Front wheel assembly and baby stroller

Abstract

The present invention discloses a front wheel assembly and a baby carriage, comprising a shaft sleeve and a rotating shaft connected to a frame, wherein the outer side surface of the rotating shaft is provided with at least one first inclined surface, and the inner side surface of the shaft sleeve is provided with a second inclined surface corresponding to the first inclined surface, and the shaft sleeve is abutted against the first inclined surface through the second inclined surface; when the rotating shaft is rotatably engaged in the shaft sleeve, the first inclined surface is rotatably engaged on the second inclined surface. The present invention provides a front wheel assembly and a baby carriage that does not shake and has a long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of strollers, and in particular to a front wheel assembly and a baby stroller. Background Art

[0002] The front wheel assembly of the baby stroller includes a shaft sleeve connected to the frame, a rotating shaft rotatably connected to the shaft sleeve, a front wheel connecting seat fixedly connected to the lower end of the rotating shaft, and a front wheel rotatably set on the front wheel connecting seat. The rotation flexibility of the front wheel depends on the size of the gap between the rotating shaft and the mounting hole in the shaft sleeve. If the gap between the rotating shaft and the mounting hole is too small, the front wheel will be inflexible in steering, and if the gap between the rotating shaft and the mounting hole is too large, the front wheel will easily shake.

[0003] According to the prior art, there is a shake-proof front wheel assembly for a child stroller and a child stroller, with publication number CN207311567U. The front wheel assembly also includes a damping device, which provides resistance to hinder the relative rotation of the sleeve and the rotating shaft when they are installed to rotate relative to each other. The damping device includes an elastic rod extending obliquely from the sleeve toward the axial direction of the hole. When the rotating shaft is inserted into the mounting hole, the end of the elastic rod abuts against the outer circumferential wall of the rotating shaft and provides elastic force. The elastic rod is used to provide elastic force to the rotating shaft to prevent shaking. During the rotation of the rotating shaft, the rotating shaft squeezes the elastic rod. After a long time, the elastic rod will produce elasticity loss and have a short service life. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned prior art and provide a front wheel assembly and a baby carriage which will not shake and has a long service life.

[0005] In order to achieve the above object, the technical solution of the present invention is: a front wheel assembly, including a shaft sleeve and a rotating shaft connected to a frame,

[0006] The outer side surface of the rotating shaft is provided with at least one first inclined surface, and the inner side surface of the sleeve is provided with a second inclined surface corresponding to the first inclined surface, and the sleeve rests against the first inclined surface through the second inclined surface; when the rotating shaft is rotatably fitted in the sleeve, the first inclined surface is rotatably fitted on the second inclined surface.

[0007] After adopting the above structure, the present invention has the following advantages compared with the prior art: at least one first inclined surface is provided on the outer side surface of the rotating shaft, and a second inclined surface corresponding to the first inclined surface is provided on the inner wall of the sleeve, and the sleeve is pressed against the first inclined surface through the second inclined surface. Since the sleeve and the frame have a certain dead weight, the second inclined surface is pressed against the first inclined surface by relying on the dead weight of the sleeve and the frame, ensuring that the gap between the sleeve and the rotating shaft is small and there is no shaking; and the rotating shaft cooperates with the sleeve inclined surface through the first inclined surface, and there is no need to additionally set an elastic rod, so the service life is long.

[0008] Preferably, the number of the first inclined surfaces is two, and the first inclined surfaces are respectively located at two ends of the rotating shaft, so that the rotating shaft is evenly stressed and the rotating shaft rotates more smoothly.

[0009] Preferably, the outer side surface of the rotating shaft is provided with a protrusion protruding from the outer side surface of the rotating shaft, the first inclined surface is provided on the protrusion, and the protrusion is rotatably fitted in the shaft sleeve to facilitate the setting of the first inclined surface.

[0010] Preferably, the first inclined surface is arranged on the outer circumference of the protrusion, which is a first embodiment.

[0011] Preferably, a groove is provided on the upper surface of the protrusion, and the first inclined surface is the inner side wall of the groove, which is a second embodiment.

[0012] Preferably, the first inclined surface and the second inclined surface are both annular, the contact area between the rotating shafts is large, and the rotating shafts rotate more smoothly.

[0013] Preferably, the protrusion and the rotating shaft are of a split structure or an integrated structure.

[0014] Preferably, the cross section of the first inclined surface is in the shape of an oblique line or an arc line.

[0015] A baby carriage comprises a front wheel assembly as described in any one of the above items.

[0016] Preferably, the shaft sleeve is detachably connected to the vehicle frame to facilitate installation and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front sectional view of the front wheel assembly of the present invention.

[0018] Figure 2 yes Figure 1 A is an enlarged schematic diagram.

[0019] Figure 3 It is a stereoscopic view of a first embodiment of the front wheel assembly shaft of the present invention.

[0020] Figure 4 It is a front sectional view of a second embodiment of the front wheel assembly shaft of the present invention.

[0021] Figure 5 It is a stereoscopic diagram of the front wheel assembly of the present invention applied to a baby carriage.

[0022] Among them, 1, frame, 2, bushing, 210, through hole, 3, rotating shaft, 310, protrusion, 311, groove, 4, first inclined surface, 5, second inclined surface. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Figure 1 is a front cross-sectional view of the front wheel assembly of the present invention, Figure 2 yes Figure 1 The enlarged schematic diagram of A in FIG. Figure 1 and 2 In the illustrated embodiment, the present invention provides a front wheel assembly, including a rotating shaft 3 and a sleeve 2 connected to a vehicle frame 1, a through hole 210 is provided in the sleeve 2, the through hole 210 is arranged along the axis direction of the sleeve 2, and the rotating shaft 3 is rotatably fitted in the through hole 210. Specifically, a first inclined surface 4 is provided on the outer side surface of the rotating shaft 3, and a second inclined surface 5 corresponding to the first inclined surface 4 is provided on the inner side wall of the through hole 210, and the second inclined surface 5 is located above the corresponding first inclined surface 4. When the rotating shaft 3 is rotated and fitted in the through hole 210, the first inclined surface 4 and the second inclined surface 5 are rotated and fitted, and the second inclined surface 5 of the sleeve 2 is against the first inclined surface 4. Since the sleeve 2 and the frame 1 have a certain weight, the second inclined surface 5 is pressed against the first inclined surface 4 by relying on the weight of the sleeve 2 and the frame 1, ensuring that the gap between the sleeve 2 and the rotating shaft 3 is small and there is no shaking. The second inclined surface 5 is the inner wall of the through hole 210, which is not easy to be damaged and has a long service life. Except for the second inclined surface 5, there is a certain gap between the inner wall of the through hole 210 and the rotating shaft 3, and the rotating shaft 3 is flexible in steering.

[0025] Specifically, the second inclined surface 5 is a part of the inner wall of the through hole 210. The diameter of the upper end of the through hole 210 is larger than the diameter of the lower end of the through hole 210. The second inclined surface 5 is used to transition between the upper end of the through hole 210 and the lower end of the through hole 210. When the first inclined surface 4 and the second inclined surface 5 are rotationally matched, other positions on the outer side of the rotating shaft 3 are also rotationally matched with other positions of the through hole 210.

[0026] As an embodiment, there are two first bevels 4, and the first bevels 4 are respectively located at both ends of the rotating shaft 3, and the corresponding number of second bevels 5 is also two. In this way, the two second bevels 4 of the sleeve 2 are simultaneously against the corresponding first bevels 4, so that the rotating shaft 3 is evenly stressed, and the rotating shaft 3 will not vibrate when rotating, with high reliability.

[0027] As an embodiment, the cross-section of the first inclined surface 4 is an oblique line or an arc, and correspondingly, the cross-section of the second inclined surface 5 is an oblique line or an arc, both of which can realize the first inclined surface 4 and the second inclined surface 5 to rotate together and abut against each other.

[0028] In order to facilitate the setting of the first inclined surface 4, a protrusion 310 protruding from the outer side of the rotating shaft 3 is provided on the outer side of the rotating shaft 3, and the first inclined surface 4 is provided on the protrusion 310. Specifically, the protrusion 310 is annular, and the center of the projection of the protrusion 310 on the horizontal plane is located within the projection of the rotating shaft 3 on the horizontal plane. In this way, the first inclined surface 4 can be set to be annular, so that the contact area between the first inclined surface 4 and the second inclined surface 5 is large, ensuring that the gap between the sleeve 2 and the rotating shaft 3 is small and does not shake. Furthermore, the protrusion 310 and the rotating shaft 3 are an integrated structure, which is convenient for overall manufacturing; the protrusion 310 and the rotating shaft 3 can also be a split structure, and the protrusion 310 is assembled on the rotating shaft 3, which is convenient for replacement and maintenance.

[0029] Figure 3 2 is a perspective view of a first embodiment of the front wheel assembly shaft of the present invention. Figure 3 In the illustrated embodiment, the first inclined surface 4 is disposed on the outer circumference of the protrusion 310, and has a simple structure and is easy to install. Specifically, the first inclined surface 4 is disposed between the outer side surface of the protrusion 310 and the outer side surface of the rotating shaft 3. At this time, the height of the first inclined surface 4 near the center of the rotating shaft 3 is greater than the height of the first inclined surface 4 away from the center of the rotating shaft 3. When the number of the first inclined surfaces 4 is two, the first inclined surfaces 4 are respectively located at the upper and lower ends of the protrusion 310, ensuring that the rotating shaft 3 is evenly stressed and the rotation is more stable, smoother and more flexible. Furthermore, the number of the first inclined surfaces 4 can be three or more, as long as the second inclined surface 5 is ensured to press down on the first inclined surface 4.

[0030] Figure 4 2 is a front cross-sectional view of a second embodiment of the front wheel assembly shaft of the present invention. Figure 4 In the embodiment shown, a groove 311 is provided on the upper surface of the protrusion 310, and the first inclined surface 4 is the inner side wall of the groove 311. The contact area between the rotating shaft 3 and the sleeve 2 is larger, and the rotating shaft 3 rotates more smoothly while ensuring that the rotating shaft 3 rotates flexibly without shaking. At this time, the height of the first inclined surface 4 near the center of the rotating shaft 3 is less than the height of the first inclined surface 4 away from the center of the rotating shaft 3. Specifically, the groove 311 is annular, and the first inclined surface 4 is the inner side wall of the groove 311 away from the rotating shaft 3.

[0031] Figure 5 FIG. 2 is a perspective view of the front wheel assembly of the present invention applied to a baby carriage. Figure 5In the illustrated embodiment, the present invention provides a baby carriage, including a front wheel assembly, the front wheel assembly including a rotating shaft 3 and a sleeve 2 connected to a frame 1, a through hole 210 is provided in the sleeve 2, the through hole 210 is arranged along the axis direction of the sleeve 2, and the rotating shaft 3 is rotatably fitted in the through hole 210. Specifically, a first inclined surface 4 is provided on the outer side surface of the rotating shaft 3, and a second inclined surface 5 corresponding to the first inclined surface 4 is provided on the inner side wall of the through hole 210, and the second inclined surface 5 is located above the corresponding first inclined surface 4. Relying on the weight of the frame 1, the second inclined surface 5 is pressed against the first inclined surface 4, and the second inclined surface 5 is completely fitted with the first inclined surface 4, so that the gap between the first inclined surface 4 and the second inclined surface 5 is very small and does not shake. Furthermore, the bushing 2 is fixed to the bottom surface of the frame 1 by bolts, which is convenient for installation and disassembly. At the same time, the weight of the frame 1 will press on the first inclined surface 4 of the rotating shaft 3, ensuring that the gap between the first inclined surface 4 and the second inclined surface 5 is small and does not shake. Moreover, since the first inclined surface 4 and the second inclined surface 5 are inclined surface matched, there is a certain gap between the first inclined surface 4 and the second inclined surface 5, ensuring that the rotating shaft 3 is flexible in steering.

[0032] The lower end of the rotating shaft 3 is rotatably matched with a front wheel.

[0033] As an embodiment, in order to lower the rotating shaft 3 , a portion of the rotating shaft 3 extending above the shaft sleeve 2 is provided with a snap ring, and the snap ring abuts against the upper surface of the shaft sleeve 2 .

[0034] Specifically, the principle of the present invention is to provide at least one first inclined surface 4 on the outer side surface of the rotating shaft 3, and to provide a second inclined surface 5 corresponding to the first inclined surface 4 on the inner wall of the sleeve 2. The sleeve 2 is pressed against the first inclined surface 4 through the second inclined surface 5. Since the sleeve 2 and the frame 1 have a certain dead weight, the second inclined surface 5 is pressed against the first inclined surface 4 by relying on the dead weight of the sleeve 2 and the frame 1, ensuring that the gap between the sleeve 2 and the rotating shaft 3 is small and there is no shaking; and the rotating shaft 3 cooperates with the inclined surface of the sleeve 2 through the first inclined surface 4, and there is no need to additionally set up an elastic rod, so the service life is long.

[0035] Working principle: rotate the front wheel to drive the rotating shaft 3 to rotate and fit in the through hole 210. At this time, the second inclined surface 5 rotates and fits on the first inclined surface 4. Since the frame 1 and the bushing 2 have a certain weight, the second inclined surface 5 is pressed against the first inclined surface 4 by relying on the weight of the bushing 2 and the frame 1, ensuring that the gap between the bushing 2 and the rotating shaft 3 is small and there is no shaking; and since the first inclined surface 4 and the second inclined surface 5 are beveled, there is a certain gap between the first inclined surface 4 and the second inclined surface 5, ensuring that the rotating shaft 3 is flexible in steering.

[0036] Based on the above scheme, if various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. A front wheel assembly, comprising a sleeve (2) and a rotating shaft (3) connected to a frame (1), characterized in that: The outer side surface of the rotating shaft (3) is provided with at least one first inclined surface (4), the inner side surface of the shaft sleeve (2) is provided with a second inclined surface (5) corresponding to the first inclined surface (4), and the shaft sleeve (2) abuts against the first inclined surface (4) via the second inclined surface (5); when the rotating shaft (3) is rotatably fitted in the shaft sleeve (2), the first inclined surface (4) is rotatably fitted on the second inclined surface (5).

2. The front wheel assembly according to claim 1, characterized in that: The number of the first inclined surfaces (4) is two, and the first inclined surfaces (4) are respectively located at two ends of the rotating shaft (3).

3. The front wheel assembly according to claim 1, characterized in that: The outer side surface of the rotating shaft (3) is provided with a protrusion (310) protruding from the outer side surface of the rotating shaft (3); the first inclined surface (4) is provided on the protrusion (310); and the protrusion (310) is rotatably fitted in the shaft sleeve (2).

4. The front wheel assembly according to claim 3, characterized in that: The first inclined surface (4) is arranged on the outer circumference of the protrusion (310).

5. The front wheel assembly according to claim 3, characterized in that: The upper surface of the protrusion (310) is provided with a groove (311), and the first inclined surface (4) is the inner side wall of the groove (311).

6. The front wheel assembly according to claim 1 or 3, characterized in that: The first inclined surface (4) and the second inclined surface (5) are both annular.

7. The front wheel assembly according to claim 3, characterized in that: The protrusion (310) and the rotating shaft (3) are of a split structure or an integrated structure.

8. The front wheel assembly according to claim 1, characterized in that: The cross-section of the first inclined surface (4) is in the shape of an oblique line or an arc.

9. A baby stroller, characterized in that: It comprises a front wheel assembly as described in any one of claims 1-8.

10. The front wheel assembly according to claim 9, characterized in that: The shaft sleeve (2) is detachably connected to the vehicle frame (1).

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