0036] The specific embodiments of the present application are described in further detail in combination with the drawings.

[0037] Referring to Figures 1 to 11 It is shown that the embodiment of the present application provides an outer circulation ball screw combined with a steel ball reverser and a guide pipe, which comprises a screw rod 1, a nut 5, at least two steel ball reversers 7, a guide pipe 4 and a steel ball 6. The screw rod 1 is connected with an external driving mechanism at either end. The nut 5 is sleeved on the screw rod 1 and is in clearance fit with the screw rod 1. An inner spiral raceway is formed between the nut 5 and the screw rod 1. At least two mounting holes are formed in the nut 5. The two steel ball reversers 7 are detachably installed in the inner spiral raceway and are arranged in abutment with the inner spiral raceway. The two steel ball reversers 7 are respectively located at the two ends in the length direction of the nut 5. The guide pipe 4 is inserted into the mounting holes at the two ends and is detachably connected with either end of the two steel ball reversers 7 at the two ends. The guide pipe 4 is arranged obliquely. The guide pipe 4 and the end of the steel ball reverser 7 form an outer circulation raceway. The guide pipe 4 comprises two guide pipe pieces which are buckled to form the guide pipe 4. The outer circulation raceway and the inner spiral raceway form a circulation loop. The steel ball 6 can enter the outer circulation raceway from the inner spiral raceway, and the steel ball 6 can also enter the inner spiral raceway from the outer circulation raceway.

[0038] ​​It should be noted that the steel ball 6 circulates in the circulation loop, is blocked by the steel ball reverser 7 when leaving the inner spiral raceway, is extruded by the rear steel ball 6, enters the guide pipe 4 through the steel ball guide groove on the nut 5, and then enters the inner spiral raceway through the outer circulation raceway and the other side of the steel ball reverser 7.

[0039] The screw rod 1, the nut 5 and the steel ball 6 can be machined after mold opening. The guide pipe 4 can be formed by stamping or injection molding. The steel ball reverser 7 can be formed by using a mold, and can be made of metal or non-metal materials by casting, forging or injection molding. The steel ball reverser 7 can also be made of a blank bar after bending and simple machining.

[0040] The steel ball reverser 7 of the ball screw can reduce the gap at the joint in the movement path of the steel ball 6, prevent the steel ball 6 from being stuck due to the too large gap, and the position of the steel ball 6 entering and leaving the inner spiral raceway is formed by the steel ball reverser 7 and the steel ball guide groove of the nut 5, which has high strength and high precision and can withstand more impact load.

[0041] The steel ball reverser 7 is easy to mass-produce, can greatly improve the load capacity of the ball screw, prolong the service life, improve the smoothness of work, reduce the noise of work, and improve the transmission efficiency. It also has the advantages of high structural strength and low manufacturing cost.

[0042] In the above scheme, the steel ball reverser 7 and the guide pipe 4 are arranged to form an outer circulation raceway outside the ball screw, the steel ball guide groove between the steel ball reverser 7, the nut 5 and the screw rod 1 forms an inner spiral raceway, and the outer circulation raceway and the inner spiral raceway cooperate to form a circulation loop of the steel ball 6. The independent steel ball reverser 7 is easy to optimize the design of the shape, reduce the gap at the joint of the multi-section movement path of the steel ball 6, reduce the direction mutation of the steel ball 6 in the movement path, and avoid the phenomenon that the steel ball 6 is stuck due to the too large gap at the joint in the circulation loop. The steel ball reverser 7 can better withstand the impact load and extrusion of the steel ball 6 in the circulation process, improve the working stability, and the simple-shaped steel ball reverser 7 is also easy to be processed by casting, forging or injection molding. The simple structure can also reduce the manufacturing cost, improve the production efficiency, and more easily ensure the machining precision and meet the design requirements.

[0043] In some possible embodiments, referring to Figures 4 to 7As shown, the steel ball reverser 7 is an arc hollow tube, and both ends are blocked. When blocking both ends of the steel ball reverser 7, the blocking is performed by lubricating grease. Both ends of the steel ball reverser 7 are arc groove structures, which are matched with the end of the guide pipe 4, so that the steel ball 6 can smoothly pass through the arc groove structure into the guide pipe 4, and the steel ball 6 can also smoothly pass through the guide pipe 4 into the arc groove structure. At least two limiting holes are formed on the outer side of the steel ball reverser 7. The nut 5 is provided with a connecting hole matched with the limiting hole from top to bottom. The connecting hole is coaxially arranged with any limiting hole of the steel ball reverser 7.

[0044] In some possible embodiments, referring to Figures 1 to 2 As shown, the guide pipe 4 is fixed on the nut 5 through the pressing plate 3. The pressing plate 3 is fixed in the connecting hole through the screw 2, and the lower end of the screw 2 extends into the limiting hole.

[0045] In the above scheme, the guide pipe 4 is positioned by the pressing plate 3. The screw 2 penetrates the pressing plate 3 and the connecting hole in sequence, and the lower end of the screw 2 extends into the limiting hole, so as to simultaneously fix the guide pipe 4 and the steel ball reverser 7. It should be noted that the middle part of the pressing plate 3 is an outwardly convex arc structure. When the guide pipe 4 is positioned, the outwardly convex arc structure can be wrapped on the outer wall of the guide pipe 4, so as to prevent the two guide pipe pieces from being separated, and avoid affecting the movement of the steel ball 6.

[0046] In some possible embodiments, the guide pipe 4 can be provided as two. When the guide pipe 4 is two, the circulation loop is two-way. At this time, the steel ball reverser 7 is four, and the two circulation loops are sequentially arranged. When the two-way circulation loop is arranged, the length of the nut 5 needs to be lengthened, and the number of turns of a single circulation loop needs to be reduced.

[0047] The nut 5 is provided with a straight toothed rack at the bottom. The straight toothed rack is used to transmit power to the external gear.

[0048] When assembling, first, the steel ball reverser 7 is screwed into the steel ball guide groove of the nut 5. The side of the steel ball reverser 7 blocking the steel ball 6 is aligned with the steel ball guide groove of the nut 5. At this time, the screw rod 1 is screwed in. Then, the steel ball 6 is sequentially loaded into the steel ball guide groove. Then, one guide pipe piece is matched with the nut 5 to load the steel ball 6. Then, another guide pipe piece is loaded. Finally, the guide pipe 4 is compressed by using the pressing plate 3. The pressing plate 3 is fixed by using the screw 2. After the screw 2 is tightened, the lower end is inserted into the limiting hole of the steel ball reverser 7, so as to prevent the steel ball reverser 7 from rotating along the inner spiral track during work.

[0049] The specific embodiment is only an explanation of the utility model, which is not a limitation of the utility model. Those skilled in the art can make modifications without creative contribution after reading the specification, but as long as it is within the protection scope of the utility model, it is protected by the patent law.

Claims

1. An externally-circulating ball screw using a steel ball reverser and a combination of pipes, characterized in that, The utility model relates to a kind of steel ball reversing device, including: Screw rod (1), the screw rod (1) is connected with external driving mechanism at either end; Nut (5), the nut (5) is sleeved on the screw rod (1), the nut (5) is gap matched with the screw rod (1), and inner spiral raceway is formed between the nut (5) and the screw rod (1), at least two mounting holes are formed in the nut (5); At least two steel ball reversers (7), two the steel ball reversers (7) are detachably installed in the inner spiral raceway, and the steel ball reverser (7) is attached to the inner spiral raceway, and two the steel ball reversers (7) are located at the length direction both ends of the nut (5) respectively; Catheter (4), the catheter (4) is inserted into the mounting hole at both ends respectively, and the catheter (4) is detachably connected with either end of two the steel ball reversers (7) at both ends respectively, the catheter (4) is inclinedly arranged, and the catheter (4) and the end of the steel ball reverser (7) form outer circulation raceway, the catheter (4) includes two catheter pieces, and two the catheter pieces are buckled to form the catheter (4), and the outer circulation raceway and the inner spiral raceway form circulation loop; Steel ball (6), the steel ball (6) can be entered into the outer circulation raceway from the inner spiral raceway, and the steel ball (6) can also be entered into the inner spiral raceway from the outer circulation raceway.

2. The external circulation ball screw using a steel ball reverser and a pipe combination according to claim 1, characterized in that, The steel ball reverser (7) is arc hollow tube, and both ends are blocked, both ends of the steel ball reverser (7) are arc groove structure, the arc groove structure is matched with the end of the catheter (4), so that the steel ball (6) can smoothly pass through arc groove structure and enter catheter (4), and the steel ball (6) can also smoothly pass through catheter (4) and enter arc groove structure.

3. The external circulation ball screw using a steel ball reverser and a pipe combination according to claim 2, characterized in that, At least two limiting holes are formed in the outer side of the steel ball reverser (7); The nut (5) is provided with connecting hole matched with the limiting hole from top to bottom; The connecting hole and any limiting hole of the steel ball reverser (7) are coaxially arranged.

4. The external circulation ball screw using a steel ball reverser and a pipe combination according to claim 3, characterized in that, The catheter (4) is fixed on the nut (5) by pressing plate (3), the pressing plate (3) is fixed in the connecting hole by screw (2), and the lower end of the screw (2) extends into the limiting hole.

5. The external circulation ball screw using a steel ball reverser and a pipe combination according to claim 4, wherein The catheter (4) can be provided as two, when the catheter (4) is two, the circulation loop is two-way.

6. The external circulation ball screw using a steel ball reverser and a pipe combination according to claim 4, wherein The nut (5) is provided with straight-toothed rack at the bottom, and the straight-toothed rack is used to transmit power to external gear.

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