CN216279237U - Nut component of seat driver - Google Patents

Abstract

The application discloses a nut component of a seat driver, which comprises a nut seat, a nut and a buffer piece, wherein a first through hole is formed in the nut seat along the front-back direction, a mounting groove is formed in the middle section of the nut seat, the buffer piece is suitable for being clamped in the mounting groove and comprises a bottom plate, an upper padding plate extends upwards from the front side and the rear side of the bottom plate, a second through hole is formed in the upper padding plate along the front-back direction, and a threaded hole is formed in the nut; a floating gap is formed between the buffer piece and the nut seat, the inner diameter of the first through hole is larger than that of the threaded hole, and the nut and the buffer piece can float up and down relative to the nut seat; the left side and the right side of the bottom plate extend downwards to form lower backing plates, the left side and the right side of the nut extend downwards to form limiting plates, the inner sides of the lower backing plates abut against the two sides of the nut seat, and the outer sides of the lower backing plates abut against the inner sides of the limiting plates. Has the advantages of simple structure, convenient assembly and good use effect.

Description

Nut component of seat driver

Technical Field

The application relates to the field of automobile parts, in particular to a seat driver.

Background

A Horizontal Driver (HDM) of a vehicle seat is one of the key moving parts of a vehicle seat position adjustment system. The commonly used automobile seat driver generally comprises a gear box, a screw rod and a nut assembly, a worm gear is arranged in the gear box, a motor is matched with the screw rod to realize screw rod rotation after being decelerated through the gear box, the nut assembly is fixedly connected with a seat and arranged on the screw rod, and the screw rod rotation is used for driving the nut assembly to linearly displace together with the seat. At present, the automobile seat driver with the structure generally has the problems of low strength, poor precision, short service life, inconvenient forming, unstable operation and the like.

Therefore, it is an urgent problem for those skilled in the art to improve the existing seat driver to overcome the above problems.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide an intensity height, the commonality is strong, long service life, reliable and stable, convenient assembling's seat driver.

Still another object of the present application is to provide a method for forming a seat actuator that ensures structural strength, and is efficient and inexpensive to manufacture.

Another object of the present application is to provide a gear box of a seat driver that has high strength, strong versatility and long service life.

Still another object of this application is to provide a simple structure, convenient assembling, excellent in use effect's seat driver's nut assembly.

In order to achieve the above purposes, the technical scheme adopted by the application is as follows: a seat driver, includes gear box, lead screw and nut component, its characterized in that:

the gearbox comprises a box body, a worm and a worm wheel, wherein a first cavity is arranged on the box body in a penetrating mode along the left-right direction, first shaft sleeves are arranged at two ends of the first cavity, first rotating shafts extend out of two ends of the worm, a connecting hole is formed in the first rotating shaft at least one end of the worm, and the worm is arranged in the first cavity in a rotating mode along the left-right direction through the matching of the first rotating shafts and the first shaft sleeves; the end surface of the first rotating shaft is slightly higher or not higher than the end surface of the first shaft sleeve; a second cavity is formed in the box body along the front-back direction, the worm wheel is rotatably arranged in the second cavity along the front-back direction, and the worm is meshed with the worm wheel;

the worm wheel is concentrically and fixedly connected with the screw rod;

the nut assembly comprises a nut seat, a nut and a buffer piece, wherein a first through hole is formed in the nut seat along the front-back direction, an installation groove is formed in the middle section of the nut seat, the buffer piece is suitable for being clamped in the installation groove and comprises a bottom plate, upper backing plates extend upwards from the front side and the rear side of the bottom plate, a second through hole is formed in the upper backing plate along the front-back direction, a threaded hole is formed in the nut, the nut is suitable for being clamped and fixed between the upper backing plates on the two sides, the second through hole is aligned with the threaded hole, and the screw rod is suitable for penetrating through the first through hole, the second through hole and the threaded hole; a floating gap is formed between the buffer piece and the nut seat, the inner diameter of the first through hole is larger than that of the threaded hole, and the nut and the buffer piece can float up and down relative to the nut seat; the left side and the right side of the bottom plate extend downwards to form lower backing plates, the left side and the right side of the nut extend downwards to form limiting plates, the inner sides of the lower backing plates abut against the two sides of the nut seat, and the outer sides of the lower backing plates abut against the inner sides of the limiting plates.

Preferably, the box body comprises a left box cover and a right box cover, a plurality of riveting holes are formed in the left box cover, a plurality of riveting columns extend out of the right box cover, and the left box cover and the right box cover are riveted and fixed through the riveting columns penetrating through the riveting holes; and dovetail supports which are bilaterally symmetrical are respectively arranged above the left box cover and the right box cover. The riveted structure of left case lid and right case lid belongs to the conventional selection, and the setting up of bilateral symmetry forked tail support is used for both sides all can install the motor on the one hand, increases its commonality, and on the other hand can improve the wall thickness homogeneity, reduces the part and warp, improves the part precision.

Preferably, a second shaft sleeve is arranged at the front end of the second chamber, a second rotating shaft extends out of the front end of the worm wheel, and the worm wheel is rotatably arranged in the second chamber through the matching of the second rotating shaft and the second shaft sleeve; a third shaft sleeve is arranged at the rear end of the second chamber, a third rotating shaft extends out of the rear end of the screw rod, and the third rotating shaft penetrates through the worm gear and is rotatably arranged in the third shaft sleeve; an elastic gasket is arranged between the third shaft sleeve and the worm wheel; the rear end of the third rotating shaft is also movably provided with a ball, the rear end of the box body is provided with a cushion block, and the ball is suitable for abutting against the cushion block. The structure enables the worm wheel and the screw rod to rotate more stably and reliably, and the service life of the driver is ensured.

As an improvement, the upper cushion plate extends to the left and right to form an upper positioning block, the nut extends to the front and back to form a lower positioning block, and the upper positioning block and the lower positioning block are in staggered abutting joint and limit the nut to be separated from the buffer piece. The arrangement of the upper positioning block and the lower positioning block enables the nut to be firmly and reliably installed on the buffer piece, and the structural strength of the nut assembly is guaranteed.

As an improvement, the left side and the right side of the nut seat are provided with a yielding groove, and the lower backing plate and the limiting plate are located in the yielding groove, so that the end surfaces of the nut and the buffer piece are not higher than the end surface of the nut seat. Above-mentioned structure makes nut assembly wholeness stronger, also makes the nut seat have better protection effect to nut and bolster.

Preferably, the inner side of the lower backing plate is provided with an arc-shaped lug which abuts against two sides of the nut seat. The arrangement of the arc-shaped convex block can compensate part of processing and assembling errors, and ensure that the lower backing plate can abut against the nut seat; and the arc-shaped structure enables the lower base plate and the nut seat to be in line contact, so that the sliding friction force is reduced, more abrasion allowance can be reserved due to the arrangement of the bulges, and the service life of the nut seat is ensured.

A method of forming a seat actuator comprising the steps of:

s1: respectively processing and forming a box body, a worm wheel, a first shaft sleeve, a screw rod, a nut seat, a nut and a buffer piece;

s2: assembling the box body, the worm wheel, the first shaft sleeve and the screw rod to form a gear box with the screw rod;

s3: assembling the nut seat, the nut and the buffer piece to form a nut component;

s4: and mounting the nut assembly on the screw rod, thereby completing the machining and assembling of the seat base driver.

Preferably, in S1, the box body is formed by riveting a left box cover and a right box cover, the left box cover and the right box cover are respectively formed by die-casting, the outer side edges of the left box cover and the right box cover are rounded, and the radius of the rounded structure is R, where R is greater than 0.5mm and less than 0.6 mm. This application has adopted the fillet structure that increases, increases mobility when die-casting production for processing is easier, and it is littleer to warp, and the part precision is higher.

Preferably, in S1, the worm is injection molded from a PEEK material; in S1, the first sleeve is processed from a powder metallurgy material. The PEEK material has outstanding heat-resistant hydrolysis characteristic, and still keeps excellent dimensional stability under high-temperature and high-humidity environment; the first shaft sleeve is made of powder metallurgy materials, so that fit clearance can be reduced, and poor gluing between plastics can be eliminated.

Preferably, in S1, the machining and molding of the nut holder includes:

s11: drawing a steel material to form an I-shaped section with an I-shaped section, wherein the width A of the I-shaped section is equal to the length a of the nut seat along the front-back direction, and the height B of the I-shaped section is equal to the width B of the nut seat along the left-right direction; a yielding groove of the nut seat is formed at the concave part of the I-shaped section;

s12: cutting the I-shaped section into I-shaped blanks with equal thickness, wherein the thickness C of the I-shaped blanks is equal to the height C of the nut seat along the vertical direction;

s13: milling the I-shaped blank to form an installation groove of the nut seat;

s14: and drilling the I-shaped blank to form a first through hole of the nut seat.

Preferably, in S1, the step of machining the nut includes:

s15: drawing steel to form a cross-shaped section, wherein the cross-shaped section is formed by drawing, the width D of the cross-shaped section is equal to the length D of the nut in the front-back direction, and the height E of the cross-shaped section is equal to the height E of the nut in the up-down direction;

s16: cutting the cross-shaped section into cross blanks with equal thickness, wherein the thickness F of each cross blank is equal to the width F of each nut along the left-right direction;

s17: milling the front and rear end faces of the cross-shaped blank to form a lower positioning block of the nut;

s18: milling the lower end surface of the cross blank to form a limiting plate of the nut;

s19: and drilling and tapping the cross blank to form a threaded hole of the nut.

Preferably, in S1, the buffer member is injection molded, the nut is fixedly mounted on the buffer member by deformation of the buffer member, and then the buffer member and the nut are mounted on the nut seat by interference fit.

To sum up, compare with prior art, the beneficial effect of this application lies in:

(1) the first cavity of this scheme designs for the through-hole for the gear box is controlled the piece and is general, reduces the part kind, only need during the assembly change the worm the direction can.

(2) The first rotating shaft end face of the worm is slightly higher or not higher than the first shaft sleeve end face, so that the outer diameter part of the connecting hole is in constraint of the first shaft sleeve, the connecting hole end of the worm is prevented from cracking, and the service life of the worm is guaranteed.

(3) The nut component of this scheme adopts nut and buffer rigid coupling, floats nut and buffer together and sets up on the nut seat again, under the prerequisite of guaranteeing structural strength and buffer function, makes its effect of floating from top to bottom reach the designing requirement. Specifically, the nuts are arranged between the upper backing plates of the buffer parts in the front-back direction and press the upper backing plates to abut against the nut seats, the limiting plates of the nuts abut against the outer sides of the lower backing plates in the left-right direction and enable the inner sides of the lower backing plates to abut against the nut seats, the upper backing plates and the nut seats are assembled in an interference fit mode in the four directions, the structure is stable and reliable, and the nut seats are enabled to have an up-down floating effect by means of the arrangement of floating gaps between the buffer parts and the nut seats.

Drawings

FIG. 1 is a schematic perspective view of a preferred embodiment according to the present application;

FIG. 2 is a top view of a preferred embodiment according to the present application;

FIG. 3 is a cross-sectional view of the gearbox taken along the line I-I in FIG. 2, according to a preferred embodiment of the present application;

FIG. 4 is a cross-sectional view of the nut assembly of FIG. 2 taken along the line I-I according to a preferred embodiment of the present application;

FIG. 5 is a cross-sectional view taken along line II-II of FIG. 2, in accordance with a preferred embodiment of the present application;

FIG. 6 is a cross-sectional view taken along the III-III direction of FIG. 2, according to a preferred embodiment of the present application;

FIG. 7 is a partial exploded view of a gearbox according to a preferred embodiment of the present application;

FIG. 8 is an exploded view of a nut assembly according to a preferred embodiment of the present application;

FIG. 9 is a perspective view of an I-shaped section bar forming a nut seat in accordance with a preferred embodiment of the present application;

FIG. 10 is a perspective view of an I-shaped blank for forming a nut seat in accordance with a preferred embodiment of the present application;

FIG. 11 is a perspective view of a nut seat according to a preferred embodiment of the present application;

FIG. 12 is a perspective view of a cross-shaped profile of a profiled nut according to a preferred embodiment of the present application;

FIG. 13 is a perspective view of a cross blank for a forming nut according to a preferred embodiment of the present application;

FIG. 14 is a perspective view of a nut according to a preferred embodiment of the present application;

figure 15 is a schematic view of another drawing direction of a formed nut seat profile according to a preferred embodiment of the present application.

In the figure: 1. a gear case; 11. a box body; 11a, a left box cover; 11b, a right box cover; 111. a first chamber; 112. a second chamber; 113. riveting holes; 114. riveting the column; 115. a dovetail bracket; 116. a fillet structure; 12. a worm; 121. a first rotating shaft; 122. connecting holes; 13. a worm gear; 131. a second rotating shaft; 14. a first bushing; 15. a second shaft sleeve; 16. a third shaft sleeve; 17. an elastic washer; 18. a ball bearing; 19. cushion blocks; 2. a screw rod; 21. a third rotating shaft; 3. a nut assembly; 31. a nut seat; 310. a first through hole; 311. mounting grooves; 312. a yielding groove; 32. a nut; 320. a threaded hole; 321. a limiting plate; 322. a lower positioning block; 33. a buffer member; 330. a second through hole; 331. a base plate; 332. an upper base plate; 333. a lower base plate; 3331. a circular arc bump; 334. an upper positioning block; 34. a floating gap; 100. an I-shaped section bar; 200. an I-shaped blank; 300. a cross-shaped section bar; 400. a cross-shaped blank.

Detailed Description

The present application is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

In the description of the present application, it should be noted that, for the orientation words, such as the terms "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship of the drawings, and are only for the convenience of describing the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present application.

It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms "comprises," "comprising," and "having," and any variations thereof, in the description and claims of this application, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1 to 8, a preferred embodiment of the present application includes a gear case 1, a lead screw 2, and a nut assembly 3, the lead screw 2 being used to link the gear case 1 and the nut assembly 3.

As shown in fig. 3, 5 and 7, the gear box 1 of the present embodiment includes a box body 11, a worm 12 and a worm wheel 13, a first chamber 111 is penetratingly disposed on the box body 1 along the left-right direction, first shaft sleeves 14 are disposed at both ends of the first chamber 111, first rotating shafts 121 extend from both ends of the worm 12, a connecting hole 122 is disposed on the first rotating shaft 121 at least one end, and the worm 12 is rotatably disposed in the first chamber 111 along the left-right direction through the cooperation of the first rotating shaft 121 and the first shaft sleeves 14; the end surface of the first rotating shaft 121 is slightly higher or not higher than the end surface of the first shaft sleeve 14; the case 11 is provided with a second chamber 112 along the front-rear direction, the worm wheel 13 is rotatably provided in the second chamber 112 along the front-rear direction, and the worm 12 is engaged with the worm wheel 13. The worm wheel 13 is concentrically and fixedly connected with the screw rod 2. The box body 11 of the embodiment includes a left box cover 11a and a right box cover 11b, the left box cover 11a is provided with four riveting holes 113, the right box cover 11b extends four riveting posts 114, and the left box cover 11a and the right box cover 11b are riveted and fixed by the riveting posts 114 penetrating through the riveting holes 113; dovetail brackets 115 which are symmetrical left and right are respectively arranged above the left box cover 11a and the right box cover 11 b. A second shaft sleeve 15 is arranged at the front end of the second chamber 112, a second rotating shaft 131 extends from the front end of the worm wheel 13, and the worm wheel 13 is rotatably arranged in the second chamber 112 through the matching of the second rotating shaft 131 and the second shaft sleeve 15; a third shaft sleeve 16 is arranged at the rear end of the second chamber 112, a third rotating shaft 21 extends from the rear end of the screw rod 2, and the third rotating shaft 21 passes through the worm wheel 13 and is rotatably arranged in the third shaft sleeve 16; an elastic gasket 17 is arranged between the third shaft sleeve 16 and the worm wheel 13; the rear end of the third rotating shaft 21 is also movably provided with a ball 18, the rear end of the box body 11 is provided with a cushion block 19, and the ball 18 is suitable for abutting against the cushion block 19.

The gearbox 1 with the structure mainly has the following improvement points: (1) the first cavity 11 of the scheme is designed into a through hole, so that left and right parts of the gear box 1 are universal, the types of parts are reduced, and only the direction of the worm 12 needs to be changed during assembly; (2) the end face of the first rotating shaft 121 of the worm 12 is designed to be slightly higher or not higher than the end face of the first shaft sleeve 14, so that the outer diameter part of the connecting hole 122 is in the constraint of the first shaft sleeve 14, the connecting hole 122 end of the worm 12 is prevented from cracking, and the service life of the worm 12 is ensured; (3) compared with the three riveting points in the prior art, the four riveting columns 114 and the riveting holes 113 are added with one riveting point, so that the stress is more uniform after riveting, and the parallelism and gap consistency precision of the gear box 1 is higher; (4) the bilateral symmetry forked tail support 115 is used for both sides all can install the motor on the one hand, increases its commonality, and on the other hand can improve the wall thickness homogeneity, reduces the part and warp, improves part precision (5) second axle sleeve 15, third axle sleeve 16, elastic washer 17, ball 18 and cushion 19 set up and make worm wheel 13, lead screw 2's rotation more steady reliable.

As shown in fig. 4, 6 and 8, the nut assembly 3 of the present embodiment includes a nut seat 31, a nut 32 and a buffer 33, the nut seat 31 is provided with a first through hole 310 along the front-back direction, the middle section of the nut seat 31 is provided with a mounting groove 311, the buffer 33 is suitable for being clamped in the mounting groove 311, the buffer 33 includes a bottom plate 331, upper pads 332 extend upwards from the front and back sides of the bottom plate 331, the upper pads 332 are provided with second through holes 330 along the front-back direction, the nut 32 is provided with a threaded hole 320, the nut 32 is suitable for being clamped between the upper pads 332 at the two sides and aligning the second through hole 330 with the threaded hole 320, and the lead screw 2 is suitable for passing through the first through hole 310, the second through hole 330 and the threaded hole 320; a floating gap 34 is formed between the buffer piece 33 and the nut seat 31, the inner diameter of the first through hole 310 is larger than that of the threaded hole 320, and the nut 32 and the buffer piece 33 can float up and down relative to the nut seat 31; lower backing plates 333 extend downwards from the left side and the right side of the bottom plate 331, limit plates 321 extend downwards from the left side and the right side of the nut 32, the inner sides of the lower backing plates 333 abut against the two sides of the nut seat 31, and the outer sides of the lower backing plates 333 abut against the inner sides of the limit plates 321. The upper pad 332 extends to form an upper positioning block 334 in the left-right direction, the nut 32 extends to form a lower positioning block 322 in the front-back direction, and the upper positioning block 334 and the lower positioning block 322 are in staggered contact with each other to limit the nut 32 from being separated from the buffer 33. The left side and the right side of the nut seat 31 are provided with yielding grooves 312, and the lower cushion plate 333 and the limiting plate 321 are positioned in the yielding grooves 312, so that the end surfaces of the nut 32 and the buffer piece 33 are not higher than the end surface of the nut seat 31. The inner side of the lower backing plate 333 is provided with a circular arc projection 3331, and the circular arc projection 3331 is abutted against two sides of the nut seat 31.

The nut component 3 with the structure mainly has the following improvement points: the nut component 3 of the embodiment is fixedly connected with the buffer piece 33 by the nut 32, and then the nut 32 and the buffer piece 33 are arranged on the nut seat 31 in a floating manner, so that the up-and-down floating effect of the nut component meets the design requirement on the premise of ensuring the structural strength and the buffer function; specifically, the nut 32 is disposed between the upper pads 332 of the cushion member 33 in the front and rear direction, presses the upper pads 332 against the nut holder 31, and the stopper plate 321 of the nut 32 abuts the outer side of the lower pad 333 in the left and right direction, and makes the inner side of the lower pad 333 abut against the nut holder 31, and the pad 332, the lower pad 333, and the nut holder 31 are assembled by interference fit in the four directions, so that they have a stable and reliable structure, and have an effect of floating up and down by the provision of the floating gap 34 between the cushion member 33 and the nut holder 31.

The forming method of the seat driver comprises the following steps:

s1: respectively processing and forming a box body, a worm wheel, a first shaft sleeve, a screw rod, a nut seat, a nut and a buffer piece;

s2: assembling the box body, the worm wheel, the first shaft sleeve and the screw rod to form a gear box with the screw rod;

s3: assembling the nut seat, the nut and the buffer piece to form a nut component;

s4: and mounting the nut assembly on the screw rod, thereby completing the machining and assembling of the seat base driver.

In the above S1, the box body is formed by riveting the left box cover and the right box cover, the left box cover and the right box cover are respectively formed by die casting, as shown in fig. 7, the outer side edges of the left box cover and the right box cover are rounded corner structures 116, the radius of the rounded corner structures 116 is R, and R is greater than 0.5mm and less than 0.6 mm. This embodiment has adopted the fillet structure that increases, increases mobility when die-casting production for processing is easier, and it is littleer to warp, and the part precision is higher.

In S1, the worm is injection molded from a PEEK material. The existing worm is generally made of PA66 material, but PA66 material is typical hygroscopic material, the strength is reduced after water absorption, the size is obviously changed, the stability of parts is poor, the noise in the experimental process is large, and the worm tooth shape is seriously deformed when a box is opened and does not meet the product specification; therefore, the worm of the embodiment is made of the PEEK material, the PEEK material has outstanding heat hydrolysis resistance, and the excellent dimensional stability is still maintained under the high-temperature and high-humidity environment.

In S1, the first sleeve is processed from a powder metallurgy material. The first shaft sleeve of the original scheme is made of POM 500P materials, a failure mode occurs in the experimental process, the abrasion of the first shaft sleeve exceeds the test specification, and the worm is easy to be glued after long-time operation; the first shaft sleeve is made of powder metallurgy materials, so that the fit clearance can be reduced, the transmission stability is improved, and poor gluing among plastics can be eliminated.

As shown in fig. 9 to 11, in S1, the step of forming the nut seat includes:

s11: as shown in fig. 9, a steel material is drawn to form an i-shaped section bar 100 having an i-shaped cross section; as shown in fig. 9 and 11, the width a of the i-shaped section 100 is equal to the length a of the nut seat 31 in the front-rear direction, and the height B of the i-shaped section 100 is equal to the width B of the nut seat 31 in the left-right direction; the concave part of the i-shaped section bar 100 forms a yielding groove 312 of the nut seat 31;

s12: as shown in fig. 10, the i-shaped section bar 100 is cut into i-shaped blanks 200 with equal thickness; as shown in fig. 10 and 11, the thickness C of the i-shaped blank 200 is equal to the height C of the nut seat 31 in the up-down direction;

s13: milling the I-shaped blank 200 to form an installation groove 311 of the nut seat 31;

s14: the i-shaped blank 200 is drilled to form the first through hole 310 of the nut seat 31.

As shown in fig. 15, if the section bar for processing the nut seat is drawn in the direction α and then the mounting groove is milled, the left and right opening directions of the mounting groove are perpendicular to the drawing direction of the section bar, and the columns at both sides of the mounting groove may be deformed by stress, which may cause the bad phenomena of large opening size of the mounting groove, small root size, arched bottom plane, and the like. Therefore, the I-shaped section with the drawing direction is adopted in the embodiment, the opening direction of the left opening and the right opening of the mounting groove formed by milling is parallel to the drawing direction of the I-shaped section, the problem of stress deformation does not exist during machining, the bad phenomena of large opening size, small root size, arched bottom plane and the like do not occur, the drawing requirements can be met without secondary correction machining, the machining quality is guaranteed, and the machining efficiency is improved. And the concave part of the I-shaped section forms a yielding groove of the nut seat, so that the process of milling the yielding groove is omitted, the processing efficiency is further improved, and the consumption of raw materials is reduced.

As shown in fig. 15, if the section bar for processing the nut seat is drawn in the direction shown by β, although the influence of the stress action on the size of the installation groove can be avoided, the installation groove and the abdicating groove need to be milled respectively, which wastes time, labor and materials; and the mounting groove has higher machining precision and is not suitable for concave forming in drawing. Therefore, the drawing direction of the present embodiment i-shaped profile is most preferable.

As shown in fig. 12 to 14, in S1, the step of machining the nut includes:

s15: as shown in fig. 12, a cross-shaped section 300 having a cross-shaped cross section is formed by drawing a steel material; as shown in fig. 12 and 14, the width D of the cross-shaped profile 300 is equal to the length D of the nut 32 in the front-rear direction, and the height E of the cross-shaped profile 300 is equal to the height E of the nut 32 in the up-down direction;

s16: as shown in fig. 13, the cross-shaped profile 300 is cut into cross blanks 400 with equal thickness; as shown in fig. 13 and 14, the thickness F of the cross blank 400 is equal to the width F of the nut 32 in the left-right direction;

s17: milling the front and rear end faces of the cross blank 400 to form the lower positioning block 322 of the nut 32;

s18: milling the lower end surface of the cross blank 400 to form the limiting plate 321 of the nut 32;

s19: the cross blank 400 is drilled and tapped to form the threaded hole 320 of the nut 32.

The lower positioning block and the limiting plate of the nut are both of thin plate structures and are allowed to generate certain elastic deformation, and the internal stress of the section bar cannot influence the performance and the structure of the section bar. Therefore, the drawing direction of the nut profile is mainly considered for the ease of processing thereof. The cross section bar of above-mentioned drawing direction is adopted to this embodiment for the cross stock that the cutting formed only needs just to carry out milling process to preceding, back, the ascending three terminal surface in lower side just can the shaping, has both improved machining efficiency, has reduced the consumption of raw and other materials again.

In the above S1, the buffer member is injection molded, the nut is fixedly mounted on the buffer member through deformation of the buffer member, and then the buffer member and the nut are mounted on the nut seat through interference fit.

The foregoing has described the general principles, essential features, and advantages of the application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, which are merely illustrative of the principles of the application, but that various changes and modifications may be made without departing from the spirit and scope of the application, and these changes and modifications are intended to be within the scope of the application as claimed. The scope of protection claimed by this application is defined by the following claims and their equivalents.

Claims (4)

1. A nut assembly for a seat actuator, comprising: the nut assembly comprises a nut seat, a nut and a buffer piece, wherein a first through hole is formed in the nut seat along the front-back direction, an installation groove is formed in the middle section of the nut seat, the buffer piece is suitable for being clamped in the installation groove and comprises a bottom plate, upper backing plates extend upwards from the front side and the rear side of the bottom plate, a second through hole is formed in the upper backing plate along the front-back direction, a threaded hole is formed in the nut, the nut is suitable for being clamped and fixed between the upper backing plates on the two sides, the second through hole is aligned with the threaded hole, and the screw rod is suitable for penetrating through the first through hole, the second through hole and the threaded hole; a floating gap is formed between the buffer piece and the nut seat, the inner diameter of the first through hole is larger than that of the threaded hole, and the nut and the buffer piece can float up and down relative to the nut seat; the left side and the right side of the bottom plate extend downwards to form lower backing plates, the left side and the right side of the nut extend downwards to form limiting plates, the inner sides of the lower backing plates abut against the two sides of the nut seat, and the outer sides of the lower backing plates abut against the inner sides of the limiting plates.

2. The seat driver nut assembly of claim 1, wherein: the upper base plate extends to the left and right to form an upper positioning block, the nut extends to the front and back to form a lower positioning block, and the upper positioning block and the lower positioning block are in staggered abutting joint and limit the nut to be separated from the buffer piece.

3. The seat driver nut assembly of claim 1, wherein: the nut seat left and right sides has seted up the groove of stepping down, the lower bolster with the limiting plate is located the inslot of stepping down for the nut with the terminal surface of bolster is all not higher than the terminal surface of nut seat.

4. The seat driver nut assembly of claim 1, wherein: and the inner side of the lower backing plate is provided with an arc-shaped lug which is abutted against two sides of the nut seat.

Images