阅读说明：本技术 一种靠背骨架总成 (Backrest framework assembly ) 是由 苏军建 刘明峰 张世君 于 2020-05-22 设计创作，主要内容包括：本发明涉及一种靠背骨架总成,其包括框架、调节机构和电机,其中,框架的一侧具有电动调角器,与电动调角器连接的调节机构安装在框架的另一侧,用于驱动电动调角器的电机安装在框架上,调节机构包括下连接板、偏心传动轴、空行程转换衬套和同步杆,其中,下连接板可转动地安装在框架上,偏心传动轴可转动地安装在下连接板上,空行程转换衬套安装在偏心传动轴上,被电机驱动的同步杆插入空行程转换衬套中安装并与电动调角器连接。根据本发明的靠背骨架总成,提供调节机构来实现电动调角器的自转和公转,实现仅单边设置电动调角器即可调节靠背角度的目的。(The invention relates to a backrest framework assembly, which comprises a frame, an adjusting mechanism and a motor, wherein one side of the frame is provided with an electric angle adjuster, the adjusting mechanism connected with the electric angle adjuster is arranged on the other side of the frame, the motor used for driving the electric angle adjuster is arranged on the frame, the adjusting mechanism comprises a lower connecting plate, an eccentric transmission shaft, an idle stroke conversion bush and a synchronizing rod, the lower connecting plate is rotatably arranged on the frame, the eccentric transmission shaft is rotatably arranged on the lower connecting plate, the idle stroke conversion bush is arranged on the eccentric transmission shaft, and the synchronizing rod driven by the motor is inserted into the idle stroke conversion bush to be arranged and is connected with the electric angle adjuster. According to the backrest framework assembly, the adjusting mechanism is provided to realize rotation and revolution of the electric angle adjuster, and the purpose that the backrest angle can be adjusted only by arranging the electric angle adjuster on one side is realized.)

1. A backrest framework assembly comprises a frame, an adjusting mechanism and a motor, wherein one side of the frame is provided with an electric angle adjuster, the adjusting mechanism connected with the electric angle adjuster is arranged on the other side of the frame, and the motor used for driving the electric angle adjuster is arranged on the frame.

2. The backrest frame assembly of claim 1, wherein the rotation center of the lower connecting plate has an adjusting eccentricity with the axis of the eccentric transmission shaft, and the electromotive recliner has an adjusting eccentricity, the adjusting eccentricity being identical to the adjusting eccentricity.

3. The backrest frame assembly of claim 1, wherein the eccentric drive shaft and the lost motion conversion bushing have symmetrical free rotation angles therebetween, and the electromotive recliner has a lost motion angle equal to the lost motion angle.

4. The back frame assembly of claim 1, wherein the adjustment mechanism further comprises a rivet, and the lost motion conversion bushing is mounted to the eccentric drive shaft via the rivet.

5. The back frame assembly of claim 4, wherein the mounting shaft of the eccentric transmission shaft is inserted into the coupling hole of one side of the idle stroke conversion bushing to be coupled together by a rivet, and the synchronizing bar is inserted into the spline hole of the other side of the idle stroke conversion bushing to be mounted.

6. The back frame assembly of claim 5, wherein the mounting shaft of the eccentric drive shaft is drum-shaped in cross section, and the drive hole extending through the drum surface is a kidney hole; the connecting hole of the idle stroke conversion bush is a special-shaped hole with two diffused ends, and the conversion hole extending through the special-shaped hole is a waist hole; rivets are inserted into the drive holes and the shift holes to fix the eccentric drive shaft and the idle stroke shift bush together.

7. The back frame assembly of claim 6, wherein the round shaft of the rivet is in clearance fit with the kidney hole to allow the eccentric drive shaft and the lost motion conversion bushing to have rotational freedom, respectively.

8. The back frame assembly of claim 1, wherein the adjustment mechanism further comprises a fixing bolt and a rotating bushing, and the eccentric transmission shaft is rotatably mounted on the lower connecting plate through the fixing bolt and the rotating bushing.

9. The backrest frame assembly of claim 1, wherein the frame comprises an upper connection plate of the recliner, an upper cross-bar and an upper connection plate of the adjustment mechanism, the upper cross-bar is connected between the upper connection plate of the recliner and the upper connection plate of the adjustment mechanism, wherein the recliner is installed outside the upper connection plate of the recliner, the motor is installed inside the upper connection plate of the recliner, and the lower connection plate is installed outside the upper connection plate of the adjustment mechanism.

10. The backrest frame assembly of claim 9, wherein the power recliner upper attachment plate, the upper cross tube and the adjustment mechanism upper attachment plate are in a rigid welded relationship.

Technical Field

The present invention relates to automotive seats, and more particularly to a back frame assembly.

Background

The electric seat can improve the comfort and the technological sense of the whole vehicle, and the full electromotion of the seat becomes the development trend in the future. Most of the existing electric angle adjusters are of a differential gear planetary gear train structure, as shown in fig. 11, and have the characteristics that: the internal teeth Z1 rotate (rotate) around the center O1 of their own, and the internal teeth Z1 also rotate (revolve) around the center O2 of the external teeth Z2, and the center O1 of the internal teeth Z1 and the center O2 of the external teeth Z2 have an eccentricity a. It is the rotation plus revolution that results in a complex motion profile of the recliner 201 as shown in fig. 12, which is also the motion profile of the backrest. The complex motion track ensures that the seat backrest needs to symmetrically use two electric angle adjusters to realize consistent (synchronous) motion of two sides and ensure the normal angle adjustment of the backrest. Obviously, this also leads to a greater increase in the cost of the seat, so that the widespread use of the power seat is hindered.

Disclosure of Invention

In order to solve the problems of high cost and the like caused by the fact that eccentric angle adjusters are required to be arranged on two sides of a seat backrest in the prior art, the invention provides a backrest framework assembly.

The backrest frame assembly comprises a frame, an adjusting mechanism and a motor, wherein one side of the frame is provided with an electric angle adjuster, the adjusting mechanism connected with the electric angle adjuster is arranged on the other side of the frame, the motor used for driving the electric angle adjuster is arranged on the frame, the adjusting mechanism comprises a lower connecting plate, an eccentric transmission shaft, an idle stroke conversion bushing and a synchronizing rod, the lower connecting plate is rotatably arranged on the frame, the eccentric transmission shaft is rotatably arranged on the lower connecting plate, the idle stroke conversion bushing is arranged on the eccentric transmission shaft, and the synchronizing rod driven by the motor is inserted into the idle stroke conversion bushing to be arranged and connected with the electric angle adjuster.

Preferably, the rotation center of the lower connecting plate and the axis of the eccentric transmission shaft have an adjusting eccentricity, and the electric angle adjuster has an angle adjusting eccentricity, and the adjusting eccentricity is consistent with the adjusting eccentricity.

Preferably, there is a symmetrical free rotation angle between the eccentric drive shaft and the idle stroke conversion bushing, and the electromotive recliner has an idle stroke angle, which is equal to the idle stroke angle.

Preferably, the adjusting mechanism further comprises a rivet, and the idle stroke conversion bushing is mounted on the eccentric transmission shaft through the rivet.

Preferably, the mounting shaft of the eccentric transmission shaft is inserted into the coupling hole of one side of the idle stroke conversion bush to be coupled together by a rivet, and the synchronization rod is inserted into the spline hole of the other side of the idle stroke conversion bush to be mounted.

Preferably, the cross section of the mounting shaft of the eccentric transmission shaft is drum-shaped, and a transmission hole extending through the drum surface is a waist hole; the connecting hole of the idle stroke conversion bush is a special-shaped hole with two diffused ends, and the conversion hole extending through the special-shaped hole is a waist hole; rivets are inserted into the drive holes and the shift holes to fix the eccentric drive shaft and the idle stroke shift bush together.

Preferably, the round shaft of the rivet is clearance-fitted with the kidney hole so that the eccentric drive shaft and the idle stroke conversion bush have rotational degrees of freedom, respectively.

Preferably, the adjusting mechanism further includes a fixing bolt and a rotating bush, and the eccentric transmission shaft is rotatably mounted on the lower connecting plate through the fixing bolt and the rotating bush.

Preferably, the frame comprises an upper connecting plate of the electric angle adjuster, an upper transverse pipe and an upper connecting plate of the adjusting mechanism, the upper transverse pipe is connected between the upper connecting plate of the electric angle adjuster and the upper connecting plate of the adjusting mechanism, the electric angle adjuster is installed on the outer side of the upper connecting plate of the electric angle adjuster, the motor is installed on the inner side of the upper connecting plate of the electric angle adjuster, and the lower connecting plate is installed on the outer side of the upper connecting plate of the adjusting mechanism.

Preferably, the upper connecting plate of the electric angle adjuster, the upper transverse pipe and the upper connecting plate of the adjusting mechanism are in rigid welding relation.

According to the backrest framework assembly, the adjusting mechanism is provided for realizing rotation and revolution of the electric angle adjuster, and the purpose that the backrest angle can be adjusted only by arranging the electric angle adjuster on one side is realized, wherein the rotation of the frame side provided with the electric angle adjuster directly drives the rotation of the opposite side, and the motor and the synchronous rod of the adjusting mechanism are connected with the eccentric transmission shaft through the idle stroke conversion bushing, so that the eccentric conversion drives the revolution of the opposite side, and the two mechanisms are combined to realize the motion of the planet with small tooth difference. Therefore, the adjusting mechanism can realize the purpose that the backrest angle can be adjusted only by arranging the electric angle adjuster on one side, and has low cost and simple manufacture. Specifically, according to the adjusting mechanism of the backrest frame assembly, differential gear planetary motion of the electric angle adjuster is decomposed, and simplification of complex motion is realized. Compared with the prior art, the backrest framework assembly has the advantages of less parts, simple structure and reduced weight, and can be suitable for various seats.

Drawings

FIG. 1 is an assembled schematic view of a back frame assembly according to a preferred embodiment of the present invention;

FIG. 2 is an assembled schematic view of the frame of FIG. 1;

FIG. 3 is an assembled schematic view of the adjustment mechanism of FIG. 1;

FIG. 4 is an assembled cross-sectional schematic view of the eccentric drive shaft, rivet, lost motion conversion bushing, and synchronizing rod of FIG. 3;

FIG. 5 shows the rivet of FIG. 3 installed in the waist holes of the eccentric drive shaft and the idle stroke conversion bushing;

FIG. 6 illustrates the installed condition of the synchronizing rod of FIG. 3 inserted into the splined bore of the lost motion shift bushing;

fig. 7 shows the principle of the idle stroke phase of the backrest adjustment;

fig. 8 shows the principle of rotation of the adjustment mechanism in the backrest adjustment rotation phase;

fig. 9 shows the revolution principle of the adjustment mechanism in the backrest adjustment rotation phase;

FIG. 10 shows the eccentricity of the eccentric drive shaft of FIG. 3;

fig. 11 shows the eccentricity of the electric recliner of the differential planetary gear train structure;

fig. 12 shows the motion trajectory of the electric recliner of the differential planetary gear train structure.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, a back frame assembly 100 according to a preferred embodiment of the present invention includes a frame 200, an adjusting mechanism 300, and a motor 400, wherein one side of the frame 200 has a power recliner 201, the adjusting mechanism 300 connected to the power recliner 201 is installed at the other side of the frame 200, and the motor 400 for driving the power recliner 201 is installed at the inner side of the frame 200 by a fastener such as a bolt.

As shown in fig. 2, the frame 200 includes an upper connection plate 202 of the recliner, an upper horizontal pipe 203, an upper connection plate 204 of the adjustment mechanism, and a lower horizontal plate 205, which are connected end to end in sequence, wherein the recliner 201 is installed outside the upper connection plate 202 of the recliner, and the motor 400 is installed inside the upper connection plate 202 of the recliner (see fig. 1).

As shown in fig. 3, the adjusting mechanism 300 includes a fixing bolt 301, a lower connecting plate 302, a rotating bush 303, an eccentric transmission shaft 304, a rivet 305, an idle stroke conversion bush 306, and a synchronizing rod 307, wherein the eccentric transmission shaft 304 is rotatably mounted on the lower connecting plate 302 by the fixing bolt 301 and the rotating bush 303, the idle stroke conversion bush 306 is mounted on the eccentric transmission shaft 304 by the rivet 305, and the synchronizing rod 307 is mounted by being inserted into the idle stroke conversion bush 306. Referring to fig. 1 and 2, the lower connecting plate 302 is rotatably mounted on the outer side of the upper connecting plate 204 of the adjusting mechanism of the frame 200, the middle portion of the synchronizing bar 307 is connected to the motor 400 to drive the rotation of the synchronizing bar 307 by the motor 400, and the end of the synchronizing bar 307 remote from the lower connecting plate 302 is connected to the recliner 201.

As shown in fig. 4, the idle stroke conversion bush 306 has opposite coupling and mounting ends, wherein the mounting shaft 304a of the eccentric transmission shaft 304 is inserted into the coupling hole 306a of the coupling end to be coupled together by the rivet 305, and the free end of the synchronizing rod 307 is inserted into the splined hole 306b of the mounting end to be mounted. Specifically, the cross section of the mounting shaft 304a of the eccentric transmission shaft 304 is drum-shaped (see fig. 5), and the transmission hole 3041 is a waist hole extending through the drumhead; the connecting hole 306a of the connecting end of the idle stroke conversion bushing 306 is a special-shaped hole with two diffused ends, and the conversion hole 3061 is a waist hole extending through the special-shaped hole; a rivet 305 is inserted into the drive hole 3041 and the conversion hole 3061 to secure the eccentric drive shaft 304 and the idle stroke conversion bushing 306 together against disengagement. The round shafts 305a of the rivets 305 are received in two kidney holes, as shown in fig. 5, whereby: even if the eccentric transmission shaft 304 and the idle stroke conversion bushing 306 rotate at a certain angle, the rivet 305 can still be installed, and the installation convenience is improved; after rivet 305 is assembled, eccentric drive shaft 304 and lost motion conversion bushing 306 remain rotatable, ensuring that lost motion is eliminated. In this embodiment, the mounting end of the idle stroke conversion bushing 306 and the free end of the synchronization rod 307 have a mistake-proofing spline feature with one side flattened, so that the free end of the synchronization rod 307 is fixed in relative position without deviation when inserted into the spline hole 306b of the idle stroke conversion bushing 306, as shown in fig. 6.

The following describes the principle of the idle stroke phase of backrest adjustment with reference to fig. 7, wherein the adjustment mechanism 300 cooperates with the recliner 201 to eliminate the idle stroke before the backrest rotation starts, and the backrest does not rotate at this time. In the pre-adjustment position, the adjustment mechanism 300 is in a relatively rest position as a whole. The left and right between the eccentric transmission shaft 304 and the idle stroke conversion bushing 306 have a certain free rotation angle a degrees, which is equal to the idle stroke angle of the electromotive recliner 201 and can be adjusted according to the type of the electromotive recliner 201. In the adjusted position, the motor 400 drives the synchronizing rod 307 to rotate, one side of the synchronizing rod 307 drives the electric angle adjuster 201 to rotate by an angle a, the other side of the synchronizing rod 307 drives the idle stroke conversion bushing 306 to rotate by an angle a, the idle stroke conversion bushing 306 is meshed with the eccentric transmission shaft 304 in the rotating direction after rotating, the angle is changed from a to 0, the included angle of the other side of the idle stroke conversion bushing 306 is changed from a to 2a, and at the moment, the backrest does not rotate yet. But the entire mechanism is fully in the engaged position ready for the next backrest rotation.

The following describes the adjustment mechanism 300 rotating in accordance with the electromotive recliner 201 in the backrest adjustment rotation phase with reference to fig. 8. The motor 400 drives the synchronizing rod 307 to rotate, the synchronizing rod 307 drives the electric angle adjuster 201 to rotate, the electric angle adjuster 201 drives the upper connecting plate 202 of the electric angle adjuster to rotate, the upper connecting plate 202 of the electric angle adjuster drives the upper horizontal pipe 203 to rotate, the upper horizontal pipe 203 drives the upper connecting plate 204 of the adjusting mechanism to rotate, and then the rotation is realized indirectly. The upper connection plate 202 of the electric angle adjuster, the upper cross pipe 203 and the upper connection plate 204 of the adjusting mechanism are in rigid welding relation, so that the upper connection plate 202 of the electric angle adjuster and the upper connection plate 204 of the adjusting mechanism rotate in the same direction, namely, the rotation consistency of two sides is realized.

The following describes the revolution of the adjustment mechanism 300 in cooperation with the electromotive recliner 201 in the backrest adjustment rotation phase with reference to fig. 9. The motor 400 drives the synchronous rod 307 to rotate, the synchronous rod 307 drives the idle stroke conversion bushing 306 to rotate, the idle stroke conversion bushing 306 drives the eccentric transmission shaft 304 to rotate, and the eccentric transmission shaft 304 drives the adjusting mechanism upper connecting plate 204 to do eccentric rotation around the rotation center of the lower connecting plate 302, so that revolution is realized. As shown in fig. 10, the rotation center of the lower connecting plate 302 and the axis of the eccentric transmission shaft 304 have an adjusting eccentricity L, which is consistent with the angle adjusting eccentricity a (see fig. 11) of the electromotive recliner 201, and the rotation of the two is driven by the motor 400, and the transmission ratio is 1: 1, thus achieving the consistency of revolution.

In this way, the rotation and revolution of the adjustment mechanism 300 and the rotation and revolution of the recliner 201 are synchronized, so the movement trajectories are completely consistent, and therefore, the recliner 201 only needs to be installed on one side, and the cost is low.

The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.