Wire transmission mechanism, car seat and car

Abstract

The present invention provides a wire transmission mechanism, a car seat and a car. The wire transmission mechanism of the present invention includes a brake wire wheel with a transmission shaft, two wires wound on the brake wire wheel in opposite directions, and wire tensioning units respectively arranged on both sides of the brake wire wheel, and the wire tensioning units on each side are connected to the wires on the corresponding side. The wire tensioning unit includes a tensioning wheel sleeved on the transmission shaft, and a first elastic member sleeved on the transmission shaft, the first elastic member is connected between the transmission shaft and the tensioning wheel, and has a pre-tightening force. The tensioning wheel is provided with a limiting portion abutting against the brake wire wheel, the limiting portion is used to limit the tensioning wheel to rotate relative to the brake wire wheel along a set direction, and the energy released by the first elastic member can drive the tensioning wheel to rotate relative to the transmission shaft along the set direction to tension the wire. The wire transmission mechanism of the present invention can achieve the effect of automatically tightening the wire, and effectively avoid the movement lag phenomenon caused by the relaxation of the wire.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a cable transmission mechanism. The present invention also relates to a car seat having the cable transmission mechanism. Simultaneously, the present invention also relates to a car equipped with the car seat. Background Art

[0002] In applications where brake cables are used, such as in power seats in cars, some current power seats use brake cables as a power transmission component. Under the rotation of the motor, the cable pulls the seat along the slide rails. However, in existing power seats using brake cables, the cable ends are typically directly connected to the seat frame without a pre-tensioning mechanism. While this connection is structurally simple, the cable cannot be pre-tensioned, resulting in cable slack after assembly, with the actual length exceeding the theoretical value. In these cases, the cable must be tightened before the seat can be pulled, resulting in adjustment lag.

[0003] Therefore, to tighten the brake cable, existing brake cable mechanisms require an additional cable tolerance absorption mechanism, which takes up a lot of space, is costly, and has a complex structure. Furthermore, as the cable lengthens over time, the idle travel becomes excessive, making it impossible to tighten the cable during use. Summary of the Invention

[0004] In view of this, the present invention aims to provide a wire transmission mechanism that can absorb the stretched wire length and achieve automatic tensioning.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A cable transmission mechanism comprises a brake wire wheel having a transmission shaft, two cables wound around the brake wire wheel in opposite directions, and cable tensioning units respectively provided on both sides of the brake wire wheel, wherein the cable tensioning unit on each side is connected to the cable on the corresponding side;

[0007] Wherein, the wire tensioning unit includes a tensioning wheel sleeved on the transmission shaft, and a first elastic member sleeved on the transmission shaft, the first elastic member is connected between the transmission shaft and the tensioning wheel and has a pre-tightening force;

[0008] The tensioning wheel is provided with a limiting portion abutting against the gate wire wheel, and the limiting portion is used to limit the tensioning wheel to rotate relative to the gate wire wheel along a set direction. The energy released by the first elastic member can drive the tensioning wheel to rotate relative to the transmission shaft along the set direction to tension the pull wire.

[0009] Furthermore, the brake wire wheel has a groove arranged around the transmission shaft, and the tensioning wheel includes a tensioning portion embedded in the groove;

[0010] The limiting portion includes a sliding member slidably provided on the tensioning portion along the circumferential direction of the tensioning portion, and a second elastic member abutting between the sliding member and the tensioning portion, and the limiting portion abuts against the brake wire wheel through the sliding member.

[0011] Furthermore, the sliding member includes a rod body slidably inserted on the tensioning portion, and a ball disposed at one end of the rod body;

[0012] The second elastic member includes a spring sleeved on the rod.

[0013] Furthermore, the tensioning portion adopts a ratchet and has a plurality of ratchet teeth arranged at intervals along the circumferential direction, and each of the ratchet teeth is provided with the limiting portion.

[0014] Furthermore, the tensioning wheel includes a connecting portion that is plug-connected to the tensioning portion, and the pull wire is connected to the connecting portion;

[0015] The first elastic member includes a torsion spring connected between the transmission shaft and the connecting portion, and the torsion spring is embedded in the connecting portion.

[0016] Furthermore, a spline hole is provided on the transmission shaft, and the transmission shaft can be connected to the external driving part through a connecting rod inserted into the spline hole.

[0017] Furthermore, the wire transmission mechanism includes a first shell and a second shell that are fastened together to form a receiving cavity;

[0018] The brake wire wheel and the cable tensioning unit are arranged in the accommodating cavity, and one end of the cable extends out of the accommodating cavity.

[0019] Furthermore, the transmission shaft is threadedly connected to a fixedly arranged threaded member, and the transmission shaft can be rotated to move relative to the threaded member along the axial direction of the transmission shaft.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The wire transmission mechanism described in the present invention is provided with a wire tensioning unit on both sides of the brake wire wheel. When the brake wire wheel and the wire are relaxed, the tensioning wheel rotates by releasing energy through the rebound of the first elastic member, and the wire is tightened in the tensioning direction by providing a limiting part. This not only compensates for the slack of the wire, but also effectively prevents the wire from becoming loose during the tensioning process, thereby realizing automatic tensioning.

[0022] Furthermore, the present invention provides a groove on the brake pulley to accommodate the limiting portion and the tensioning portion, enabling them to abut against the brake pulley. The second elastic member, through the action of which the first elastic member is forced to rebound, achieves the purpose of automatically tensioning the tensioning pulley. The rod and ball bearing, along with a spring sleeved on the rod, prevent the tensioning pulley from rotating in a loosening direction. This structural arrangement is simple and easy to implement. Circumferentially spaced ratchets allow the multiple limiting portions to form a one-way lock on the tensioning portion, thereby evenly applying circumferential force to the tensioning portion and improving the stability of the tensioning mechanism.

[0023] Furthermore, by configuring the first elastic member as a torsion spring and positioning the torsion spring within the connection portion of the tensioning pulley, the torsion spring's rebound force drives the tensioning pulley to tighten, achieving infinite adjustment and more precise cable control. Furthermore, by threading the transmission shaft into a fixed threaded member, the transmission shaft moves axially during rotation, maintaining a constant angle at which the cable enters the tensioning pulley. This prevents abnormal noise caused by friction between the cable and the sleeve, improving transmission efficiency.

[0024] Another object of the present invention is to provide a car seat, on which the above-mentioned wire transmission mechanism is provided.

[0025] The car seat of the present invention, by providing the above-mentioned cable transmission mechanism, can automatically tighten the cable after it is relaxed, thereby effectively ensuring that no movement lag occurs during the movement of the car seat.

[0026] At the same time, the present invention also provides a car, which is provided with the car seat as described above.

[0027] The car of the present invention has the same beneficial effects as the car seat described above relative to the prior art, and details thereof will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 A schematic structural diagram of a wire transmission mechanism according to an embodiment of the present invention from a first perspective;

[0030] Figure 2 Schematic diagram of an explosion of the wire transmission mechanism according to an embodiment of the present invention;

[0031] Figure 3 This is a structural schematic diagram of the wire transmission mechanism according to an embodiment of the present invention without the second housing from a first perspective;

[0032] Figure 4This is a structural schematic diagram of the wire transmission mechanism according to an embodiment of the present invention, excluding the second housing, from a second perspective;

[0033] Figure 5 This is a schematic structural diagram of the wire transmission mechanism according to an embodiment of the present invention, excluding the first housing, the second housing, and the screw member;

[0034] Figure 6 A schematic diagram of the installation structure of the tensioning wheel, the transmission shaft, and the cable from a first perspective according to an embodiment of the present invention;

[0035] Figure 7 A schematic diagram of the installation structure of the tensioning wheel, the transmission shaft, and the cable according to an embodiment of the present invention from a second perspective;

[0036] Figure 8 This is a schematic diagram of the installation structure of the transmission shaft and the connecting part according to an embodiment of the present invention from a first perspective;

[0037] Figure 9 This is a schematic diagram of the installation structure of the transmission shaft, the tensioning portion, and the limiting portion according to an embodiment of the present invention;

[0038] Figure 10 For the present invention Figure 9 A top view of

[0039] Figure 11 Schematic diagram of the installation structure of the ratchet, limiting portion and connecting portion according to an embodiment of the present invention;

[0040] Figure 12 This is a schematic diagram of the installation structure of the transmission shaft and the connecting part according to an embodiment of the present invention from a second perspective;

[0041] Figure 13 This is a schematic structural diagram of a brake wire wheel according to an embodiment of the present invention;

[0042] Figure 14 Schematic diagram of the structure of the connecting part according to an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1. Brake cable pulley; 2. Pull cable; 3. Tensioning pulley; 4. Limiting portion; 5. First housing; 6. Second housing; 7. Threaded member; 8. Sleeve;

[0045] 101. Drive shaft; 102. Groove; 103. Frame; 104. Wheel;

[0046] 301. Tensioning portion; 302. Connecting portion; 303. First elastic member;

[0047] 401, rod body, 402, ball bearing; 403, spring;

[0048] 1011, spline hole; 1012, boss;

[0049] 1041. Guide groove; 1042. Wire drawing groove;

[0050] 3011, Ratchet;

[0051] 3021. Fixed end; 3022. Lead groove; 3023. Connecting column; 3024. Accommodating groove; 3025. Limiting groove; 3026. Weight reduction hole. DETAILED DESCRIPTION

[0052] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0053] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," and "back" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] Furthermore, in the description of the present invention, unless otherwise expressly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will appreciate the specific meanings of these terms in the present invention based on the specific circumstances.

[0055] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0056] This embodiment relates to a cable transmission mechanism for pre-tightening the cable 2 to prevent slack between the cable 2 and the brake reel 1. Overall, the cable transmission mechanism comprises a brake reel 1 having a transmission shaft 101, two cables 2 wound around the brake reel 1 in opposite directions, and cable tensioning units provided on both sides of the brake reel 1, with each cable tensioning unit connected to the cable 2 on the corresponding side.

[0057] The cable tensioning unit includes a tensioning wheel 3 mounted on the transmission shaft 101, and a first elastic member 303 mounted on the transmission shaft 101. The first elastic member 303 is connected between the transmission shaft 101 and the tensioning wheel 3 and has a preload force. The tensioning wheel 3 is provided with a limiting portion 4 that abuts the brake wire wheel 1. The limiting portion 4 is used to limit the rotation of the tensioning wheel 3 relative to the brake wire wheel 1 in a set direction. The first elastic member 303 releases energy to drive the tensioning wheel 3 to rotate in the set direction relative to the transmission shaft 101 to tension the cable 2.

[0058] The cable transmission mechanism of this embodiment has cable tensioning units on both sides of the brake reel 1, capable of tensioning the corresponding cable 2. The first elastic member 303 and the tensioning pulley 3 release the pre-tensioning force when the cable 2 slackens, compensating for the slack between the cable 2 and the brake reel 1, thereby tightening the cable 2. Furthermore, the limiting portion 4 ensures that the tensioning pulley 3 always rotates in the direction of tensioning the cable 2, thus achieving automatic tensioning.

[0059] Based on the above overall introduction, an exemplary structure of the wire transmission mechanism of this embodiment includes a brake wire reel 1 having a transmission shaft 101 and a wire tensioning unit provided on both sides of the brake wire reel 1. The set direction described in this embodiment is the locking direction of the wires described below. By providing the wire tensioning unit, two wires 2 wound in opposite directions are automatically locked. This structure is compact, occupies little space, and is easy to implement.

[0060] In addition, the cable transmission mechanism further includes a first shell 5 and a second shell 6 that are buckled together to form an accommodating cavity. The brake wire wheel 1 and the cable tensioning unit are arranged in the accommodating cavity, and one end of the cable 2 extends out of the accommodating cavity.

[0061] like Figure 1 and Figure 2 As shown in , the wire-drawing transmission mechanism of this embodiment is arranged in the accommodating chamber, and the first shell 5 and the second shell 6 serve to enclose the wire-drawing transmission mechanism to ensure its smooth movement. The first shell 5 of this embodiment is the outer shell of the transmission machine, and the second shell 6 is the inner shell of the transmission machine. The wires 2 on both sides of the brake wire wheel 1 are wound around the brake wire wheel 1 in opposite directions, so that when the brake wire wheel 1 rotates, one wire 2 is tightened and the other wire 2 is stretched. The wires 2 on both sides extend out of the outer shell of the transmission machine and the outer side of the inner shell of the transmission machine.

[0062] It should be noted that the pull wire 2 mentioned in this embodiment is generally made of steel wire. Of course, in addition to steel wire, other flexible members such as nylon rope or belt can also be used. In addition, the tensioning wheel 3, the first elastic member 303, and the brake pulley 1 of this embodiment are preferably made of plastic, or conventional aluminum alloy, cast aluminum, cast steel, etc. can also be used. Adaptive adjustment can be made according to the specific application state, and there is no limitation on this.

[0063] like Figure 2 As shown, the brake reel 1 of this embodiment includes a transmission shaft 101 and a wheel disc 104. As a feasible embodiment, the transmission shaft 101 of this embodiment has an integrally formed frame 103 connected to the wheel disc 104. To improve transmission strength, the frame 103 and the transmission shaft 101 are made of steel. The wheel disc 104 is specifically made of plastic, but can also be made of aluminum or steel as described above. The wheel disc 104 is fixedly connected to the frame 103, and can be fixed by riveting or injection molding.

[0064] like Figure 13 As shown, to prevent the cable 2 from escaping, a cable groove 1042 is provided on the outer circumference of the wheel 104, arranged in an axial spiral. Since the brake wire reel 1 has two cables 2 wound in opposite directions, the cable grooves 1042 are also symmetrically arranged on both sides. Guide grooves 1041 are provided on both end surfaces of the wheel 104 to guide the cable 2 into.

[0065] In addition, as a preferred embodiment, a spline hole 1011 is provided on the transmission shaft 101, and the transmission shaft 101 can be connected to the external driving part through a connecting rod inserted into the spline hole 1011. Figure 3 As shown, a spline hole 1011 is provided along the circumference of the transmission shaft 101, and the spline hole 1011 is clamped by a splined connecting rod adapted to the spline hole 1011. The external drive unit of this embodiment is a drive motor, and the connecting rod is fixedly connected to the power output end of the drive motor to drive the connecting rod and the transmission shaft 101 to rotate, thereby driving the brake wire wheel 1 to rotate.

[0066] As a specific embodiment, the brake wire pulley 1 of this embodiment has a groove 102 arranged around the transmission shaft 101, and the tensioning pulley 3 includes a tensioning portion 301 embedded in the groove 102. The limiting portion 4 includes a sliding member sliding on the tensioning portion 301 along the circumference of the tensioning portion 301, and a second elastic member abutting between the sliding member and the tensioning portion 301. The limiting portion 4 abuts against the brake wire pulley 1 through the sliding member.

[0067] Specifically, if Figures 4 to 6 As shown, the brake reel 1 of this embodiment has grooves 102 on both sides for accommodating the tensioning portions 301. The grooves 102 are formed on the aforementioned frame 103. That is, two grooves 102 are provided along the axial direction of the transmission shaft 101 and open toward the outer end of the frame 103. The tensioning portions 301 are provided in the grooves 102 on both sides to compensate for the elongation of the tensioning cables 2 on both sides of the brake reel 1 after relaxation.

[0068] In addition, the limiting portion 4 of this embodiment is provided with a sliding member. When the tensioning portion 301 rotates relative to the tensioning direction of the brake pulley 1, the second elastic member is compressed by the sliding member, allowing the tensioning portion 301 to rotate along the inner wall of the groove 102 and be tensioned. When the tensioning portion 301 rotates in the direction of loosening the tensioning pulley 3, the sliding member is pressed by the tensioning portion 301 and cannot rotate, thereby achieving unidirectional movement of the tensioning portion 301.

[0069] For ease of implementation, the sliding member of this embodiment includes a rod body 401 slidably inserted on the tensioning portion 301, and a ball 402 provided at one end of the rod body 401. The second elastic member includes a spring 403 sleeved on the rod body 401. Specifically, Figure 9 and Figure 10 As shown, in this embodiment, a rod 401 is provided on the tensioning portion 301 , a spring 403 is sleeved on the rod 401 , and a ball 402 is provided at one end of the rod 401 to abut against the inner wall of the groove 102 .

[0070] When the tensioning portion 301 compresses the spring 403 so that the ball 402 abuts against the inner wall of the groove 102, the tensioning portion 301 can rotate in the tensioning direction of the tensioning wheel 3. When the tensioning portion 301 rotates in the opposite direction, the spring 403 stretches, and the tensioning portion 301 presses against the ball 402, preventing the tensioning portion 301 from rotating in the opposite direction, thereby preventing the tensioning wire 2 from relaxing in the opposite direction during the tensioning process.

[0071] In addition, the tensioning portion 301 of this embodiment adopts a ratchet and has a plurality of ratchet teeth 3011 spaced apart along the circumference, and each ratchet tooth 3011 is provided with a limiting portion 4. As a specific embodiment, Figures 9 to 11 As shown, the tensioning portion 301 adopts a ratchet structure, that is, the ratchet teeth 3011 of the ratchet and the inner wall of the groove 102 form a cavity similar to a triangle.

[0072] Combine Figure 9 and Figure 12 As shown, the tensioning portion 301 of this embodiment is a ratchet wheel having the aforementioned ratchet teeth 3011. As a preferred embodiment, the ratchet wheel of this embodiment has six ratchet teeth 3011 distributed circumferentially, and each ratchet tooth 3011 is provided with a corresponding limiting portion 4. This arrangement ensures that the force exerted by the limiting portion 4 on the ratchet wheel is more uniform, achieving better performance. Of course, it is also feasible to provide the ratchet wheel with only one ratchet tooth 3011 and the corresponding limiting portion 4.

[0073] like Figure 10As shown, the inner wall of the groove 102 can be regarded as the hypotenuse of the triangular cavity, and one of the right-angled sides of the ratchet 3011 is slidably connected to the rod 401. The rod 401 is provided with a spring 403, and one end of the spring 403 is fixedly connected to the ball 402, and the other end abuts the right-angled side of the ratchet 3011. The ball 402 is fixed to the rod 401 and is disposed in the triangular cavity.

[0074] As mentioned above, based on the setting direction Figure 10 As shown in the state shown in FIG. , the tensioning portion 301 of this embodiment rotates in the direction in which the cable is tightened. Specifically, when the tensioning portion 301 rotates counterclockwise along the arrow shown, the ball 402 is squeezed by the hypotenuse of the triangular cavity, causing the ball 402 to move along the guide direction of the rod body 401 toward the right-angled side of the ratchet 3011. At this time, the spring 403 is compressed, allowing the tensioning portion 301 to rotate.

[0075] Still Figure 10 As shown in the state shown in FIG, when the tensioning portion 301 rotates clockwise, the other right-angled side of the ratchet 3011 applies a squeezing force to the ball 402. The direction of this squeezing force is set at an angle to the compression direction of the spring 403. At this time, the spring 403 is released because it is no longer squeezed, and the spring 403 generates a rebound force on the ball 402, causing it to move toward the inner wall of the groove 102. As a result, the squeezing force of the tensioning portion 301 and the rebound force of the spring 403 on the ball 402 cause it to be squeezed in the position shown in the figure, preventing it from rotating clockwise, thereby achieving the purpose of the tensioning wheel 3 only rotating counterclockwise.

[0076] Furthermore, as a feasible implementation, the tensioning wheel 3 of this embodiment includes a connecting portion 302 that is plug-connected to the tensioning portion 301, and the pull wire 2 is connected to the connecting portion 302. The first elastic member 303 includes a torsion spring connected between the transmission shaft 101 and the connecting portion 302, and the torsion spring is embedded in the connecting portion 302.

[0077] Specifically, combined Figure 2 、 Figure 10 and Figure 11 As shown, the connecting portion 302 of this embodiment is disposed outside the tensioning portion 301 and abuts against the aforementioned frame 103 of the transmission shaft 101. The connecting portion 302 utilizes a disc structure, wherein the connecting portion 302 includes a fixed end 3021 for securing the cable 2. The fixed end 3021 of the cable 2 is formed as a circular through-hole extending through the connecting portion 302 and is wound around the wheel 104 through the aforementioned guide groove 1041. Furthermore, to facilitate the entry of the cable 2, a wire guide groove 3022 extends circumferentially from the connecting portion 302 toward the fixed end 3021, communicating with the guide groove 1041.

[0078] like Figure 14As shown in FIG. 1 , as a specific embodiment, the connecting portion 302 of this embodiment has a protruding connecting post 3023 at one end facing the tensioning portion 301, and the ratchet has a through-hole for the connecting post 3023 to pass through. As a feasible embodiment, the connecting post 3023 and the through-hole are connected and fixed by a transition fit or interference fit. Of course, other methods such as welding or riveting can also be used for fixing, or in other embodiments, the connecting portion 302 and the tensioning portion 301 can be designed as a single part.

[0079] In addition, since the pull wires 2 have two opposite directions, two opposite tension wheels 3 are provided on both sides of the transmission shaft 101, such as Figure 6 and Figure 7 As shown, the direction of winding from the fixed end 3021 located on the connecting portion 302 of the two tensioning wheels 3 to the wheel disc 104 is adapted to the tensioning direction of the corresponding tension wire 2.

[0080] like Figure 8 As shown, a receiving space 3027 for a torsion spring is provided at the center of the connecting portion 302. To facilitate placement of the torsion spring and provide preload, a rectangular boss 1012 is formed on the transmission shaft 101 to prevent the torsion spring from rotating. One end of the torsion spring is coiled and engaged with the boss 1012. Furthermore, a retaining groove 3025 is provided on the connecting portion 302 to prevent the torsion spring from rotating. The other end of the torsion spring is engaged with the retaining groove 3025, thereby providing preload for the torsion spring.

[0081] And, as Figure 14 As shown, in order to prevent the torsion spring from making up for the slack of the pull wire 2 due to excessive elastic release capacity, thereby causing the pull wire 2 to be suddenly tightened, this embodiment provides a receiving groove 3024 on the outer circumference of the connecting portion 302 to accommodate the pull wire 2. The receiving groove 3024 is connected between the above-mentioned lead groove 3022 and the guide groove 1041, so that the pull wire 2 is fixed to the fixed end 3021 after being wound around the connecting portion 302. When the tensioning wheel 3 rotates due to the rebound of the torsion spring, the pull wire 2 is gradually tightened to improve the stability of the pull wire transmission mechanism.

[0082] Furthermore, as a preferred embodiment, in order to reduce the weight of the tensioning wheel 3 and facilitate rotation, the connecting portion 302 of this embodiment is provided with weight-reducing holes 3026 arranged at circumferential intervals, such as Figure 14 As shown, the weight-reducing holes 3026 are formed as elongated holes. Of course, they can also be circular, elliptical, square, or other special shapes. In this embodiment, six weight-reducing holes 3026 are evenly distributed and located on the side of the connecting column 3023 near the outer periphery. In this embodiment, there is no limit to the number of weight-reducing holes 3026; they can be adjusted to accommodate changes in material and size while ensuring strength.

[0083] The wire transmission mechanism of this embodiment is achieved by arranging a torsion spring on the connecting part 302 of the pre-tensioning wheel, and the pre-tensioning wheel has a fixed end 3021 for winding the wire 2. When the brake wire wheel 1 and the wire 2 become loose, the energy release of the torsion spring can cause the connecting part 302 of the tensioning wheel 3 to rotate in the direction of tightening the wire 2, thereby achieving the effect of automatically tightening the wire 2.

[0084] Furthermore, since this embodiment uses a torsion spring as the driving force, the torsion spring can be replaced to adjust the contraction force according to design requirements. This mechanism has a simple structure and good adaptability. Furthermore, to prevent the torsion spring from falling out, the end of the torsion spring wrapped around the transmission shaft 101 or the end of the torsion spring engaged with the retaining groove 3025 can be fixed with a bolt. Of course, the torsion spring can also be prevented from falling out by axially compressing the first and second housings 5 ​​and 6.

[0085] like Figure 9 and Figure 12 As shown, since the tensioning directions of the cable 2 on both sides of the brake reel 1 are opposite, the tightening direction of the ratchet wheel 102 is also arranged in the opposite direction of its corresponding rotation. When the connecting portion 302 is driven to rotate by the torsion spring, the tensioning portion 301 fixed to the connecting portion 302 can prevent the torsion spring from releasing energy in the direction of the cable 2 loosening, thereby effectively ensuring the tensioning effect of the cable 2 and preventing movement delay caused by the relaxation of the brake reel 1 and the cable 2.

[0086] As mentioned above, this embodiment adopts the ratchet and the limiting part 4 as the mechanism for the contraction movement of the cable 2, realizing stepless adjustment, being able to lock the tensioning wheel 3 at any time, and improving the performance of the cable transmission mechanism.

[0087] In addition, as a preferred embodiment, in order to prevent the wire 2 from rubbing against the sleeve 8 during rotation, the transmission shaft 101 of this embodiment is screwed to the fixed screw member 7, and the transmission shaft 101 can be rotated to move along the axial direction of the transmission shaft 101 relative to the screw member 7. Specifically, Figure 4 As shown, two sleeves 8 are provided between the first shell 5 and the second shell 6 for the pull wires 2 on both sides to pass through.

[0088] In order to achieve the above-mentioned purpose, the transmission shaft 101 of this embodiment is provided with a threaded screw member 7 at one end close to the first housing 5. The screw member 7 is fixed to the first housing 5. When the transmission shaft 101 is driven to rotate, the relative positions of the pull wires 2 on both sides of the gate wire wheel 1 on the gate wire wheel 1 change. At this time, the transmission shaft 101 can move axially along the transmission shaft 101 through the transmission with the screw member 7. Moreover, the pitch of the screw member 7 is the same as the line pitch of the two adjacent pull wires 2 wound in a spiral. In this way, it can be ensured that the positions of the pull wires 2 on both sides relative to the sleeve 8 remain unchanged during the driving process of the transmission shaft 101, thereby avoiding abnormal noise during operation and increasing the loss of driving ability.

[0089] The cable transmission mechanism of this embodiment arranges tensioning wheels 3 with pre-tensioning force on both sides of the brake wire wheel 1. When the brake wire wheel 1 and the cable 2 become slack, the first elastic member 303 on the corresponding side releases energy to drive the tensioning wheel 3 to rotate, thereby achieving the effect of automatically tightening the cable 2. At the same time, the limiting portion 4 is provided to unidirectionally restrict the tensioning portion 301, so that the tensioning wheel 3 can only rotate in the tightening direction, thereby improving the tightening effect of the cable 2 and effectively avoiding the motion hysteresis caused by the relaxation of the cable 2.

[0090] In addition, this embodiment also relates to a car seat, the upper slide rail of which is provided with the above-mentioned wire transmission mechanism, and the number of the wire transmission mechanisms is two and is arranged opposite to each other.

[0091] In terms of specific structure, as a feasible implementation method, the car seat of this embodiment includes two sliding rail mechanisms arranged side by side on both sides, and the two sliding rail mechanisms include two relatively arranged lower sliding rails and upper sliding rails arranged on the lower sliding rails, one of the lower sliding rails is provided with two upper sliding rails, and the two upper sliding rails are correspondingly connected through the above-mentioned wire transmission mechanism.

[0092] Furthermore, the two cable transmission mechanisms are connected by the aforementioned connecting rod, which is in transmission connection with the power output end of the external drive unit. The cable transmission mechanisms on both sides are driven by the external drive unit via the connecting rod, thereby achieving synchronous actuation of the cable transmission mechanisms on both sides. The arrangement structure of the cable transmission mechanism can be referenced to the prior art multi-row track electric seat slide structure and will not be further described here.

[0093] The car seat of this embodiment is provided with two relatively arranged wire transmission mechanisms to achieve multi-slide electric position adjustment of the car seat, which has good practicality.

[0094] In addition, this embodiment also relates to a car, which is provided with the car seat as described above.

[0095] The car of this embodiment can realize electric adjustment of the car seat by applying the car seat as described above, effectively avoiding movement lag of the seat adjustment, and has a better use effect.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wire transmission mechanism, characterized in that: It comprises a brake wire wheel (1) having a transmission shaft (101), two pull wires (2) wound around the brake wire wheel (1) in opposite directions, and pull wire tensioning units respectively provided on both sides of the brake wire wheel (1), wherein the pull wire tensioning unit on each side is connected to the pull wire (2) on the corresponding side; The wire tensioning unit comprises a tensioning wheel (3) sleeved on the transmission shaft (101), and a first elastic member (303) sleeved on the transmission shaft (101), wherein the first elastic member (303) is connected between the transmission shaft (101) and the tensioning wheel (3) and has a pre-tightening force; The tensioning wheel (3) is provided with a limiting portion (4) that abuts against the brake wire wheel (1), and the limiting portion (4) is used to limit the rotation of the tensioning wheel (3) relative to the brake wire wheel (1) along a set direction. The first elastic member (303) releases energy to drive the tensioning wheel (3) to rotate relative to the transmission shaft (101) along the set direction to tension the tensioning wire (2).

2. The wire-drawing transmission mechanism according to claim 1, wherein: The brake wire wheel (1) has a groove (102) arranged around the transmission shaft (101), and the tensioning wheel (3) includes a tensioning portion (301) embedded in the groove (102); The limiting portion (4) comprises a sliding member provided on the tensioning portion (301) and slidingly arranged along the circumference of the tensioning portion (301), and a second elastic member abutting between the sliding member and the tensioning portion (301), and the limiting portion (4) abuts against the brake wire wheel (1) through the sliding member.

3. The wire-drawing transmission mechanism according to claim 2, wherein: The sliding member comprises a rod (401) slidably inserted on the tensioning portion (301), and a ball (402) provided at one end of the rod (401); The second elastic member comprises a spring (403) sleeved on the rod body (401).

4. The wire-drawing transmission mechanism according to claim 2, wherein: The tensioning portion (301) is a ratchet and has a plurality of ratchet teeth (3011) arranged at intervals along the circumferential direction, and each of the ratchet teeth (3011) is provided with the limiting portion (4).

5. The wire-drawing transmission mechanism according to claim 2, wherein: The tensioning wheel (3) comprises a connecting portion (302) plug-connected to the tensioning portion (301), and the pull wire (2) is connected to the connecting portion (302); The first elastic member (303) comprises a torsion spring connected between the transmission shaft (101) and the connecting portion (302), and the torsion spring is embedded in the connecting portion (302).

6. The wire-drawing transmission mechanism according to claim 1, wherein: A spline hole (1011) is provided on the transmission shaft (101), and the transmission shaft (101) can be connected to an external driving part through a connecting rod inserted into the spline hole (1011).

7. The wire-drawing transmission mechanism according to claim 1, wherein: The wire-drawing transmission mechanism comprises a first shell (5) and a second shell (6) that are fastened together to form a receiving cavity. The brake wire wheel (1) and the cable tensioning unit are arranged in the accommodating cavity, and one end of the cable (2) extends out of the accommodating cavity.

8. The wire-drawing transmission mechanism according to any one of claims 1 to 7, characterized in that: The transmission shaft (101) is threadedly connected to a fixedly arranged threaded member (7), and the transmission shaft (101) is capable of rotating relative to the threaded member (7) and moving along the axial direction of the transmission shaft (101).

9. A car seat, characterized in that: The upper slide rail of the car seat is provided with the wire transmission mechanism according to any one of claims 1 to 8, and the wire transmission mechanisms are two arranged opposite to each other.

10. An automobile, characterized in that: The car is provided with the car seat according to claim 9.

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