Ball screw pair of a double-layer opposed channel structure ball circulator

Abstract

The present invention relates to the technical field of ball screws, and in particular to a ball screw pair of a double-layer mating channel structure ball circulator; it includes a ball screw pair of a double-layer mating channel structure ball circulator, which comprises a first annular component and a second annular component. The first annular component and the second annular component are oppositely combined to form a ball circulation raceway; the first annular component is mated with a connecting raceway on the nut to form a ball inlet and outlet thread raceway, and a ball raceway is provided on the nut and the ball screw, and the ball raceway is mated with the ball inlet and outlet thread raceway; the ball raceway, the connecting raceway, the ball inlet and outlet thread raceway and the ball circulation raceway are circularly connected, achieving the effects of high positioning accuracy of the ball screw ball circulator, reduced production and manufacturing difficulty, high production and manufacturing efficiency of the nut, high yield, high assembly efficiency of the ball screw pair, and greatly improved load-bearing capacity of the ball screw pair.

Description

Technical Field

[0001] The present invention relates to the technical field of ball screws, and in particular to a ball screw pair of a double-layer in-opposite-channel structure ball circulator. Background Art

[0002] The ball circulator of a ball screw provides a channel for the balls to circulate within the nut. The threads in the screw and the nut are unidirectional and unclosed. Without a ball circulator, the balls cannot achieve reciprocating circular rolling. The reciprocating circular rolling of the balls causes relative displacement and displacement commutation between the nut and the screw. Therefore, the ball circulator of a ball screw is an indispensable component of a ball screw pair.

[0003] Most of the ball circulators of the prior art ball screw pairs adopt two structures: external circulation conduit type and internal circulation type.

[0004] External circulation conduit type: The steel pipe is folded into a U shape, and special shapes are made at the entrances and exits at both ends of the steel pipe. It is installed and fixed on the nut, and the entrances and exits at both ends are connected to the thread raceway, so that the balls on the thread raceway flow back in the U-shaped bent pipe to form a closed loop of the balls on the thread raceway, realizing the orderly circulation of the balls on the thread raceway.

[0005] Internal circulation type: A mechanism is inlaid on the internal raceway of the nut, and a special-shaped channel is made on this mechanism, spanning and connecting adjacent two raceways, so that the balls form a single closed return raceway. To form a closed loop of the balls on the thread raceway, realizing the orderly circulation of the balls on the thread raceway.

[0006] Taking a micro ball screw with a screw diameter of 6 mm and a pitch of 2 mm as an example, the outer diameter of its nut is 12 mm, the rotary diameter of the screw helix is 8.2 mm, and the ball diameter is 1.2 mm. In such a narrow space, it is very difficult for the ball circulators produced by the external circulation conduit type and the internal circulation type structures to achieve the functions that a ball circulator of a ball screw should have. Its disadvantages are as follows:

[0007] 1. Due to its small size and high positioning accuracy requirements, the production cost of the circulator is high. The qualified rate of the finished product is low.

[0008] 2. The installation position of the circulator is small and the positioning accuracy requirements are high, which increases the processing difficulty of the nut and the qualified rate of the finished product is low.

[0009] 3. For nuts of the same length, since the raceway is occupied by the ball circulator, the number of effective rolling balls is reduced, reducing the load-bearing capacity of the screw pair.

[0010] 4. The assembly of the ball screw pair is difficult, with low efficiency and low qualified rate of the finished product. The production cost is increased. Summary of the Invention

[0011] The object of the present invention is to provide a ball screw pair of a double-layer mating channel structure ball circulator aiming at the defects existing in the prior art.

[0012] To achieve the above object, the technical solution adopted by the present invention is as follows: It includes a screw rod, a nut, balls, and two ball circulators respectively arranged at both ends of the nut. The ball circulator is formed by the mating of a first annular component and a second annular component; on the annular mating surface of the mating side of the first annular component, there is a first ball raceway; on the annular mating surface of the mating side of the second annular component, there is a second ball raceway, and after the first annular component and the second annular component are mated, the ball circulator forms a circulating raceway jointly by the first ball raceway and the second ball raceway; the screw rod and the nut cooperate to jointly form a spiral raceway for the balls to roll; the ball circulator has a ball inlet and outlet thread raceway that mates with the spiral raceway of the nut end face; the ball inlet and outlet on the first annular component are connected to the connecting raceway on the nut; the balls roll back and forth between the spiral raceway formed by the screw rod and the nut, the circulating raceway of the ball circulator, the ball inlet and outlet thread raceway, and the connecting raceway of the nut.

[0013] Further, a plurality of uniformly symmetrical ball circulating raceways can be generated on the mating surfaces of the first annular component and the second annular component, and a plurality of uniformly symmetrical ball inlet and outlet thread raceways can be generated on the first annular component.

[0014] Further, a cutter-type raised block that can be embedded in the spiral raceway on the screw rod is arranged on the inner annular surface of the first annular component.

[0015] Further, a first ball guiding port and an outer side surface are arranged on the inner side of the cutter-type raised block. The first ball guiding port and the outer side surface are connected to the spiral raceway to form a ball inlet and outlet structure, and cooperate with the connecting raceway to form a closed ball circulating system.

[0016] Further, a blocking component is also arranged for axial limit, and the nut, the ball circulator, and the blocking component are detachably installed as a whole.

[0017] Further, axial limit can also be carried out by a round nut through threads, and fixed at the axial end face position by screws and glue

[0018] Further, a positioning pin hole can be made on the joint surface of the first annular component and the second annular component.

[0019] Further, the first annular component can be provided with a radial protrusion, and the second annular component can be provided with a second radial protrusion.

[0020] Furthermore, a plurality of the radial protrusions and the second radial protrusions may be provided.

[0021] By the technical solution of the present invention, the following technical effects can be achieved:

[0022] By introducing the ball bearings into the circulators at both ends of the nut along a specific circulating motion path. The circulator is composed of two mating circular rings, and ball tracks are made on the mating surface, so that the ball bearings have sufficient space for commutation within the tracks. Ball screw raceways are made on the end surface of the circulator. The inlets and outlets are placed on tracks with different radii, so that the inlets and outlets of the ball bearings of the ball circulator coincide exactly with the inlets and outlets of the ball bearings of the nut. Positioning rings are made at the positions of the inlets and outlets that fit the nut, so that the inlets and outlets are accurately positioned.

[0023] The following are achieved:

[0024] 1. Place the ball circulator at both end faces of the nut, increasing the installation position of the ball circulator.

[0025] 2. Composed of two mating circular rings, with ball tracks made on the mating surface, making the ball tracks easy to manufacture, with high manufacturing precision and low manufacturing cost.

[0026] 3. The manufacturing precision of the inlets and outlets of the ball bearings of the ball circulator is high and the positioning is good, enabling a smooth transition at the rolling connections between the ball bearings and the nut and the lead screw, which is extremely beneficial for increasing the movement speed and reducing noise.

[0027] 4. Since the ball circulator is at both end faces of the nut, the contact length between the ball bearings, the lead screw and the nut is increased, significantly improving the load-bearing capacity of the ball screw pair.

[0028] 5. Since the ball circulator is positioned at both end faces of the nut, 1 to 8 uniformly symmetric ball tracks can be made on the mating surface of the ball circulator for the design and manufacture of large lead multi-channel high-precision ball screws.

[0029] 6. The in-line ball screw ball circulator has high positioning accuracy, reduces the difficulty of production and manufacturing, has high production and manufacturing efficiency of the nut, high yield, and high assembly efficiency of the ball screw pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments described in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1Schematic diagram of the ball screw pair of the double-layer mating channel structure ball circulator in the embodiment of the present invention;

[0032] Figure 2 Schematic diagram of the structure of the ball circulator and the structure after removing the balls in the embodiment of the present invention;

[0033] Figure 3 Schematic diagram of the ball distribution structure in the spiral raceway and the ball channel in the embodiment of the present invention;

[0034] Figure 4 Front view structural schematic diagram of the first annular component in the embodiment of the present invention;

[0035] Figure 5 Rear view structural schematic diagram of the first annular component in the embodiment of the present invention;

[0036] Figure 6 Three-dimensional perspective structural schematic diagram of the first annular component at the first position in the embodiment of the present invention;

[0037] Figure 7 Three-dimensional perspective structural schematic diagram of the first annular component at the second position in the embodiment of the present invention;

[0038] Figure 8 Front view structural schematic diagram of the second annular component in the embodiment of the present invention;

[0039] Figure 9 Three-dimensional perspective structural schematic diagram of the second annular component at the first position in the embodiment of the present invention;

[0040] Figure 10 Three-dimensional perspective structural schematic diagram of the combination of the first annular component and the second annular component at the first position in the embodiment of the present invention;

[0041] Figure 11 Front view structural schematic diagram of the nut of the ball screw pair of the double-layer mating channel structure ball circulator of the present invention;

[0042] Figure 12 A-A sectional structural schematic diagram of the nut of the ball screw pair of the double-layer mating channel structure ball circulator of the present invention;

[0043] Figure 13 Three-dimensional perspective structural schematic diagram of the nut of the ball screw pair of the double-layer mating channel structure ball circulator of the present invention at the first position

[0044] Figure 14 Front perspective structural schematic diagram of the first annular component of the ball screw pair of the double-headed thread double-layer mating channel structure ball circulator of the present invention;

[0045] Figure 15 IsFigure 14 Three-dimensional perspective structural schematic diagram of the first position of the first annular component shown;

[0046] Figure 16 It is a front view structural schematic diagram of the second annular component of the ball screw pair of the double-headed thread double-layer mating channel structure ball circulator of the present invention;

[0047] Figure 17 Is Figure 16 Three-dimensional perspective structural schematic diagram of the first position of the second annular component shown;

[0048] Figure 18 It is a front view structural schematic diagram of the first annular component of the ball screw pair of the quadruple-thread double-layer mating channel structure ball circulator of the present invention;

[0049] Figure 19 Is Figure 18 Three-dimensional perspective structural schematic diagram of the first position of the first annular component shown;

[0050] Figure 20 Is Figure 18 Three-dimensional perspective structural schematic diagram of the second position of the first annular component shown;

[0051] Figure 21 It is a front view structural schematic diagram of the second annular component of the ball screw pair of the quadruple-thread double-layer mating channel structure ball circulator of the present invention;

[0052] Figure 22 Is Figure 21 Three-dimensional perspective structural schematic diagram of the first position of the second annular component shown;

[0053] Reference numerals:

[0054] Ball screw 1, spiral raceway 11, nut 2, connecting raceway 25, card slot 26, thread 27, ball 3, ball circulating raceway 31, first annular component 4, ball inlet and outlet thread raceway 40, radial protrusion 41, first ball raceway 42, outer side surface 43, shovel-shaped protrusion block 44, first ball inlet and outlet 45, first ball guiding port 46, second annular component 5, second radial protrusion 51, second ball raceway 52, second ball inlet and outlet 55, second ball guiding port 56, blocking component 6. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0056] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0057] A ball screw pair of a double-layer opposed channel structure ball circulator, as Figure 1 and 2 shown, includes a lead screw 1, a nut 2, balls 3, and two ball circulators respectively disposed at both ends of the nut 2. The ball circulator is formed by the opposed combination of a first annular member 4 and a second annular member 5. The annular mating surface on the opposed side of the first annular member 4 has a first ball raceway 42. The annular mating surface on the opposed side of the second annular member 5 has a second ball raceway 52, and the ball circulator forms a circulating raceway 31 jointly by the first ball raceway 42 and the second ball raceway 52 after the first annular member 4 and the second annular member 5 are opposed. The lead screw 1 and the nut 2 cooperate to jointly form a helical raceway 11 for the balls 3 to roll. The ball circulator has a ball inlet and outlet thread raceway 40 that mates with the helical raceway 11 on the end face of the nut 2. The ball inlet and outlet 45 on the first annular member 4 is connected to the connecting raceway 25 on the nut 2. The balls 3 roll back and forth between the helical raceway 11 formed by the lead screw 1 and the nut 2, the circulating raceway 31 of the ball circulator, the ball inlet and outlet thread raceway 40, and the connecting raceway 25 of the nut 2.

[0058] Specifically, by including a lead screw 1, a nut 2, balls 3, and two ball circulators respectively disposed at both ends of the nut 2, the ball circulator is formed by the opposed combination of a first annular member 4 and a second annular member 5, the annular mating surface on the opposed side of the first annular member 4 has a first ball raceway 42, the annular mating surface on the opposed side of the second annular member 5 has a second ball raceway 52, and the ball circulator forms a circulating raceway 31 jointly by the first ball raceway 42 and the second ball raceway 52 after the first annular member 4 and the second annular member 5 are opposed, so as to form a circulator for fixing the rolling circulation route of the balls 3 when the first annular member 4 and the second annular member 5 are opposed. The circulating space in the ball circulator is formed by the mating of two spaces, namely the first ball raceway 42 and the second ball raceway 52.

[0059] The screw rod 1 and the nut 2 cooperate to jointly form a spiral raceway 11 for the rolling of the ball 3; the ball circulator has a ball inlet and outlet thread raceway 40 that is aligned with the spiral raceway 11 on the end face of the nut 2; the ball inlet and outlet 45 on the first annular member 4 is connected to the connecting raceway 25 on the nut 2; the ball 3 rolls back and forth between the spiral raceway 11 formed by the screw rod 1 and the nut 2, the circulating raceway 31 of the ball circulator, the ball inlet and outlet thread raceway 40, and the connecting raceway 25 of the nut 2, thereby forming a space and route for the circulating rolling of the ball 3 jointly composed of the spiral raceway 11, the circulating raceway 31 of the ball circulator, the ball inlet and outlet thread raceway 40, and the connecting raceway 25.

[0060] As a preference of the above embodiment, as Figure 2 shown, a plurality of uniformly symmetric ball circulating raceways 31 can be generated on the mating surfaces of the first annular member 4 and the second annular member 5, and a plurality of uniformly symmetric ball inlet and outlet thread raceways 40 can be generated on the first annular member 4.

[0061] Specifically, through the structure that a plurality of uniformly symmetric ball circulating raceways 31 can be generated on the mating surfaces of the first annular member 4 and the second annular member 5, and a plurality of uniformly symmetric ball inlet and outlet thread raceways 40 can be generated on the first annular member 4, it is used to adapt a plurality of ball circulating raceways 31 to the corresponding multi-start screw rod, complete the circulating connection between the spiral raceway 11, the connecting raceway 25, the ball inlet and outlet thread raceway 40, and the ball circulating raceway 31 in the multi-start screw rod, and adapt to the design and manufacture of large lead multi-channel high-precision ball screw rods.

[0062] As a preference of the above embodiment, as Figure 4 shown, a cutter-type raised block 44 that can be embedded in the screw rod spiral raceway 11 is provided on the inner annular surface of the first annular member 4.

[0063] As a preference of the above embodiment, as Figure 4 shown, a first ball guiding port 46 and an outer side surface 43 are provided inside the cutter-type raised block 44. The first ball guiding port 46 and the outer side surface 43 are connected to the spiral raceway 11 to form a ball inlet and outlet structure, and cooperate with the connecting raceway 25 to form a set of closed ball circulating system.

[0064] Specifically, through the structure that a first ball guiding port 46 and an outer side surface 43 are provided inside the cutter-type raised block 44 and are connected to the spiral raceway 11, the first ball guiding port 46 and the outer side surface 43 are connected to the spiral raceway 11 to form a ball inlet and outlet structure, and cooperate with the connecting raceway 25 to form a set of closed ball circulating system, so that the balls 3 in the spiral raceway 11 and the connecting raceway 25 can smoothly enter and exit, and return to the connecting raceway 25 after passing through the ball circulating raceway 31 to form a set of closed ball circulating system.

[0065] As a preference of the above embodiment, as Figure 1 shown, a blocking member 6 is further provided for axial limit, and the nut 2, the ball circulator and the blocking member 6 are detachably installed as a whole.

[0066] As a preference of the above embodiment, as Figure 1 shown, axial limit can also be carried out by a round nut through a thread 27, and fixed at the axial end face position by screws and glue.

[0067] As a preference of the above embodiment, as shown in the figure, positioning pin holes can be made on the joint surface of the first annular member 4 and the second annular member 5.

[0068] Specifically, by means of a structure in which a blocking device is provided for axial limit, the blocking device is a blocking member circlip 6, a clamping groove 26, and axial limit can also be carried out by a round nut through a thread 27, so as to be used for axial limit and position correction of the circulator, the first annular member 4 and the second annular member 5.

[0069] As the above embodiment, the first annular member 4 may be provided with a radial protrusion 41, and the second annular member 5 may be provided with a second radial protrusion 51.

[0070] As a preference of the above embodiment, as Figure 18 shown, a plurality of the radial protrusion 41 and the second radial protrusion 51 may be provided.

[0071] Specifically, by means of a structure in which the first annular member 4 is further provided with a radial protrusion 41 and the second annular member 5 may be provided with a second radial protrusion 51, so as to be used for positioning the first annular member 4 and the second annular member 5.

[0072] The above has shown and described the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Ball screw pair of a double-layer mating channel structure ball circulator, Characterized in that : It includes a lead screw (1), a nut (2), balls (3), and two ball circulators respectively arranged at both ends of the nut (2). The ball circulator is formed by the mating of a first annular part (4) and a second annular part (5); on the annular mating surface of the mating side of the first annular part (4), there is a first ball raceway (42); on the annular mating surface of the mating side of the second annular part (5), there is a second ball raceway (52), and after the first annular part (4) and the second annular part (5) are mated, a circulating raceway (31) is jointly formed by the first ball raceway (42) and the second ball raceway (52); The lead screw (1) and the nut (2) cooperate to jointly form a spiral raceway (11) for the balls (3) to roll; The ball circulator has a ball inlet and outlet thread raceway (40) that mates with the spiral raceway (11) on the end face of the nut (2); The ball inlet and outlet (45) on the first annular part (4) is connected to the connecting raceway (25) on the nut (2); The balls (3) roll back and forth between the spiral raceway (11) formed by the lead screw (1) and the nut (2), the circulating raceway (31) of the ball circulator, the ball inlet and outlet thread raceway (40), and the connecting raceway (25) of the nut (2).

2. The ball screw pair of the double-layer mating channel structure ball circulator according to claim 1, Characterized in that: On the mating surfaces of the first annular part (4) and the second annular part (5), a plurality of uniformly symmetric ball circulating raceways are generated, and a plurality of uniformly symmetric ball inlet and outlet thread raceways (40) are generated on the first annular part (4).

3. The ball screw pair of the double-layer mating channel structure ball circulator according to claim 2, Characterized in that: On the inner annular surface of the first annular part (4), there is a cutter-type raised block (44) that can be embedded in the spiral raceway (11) on the lead screw (1).

4. The ball screw pair of the double-layer mating channel structure ball circulator according to claim 3, Characterized in that: On the inner side of the cutter-type raised block (44), there are a first ball guiding port (46) and an outer side surface (43). The first ball guiding port (46) and the outer side surface (43) are connected to the spiral raceway (11) to form a ball inlet and outlet structure, and cooperate with the connecting raceway (25) to form a set of closed ball circulating system.

5. The ball screw pair of the double-layer mating channel structure ball circulator according to claim 4, Characterized in that: A blocking component (6) is also provided for axial limit, and the nut (2) is detachably installed integrally with the ball circulator and the blocking component (6).

6. The ball screw pair of the double-layer mating channel structure ball circulator according to claim 5, Characterized in that: Axial limit is carried out by a round nut through a thread (27), and it is fixed at the axial end face position by screws and glue.

7. The ball screw pair of the double-layer opposed channel structure ball circulator according to claim 1, characterized in that: a positioning pin hole is provided on the joint surface of the first annular member (4) and the second annular member (5).

8. The ball screw pair of the double-layer opposed channel structure ball circulator according to claim 1, characterized in that: the first annular member (4) is provided with a radial protrusion (41), and the second annular member (5) is provided with a second radial protrusion (51).

9. The ball screw pair of the double-layer opposed channel structure ball circulator according to claim 8, characterized in that: a plurality of the radial protrusions (41) and the second radial protrusions (51) are provided.

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