CN115031001B

CN115031001B - Seat horizontal driving system, assembly and assembling method

Info

Publication number: CN115031001B
Application number: CN202210967168.4A
Authority: CN
Inventors: 顾来法; 邬华东; 杨祖军; 赵总辉; 应超越; 李孝宁
Original assignee: Ningbo Shuanglin Automobile Parts Co ltd
Current assignee: Ningbo Shuanglin Automobile Parts Co ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-11-04
Anticipated expiration: 2042-08-12
Also published as: CN115031001A

Abstract

The application discloses a seat horizontal driving system, an assembly and an assembling method, wherein the seat horizontal driving system comprises a first screw rod, a second screw rod and a nut component, the first screw rod and the second screw rod are parallel and have the same spiral direction, and the first screw rod and the second screw rod respectively penetrate through and are in threaded connection with the nut component; the power source is suitable for driving the first screw rod to rotate in the forward direction and enabling the nut component to move in the forward direction along the second screw rod; the power source is suitable for driving the second screw rod to rotate reversely, and the nut component moves reversely along the first screw rod. Has the advantages of high strength, long service life, stability and reliability.

Description

Seat horizontal driving system, assembly and assembling method

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. With the increasing improvement of the living standard of people and the rapid development of new energy automobiles, the requirements of people on the comfort and the functionality of automobile seats are higher and higher. The existing HDM can not completely meet the driving requirement of a new energy automobile seat.

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

Disclosure of Invention

An object of the present application is to provide a seat horizontal driving system that has high strength, long service life, and is stable and reliable.

It is another object of the present application to provide a seat horizontal drive assembly having the seat horizontal drive system described above.

It is a further object of the present application to provide a method of assembling the seat horizontal drive system described above.

In order to achieve the above purposes, the technical scheme adopted by the application is as follows: a seat horizontal driving system comprises a first screw rod, a second screw rod and a nut assembly, wherein the first screw rod and the second screw rod are parallel and have the same spiral direction, and the first screw rod and the second screw rod respectively penetrate through and are in threaded connection with the nut assembly; the power source is suitable for driving the first screw rod to rotate in the forward direction and enabling the nut component to move in the forward direction along the second screw rod; the power source is suitable for driving the second screw rod to rotate reversely, and the nut component moves along the first screw rod reversely.

Furthermore, the nut component comprises a nut seat, a first one-way bearing, a second one-way bearing, a first nut and a second nut, the outer side of the first one-way bearing is fixedly connected with the nut seat, the inner side of the first one-way bearing is fixedly connected with the first nut, the first lead screw penetrates through and is in threaded connection with the first nut, the first one-way bearing is suitable for forward locking and reverse rotation, the outer side of the second one-way bearing is fixedly connected with the nut seat, the inner side of the second one-way bearing is fixedly connected with the second nut, the second lead screw penetrates through and is in threaded connection with the second nut, and the second one-way bearing is suitable for reverse locking and forward rotation.

Furthermore, the nut seat comprises an outer shell seat, a first inner shell seat and a second inner shell seat, the first one-way bearing and the first nut are arranged in the first inner shell seat, the second one-way bearing and the second nut are arranged in the second inner shell seat, and the first inner shell seat and the second inner shell seat are arranged in a split manner and are suitable for being installed in the outer shell seat in parallel.

Furthermore, two accommodating cavities are formed in the outer shell seat, the two accommodating cavities are parallel and are flush end to end, and the first inner shell seat and the second inner shell seat are suitable for being respectively embedded and fixed in the accommodating cavities; the outer shell seat comprises an upper shell and a lower shell which are arranged in a split mode, the upper shell and the lower shell are in butt joint through fasteners and cover the first inner shell seat and the second inner shell seat to form the nut assembly.

The power source forward operation is suitable for driving the first reduction gearbox to drive the first lead screw to rotate forward through the linkage assembly, and the power source reverse operation is suitable for driving the second reduction gearbox to drive the second lead screw to rotate reversely through the linkage assembly.

Furthermore, the linkage assembly comprises a rack, a driving shaft, a first driven shaft, a second driven shaft, a first one-way gear set and a second one-way gear set, the driving shaft, the first driven shaft and the second driven shaft are respectively and rotatably arranged on the rack, the driving shaft is connected with the power source, the first driven shaft is connected with the first reduction gearbox, the second driven shaft is connected with the second reduction gearbox, the first one-way gear set is arranged between the driving shaft and the first driven shaft, and the second one-way gear set is arranged between the driving shaft and the second driven shaft; the driving shaft is suitable for selectively driving the first one-way gear set or the second one-way gear set to move, when the power source drives the driving shaft to rotate in the forward direction, the driving shaft is suitable for driving the first driven shaft to rotate in the forward direction through the first one-way gear set, and when the power source drives the driving shaft to rotate in the reverse direction, the driving shaft is suitable for driving the second driven shaft to rotate in the reverse direction through the second one-way gear set;

the first one-way gear set comprises a third one-way bearing, a first driving gear, a first transition gear and a first driven gear, the inner side of the third one-way bearing is concentrically and fixedly connected with the driving shaft, the first driving gear is concentrically and fixedly connected with the outer side of the third one-way bearing, the first transition gear is rotationally arranged on the rack, the first driven gear is concentrically and fixedly connected with the first driven shaft, the first driving gear is meshed with the first transition gear, the first transition gear is meshed with the first driven gear, and the third one-way bearing is suitable for forward locking and reverse rotation;

the second unidirectional gear set comprises a fourth unidirectional bearing, a second driving gear, a second transition gear and a second driven gear, the inner side of the fourth unidirectional bearing is fixedly connected with the driving shaft concentrically, the second driving gear is fixedly connected with the outer side of the fourth unidirectional bearing concentrically, the second transition gear is rotatably arranged on the rack, the second driven gear is fixedly connected with the second driven shaft concentrically, the second driving gear is meshed with the second transition gear, the second transition gear is meshed with the second driven gear, and the fourth unidirectional bearing is suitable for reverse locking and forward rotation.

Further, the first reduction gearbox comprises a first box body, a first worm and a first worm wheel, the first worm is transversely and rotatably arranged in the first box body, the first worm wheel is longitudinally and rotatably arranged in the first box body, the first worm is meshed with the first worm wheel, the first worm is concentrically and fixedly connected with the first driven shaft, and the first worm wheel is concentrically and fixedly connected with the first lead screw;

the second reduction gearbox comprises a second box body, a second worm and a second worm wheel, the second worm is transversely and rotatably arranged in the second box body, the second worm wheel is longitudinally and rotatably arranged in the second box body, the second worm is meshed with the second worm wheel, the second worm is concentrically and fixedly connected with the second driven shaft, and the second worm wheel is concentrically and fixedly connected with the second screw rod;

the first and second worms are arranged co-linearly, the first and second driven shafts are arranged co-linearly; the first reduction gearbox and the second reduction gearbox are arranged in a back-to-back manner, and the first driven shaft and the second driven shaft are respectively connected with the first reduction gearbox and the second reduction gearbox from two sides;

the transmission ratio between the driving shaft and the first driven shaft is 1, and the transmission ratio between the driving shaft and the second driven shaft is 1.

Further, the rack is of a coating structure, and the first reduction gearbox and the second reduction gearbox are suitable for being embedded and fixed in the rack; a positioning plate is longitudinally arranged in the middle of the rack, and the first reduction gearbox and the second reduction gearbox are symmetrically arranged on two sides of the positioning plate; a first limiting hole is formed in the first reduction gearbox along the transverse direction, a second limiting hole is formed in the second reduction gearbox along the transverse direction, and a third limiting hole is formed in the rack along the transverse direction; the first limiting hole, the second limiting hole and the third limiting hole are concentrically arranged, and the linkage assembly further comprises a pin shaft which is suitable for simultaneously penetrating through the first limiting hole, the second limiting hole and the third limiting hole and limiting and fixing the first reduction gearbox and the second reduction gearbox on the rack; and two sides of the rack are provided with a cover, and the cover is suitable for covering the first one-way gear set and the second one-way gear set.

A seat horizontal driving assembly comprises the seat horizontal driving system and a power source; the power source is a double-shaft motor, and the seat horizontal driving system is provided with two groups which are respectively connected with two sides of the double-shaft motor.

A method of assembling a seat horizontal drive system, comprising the steps of:

s1, assembling a first screw rod and a first reduction gearbox to form a first driving module, and assembling a second screw rod and a second reduction gearbox to form a second driving module;

s2, assembling the first one-way bearing, the first nut and the first inner shell seat to form a first nut module, and assembling the second one-way bearing, the second nut and the second inner shell seat to form a second nut module;

s3, assembling the first nut module and the first driving module, assembling the second nut module and the second driving module, and ensuring that the screwing amount of the first nut relative to the first screw rod is equal to that of the second nut relative to the second screw rod;

s4, assembling the first driving module assembled with the first nut module and the second driving module assembled with the second nut module with the linkage assembly, and ensuring that the first nut module and the second nut module are parallel and parallel end to end;

and S5, assembling the shell base on the first nut module and the second nut module to form an integral nut assembly.

Compared with the prior art, the beneficial effect of this application lies in: (1) The double-screw structure is adopted, and compared with the existing single-screw structure, the double-screw structure has stronger bending resistance and higher bearing strength, can prolong the length of the screw rod and realizes larger stroke adjustment; (2) The first screw rod and the second screw rod are suitable for respectively driving the nut component to move forwards and backwards, namely, the scheme is actually driven by the single screw rod in a time-sharing mode, and compared with a structure that the double screw rods simultaneously drive the nut component to reciprocate, the structure has longer service life; (3) This scheme is when the monofilament pole drive, and another lead screw can regard as the guide arm, guarantees that the whole nut assembly can not take place to rotate, compares current single lead screw structure, can save the setting of linear guide rail.

Drawings

Fig. 1 is a 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 isbase:Sub>A partial cross-sectional view taken alongbase:Sub>A-base:Sub>A in fig. 2, according tobase:Sub>A preferred embodiment of the present application.

FIG. 4 is a cross-sectional view taken along the direction B-B in FIG. 2, according to a preferred embodiment of the present application.

Fig. 5 is an exploded view of a preferred embodiment according to the present application.

Fig. 6 is a schematic view of the internal structure of a nut assembly according to a preferred embodiment of the present application.

FIG. 7 is a half cross-sectional view of the nut assembly in the direction of the first nut axis 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 a linkage assembly according to a preferred embodiment of the present application.

FIG. 10 is a half sectional view of a linkage assembly according to a preferred embodiment of the present application.

FIG. 11 is an exploded view of a linkage assembly according to a preferred embodiment of the present application.

Fig. 12 is a schematic view of a structure constituting a seat horizontal driving assembly according to a preferred embodiment of the present application.

In the figure: 100. a power source; 1. a first lead screw; 2. a second screw rod; 3. a nut assembly; 31. a nut seat; 32. a first one-way bearing; 33. a second one-way bearing; 34. a first nut; 35. a second nut; 311. a housing base; 312. a first inner housing seat; 313. a second inner housing seat; 3111. an accommodating chamber; 311a, an upper shell; 311b, a lower housing; 3121. a first stopper; 3131. a second limiting block; 4. a first reduction gearbox; 41. a first case; 42. a first worm; 411. a first limit hole; 43. a first worm gear; 5. a second reduction gearbox; 51. a second case; 52. a second worm; 53. a second worm gear; 511. a second limiting hole; 6. a linkage assembly; 61. a frame; 62. a drive shaft; 63. a first driven shaft; 64. a second driven shaft; 65. a first one-way gear set; 66. a second one-way gear set; 67. a pin shaft; 68. a housing; 611. positioning a plate; 612. a third limiting hole; 651. a third one-way bearing; 652. a first drive gear; 653. a first transition gear; 654. a first driven gear; 661. a fourth one-way bearing; 662. a second driving gear; 663. a second transition gear; 664. a second driven gear.

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 described below or between the technical features may form a new embodiment.

In the description of the present application, it should be noted that, for the terms of orientation, such as "central", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate orientations and positional relationships based on the drawings, and are only for convenience of description and simplification of 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 should be 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 explicitly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As is well known, one of the structural differences between a conventional fuel vehicle and a new energy vehicle is as follows: in the traditional fuel vehicle, because of the existence of a structure such as a tail gas emission system and the like which needs to be arranged on a chassis, the floor of the chassis is difficult to be leveled, and more or less height drop exists; and the new energy automobile can be connected into a flat floor by only installing a storage battery in the chassis. Based on this, the seat of the new energy automobile often has a larger horizontal adjustment stroke to increase the comfort and functionality of the automobile seat. For this reason, the seat horizontal driving system needs to design the length of the screw rod matched with the stroke, but the problem of insufficient strength exists when the length of the screw rod is too large, and the screw rod is easy to flex, so that the transmission of the seat horizontal driving system is not stable.

Based on above-mentioned problem, the purpose of this application is to increase the intensity of lead screw, so adopt two lead screw structures, this application has still adopted the mode of monofilament pole timesharing drive moreover to guarantee the life of every lead screw, concrete structure is as follows:

as shown in fig. 1 to 11, a preferred embodiment of the present application includes a first lead screw 1, a second lead screw 2 and a nut component 3, the first lead screw 1 and the second lead screw 2 are parallel and have the same spiral direction, and the first lead screw 1 and the second lead screw 2 respectively penetrate through and are in threaded connection with the nut component 3; the power source 100 is suitable for driving the first lead screw 1 to rotate in a forward direction and enabling the nut component 3 to move in a forward direction along the second lead screw 2; the power source 100 is adapted to drive the second lead screw 2 to rotate in reverse and to move the nut component 3 in reverse along the first lead screw 1.

Based on the seat horizontal driving system, the following advantages are achieved: (1) The embodiment adopts a double-screw structure, has stronger bending resistance and higher bearing strength compared with the existing single-screw structure, can prolong the length of the screw rod and realize larger stroke adjustment; (2) The double-screw rod is suitable for respectively driving the nut component to move forward and move backward, namely the scheme is actually driven by the single-screw rod in a time-sharing manner, and has longer service life compared with a structure that the double-screw rod simultaneously drives the nut component to reciprocate; (3) In the scheme, when the single screw rod is driven, the other screw rod can be used as a guide rod, so that the whole nut assembly is prevented from rotating, and compared with the conventional single screw rod structure, the linear guide rail can be omitted.

As shown in fig. 6 to 8, in order to realize the time-sharing driving of the single-screw rod, the nut assembly 3 of the present embodiment includes a nut seat 31, a first one-way bearing 32, a second one-way bearing 33, a first nut 34 and a second nut 35, the outer side of the first one-way bearing 32 is fixedly connected to the nut seat 31, the inner side of the first one-way bearing 32 is fixedly connected to the first nut 34, the first screw rod 1 passes through and is screwed to the first nut 34, the first one-way bearing 32 is suitable for forward locking and reverse rotation, the outer side of the second one-way bearing 33 is fixedly connected to the nut seat 31, the inner side of the second one-way bearing 33 is fixedly connected to the second nut 35, the second screw rod 2 passes through and is screwed to the second nut 35, and the second one-way bearing 33 is suitable for reverse locking and forward rotation.

The working principle of the nut component 3 is as follows: when the power source 100 drives the first lead screw 1 to rotate forward, the first one-way bearing 32 cannot rotate, that is, the nut seat 31, the first one-way bearing 32 and the first nut 34 are an integral structure, and the first lead screw 1 and the nut assembly 3 form a lead screw slider structure, so that the first lead screw 1 can drive the nut assembly 3 to move forward at the same time; the nut component 3 is in the forward direction and simultaneously, relative rotation must be provided between the second screw rod 2 and the second nut 35, the second screw rod 2 has a self-locking function (realized by a second reduction gearbox 5 described below), rotation cannot occur, only the second nut 35 can rotate, the forward rotation design of the second one-way bearing 33 just provides the rotation condition of the second nut 35, namely the second screw rod 2, the second one-way bearing 33 and the second nut 35 can be used as a guide rail of a screw rod sliding block structure. When the power source 100 drives the second lead screw 2 to rotate reversely, the work flow is the reverse, and the description is not repeated here.

It can be seen that when the nut component 3 moves forward, only the first screw rod 1 is needed to output power, the second screw rod 2 does not rotate, when the nut component 3 moves backward, only the second screw rod 2 is needed to output power, and the first screw rod 1 does not rotate, so that the single-screw rod time-sharing driving is realized, and compared with a structure that the double screw rods simultaneously drive the nut component 3 to reciprocate, the nut component has a service life which is close to two times.

As shown in fig. 6 to 8, in consideration of feasibility and convenience of assembly of the seat horizontal driving system, the nut holder 31 of the present embodiment is divided into three parts, i.e., an outer shell holder 311, a first inner shell holder 312 and a second inner shell holder 313, the first one-way bearing 32 and the first nut 34 are disposed in the first inner shell holder 312, the second one-way bearing 33 and the second nut 35 are disposed in the second inner shell holder 313, and the first inner shell holder 312 and the second inner shell holder 313 are separately disposed and adapted to be installed in parallel in the outer shell holder 311.

Further, two accommodating cavities 3111 are formed in the outer shell seat 311, the two accommodating cavities 3111 are parallel and flush end to end, and the first inner shell seat 312 and the second inner shell seat 313 are suitable for being respectively embedded and fixed in the accommodating cavities 3111; the outer housing 311 includes an upper housing 311a and a lower housing 311b that are separately disposed, and the upper housing 311a and the lower housing 311b are coupled by a fastening member and cover the first inner housing 312 and the second inner housing 313 to form the nut assembly 3. The upper case 311a and the lower case 311b are divided in half along the center plane of the receiving cavity 3111 in this embodiment. The first inner housing seat 312 is further clamped with a first limit block 3121, which is matched with the accommodating cavity 3111 for limiting axial displacement of the first one-way bearing 32 and the first nut 34; the second inner housing seat 313 is further clamped with a second limiting block 3131, which is matched with the accommodating cavity 3111 for limiting axial displacement of the second one-way bearing 33 and the second nut 35. The structure has the advantages of convenient assembly and firm fixation.

As a conventional design, as shown in figures 1 to 5, a first reduction gearbox 4 is connected to the first screw rod 1, and a second reduction gearbox 5 is connected to the second screw rod 2. It can be seen that the first screw rod 1, the second screw rod 2, the first reduction gearbox 4 and the second reduction gearbox 5 of the present embodiment are all of conventional structures, that is, the present embodiment is improved and optimized on the basis of the above structures, the first screw rod 1, the second screw rod 2, the first reduction gearbox 4 and the second reduction gearbox 5 can all adopt standard parts, the independent design and independent manufacturing cost of the first screw rod 1, the second screw rod 2, the first reduction gearbox 4 and the second reduction gearbox 5 can be saved, and the present embodiment has higher economy and applicability.

Obviously, the first reduction gearbox 4 and the second reduction gearbox 5 can be respectively connected with the power source 100 to realize the forward rotation of the first screw rod 1 and the reverse rotation of the second screw rod 2, namely the driving of the dual power source 100. However, in consideration of the economy of the system and the utilization rate of space, the present embodiment is preferably driven by a single power source 100, and for this purpose, a linkage assembly 6 is provided, the linkage assembly 6 is respectively connected with the first reduction gearbox 4 and the second reduction gearbox 5, the forward operation of the power source 100 is suitable for driving the first reduction gearbox 4 to drive the first lead screw 1 to rotate forward through the linkage assembly 6, and the reverse operation of the power source 100 is suitable for driving the second reduction gearbox 5 to drive the second lead screw 2 to rotate reversely through the linkage assembly 6.

As shown in fig. 9 to 11, the linkage assembly 6 adopts a gear set and shaft transmission, and specifically includes a frame 61, a driving shaft 62, a first driven shaft 63, a second driven shaft 64, a first one-way gear set 65 and a second one-way gear set 66, the driving shaft 62, the first driven shaft 63 and the second driven shaft 64 are respectively rotatably disposed on the frame 61, the driving shaft 62 is connected with a power source 100, the first driven shaft 63 is connected with the first reduction gearbox 4, the second driven shaft 64 is connected with the second reduction gearbox 5, the first one-way gear set 65 is disposed between the driving shaft 62 and the first driven shaft 63, and the second one-way gear set 66 is disposed between the driving shaft 62 and the second driven shaft 64; the driving shaft 62 is adapted to alternatively drive the first one-way gear set 65 or the second one-way gear set 66 to move, when the power source 100 drives the driving shaft 62 to rotate in the forward direction, the driving shaft 62 is adapted to drive the first driven shaft 63 to rotate in the forward direction through the first one-way gear set 65, and when the power source 100 drives the driving shaft 62 to rotate in the reverse direction, the driving shaft 62 is adapted to drive the second driven shaft 64 to rotate in the reverse direction through the second one-way gear set 66.

More specifically, as shown in fig. 10 and 11, the first unidirectional gear set 65 and the second unidirectional gear set 66 both adopt a unidirectional bearing structure to realize unidirectional driving. The first one-way gear set 65 includes a third one-way bearing 651, a first driving gear 652, a first transition gear 653 and a first driven gear 654, the inner side of the third one-way bearing 651 is concentrically and fixedly connected with the driving shaft 62, the first driving gear 652 is concentrically and fixedly connected with the outer side of the third one-way bearing 651, the first transition gear 653 is rotatably disposed on the frame 61, the first driven gear 654 is concentrically and fixedly connected with the first driven shaft 63, the first driving gear 652 is engaged with the first transition gear 653, the first transition gear 653 is engaged with the first driven gear 654, and the third one-way bearing 651 is suitable for forward locking and reverse rotation. As a mirror image structure, the second unidirectional gear set 66 includes a fourth unidirectional bearing 661, a second driving gear 662, a second transition gear 663 and a second driven gear 664, the inner side of the fourth unidirectional bearing 661 is concentrically and fixedly connected with the driving shaft 62, the second driving gear 662 is concentrically and fixedly connected with the outer side of the fourth unidirectional bearing 661, the second transition gear 663 is rotatably disposed on the frame 61, the second driven gear 664 is concentrically and fixedly connected with the second driven shaft 64, the second driving gear 662 is engaged with the second transition gear 663, the second transition gear 663 is engaged with the second driven gear 664, and the fourth unidirectional bearing 661 is suitable for reverse locking and forward rotation. The first driving gear 652 and the first driven gear 654 have the same tooth number, so that the transmission ratio between the driving shaft 62 and the first driven shaft 63 is 1, the second driving gear 662 and the second driven gear 664 have the same tooth number, and the transmission ratio between the driving shaft 62 and the second driven shaft 64 is 1; therefore, the structural design of the existing first screw rod 1, the second screw rod 2, the first reduction gearbox 4, the second reduction gearbox 5 and the power source 100 does not need to be changed.

As shown in fig. 3 and 4, as a conventional arrangement, the first reduction gearbox 4 comprises a first box 41, a first worm 42 and a first worm wheel 43, the first worm 42 is transversely and rotatably arranged in the first box 41, the first worm wheel 43 is longitudinally and rotatably arranged in the first box 41, the first worm 42 is meshed with the first worm wheel 43, the first worm 42 is concentrically and fixedly connected with a first driven shaft 63, and the first worm wheel 43 is concentrically and fixedly connected with the first lead screw 1. The second reduction box 5 comprises a second box body 51, a second worm 52 and a second worm wheel 53, the second worm 52 is transversely and rotatably arranged in the second box body 51, the second worm wheel 53 is longitudinally and rotatably arranged in the second box body 51, the second worm 52 is meshed with the second worm wheel 53, the second worm 52 is concentrically and fixedly connected with a second driven shaft 64, and the second worm wheel 53 is concentrically and fixedly connected with the second lead screw 2.

In the present embodiment, the first worm 42 and the second worm 52 are arranged in line, and the first follower shaft 63 and the second follower shaft 64 are arranged in line; further, the first reduction gearbox 4 and the second reduction gearbox 5 are arranged in a back-to-back mode, and the first driven shaft 63 and the second driven shaft 64 are connected with the first reduction gearbox 4 and the second reduction gearbox 5 from two sides respectively. Because the space in the vehicle is limited, the seat horizontal driving system is not easy to occupy too large space, and therefore the first screw rod 1 and the second screw rod 2 are arranged close to each other as much as possible; based on this, the closer the first reduction gearbox 4 and the second reduction gearbox 5 are, the better, the linkage assembly 6 is not suitable for being arranged between the first reduction gearbox 4 and the second reduction gearbox 5, and therefore the first reduction gearbox 4 and the second reduction gearbox 5 are arranged in a back-to-back mode, and the whole compact type of the seat horizontal driving system can be guaranteed. It can be understood that the first reduction gearbox 4 and the second reduction gearbox 5 are left and right parts in mirror image structures, and correspond to left and right reduction gearboxes in the existing seat horizontal driving assembly, and extra design is not needed.

As shown in fig. 1 to 4, the frame 61 is also a mounting base for the first reduction gearbox 4 and the second reduction gearbox 5, the frame 61 of the present embodiment is a cladding structure, and the first reduction gearbox 4 and the second reduction gearbox 5 are suitable for being embedded and fixed in the frame 61. As shown in fig. 11, a positioning plate 611 is longitudinally arranged in the middle of the frame 61, and the first reduction gearbox 4 and the second reduction gearbox 5 are symmetrically arranged on two sides of the positioning plate 611. As shown in fig. 5, a first limiting hole 411 is transversely formed in the first reduction gearbox 4, a second limiting hole 511 is transversely formed in the second reduction gearbox 5, and a third limiting hole 612 is transversely formed in the frame 61; the first limiting hole 411, the second limiting hole 511 and the third limiting hole 612 are concentrically arranged, the linkage assembly 6 further comprises a pin shaft 67, and the pin shaft 67 is suitable for simultaneously penetrating through the first limiting hole 411, the second limiting hole 511 and the third limiting hole 612 and limiting and fixing the first reduction gearbox 4 and the second reduction gearbox 5 on the rack 61. As shown in fig. 11, the housing 61 is provided with a cover 68 at both sides thereof, and the cover 68 is adapted to cover the first and second one-way gear sets 65 and 66.

As shown in fig. 12, the present application further provides a seat horizontal drive assembly, the seat horizontal drive system, and a power source 100; the power source 100 is a double-shaft motor, and the seat horizontal driving system has two sets, and is respectively connected to both sides of the double-shaft motor. Namely, the seat horizontal driving assembly of the present application is a four-screw structure, when the seat horizontal driving assembly moves forward, the two first screws 1 on both sides rotate, and when the seat horizontal driving assembly moves backward, the two second screws 2 on both sides rotate and are all controlled by the forward and reverse rotation of the double-shaft motor.

The application also provides an assembling method of the seat horizontal driving system, which comprises the following steps:

the method comprises the following steps: and assembling the first screw rod and the first reduction gearbox to form a first driving module, and assembling the second screw rod and the second reduction gearbox to form a second driving module.

Step two: and assembling the first one-way bearing, the first nut and the first inner shell seat to form a first nut module, and assembling the second one-way bearing, the second nut and the second inner shell seat to form a second nut module.

Step three: and assembling the first nut module and the first driving module, assembling the second nut module and the second driving module, and ensuring that the screwing amount of the first nut relative to the first screw rod is equal to that of the second nut relative to the second screw rod.

Step four: and assembling the first driving module assembled with the first nut module and the second driving module assembled with the second nut module with the linkage assembly, and ensuring that the first nut module and the second nut module are parallel and level from head to tail.

Step five: assembling the housing seat to the first nut module and the second nut module to form an integral nut assembly.

It can be expected that if the nut assembly is of an integrated structure, the difficulty of synchronously screwing the first screw rod and the second screw rod is high (the first reduction gearbox needs to be driven to rotate forwards and the second reduction gearbox needs to rotate backwards at the same time), so that the nut assembly and the screw rod are assembled by adopting a mode of firstly sub-assembling (step three) and then sub-assembling (step five), the installation difficulty is reduced, and the assembly efficiency is ensured.

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

1. A seat horizontal drive system, characterized by: the screw rod mechanism comprises a first screw rod, a second screw rod and a nut assembly, wherein the first screw rod and the second screw rod are parallel and have the same spiral direction, and the first screw rod and the second screw rod respectively penetrate through and are in threaded connection with the nut assembly; the power source is suitable for driving the first screw rod to rotate in the forward direction and enabling the nut component to move in the forward direction along the second screw rod; the power source is suitable for driving the second screw rod to rotate reversely and enabling the nut component to move reversely along the first screw rod;

the nut assembly comprises a nut seat, a first one-way bearing, a second one-way bearing, a first nut and a second nut, wherein the outer side of the first one-way bearing is fixedly connected with the nut seat, the inner side of the first one-way bearing is fixedly connected with the first nut, the first lead screw penetrates through and is in threaded connection with the first nut, the first one-way bearing is suitable for forward locking and reverse rotation, the outer side of the second one-way bearing is fixedly connected with the nut seat, the inner side of the second one-way bearing is fixedly connected with the second nut, the second lead screw penetrates through and is in threaded connection with the second nut, and the second one-way bearing is suitable for reverse locking and forward rotation;

when the power source drives the first lead screw to rotate forward, the first one-way bearing cannot rotate, namely the nut seat, the first one-way bearing and the first nut are integrated into a whole, and the first lead screw and the nut assembly form a lead screw slider structure, so that the first lead screw can drive the nut assembly to move forward at the same time; when the nut component moves forward, the second screw rod and the second nut rotate relatively, the second screw rod has a self-locking function, cannot rotate and only can rotate the second nut, and the forward rotation of the second one-way bearing provides a condition for rotating the second nut, namely the second screw rod, the second one-way bearing and the second nut can be used as guide rails of a screw rod sliding block structure; when the power source drives the second screw rod to rotate reversely, the working procedures are opposite.

2. A seat horizontal drive system according to claim 1, wherein: the nut seat comprises an outer shell seat, a first inner shell seat and a second inner shell seat, the first one-way bearing and the first nut are arranged in the first inner shell seat, the second one-way bearing and the second nut are arranged in the second inner shell seat, and the first inner shell seat and the second inner shell seat are arranged in a split mode and are suitable for being arranged in the outer shell seat in parallel.

3. A seat horizontal drive system according to claim 2, wherein: the first inner shell seat and the second inner shell seat are suitable for being respectively embedded and fixed in the accommodating cavities; the outer shell seat comprises an upper shell and a lower shell which are arranged in a split mode, the upper shell and the lower shell are in butt joint through fasteners and wrap the first inner shell seat and the second inner shell seat to form the nut assembly.

4. A seat horizontal drive system according to claim 2, wherein: the power source device comprises a first screw rod, a first reduction gearbox, a second reduction gearbox and a linkage assembly, wherein the first reduction gearbox is connected with the first screw rod, the second reduction gearbox is connected with the second screw rod, the linkage assembly is respectively connected with the first reduction gearbox and the second reduction gearbox, the power source forward operation is suitable for driving the first reduction gearbox to drive the first screw rod to rotate forward through the linkage assembly, and the power source reverse operation is suitable for driving the second reduction gearbox to drive the second screw rod to rotate reversely through the linkage assembly.

5. The seat horizontal drive system of claim 4, wherein: the linkage assembly comprises a rack, a driving shaft, a first driven shaft, a second driven shaft, a first one-way gear set and a second one-way gear set, the driving shaft, the first driven shaft and the second driven shaft are respectively and rotatably arranged on the rack, the driving shaft is connected with the power source, the first driven shaft is connected with the first reduction gearbox, the second driven shaft is connected with the second reduction gearbox, the first one-way gear set is arranged between the driving shaft and the first driven shaft, and the second one-way gear set is arranged between the driving shaft and the second driven shaft; the driving shaft is suitable for selectively driving the first one-way gear set or the second one-way gear set to move, when the power source drives the driving shaft to rotate in the forward direction, the driving shaft is suitable for driving the first driven shaft to rotate in the forward direction through the first one-way gear set, and when the power source drives the driving shaft to rotate in the reverse direction, the driving shaft is suitable for driving the second driven shaft to rotate in the reverse direction through the second one-way gear set;

the first one-way gear set comprises a third one-way bearing, a first driving gear, a first transition gear and a first driven gear, the inner side of the third one-way bearing is concentrically and fixedly connected with the driving shaft, the first driving gear is concentrically and fixedly connected with the outer side of the third one-way bearing, the first transition gear is rotatably arranged on the rack, the first driven gear is concentrically and fixedly connected with the first driven shaft, the first driving gear is meshed with the first transition gear, the first transition gear is meshed with the first driven gear, and the third one-way bearing is suitable for forward locking and reverse rotation;

6. The seat horizontal drive system of claim 5, wherein: the first reduction gearbox comprises a first box body, a first worm and a first worm wheel, the first worm is transversely and rotatably arranged in the first box body, the first worm wheel is longitudinally and rotatably arranged in the first box body, the first worm is meshed with the first worm wheel, the first worm is concentrically and fixedly connected with the first driven shaft, and the first worm wheel is concentrically and fixedly connected with the first lead screw;

the first and second worms are arranged collinearly, and the first and second driven shafts are arranged collinearly; the first reduction gearbox and the second reduction gearbox are arranged in a back-to-back manner, and the first driven shaft and the second driven shaft are respectively connected with the first reduction gearbox and the second reduction gearbox from two sides;

the transmission ratio between the driving shaft and the first driven shaft is 1.

7. The seat horizontal drive system of claim 6, wherein: the rack is of a coating structure, and the first reduction gearbox and the second reduction gearbox are suitable for being embedded and fixed in the rack; a positioning plate is longitudinally arranged in the middle of the rack, and the first reduction gearbox and the second reduction gearbox are symmetrically arranged on two sides of the positioning plate; a first limiting hole is formed in the first reduction gearbox along the transverse direction, a second limiting hole is formed in the second reduction gearbox along the transverse direction, and a third limiting hole is formed in the rack along the transverse direction; the first limiting hole, the second limiting hole and the third limiting hole are concentrically arranged, and the linkage assembly further comprises a pin shaft which is suitable for simultaneously penetrating through the first limiting hole, the second limiting hole and the third limiting hole and limiting and fixing the first reduction gearbox and the second reduction gearbox on the rack; and two sides of the rack are provided with a cover, and the cover is suitable for covering the first one-way gear set and the second one-way gear set.

8. A seat horizontal drive assembly characterized by: comprising the seat horizontal drive system of any one of claims 1 to 7, and a power source; the power source is a double-shaft motor, and the seat horizontal driving system is provided with two groups which are respectively connected with two sides of the double-shaft motor.

9. A method of assembling the seat horizontal drive system of claim 4, comprising the steps of:

s4, assembling the first driving module assembled with the first nut module and the second driving module assembled with the second nut module with the linkage assembly, and ensuring that the first nut module and the second nut module are parallel and are flush in head and tail;