阅读说明：本技术 导向轮装置及拖挂式房车 (Leading wheel device and pull-type car as a house ) 是由 白铁刚 郭林林 张春雨 刘全有 于 2021-02-09 设计创作，主要内容包括：本申请公开了一种导向轮装置及拖挂式房车,包括有导向轮、用于控制所述导向轮升降的伸缩装置和用于收放所述导向轮的收放装置,所述收放装置包括有用于与拖挂式房车相连接的固定件和用于锁紧所述导向轮的第一锁紧装置,所述伸缩装置与所述固定件可转动地连接,所述导向轮安装在所述伸缩装置的伸缩端,所述第一锁紧装置与所述伸缩装置相连接,且所述第一锁紧装置能够与所述固定件相锁紧。如此设置,解决了现有的拖挂式房车没有导向轮而进行位置调整时费时费力的问题。(The application discloses leading wheel device and pull-type car as a house, including the leading wheel, be used for control the telescoping device that the leading wheel goes up and down with be used for receiving and releasing the winding and unwinding devices of leading wheel, winding and unwinding devices is including being used for the mounting that is connected with the pull-type car as a house and being used for locking the first locking device of leading wheel, the telescoping device with the mounting is rotationally connected, the leading wheel is installed the flexible end of telescoping device, first locking device with the telescoping device is connected, just first locking device can with the mounting locks mutually. So set up, solved current pull-type car as a house and do not have the leading wheel and waste time and energy's problem when carrying out position adjustment.)

1. The utility model provides a leading wheel device, its characterized in that, including leading wheel (19), be used for control the telescoping device that leading wheel (19) go up and down with be used for receiving and releasing the winding and unwinding devices of leading wheel (19), winding and unwinding devices is including being used for the mounting that is connected with the pull-type car as a house and being used for locking the first locking device of leading wheel (19), the telescoping device with the mounting is rotationally connected, leading wheel (19) are installed the flexible end of telescoping device, first locking device with the telescoping device is connected, just first locking device can with the mounting locks mutually.

2. The guide wheel device according to claim 1, characterized in that the telescopic device comprises a fixed component rotatably connected with the fixed component and a lifting component for controlling the lifting of the guide wheel (19), the lifting component comprises a lead screw nut pair arranged in the fixed component and an internal connecting rod (5) connected with the guide wheel (19), a lead screw (14) of the lead screw nut pair is rotatably connected with the fixed component, and the internal connecting rod (5) is fixedly connected with a nut (15) of the lead screw nut pair.

3. The guide wheel device according to claim 2, wherein the fixing component comprises a middle connecting rod (4), a connecting component sleeved outside the middle connecting rod (4), and a second locking device for locking the connecting component and the middle connecting rod (4), a lead screw (14) of the lead screw nut pair is rotatably arranged in the middle connecting rod (4), the connecting component is rotatably connected with the fixing component, the first locking device is connected with the connecting component, when the second locking device is located at a first position, the middle connecting rod (4) and the connecting component can slide relatively, and when the second locking device is located at a second position, the middle connecting rod (4) is locked with the connecting component.

4. The guide wheel device according to claim 3, wherein the first locking device comprises a pull rod (7) slidably connected with the connecting assembly and an elastic member for driving the pull rod (7) to reset, the fixing member is provided with a plurality of limiting holes (9) for the end portions of the pull rod (7) to extend into, a first end of the elastic member is connected with the pull rod (7), a second end of the elastic member is connected with the connecting assembly, when the pull rod (7) is tensioned, the end portions of the pull rod (7) are pulled out of the limiting holes (9), and the elastic member is deformed; when the pull rod (7) is loosened, the elastic piece recovers deformation and drives the end part of the pull rod (7) to stretch into the limiting hole (9).

5. The guide wheel device according to claim 4, wherein the connecting assembly comprises an outer connecting rod (3) sleeved outside the middle connecting rod (4) and a frame-shaped connecting plate (2) fixedly connected with the outer connecting rod (3), the outer connecting rod (3) and the inner connecting rod (5) can be locked by the second locking device, the frame-shaped connecting plate (2) is rotatably connected with the fixing member, a first sliding hole (25) for the pull rod (7) to pass through is formed in the frame-shaped connecting plate (2), the first sliding hole (25) is opposite to the limiting hole (9), and the second end of the elastic member is connected with the frame-shaped connecting plate (2).

6. The guide wheel device according to claim 5, characterized in that the second locking device comprises an eccentric sleeve (16) rotatably connected to the outer connecting rod (3), the outer connecting rod (3) is provided with a slot (33), the eccentric sleeve (16) is arranged at the slot (33), the eccentric sleeve (16) can pass through the slot (33) to abut against the middle connecting rod (4), and when the eccentric sleeve (16) rotates to the first position, the eccentric sleeve (16) is separated from the middle connecting rod (4); when the eccentric shaft sleeve (16) rotates to the second position, the eccentric shaft sleeve (16) is abutted against the middle connecting rod (4).

7. The guide wheel device according to claim 5, wherein the fixing member is rotatably connected with the frame-shaped connecting plate (2) through a connecting seat, the connecting seat comprises a cylinder (11) fixedly connected with the fixing member and a limiting plate (12) fixedly connected with the cylinder (11), a through hole (10) for the cylinder (11) to pass through is formed in the frame-shaped connecting plate (2), the frame-shaped connecting plate (2) is located between the fixing member and the limiting plate (12), the frame-shaped connecting plate (2) and the cylinder (11) can rotate relatively, and the diameter of the limiting plate (12) is larger than that of the through hole (10).

8. The guide wheel device according to claim 2, wherein the lifting assembly further comprises a handle (6) for controlling the rotation of the lead screw (14) of the lead screw-nut pair, the handle (6) is arranged at the top end of the fixing assembly, and the top end of the lead screw (14) of the lead screw-nut pair passes through the fixing assembly and is fixedly connected with the handle (6).

9. The guide wheel device according to claim 5, wherein the pull rod (7) comprises a handle portion (34) and two sliding rod portions (35), first ends of the two sliding rod portions (35) are respectively fixedly connected with two ends of the handle portion (34), the frame-shaped connecting plate (2) is provided with two first sliding holes (25) through which the two sliding rod portions (35) respectively pass, second ends of the sliding rod portions (35) can extend into the limiting holes (9), the number of the elastic members is two, the first ends of the two elastic members are respectively connected with the two sliding rod portions (35), and the second ends of the two elastic members are both connected with the frame-shaped connecting plate (2).

10. A pull type caravan, which comprises a caravan body and is characterized by further comprising a guide wheel device arranged on the front side of the bottom end of the caravan body, wherein the guide wheel device is the guide wheel device according to any one of claims 1 to 9.

Technical Field

The application relates to the technical field of pulling type motor homes, in particular to a guide wheel device and a pulling type motor home.

Background

The pull type caravan does not have a power system, the function of walking is achieved by pulling the trailer, the trailer is required to arrive at a designated parking place, the trailer is pulled to be separated from the caravan after the trailer is arrived at the parking place, the parking position is not accurate enough, the parking terrain is not suitable enough, fine adjustment is frequently required to be carried out on the position of the caravan, and the existing pull type caravan is difficult to adjust the position due to the fact that no guide wheel exists, and time and labor are wasted.

Therefore, how to solve the problem that the position of the existing pull type caravan is time-consuming and labor-consuming when the position is adjusted without a guide wheel is a key technical problem to be solved by technical personnel in the field.

Disclosure of Invention

For overcoming the problem that exists in the correlation technique at least to a certain extent, the utility model aims at providing a leading wheel device and pull type car as a house, it can solve current pull type car as a house does not have the leading wheel and the problem that wastes time and energy when carrying out position control.

The application provides a leading wheel device, including the leading wheel, be used for control the telescoping device that the leading wheel goes up and down with be used for receiving and releasing the winding and releasing device of leading wheel, winding and releasing device is including being used for the mounting that is connected with the pull type car as a house and being used for locking the first locking device of leading wheel, the telescoping device with the mounting is rotationally connected, the leading wheel is installed the flexible end of telescoping device, first locking device with the telescoping device is connected, just first locking device can with the mounting locks mutually.

Preferably, the telescopic device comprises a fixing component and a lifting component, wherein the fixing component is rotatably connected with the fixing component, the lifting component is used for controlling the guide wheel to lift, the lifting component comprises a screw nut pair arranged in the fixing component and an internal connecting rod connected with the guide wheel, a screw of the screw nut pair is rotatably connected with the fixing component, and the internal connecting rod is fixedly connected with a nut of the screw nut pair.

Preferably, the fixed subassembly is including middle part connecting rod, cover the coupling assembling outside the middle part connecting rod with be used for locking coupling assembling with the second locking device of middle part connecting rod, the vice lead screw of screw-nut rotationally sets up in the middle part connecting rod, coupling assembling with the mounting is rotationally connected, first locking device with coupling assembling is connected, works as when second locking device is located the primary importance, the middle part connecting rod with coupling assembling can relative slip, works as when second locking device is located the second place, the middle part connecting rod with coupling assembling locks mutually.

Preferably, the first locking device comprises a pull rod connected with the connecting assembly in a sliding manner and an elastic element for driving the pull rod to reset, the fixing element is provided with a plurality of limiting holes into which the end portions of the pull rod extend, the first end of the elastic element is connected with the pull rod, the second end of the elastic element is connected with the connecting assembly, when the pull rod is tensioned, the end portions of the pull rod are separated from the limiting holes, and the elastic element deforms; when the pull rod is loosened, the elastic piece recovers deformation and drives the end part of the pull rod to stretch into the limiting hole.

Preferably, coupling assembling establishes including the cover outside the middle part connecting rod and with outside connecting rod fixed connection's frame type connecting plate, second locking device can with outside connecting rod with inside connecting rod locks mutually, frame type connecting plate with the mounting is rotationally connected, just be provided with the confession on the frame type connecting plate the first slide opening that the pull rod passed, first slide opening with spacing hole sets up relatively, the second end of elastic component with frame type connecting plate is connected.

Preferably, the second locking device comprises an eccentric shaft sleeve rotatably connected to the external connecting rod, the external connecting rod is provided with a notch, the eccentric shaft sleeve is arranged at the notch, the eccentric shaft sleeve can penetrate through the notch to be tightly abutted against the middle connecting rod, and when the eccentric shaft sleeve rotates to the first position, the eccentric shaft sleeve is separated from the middle connecting rod; when the eccentric shaft sleeve rotates to the second position, the eccentric shaft sleeve is abutted against the middle connecting rod.

Preferably, the mounting pass through the connecting seat with frame type connecting plate rotationally connects, the connecting seat including with mounting fixed connection's cylinder and with cylinder fixed connection's limiting plate, be provided with the confession on the frame type connecting plate the through-hole that the cylinder passed, frame type connecting plate is located the mounting with between the limiting plate, just frame type connecting plate and cylinder can rotate relatively, the diameter of limiting plate is greater than the diameter of through-hole.

Preferably, the lifting assembly further comprises a handle for controlling a screw of the screw-nut pair to rotate, the handle is arranged at the top end of the fixing assembly, and the top end of the screw-nut pair penetrates through the fixing assembly and is fixedly connected with the handle.

Preferably, the pull rod comprises a handle part and two sliding rod parts, the first ends of the sliding rod parts are fixedly connected with the two ends of the handle part respectively, the frame-shaped connecting plate is provided with two first sliding holes for the sliding rod parts to pass through, the second ends of the sliding rod parts can stretch into the limiting holes, the elastic parts are provided with two first ends and two second ends, the first ends of the elastic parts are connected with the two sliding rod parts respectively, and the second ends of the elastic parts are connected with the frame-shaped connecting plate.

The application also provides a pull type motor home, including the motor home body, still including setting up the leading wheel device of motor home body bottom front side, the leading wheel device be as above-mentioned arbitrary one pull type motor home's leading wheel device.

The technical scheme provided by the application can comprise the following beneficial effects:

the application provides a leading wheel device and pull type car as a house installs this leading wheel device on pull type car as a house, adjusts the state that receive and releases of leading wheel through winding and unwinding devices, at the normal in-process of traveling of car as a house, can rotate telescoping device to horizontal position to through first locking device with telescoping device and mounting locking, when the car as a house needs the parking, rotate telescoping device to vertical position, and go up and down through telescoping device control leading wheel, make leading wheel and ground contact. So set up, solved current pull-type car as a house and do not have the leading wheel and waste time and energy's problem when carrying out position adjustment.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a perspective view of a guide wheel apparatus shown in accordance with some exemplary embodiments;

FIG. 2 is a side view of a guide wheel apparatus shown in accordance with some exemplary embodiments;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is an exploded view of a guide wheel apparatus shown in accordance with some exemplary embodiments;

FIG. 5 is a diagram illustrating a connection of a tension rod to a spring according to some exemplary embodiments;

FIG. 6 is an exploded view of a guide wheel shown in accordance with some exemplary embodiments;

FIG. 7 is a perspective view of a frame-type connection plate shown in connection with a fixation plate according to some exemplary embodiments;

FIG. 8 is a plan view of a connection of a frame-type connection plate to a fixed plate, according to some exemplary embodiments;

FIG. 9 is a cross-sectional view B-B of FIG. 8;

FIG. 10 is a perspective view of a frame-type connection plate shown in accordance with some exemplary embodiments;

FIG. 11 is a perspective view of a tie rod according to some exemplary embodiments;

FIG. 12 is a perspective view of an outer link shown in accordance with some exemplary embodiments.

In the figure:

1. a fixing plate; 2. a frame-shaped connecting plate; 3. an outer link; 4. a middle connecting rod; 5. an inner link; 6. a handle; 7. a pull rod; 8. a spring; 9. a limiting hole; 10. a through hole; 11. a cylinder; 12. a limiting plate; 13. mounting holes; 14. a lead screw; 15. a nut; 16. an eccentric shaft sleeve; 17. an eccentric bushing bolt; 18. an eccentric bushing nut; 19. a guide wheel; 20. a guide wheel fixing member; 21. a second thrust bearing; 22. a connecting bolt; 23. a first thrust bearing; 24. a bearing support plate; 25. a first slide hole; 26. a second slide hole; 27. a side plate; 28. a first bent portion; 29. a second bent portion; 30. an elastic member connecting portion; 31. a fixing pin; 32. connecting holes; 33. notching; 34. a handle portion; 35. a sliding rod part; 36. a caravan mounting hole; 37. fixing the bolt; 38. fixing a nut; 39. a sleeve.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

Referring to fig. 1 to 12, the present embodiment provides a guide wheel device of a trailer type caravan, which includes a guide wheel 19, a telescopic device and a retraction device, wherein the retraction device includes a fixing member and a first locking device, the fixing member is used for connecting with the trailer type caravan, the guide wheel 19 is installed at a telescopic end of the telescopic device, so that the telescopic device can drive the guide wheel 19 to extend and retract, thereby realizing the lifting of the guide wheel 19; the telescopic device is rotatably connected with the fixed part so as to enable the guide wheel 19 to rotate, thereby realizing the retraction of the guide wheel 19. The first locking device is connected with the telescopic device, and the first telescopic device can be locked with the fixing piece, so that the telescopic device and the fixing piece are locked by the first locking device, the telescopic device can be locked at a horizontal or vertical position, and the retraction and the release of the guide wheel 19 are realized.

Wherein, the mounting can be fixed plate 1, and fixed plate 1 is through a plurality of bolts and pull type car as a house fixed connection, is provided with a plurality of car as a house mounting holes 36 that supply the bolt to pass on the fixed plate 1.

Install this leading wheel device on pull-type car as a house, adjust the receive and release state of leading wheel 19 through receiving and releasing device, at the normal driving in-process of car as a house, can rotate telescoping device to horizontal position to locking telescoping device and mounting through first locking device, when the car as a house needs to park, rotate telescoping device to vertical position, and through the lift of telescoping device control leading wheel 19, make leading wheel 19 and ground contact.

So set up, solved current pull-type car as a house and do not have the leading wheel and waste time and energy's problem when carrying out position adjustment.

In this embodiment, the telescopic device includes a fixing component and a lifting component, the fixing component is rotatably connected with the fixing component, the lifting component is used for controlling the guide wheel 19 to lift, wherein, as shown in fig. 3, the lifting component includes a screw-nut pair and an inner connecting rod 5, the screw-nut pair is disposed in the fixing component, a screw 14 of the screw-nut pair is rotatably connected with the fixing component, the inner connecting rod 5 is fixedly connected with a nut 15 of the screw-nut pair, and the guide wheel 19 is mounted at the bottom end of the inner connecting rod 5 so as to be capable of moving up and down along with the inner connecting rod 5, thereby realizing the lifting of the guide wheel 19.

Further, the lifting assembly further comprises a handle 6 used for controlling the rotation of a lead screw 14 of the lead screw nut pair, the handle 6 is arranged at the top end of the fixing assembly, and the top end of the lead screw 14 of the lead screw nut pair penetrates through the fixing assembly to be fixedly connected with the handle 6. Thus, the lifting of the nut 15 of the screw-nut pair, that is, the lifting of the guide wheel 19, can be realized by rotating the handle 6.

The fixing assembly comprises a middle connecting rod 4, a connecting assembly and a second locking device, a lead screw 14 of the lead screw nut pair is rotatably arranged in the middle connecting rod 4, the connecting assembly is sleeved outside the middle connecting rod 4, and the connecting assembly is rotatably connected with the fixing piece so as to realize the rotatable connection of the telescopic device and the fixing piece.

It should be noted that the top end of a screw 14 of the screw-nut pair penetrates through the top end of the middle connecting rod 4 to be connected with the handle 6, and the top end of the screw 14 of the screw-nut pair is fixedly connected with the handle 6 through a pin shaft. The middle link 4 is rotatably connected to the lead screw 14 by a first thrust bearing 23, and a bearing support plate 24 fixedly connected to the lead screw 14 is provided at a lower end of the first thrust bearing 23.

The second locking device is used for locking the connecting assembly and the middle connecting rod 4, so that the middle connecting rod 4 and the connecting assembly are relatively fixed. When the second locking device is located at the first position, the middle connecting rod 4 and the connecting assembly can slide relatively, namely the middle connecting rod 4 can move up and down, so that the screw nut pair, the inner connecting rod 5 and the guide wheel 19 can be driven to move up and down, and the guide wheel 19 can be quickly lifted up and down, so that the guide wheel 19 can be quickly contacted with the ground; when the second locking device is located at the second position, the middle connecting rod 4 is locked with the connecting assembly, that is, the middle connecting rod 4 is relatively fixed with the connecting assembly, and the middle connecting rod 4 cannot move up and down continuously.

Here, a first locking device is connected to the connecting assembly in order to lock the telescopic device to the fixing element.

In this embodiment, the first locking device includes a pull rod 7 and an elastic member, the pull rod 7 is connected with the coupling assembling in a sliding manner, and the fixing member is provided with a plurality of limiting holes 9 for the pull rod 7 to extend into, and a first end of the elastic member is connected with the pull rod 7 and a second end of the elastic member is connected with the coupling assembling to drive the pull rod 7 to reset.

When the pull rod 7 is tensioned, the end part of the pull rod 7 is separated from the limiting hole 9, namely the pull rod 7 is separated from the fixing part, at the moment, the connecting assembly can rotate relative to the fixing part, so that the guide wheel 19 can be driven to rotate to the horizontal position or the vertical position, and the retraction and the release of the guide wheel 19 are realized. When the pull rod 7 is loosened, the elastic part restores to deform, the elastic part drives the end part of the pull rod 7 to extend into the limiting hole 9, the pull rod 7 is connected with the fixing part, the connecting assembly and the fixing part are relatively fixed and cannot rotate continuously, and the guide wheel 19 is fixed at a horizontal position or a vertical position.

Specifically, the connecting assembly comprises an external connecting rod 3 and a frame-shaped connecting plate 2, the external connecting rod 3 is sleeved outside a middle connecting rod 4, the external connecting rod 3 and an internal connecting rod 5 can be locked by a second locking device, the frame-shaped connecting plate 2 is fixedly connected with the external connecting rod 3, and the frame-shaped connecting plate 2 is rotatably connected with the fixing piece.

Wherein, be provided with first slide opening 25 on the frame type connecting plate 2 to supply pull rod 7 to pass, and first slide opening 25 sets up with spacing hole 9 relatively, so that pull rod 7 passes first slide opening 25 and stretches into in spacing hole 9, thereby realizes the relative locking of telescoping device and mounting. Here, the second end of the elastic member is connected to the frame-shaped connection plate 2.

Preferably, as shown in fig. 5, the pull rod 7 includes a handle portion 34 and two sliding rod portions 35, and first ends of the two sliding rod portions 35 are fixedly connected to two ends of the handle portion 34, respectively, where the two sliding rod portions 35 and the handle portion 34 may be of an integral structure. Two first slide holes 25 are formed in the frame-shaped connecting plate 2, the two first slide holes 25 are respectively used for the two slide rod parts 35 to penetrate through, and the two slide rod parts 35 can slide along the axial direction of the first slide holes 25, so that the second ends of the two slide rod parts 35 can extend into the limiting hole 9 or be separated from the limiting hole 9.

And, the elastic component is provided with two, and two elastic component's first end is connected with two slide bar portion 35 respectively, and the second end all is connected with frame type connecting plate 2, like this, is favorable to pull rod 7 atress balanced, is convenient for reset.

Here, four limiting holes 9 may be disposed on the fixing member, and the four limiting holes 9 are distributed in a quadrilateral shape, and the distance between two adjacent limiting holes 9 is equal to the distance between the second ends of the two sliding rod portions 35, so that the second ends of the two sliding rod portions 35 extend into the limiting holes 9.

In this embodiment, as shown in fig. 10, the frame-shaped connecting plate 2 includes a side plate 27, a first bent portion 28 and a second bent portion 29, which are formed by folding edges integrally, the side plate 27 is rotatably connected to the fixing plate 1, the first bent portion 28 and the second bent portion 29 are both provided with U-shaped openings, the size of the U-shaped openings matches with the external connecting rod 3, and the external connecting rod 3 is embedded in the U-shaped openings and welded to the first bent portion 28 and the second bent portion 29.

And first slide opening 25 sets up on curb plate 27, the one end of keeping away from curb plate 27 at first kink 28 is provided with elastic component connecting portion 30, elastic component connecting portion 30 and first kink 28 formula structure as an organic whole, and be provided with the second slide opening 26 corresponding with first slide opening 25 on the elastic component connecting portion 30, slide rod portion 35 can pass second slide opening 26 and first slide opening 25 and stretch into spacing hole 9 in, the elastic component is located between elastic component connecting portion 30 and the curb plate 27, and the second end of elastic component supports on elastic component connecting portion 30. Here, the elastic member may be a spring 8, the diameter of the spring 8 is larger than that of the second sliding hole 26, as shown in fig. 5, a sleeve 39 is further disposed between the elastic member connecting portion 30 and the side plate 27, the spring 8 is located in the sleeve 39, the sleeve 39 is connected with the sliding rod portion 35 through a fixing pin 31, and a first end of the spring abuts against the fixing pin 31, as shown in fig. 11, a connecting hole 32 for the fixing pin 31 to pass through is disposed on the sliding rod portion 35, and the connecting hole 32 is disposed near a second end of the sliding rod portion 35 to achieve connection between the elastic member and the pull rod 7.

In this embodiment, the second locking device includes an eccentric sleeve 16, the eccentric sleeve 16 is rotatably connected to the outer connecting rod 3, as shown in fig. 12, a slot 33 is formed in the outer connecting rod 3, the eccentric sleeve 16 is disposed at the slot 33, and the eccentric sleeve 16 can pass through the slot 33 to abut against the middle connecting rod 4, so as to lock the outer connecting rod 3 and the middle connecting rod 4.

Specifically, when the eccentric sleeve 16 rotates to the first position, the eccentric sleeve 16 is separated from the middle connecting rod 4, that is, the eccentric sleeve 16 and the middle connecting rod 4 generate a gap, so that the middle connecting rod 4 can slide relative to the outer connecting rod 3, thereby realizing rapid lifting of the guide wheel 19. When the eccentric sleeve 16 rotates to the second position, the eccentric sleeve 16 abuts against the middle connecting rod 4, and at this time, the eccentric sleeve 16 and the middle connecting rod 4 are relatively fixed, that is, the middle connecting rod 4 and the outer connecting rod 3 are relatively fixed, and the middle connecting rod 4 cannot move up and down to lock the middle connecting rod 4.

The second locking device further comprises an eccentric shaft sleeve bolt 17 and an eccentric shaft sleeve nut 18, bolt holes for the screw rods of the eccentric shaft sleeve bolt 17 to penetrate through are formed in two sides of the notch 33, the eccentric shaft sleeve nut 18 can lock the eccentric shaft sleeve bolt 17, the eccentric shaft sleeve nut 18 is fixedly connected with the external connecting rod 3, the eccentric shaft sleeve 16 is sleeved on the eccentric shaft sleeve bolt 17, and the eccentric shaft sleeve 16 can rotate along with the eccentric shaft sleeve bolt 17. When the eccentric shaft sleeve bolt 17 is rotated clockwise (i.e. when the eccentric shaft sleeve bolt 17 is fastened clockwise), the eccentric shaft sleeve bolt 17 drives the eccentric shaft sleeve 16 to rotate to the second position, and the eccentric shaft sleeve 16 is abutted against the middle connecting rod 4; when the eccentric sleeve bolt 17 is rotated counterclockwise (i.e. when the eccentric sleeve bolt 17 is loosened), the eccentric sleeve bolt 17 drives the eccentric sleeve 16 to rotate to the first position, and the eccentric sleeve 16 is separated from the middle connecting rod 4.

In this embodiment, the fixing member is rotatably connected to the frame-shaped connecting plate 2 through a connecting seat, the connecting seat includes a cylinder 11 and a limiting plate 12, the cylinder 11 is fixedly connected to the fixing member, the limiting plate 12 is fixedly connected to the cylinder 11, here, the cylinder 11 and the limiting plate 12 are connected to the fixing member through a fixing bolt 37 and fastened together through a fixing nut 38, and a mounting hole 13 for the fixing bolt 37 to pass through is formed in the fixing member. As shown in fig. 10, a through hole 10 for the cylinder 11 to pass through is provided on the frame-shaped connecting plate 2, the frame-shaped connecting plate 2 is located between the fixing member and the limiting plate 12, that is, the frame-shaped connecting plate 2 is sleeved outside the cylinder 11, and the frame-shaped connecting plate 2 and the cylinder 11 can rotate relatively, so that the telescopic device is rotatably connected with the fixing member. Therefore, the structure is simple, the processing is convenient, the safety and the reliability are realized, and the manufacturing cost can be greatly reduced.

It should be noted that the diameter of the limiting plate 12 is larger than the diameter of the through hole 10, so as to limit the frame-shaped connecting plate 2 and prevent the frame-shaped connecting plate 2 from separating from the fixing member.

In this embodiment, the guide wheel 19 is connected to the telescopic device through the guide wheel fixing member 20, an included angle between a plane where the guide wheel fixing member 20 is located and an axis of the telescopic device is 145 degrees, the guide wheel fixing member 20 is an integrally formed U-shaped plate structure, and the guide wheel fixing member 20 and the inner link 5 are rotatably connected through the second thrust bearing 21, so that the guide wheel 19 becomes a universal wheel to facilitate position adjustment.

Here, as shown in fig. 6, the bottom end of the inner connecting rod 5 is provided with a connecting bolt 22, the inner ring of the second thrust bearing 21 is fixedly sleeved outside the connecting bolt 22, the outer ring of the second thrust bearing 21 is fixedly connected with the U-shaped plate structure, and the bottom end of the connecting bolt 22 passes through the top end of the U-shaped plate structure and extends into the U-shaped groove of the U-shaped plate structure, and the bottom end of the connecting bolt 22 is provided with a fastening nut so that the U-shaped plate structure can be hung on the connecting bolt 22 to improve the connection stability of the guide wheel 19 and the inner connecting rod 5.

It should be noted that the inner link 5, the middle link 4 and the outer link 3 are square rods and have sizes matched with each other to prevent relative rotation between the inner link 5, the middle link 4 and the outer link 3.

This embodiment provides a leading wheel device of pull type car as a house, install the front side in pull type car as a house bottom, in the normal driving process of pull type car as a house, leading wheel 19 is in the level state of folding up, when needs are parked, at first taut pull rod 7, thereby deviate from in the spacing hole 9 of the second end of two slide bar portion 35 of messenger pull rod 7, rotate leading wheel 19 or inside connecting rod 5 this moment, make the telescoping device wholly rotate to vertical direction, thereby make leading wheel 19 be located vertical direction, then loosen pull rod 7, make the second end of slide bar portion 35 stretch into in the spacing hole 9 of fixed plate 1, thereby make the whole locking of telescoping device at vertical position, even the locking of leading wheel 19 is in vertical position. The handle 6 is then rotated to extend the guide wheel 19 downwardly into secure contact with the ground. Or, the position of the eccentric shaft sleeve 16 can be adjusted, and the middle connecting rod 4 can be quickly lowered or pulled, so that the middle connecting rod 4 drives the guide wheel 19 to quickly fall to contact with the ground, and the guide wheel 19 can be quickly lifted. Like this, can realize also adjusting eccentric sleeve 16 and manually pulling out when leading wheel 19 is flexible through twist grip 6 and drag middle part connecting rod 4 and realize quick lift, simple structure, convenient operation.

This embodiment also provides a pull type car as a house, including car as a house body and leading wheel device, the leading wheel device sets up the front side in car as a house body bottom to this leading wheel device is the leading wheel device of pull type car as a house of any one of above-mentioned embodiment. Here, the derivation process of the beneficial effect of the trailer type recreational vehicle is the same as the derivation process of the beneficial effect of the guide wheel device of the trailer type recreational vehicle, and thus, the description thereof is omitted.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.