WO2019205848A1 - 自动收缩汽车拖引装置 - Google Patents

自动收缩汽车拖引装置 Download PDF

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Publication number
WO2019205848A1
WO2019205848A1 PCT/CN2019/079227 CN2019079227W WO2019205848A1 WO 2019205848 A1 WO2019205848 A1 WO 2019205848A1 CN 2019079227 W CN2019079227 W CN 2019079227W WO 2019205848 A1 WO2019205848 A1 WO 2019205848A1
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WO
WIPO (PCT)
Prior art keywords
reel
traction belt
opening
coil spring
towing device
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Application number
PCT/CN2019/079227
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English (en)
French (fr)
Inventor
陈伟国
陈燕琼
邓伟
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宁波旭力金属制品有限公司
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Application filed by 宁波旭力金属制品有限公司 filed Critical 宁波旭力金属制品有限公司
Publication of WO2019205848A1 publication Critical patent/WO2019205848A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/14—Draw-gear or towing devices characterised by their type
    • B60D1/18—Tow ropes, chains or the like
    • B60D1/185—Tow ropes, chains or the like comprising a cable or chain winding device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/14—Draw-gear or towing devices characterised by their type
    • B60D1/18—Tow ropes, chains or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60D—VEHICLE CONNECTIONS
    • B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
    • B60D1/14—Draw-gear or towing devices characterised by their type
    • B60D1/18—Tow ropes, chains or the like
    • B60D1/182—Tow ropes, chains or the like comprising resilient members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/34—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables
    • B65H75/38—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material
    • B65H75/40—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material mobile or transportable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/34—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables
    • B65H75/38—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material
    • B65H75/44—Constructional details
    • B65H75/4402—Guiding arrangements to control paying-out and re-storing of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/34—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables
    • B65H75/38—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material
    • B65H75/44—Constructional details
    • B65H75/4457—Arrangements of the frame or housing
    • B65H75/4471—Housing enclosing the reel

Definitions

  • the invention relates to an automatic shrinking car towing device.
  • the general vehicle traction ropes are provided with hooks at the two ends. When used, the hooks are used to hook the tractors and the towed vehicles respectively. However, since the distance between the two vehicles cannot be stably maintained during driving, the ropes are easy to fall and mop. Moreover, the ordinary drawstring is easily entangled when carried in the vehicle, which is very messy and takes up a lot of space, causing inconvenience to the use.
  • the Chinese invention patent "Automatic Retractable Car Drawstring Device” (Application No.: CN201020273687.3) with the authorization number CN201721276U discloses a structure including a drawstring with a hook at both ends, The drawstring is wound on the rotating shaft in the casing, and the two ends of the drawstring are exposed to the casing, and the coil spring and the rotating shaft are also arranged in the casing to form an automatic rewinding mechanism.
  • the above structure utilizes a coil spring to automatically rewind the drawstring. When used, the drawstring maintains an elastic tightening state. When the distance between the two vehicles changes, the rope can be automatically elongated or contracted without falling, the traction is safer, and the vehicle is not used.
  • the rope is automatically retracted in the casing, similar to the tape measure structure, the structure is simple, the volume is compact, and the carrying space is small.
  • the automobile towing device of the above structure has been provided to the user to a large extent, but since the pulling rope is directly disposed through the rotating shaft, the rotating shaft is easily along the length of the pulling rope when the pulling rope is completely pulled out.
  • the direction moves back and forth, which not only causes the lengths of the drawstrings on both sides of the rotating shaft to be inconsistent, affecting the stability of the car towing, but also easily causes the drawstring to be easily deflected under the tightened state, which makes the drawstring difficult to smoothly pull out or shrink, affecting the use. .
  • the technical problem to be solved by the present invention is to provide a self-contracting automobile towing that can keep the reel always in the middle of the traction belt, thereby improving the stability of the vehicle towing, and pulling out or shrinking the traction belt smoothly.
  • Device
  • an automatic shrinking vehicle towing device including
  • the housing is hollow inside to form a receiving cavity, and the two sidewalls of the housing respectively have a first opening communicating with the receiving cavity;
  • a traction belt disposed through the reel and retractable in a state in which the reel is rotated, the two ends of the traction belt being respectively disposed through respective first openings in the housing;
  • the utility model is characterized in that: a limit structure capable of limiting the reel in the middle of the traction belt;
  • a second opening extending in a radial direction is formed in a side wall of the reel, a middle portion of the traction belt is provided with a third opening extending in the axial direction of the reel, and the traction belt is disposed through the second opening of the reel, and a portion of the traction belt corresponding to the third opening is located in the second opening, and a limiting block is connected to the circumferential limit of the reel through the third opening, the limiting block and the second opening, the third The openings together form the stop structure.
  • the spool can be restrained in the middle of the traction belt, and the structure is simple and compact, and the connection is easy.
  • the reel is provided at least near the end with a first limiting port that allows the limiting block to axially pass through and limits the circumferential rotation of the limiting block, and the limiting block passes through the first limiting position.
  • Port layout The limit structure is hidden in the reel, no need to add extra complicated accessories, no space, and easy assembly.
  • the reel is further provided with a positioning structure capable of preventing the stopper from moving in the axial direction of the reel.
  • the inner wall of the reel adjacent to the first end is inwardly contracted to form a first positioning step
  • the inner wall of the reel adjacent to the second end is inwardly contracted to form a second positioning step.
  • the limiting block The first end has a positioning protrusion that cooperates with the first positioning step
  • the second end of the limiting block has an elastic card that can pass through the first positioning step and cooperate with the second positioning step in a pressed state.
  • the first positioning step, the second positioning step, the positioning protrusion and the elastic card foot together constitute the positioning structure.
  • the above structure prevents the traction belt from being axially offset with respect to the reel to ensure that the leash is pulled out or contracted smoothly.
  • the housing includes a first half shell and a second half shell which are mutually contiguous, and the inner end walls of the first half shell and the second half shell are respectively provided with accommodating for receiving the corresponding coil springs. a groove, the outer peripheral wall of the coil spring is matched with the inner peripheral wall of the accommodating groove.
  • the inner peripheral wall of the accommodating groove is provided with a card slot extending in the circumferential direction.
  • the outer peripheral wall of the coil spring is provided with a card portion that can be inserted into the card slot.
  • the port of the accommodating groove is provided with a cover plate capable of preventing the coil spring from being disengaged from the accommodating groove
  • the middle portion of the coil spring has an inner hook
  • the cover plate is provided with a through hole
  • the ends of the spool are connected to the inner hooks through corresponding through holes.
  • the two ends of the reel are respectively formed with a shaft portion that can be rotatably engaged with the through hole on the corresponding cover plate, and the side wall of the shaft portion is provided with a clip extending in the axial direction and capable of clamping the inner hook of the coil spring. groove.
  • both ends of the traction belt are provided with hooks for connecting the automobile.
  • the outer peripheral wall of the reel is provided with a first reinforcing rib extending in the radial direction and a second reinforcing rib arranged in the axial direction, the first reinforcing rib being cross-connected with the second reinforcing rib to improve the reel Bearing performance.
  • a connecting belt is disposed on one side of the middle portion of the traction belt, and two ends of the connecting belt are respectively connected with the traction belt so that the middle portion of the connecting belt and the corresponding traction belt form the The third opening.
  • the invention has the advantages that the invention limits the reel to the middle of the traction belt by setting the limit structure, and the reel position does not change during the use, regardless of whether the traction belt is stretched or contracted.
  • the length of the traction belt on both sides of the reel can be kept to improve the stability of the vehicle towing; and since the position of the reel relative to the traction belt is constant, the problem of deflection during the contraction of the traction belt is avoided, so that the traction belt is pulled out or The contraction is smooth, and the stability of the vehicle towing is further improved; the limit structure of the invention is relatively simple, and the cooperation between the traction belt and the reel is compact and reliable.
  • FIG. 1 is a schematic structural view of an embodiment of the present invention
  • Figure 2 is an exploded view of Figure 1;
  • Figure 3 is a schematic structural view of the reel of Figure 2;
  • Figure 4 is a schematic structural view of the limiting block of Figure 2;
  • FIG. 5 is a schematic view showing a state of a force applied when the traction belt is completely pulled out according to an embodiment of the present invention
  • FIG. 6 is a schematic view showing a state in which a traction belt starts to be retracted according to an embodiment of the present invention
  • FIG. 7 is a schematic view showing a state of a pulling-out process of a traction belt according to an embodiment of the present invention.
  • Figure 8 is a cross-sectional view showing an embodiment of the present invention.
  • the auto-shrinking vehicle towing device of the present embodiment includes a housing 1, a coil spring 2, a reel 3, a traction belt 4, and a cover plate 5, and the interior of the housing 1 is hollow to form a receiving cavity 10, A first opening 13 communicating with the accommodating cavity 10 is respectively formed on both side walls of the housing 1.
  • the coil spring 2 is disposed in the accommodating cavity 10 of the housing 1.
  • the reel 3 is rotatably disposed in the accommodating cavity 10 of the housing 1 and can maintain the tendency of the traction belt 4 to be tightened under the driving of the coil spring 2.
  • the traction belt 4 is disposed through the reel 3 and is expandable and contractible in a state in which the reel 3 is rotated.
  • Both ends of the traction belt 4 are respectively disposed through the corresponding first openings 13 of the casing 1, and both ends of the traction belt 4 are provided for Connect the hook 7 of the car.
  • the traction belt 4 of the present embodiment is a flat webbing, and such a structure can be better and more smoothly stretched.
  • the coil spring 2 of the present embodiment and the reel 3 together constitute a tightening mechanism that can automatically contract the leash belt 4.
  • the reel 3 is always restrained in the middle of the traction belt 4 by the stopper structure.
  • the side wall of the reel 3 is opened with a second opening 31 extending in the radial direction.
  • the middle portion of the traction belt 4 is provided with a third opening 41 extending in the axial direction of the reel 3, and the traction belt 4 is disposed through the second opening 31 of the reel 3.
  • a portion of the traction belt 4 corresponding to the third opening 41 is located in the second opening 31, and a limiting block 6 is connected to the circumferential limit of the reel 3 through the third opening 41, and the limiting block 6 and the second opening 31
  • the third opening 41 together constitutes the above-mentioned limit structure.
  • a connecting belt 40 is disposed on one side of the middle portion of the traction belt 4, and both ends of the connecting belt are respectively connected with the traction belt 4 so that the third opening 41 is formed between the middle portion of the connecting belt and the corresponding traction belt.
  • the third opening 41 may be formed by overlapping the ends of the two sections of the traction belt 4, that is, the two sections of the traction belt 4 are reserved in the middle of the overlapping area without being connected.
  • the reel 3 is disposed at a position near the end with a first limiting port 32 for allowing the limiting block 6 to pass axially and restricting the limiting block 6 from rotating circumferentially.
  • the limiting block 6 is arranged through the first limiting port 32. .
  • the above-mentioned limit structure is hidden in the reel 3, without adding extra complicated accessories, and does not occupy space, and is easy to assemble.
  • the outer peripheral wall of the reel 3 of the present embodiment is provided with a first reinforcing rib 301 extending in the radial direction and a second reinforcing rib 302 axially spaced apart.
  • the first reinforcing rib 301 may also be a plurality of spaced apart, first
  • the reinforcing rib 301 is cross-connected with the second reinforcing rib 302, thereby increasing the strength of the reel 3 to withstand the torsion.
  • the reel 3 is also provided with a positioning structure capable of preventing the stopper 6 from moving in the axial direction of the reel 3.
  • a first positioning step 33 is formed on the inner wall of the reel 3 near the first end, and an inner wall adjacent to the second end of the reel 3 is inwardly contracted to form a second positioning step 34.
  • the first end of the limiting block 6 is formed.
  • the positioning protrusion 61 cooperates with the first positioning step 33, and the second end of the limiting block 6 has an elastic pin which can pass through the first positioning step 33 and cooperate with the second positioning step 34 in the pressed state. 62.
  • the first positioning step 33, the second positioning step 34, the positioning protrusion 61 and the elastic leg 62 together constitute the positioning structure.
  • the above structure prevents the traction belt 4 from being axially offset with respect to the reel 3 to ensure that the leash is pulled out or contracted smoothly.
  • the housing 1 of the present embodiment includes a first half-shell 11 and a second half-shell 12 that can be mutually aligned.
  • the first half-shell 11 and the second half-shell 12 are joined to each other by a screw 200 to form the casing 1.
  • the accommodating slots 100 for accommodating the corresponding coil springs 2 are respectively disposed on the inner end walls of the first half shells 11 and the second half shells 12, and a coil spring 2 is respectively disposed in the first half shell 11 and the second half shell 12
  • the outer peripheral wall of the coil spring 2 is matched with the inner peripheral wall of the corresponding accommodating groove 100.
  • the inner peripheral wall of the accommodating groove 100 is provided with a card slot 101 extending in the circumferential direction.
  • the outer peripheral wall of the coil spring 2 is provided with a card portion 21 that can be inserted into the card slot 101.
  • the cover plate 5 is covered at the port of the accommodating groove 100 and fixed by the screw 300, thereby preventing the coil spring 2 from being detached from the accommodating groove 100.
  • the middle portion of the coil spring 2 has an inner hook 22.
  • a central portion of the cover plate 5 is provided with a through hole 51, and an end portion of the reel 3 is connected to the inner hook 22 through a corresponding through hole 51.
  • the two ends of the reel 3 are respectively formed with a shaft portion 35 which is rotatably engaged with the through hole 51 of the corresponding cover plate 5, and the side wall of the shaft portion 35 is provided with an inner hook extending in the axial direction and capable of the coil spring 2 22 clamped slot 351.
  • the above structure can not only limit the coil spring 2 in the casing 1, but also utilize the through hole 51 in the cover plate 5 as a supporting structure for the rotation of the reel 3, thereby improving the stability of the expansion and contraction of the traction belt 4.
  • the hook 7 at one end of the traction belt 4 is hung on the tractor, and the hook 7 at the other end of the traction belt 4 is hung on the towed vehicle.
  • the two ends of the traction belt 4 are rotated by the tension of the tension spring 2 against the elastic force of the coil spring 2 to rotate the reel 3 in the opposite direction of the winding of the traction belt 4, and the two ends of the traction belt 4 are respectively from the first opening 13 of the casing 1. Pull out in the middle until the traction belt 4 is fully elongated.
  • the traction belt 4 and the hook 7 are forced to be moved by the tractor with the tractor; during the driving, if the tractor brakes, the tractor continues under inertia.
  • driving the distance between the two vehicles is reduced.
  • the traction belt 4 and the hook 7 are automatically retracted under the action of the elastic force of the coil spring 2, so that the traction belt 4 can be changed correspondingly with the distance between the two vehicles, and the traction belt is not caused by the shortening of the vehicle distance. 4 Dropped on the ground; after use is completed, the hook 7 is removed, and the traction belt 4 is retracted into the casing 1 for convenient storage.
  • the position of the reel 3 is not changed, and the traction belt 4 on both sides of the reel 3 can be kept equal, thereby improving the towing of the automobile. Stability; and because the position of the reel 3 relative to the traction belt 4 is unchanged, the problem of offset during the contraction of the traction belt 4 is avoided, so that the traction belt 4 is pulled out or contracted smoothly, further improving the stability of the vehicle towing. .

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Storing, Repeated Paying-Out, And Re-Storing Of Elongated Articles (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

一种自动收缩汽车拖引装置，包括壳体（1）、卷簧（2）、卷轴（3）及牵引带（4），壳体（1）具有容置腔（10），壳体（1）两侧壁上分别开有与容置腔（10）相连通的第一开口（13）；卷簧（2）设于壳体（1）的容置腔（10）中；卷轴（3）能转动地设于壳体（1）的容置腔（10）中并能在卷簧（2）的带动下保持沿一个方向转动的趋势；牵引带（4）穿过卷轴（3）布置并能在卷轴转动状态下伸缩，牵引带（4）的两端分别穿过壳体（1）上相应的第一开口（13）布置；还包括能将卷轴（3）限位在牵引带（4）中部的限位结构。该装置的牵引带无论拉伸还是收缩，卷轴位置均不改变，可保持卷轴两侧牵引带等长，从而提高汽车拖引的稳定性；且由于卷轴相对于牵引带位置不变，避免了牵引带收缩过程中出现偏移的问题，从而使牵引带拉出或收缩顺畅，进一步提高了汽车拖引的稳定性。

Description

自动收缩汽车拖引装置 技术领域
本发明涉及一种自动收缩汽车拖引装置。
背景技术
一般的汽车牵引拉绳都是在二端设有挂钩，使用时利用挂钩分别挂住牵引车和被牵引车，但是行驶中由于两车的距离无法稳定保持，拉绳很容易下坠拖地。而且，普通拉绳在随车携带时容易缠成一团，非常杂乱，占用空间多，给使用造成不便。
为了解决上述问题，授权公告号为CN201721276U的中国发明专利《自动卷收式汽车拉绳装置》(申请号：CN201020273687.3)披露了一种结构，其包括二端带有挂钩的拉绳，该拉绳收卷置于壳体中的转轴上，且拉绳的二端外露于壳体，壳体中还设置有卷簧和转轴配合，构成自动回卷机构。上述结构利用卷簧自动回卷拉绳，使用时拉绳保持弹性收紧状态，两车距离变化时也可自动随之拉长或收缩，不会下坠拖地，牵引更安全，而且在不使用时，拉绳可以自动卷收在壳体内，类似卷尺结构，结构简单，体积紧凑，携带占用空间少。
上述结构的汽车拖引装置已经在很大程度上为使用者提供了便利，但是，由于其牵引用拉绳直接穿过转轴布置，在拉绳完全拉出状态下，转轴容易沿拉绳的长度方向来回移动，这样不仅导致转轴两侧拉绳长度不一致，影响汽车拖引的稳定性，还容易导致拉绳在收紧状态下容易发生偏转，导致拉绳难以顺畅的拉出或收缩，影响使用。
发明内容
本发明所要解决的技术问题是针对现有技术的现状，提供一种能使卷轴始终处于牵引带的中部从而提高汽车拖引的稳定性、使牵引带拉出或收缩顺畅的自动收缩汽车拖引装置。
本发明解决上述技术问题所采用的技术方案为：一种自动收缩汽车拖引装置，包括
壳体，内部中空从而形成容置腔，所述壳体两侧壁上分别开有与容置腔相连通的第一开口；
卷簧，设于所述壳体的容置腔中；
卷轴，能转动地设于所述壳体的容置腔中并与卷簧相连接；
牵引带，穿过所述卷轴布置并能在卷轴转动状态下伸缩，所述牵引带的两端分别穿过壳体上相应的第一开口布置；
其特征在于：还包括能将卷轴限位在牵引带中部的限位结构；
所述卷轴的侧壁上开有沿径向贯穿的第二开口，所述牵引带的中部设置有沿卷轴轴向贯穿的第三开口，所述牵引带穿过卷轴的第二开口布置，且所述牵引带上对应于第三开口的部位位于第二开口中，一限位块穿过所述第三开口与卷轴周向限位连接，所述的限位块与第二开口、第三开口共同构成所述的限位结构。采用这样的结构，可将卷轴限位在牵引带中部，且结构简单、紧凑，便于连接。
作为改进，所述卷轴至少在靠近端部的位置设置有允许限位块轴向穿过而限制限位块周向转动地第一限位口，所述限位块穿过该第一限位口布置。该限位结构隐藏在卷轴中，无需增加额外的复杂配件，也不占用空间，便于装配。
再改进，所述卷轴上还设置有能防止限位块沿卷轴轴向移动的定位结构。优选地，所述卷轴上靠近第一端的内壁向内收缩形成有第一定位台阶，所述卷轴上靠近第二端的内壁向内收缩形成有第二定位台阶，对应的，所述限位块的第一端具有与第一定位台阶相配合的定位凸起，所述限位块的第二端具有能在挤压状态下穿过第一定位台阶而与第二定位台阶相配合的弹性卡脚，所述的第一定位台阶、第二定位台阶、定位凸起及弹性卡脚共同构成所述的定位结构。上述结构可防止牵引带相对于卷轴轴向偏移，以确保牵引带拉出或收缩顺畅。
为了便于装配，所述壳体包括能相互对合的第一半壳、第二半壳，该第一半壳、第二半壳的内端壁上分别设置有用于容纳相应卷簧的容置槽，所述卷簧的外周壁与容置槽的内周壁相配合限位。
为了便于装配，所述容置槽的内周壁上开设有沿周向延伸的卡槽，对应的，所述卷簧的外周壁上设置有能卡置于该卡槽中的卡部。
优选地，所述容置槽的端口处设置有能防止卷簧脱离容置槽的盖板，所述卷簧的中部具有内钩，对应的，所述盖板上开设有通孔，所述卷轴的端部穿过相应的通孔与内钩相连接。所述卷轴的两端分别形成有能与相应盖板上的通孔转动配合的轴部，且该轴部的侧壁上开设有沿轴向延伸并能将卷簧的内钩夹紧的夹槽。设置上述结构，不仅能将卷簧限位在壳体中，还能利用盖板上的通孔作为卷轴转动的支撑结构，提高牵引带伸缩的稳定性。
在上述各方案中，所述牵引带的两端均设置有用于连接汽车的挂钩。
优选地，所述卷轴的外周壁上设置有沿径向延伸的第一加强筋及沿轴向间隔布置的第二加强筋，所述第一加强筋与第二加强筋交叉连接，以提高卷轴的承力性能。
在上述各优选方案中，所述牵引带中部的一个侧面上设置有一连接带，该连接带的两端分别与牵引带相连接从而使连接带的中部与相应的牵引带之间形成所述的第三开口。
与现有技术相比，本发明的优点在于：本发明通过设置限位结构将卷轴限位在牵引 带的中部，在使用过程中，无论牵引带拉伸还是收缩，卷轴位置均不发生改变，可保持卷轴两侧牵引带等长，从而提高汽车拖引的稳定性；且由于卷轴相对于牵引带位置不变，避免了牵引带收缩过程中出现偏移的问题，从而使牵引带拉出或收缩顺畅，进一步提高了汽车拖引的稳定性；本发明的限位结构比较简单，且使牵引带与卷轴的配合紧凑、可靠。
附图说明
图1为本发明实施例的结构示意图；
图2为图1的分解图；
图3为图2中卷轴的结构示意图；
图4为图2中限位块的结构示意图；
图5为本发明实施例的牵引带完全拉出时受力状态的示意图；
图6为本发明实施例的牵引带开始收回的状态示意图；
图7为本发明实施例的牵引带拉出过程的状态示意图；
图8为本发明实施例的剖视图。
具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
如图1～8所示，本实施例的自动收缩汽车拖引装置包括壳体1、卷簧2、卷轴3、牵引带4及盖板5，壳体1内部中空从而形成容置腔10，壳体1两侧壁上分别开有与容置腔10相连通的第一开口13。卷簧2设于壳体1的容置腔10中，卷轴3能转动地设于壳体1的容置腔10中并能在卷簧2的带动下保持将牵引带4收紧的趋势，牵引带4穿过卷轴3布置并能在卷轴3转动状态下伸缩，牵引带4的两端分别穿过壳体1上相应的第一开口13布置，且牵引带4的两端均设置有用于连接汽车的挂钩7。本实施例的牵引带4为扁平状的织带，这样的结构能更好的、顺畅的伸缩。本实施例的卷簧2与卷轴3共同构成能使牵引带4自动收缩的收紧机构。
在本实施例中，卷轴3通过限位结构始终限位在牵引带4的中部。卷轴3的侧壁上开有沿径向贯穿的第二开口31，牵引带4的中部设置有沿卷轴3轴向贯穿的第三开口41，牵引带4穿过卷轴3的第二开口31布置，且牵引带4上对应于第三开口41的部位位于第二开口31中，一限位块6穿过第三开口41与卷轴3周向限位连接，限位块6与第二开口31、第三开口41共同构成上述限位结构。牵引带4中部的一个侧面上设置有一连接带40，该连接带的两端分别与牵引带4相连接从而使连接带的中部与相应的牵引带之间形成上述第三开口41。当然，上述第三开口41也可以是由两段牵引带4的端部 相互搭接形成，即两段牵引带4在搭接时均在搭接区的中部预留一段不进行连接。卷轴3在靠近端部的位置设置有允许限位块6轴向穿过而限制限位块6周向转动地第一限位口32，限位块6穿过该第一限位口32布置。上述限位结构隐藏在卷轴3中，无需增加额外的复杂配件，也不占用空间，便于装配。
本实施例卷轴3的外周壁上设置有沿径向延伸的第一加强筋301及沿轴向间隔布置的第二加强筋302，第一加强筋301也可以为间隔布置的多个，第一加强筋301与第二加强筋302交叉连接，从而提高卷轴的3的承受扭力的强度。卷轴3上还设置有能防止限位块6沿卷轴3轴向移动的定位结构。卷轴3上靠近第一端的内壁向内收缩形成有第一定位台阶33，卷轴3上靠近第二端的内壁向内收缩形成有第二定位台阶34，对应的，限位块6的第一端具有与第一定位台阶33相配合的定位凸起61，限位块6的第二端具有能在挤压状态下穿过第一定位台阶33而与第二定位台阶34相配合的弹性卡脚62，第一定位台阶33、第二定位台阶34、定位凸起61及弹性卡脚62共同构成上述定位结构。上述结构可防止牵引带4相对于卷轴3轴向偏移，以确保牵引带拉出或收缩顺畅。
本实施例的壳体1包括能相互对合的第一半壳11、第二半壳12，第一半壳11、第二半壳12相互对合并通过螺钉200连接后形成壳体1。第一半壳11、第二半壳12的内端壁上分别设置有用于容纳相应卷簧2的容置槽100，第一半壳11、第二半壳12中分别设置有一个卷簧2，卷簧2的外周壁与相应容置槽100的内周壁相配合限位。容置槽100的内周壁上开设有沿周向延伸的卡槽101，对应的，卷簧2的外周壁上设置有能卡置于该卡槽101中的卡部21。盖板5覆盖在容置槽100的端口处并通过螺钉300固定，从而防止卷簧2脱离容置槽100。卷簧2的中部具有内钩22，对应的，盖板5的中央部位开设有通孔51，卷轴3的端部穿过相应的通孔51与内钩22相连接。卷轴3的两端分别形成有能与相应盖板5上的通孔51转动配合的轴部35，且该轴部35的侧壁上开设有沿轴向延伸并能将卷簧2的内钩22夹紧的夹槽351。上述结构不仅能将卷簧2限位在壳体1中，还能利用盖板5上的通孔51作为卷轴3转动的支撑结构，提高牵引带4伸缩的稳定性。
使用本实施例的自动收缩汽车拖引装置时，将牵引带4一端的挂钩7挂置在牵引车上，将牵引带4另一端的挂钩7挂置在被牵引车上，当两车距离拉开时，牵引带4两端在拉力汽车的拉力作用下克服卷簧2的弹力使卷轴3沿牵引带4缠绕的相反方向转动，牵引带4的两端分别从壳体1的第一开口13中拉出，直至牵引带4完全拉长，此时牵引带4和挂钩7受力，被牵引车随牵引车移动；当行驶过程中，如果牵引车制动，被牵引车在惯性作用下继续行驶，两车距离缩小，此时牵引带4和挂钩7在卷簧2弹力的作用下自动收回，使得牵引带4可随两车距离大小而相应改变，不会因为车距离缩短而导致牵引带4掉落在地面；使用完成后，取下挂钩7，牵引带4收缩回壳体1内，方便储存。本实施例的自动收缩汽车拖引装置在使用过程中，无论牵引带4拉伸还是收缩，卷 轴3位置均不发生改变，可保持卷轴3两侧牵引带4等长，从而提高汽车拖引的稳定性；且由于卷轴3相对于牵引带4位置不变，避免了牵引带4收缩过程中出现偏移的问题，从而使牵引带4拉出或收缩顺畅，进一步提高了汽车拖引的稳定性。

Claims (10)

  1. 一种自动收缩汽车拖引装置，包括
    壳体(1)，内部中空从而形成容置腔(10)，所述壳体(1)两侧壁上分别开有与容置腔(10)相连通的第一开口(13)；
    卷簧(2)，设于所述壳体(1)的容置腔(10)中；
    卷轴(3)，能转动地设于所述壳体(1)的容置腔(10)中并与卷簧(2)相连接；
    牵引带(4)，穿过所述卷轴(3)布置并能在卷轴(3)转动状态下伸缩，所述牵引带(4)的两端分别穿过壳体(1)上相应的第一开口(13)布置；
    其特征在于：还包括能将卷轴(3)限位在牵引带(4)中部的限位结构；
    所述卷轴(3)的侧壁上开有沿径向贯穿的第二开口(31)，所述牵引带(4)的中部设置有沿卷轴(3)轴向贯穿的第三开口(41)，所述牵引带(4)穿过卷轴(3)的第二开口(31)布置，且所述牵引带(4)上对应于第三开口(41)的部位位于第二开口(31)中，一限位块(6)穿过所述第三开口(41)与卷轴(3)周向限位连接，所述的限位块(6)与第二开口(31)、第三开口(41)共同构成所述的限位结构。
  2. 根据权利要求1所述的自动收缩汽车拖引装置，其特征在于：所述卷轴(3)至少在靠近端部的位置设置有允许限位块(6)轴向穿过而限制限位块(6)周向转动地第一限位口(32)，所述限位块(6)穿过该第一限位口(32)布置。
  3. 根据权利要求1所述的自动收缩汽车拖引装置，其特征在于：所述卷轴(3)上还设置有能防止限位块(6)沿卷轴(3)轴向移动的定位结构。
  4. 根据权利要求3所述的自动收缩汽车拖引装置，其特征在于：所述卷轴(3)上靠近第一端的内壁向内收缩形成有第一定位台阶(33)，所述卷轴(3)上靠近第二端的内壁向内收缩形成有第二定位台阶(34)，对应的，所述限位块(6)的第一端具有与第一定位台阶(33)相配合的定位凸起(61)，所述限位块(6)的第二端具有能在挤压状态下穿过第一定位台阶(33)而与第二定位台阶(34)相配合的弹性卡脚(62)，所述的第一定位台阶(33)、第二定位台阶(34)、定位凸起(61)及弹性卡脚(62)共同构成所述的定位结构。
  5. 根据权利要求1～4中任一权利要求所述的自动收缩汽车拖引装置，其特征在于：所述壳体(1)包括能相互对合的第一半壳(11)、第二半壳(12)，该第一半壳(11)、第二半壳(12)的内端壁上分别设置有用于容纳相应卷簧(2)的容置槽(100)，所述卷簧(2)的外周壁与容置槽(100)的内周壁相配合限位。
  6. 根据权利要求5所述的自动收缩汽车拖引装置，其特征在于：所述容置槽(100)的内周壁上开设有沿周向延伸的卡槽(101)，对应的，所述卷簧(2)的外周壁上设置有能卡置于该卡槽(101)中的卡部(21)。
  7. 根据权利要求5所述的自动收缩汽车拖引装置，其特征在于：所述容置槽(100)的端口处设置有能防止卷簧(2)脱离容置槽(100)的盖板(5)，所述卷簧(2)的中部具有内钩 (22)，对应的，所述盖板(5)上开设有通孔(51)，所述卷轴(3)的端部穿过相应的通孔(51)与内钩(22)相连接。
  8. 根据权利要求7所述的自动收缩汽车拖引装置，其特征在于：所述卷轴(3)的两端分别形成有能与相应盖板(5)上的通孔(51)转动配合的轴部(35)，且该轴部(35)的侧壁上开设有沿轴向延伸并能将卷簧(2)的内钩(22)夹紧的夹槽(351)。
  9. 根据权利要求1～4中任一权利要求所述的自动收缩汽车拖引装置，其特征在于：所述牵引带(4)的两端均设置有用于连接汽车的挂钩(7)。
  10. 根据权利要求1～4中任一权利要求所述的自动收缩汽车拖引装置，其特征在于：所述牵引带(4)中部的一个侧面上设置有一连接带(40)，该连接带(40)的两端分别与牵引带(4)相连接从而使连接带(40)的中部与相应的牵引带(4)之间形成所述的第三开口(41)。
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