Bicycle chain expander with axial thrust bearing

Abstract

The utility model relates to the field of bicycles, and discloses a bicycle chain tensioner with an axial thrust bearing, which comprises a swing frame, the front surface of the swing frame is rotatably connected with a tensioning wheel, the front surface of the swing frame is rotatably connected with a fixed frame through a connecting component, and the swing frame is elastically connected with the fixed frame through a torsion spring; the connecting assembly comprises a connecting bolt, the connecting bolt penetrates through and is in threaded connection with the front surface of the swing frame, an outer groove and an inner groove are formed in the front surface and the rear surface of the fixing frame respectively, a first bearing is installed on the inner wall of the outer groove, and a second bearing is installed on the inner wall of the inner groove. According to the utility model, through the bearing I and the bearing II, after the whole device is assembled, the left end and the right end of the bearing I are respectively contacted with the connecting bolt and the convex ring, and the left end and the right end of the bearing II are respectively contacted with the convex ring and the boss, so that even if the connecting bolt is mounted tightly, the swing frame and the fixed frame can respond quickly when rotating relatively.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of bicycle, especially a bicycle chain tensioner with axial thrust bearing. BACKGROUND

[0002] The bicycle is a device for assisting the operator to move, which is mainly composed of a frame, wheels and a handle, etc. The common bicycle in the prior art mainly relies on a chain for transmission. This transmission mode is relatively stable and has good transmission effect.

[0003] In the bicycle driven by the chain, the chain may fall off the freewheel or be displaced due to the impact force on the vehicle or the chain. In order to prevent such situations, a chain tensioner is usually used. The current chain tensioner is mainly divided into independent type and type attached to the derailleur. It generally adopts a sliding bearing structure. However, the fastening degree of the chain tensioner shaft will affect its rotation performance. Over-fastening will hinder rotation, resulting in slow reaction of the chain tensioner. Insufficient fastening will cause the chain tensioner arm to sway, causing the chain to fall off. The tension balance is difficult to adjust and needs to be adjusted frequently. Therefore, a bicycle chain tensioner with axial thrust bearing is proposed to solve the above problems. SUMMARY

[0004] In order to make up for the above shortcomings, the utility model provides a bicycle chain tensioner with axial thrust bearing, which aims to solve the problem of "the fastening degree of the chain tensioner shaft affecting its rotation performance and the need for frequent adjustment" in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: the bicycle chain tensioner with axial thrust bearing, including the swing frame, the front surface of the swing frame is rotatably connected with the tensioning wheel, the front surface of the swing frame is rotatably connected with the fixed frame through the connecting assembly, and the swing frame and the fixed frame are elastically connected through the torsional spring; the connecting assembly includes a connecting bolt, the connecting bolt penetrates and is threadedly connected to the front surface of the swing frame, the front and rear surfaces of the fixed frame are respectively provided with an outer groove and an inner groove, a bearing one is installed on the inner wall of the outer groove, a bearing two is installed on the inner wall of the inner groove, the connecting bolt penetrates the bearing one and the bearing two, the inner wall of the swing frame is provided with a boss, and the boss is inserted into the inner wall of the inner groove.

[0006] As a further description of the above technical scheme:

[0007] The inner wall of the boss is provided with a clamping groove one, the inner wall of the swing frame is provided with a clamping groove two, and one end of the torsional spring is clamped to the inner wall of the clamping groove one and the other end is clamped to the inner wall of the clamping groove two.

[0008] As a further description of the above technical scheme:

[0009] The connecting bolt is arranged as a long rod bolt.

[0010] As a further description of the above technical solution:

[0011] The inner wall of the inner groove is provided with a convex ring.

[0012] As a further description of the above technical solution:

[0013] The rear surface of the outer groove is attached to the front surface of the convex ring, and the front surface of the bearing two is attached to the rear surface of the convex ring.

[0014] As a further description of the above technical solution:

[0015] The clamping groove one is provided with multiple groups, and the multiple groups of the clamping groove one are rotationally arranged with the center line of the convex post as the rotation axis.

[0016] The utility model has the following beneficial effects:

[0017] 1、 the utility model discloses, through bearing one and bearing two, when the overall device is assembled, the left and right two ends of bearing one are in contact with connecting bolt and convex ring respectively, and the left and right two ends of bearing two are in contact with convex ring and convex post respectively, so that even if connecting bolt is installed tightly, the swing frame and the fixed frame can respond quickly when relative rotation occurs, which can reduce the difficulty of debugging the overall device and improve the reliability and durability of the overall device. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the three-dimensional structure schematic diagram of the overall device in the utility model;

[0019] Figure 2 It is the three-dimensional structure split schematic diagram of the overall device in the utility model;

[0020] Figure 3 It is the three-dimensional structure split schematic diagram of the connecting assembly in the utility model;

[0021] Figure 4 It is the inside schematic diagram of the three-dimensional structure of the swing frame and the fixed frame in the utility model.

[0022] LEGEND:

[0023] 1, swing frame;2, fixed frame;3, connecting assembly;31, connecting bolt;32, bearing one;33, bearing two;34, outer groove;35, convex post;36, inner groove;37, convex ring;4, tensioning wheel;5, torsional spring;6, clamping groove one;7, clamping groove two. DETAILED DESCRIPTION

[0024] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. Figures 1-3 The utility model provides an embodiment: a bicycle chain tensioner with axial thrust bearing, including swing frame 1 for driving tensioner 4 to rotate, swing frame 1's front surface is rotatably connected with tensioner 4 for extruding chain, swing frame 1's front surface is rotatably connected with fixed frame 2 for supporting overall device through connecting assembly 3, fixed frame 2 is directly connected with vehicle body in use, because the installation of fixed frame 2 is prior art, and the personnel of the art can realize, so the case does not make too much description, swing frame 1 and fixed frame 2 are elastically connected through torsion spring 5, and torsion spring 5 can drive swing frame 1 to rotate outward, and swing frame 1 rotating outward can drive tensioner 4 to extrude chain and make it tight;Connecting assembly 3 includes connecting bolt 31 for realizing connection, and connecting bolt 31 is penetrated and is connected in the front surface of swing frame 1, and the front and rear surfaces of fixed frame 2 are respectively provided with outer groove 34 and inner groove 36 for accommodating bearing, the inner wall of outer groove 34 is provided with bearing one 32 for supporting connecting bolt 31, the inner wall of inner groove 36 is provided with bearing two 33 for supporting swing frame 1, connecting bolt 31 is penetrated bearing one 32 and bearing two 33, and bearing one 32 and bearing two 33 are all thrust ball bearings, the inner wall of swing frame 1 is provided with boss 35 for extruding bearing two 33, and boss 35 is inserted in the inner wall of inner groove 36, and swing frame 1 can be supported through the setting of boss 35 and bearing two 33, so fixed frame 2 and swing frame 1 will not be closely fitted, and they can only be supported by bearing two 33 to rotate boss 35, so it can prevent swing frame 1 from being slow in response due to close connection.

[0026] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. Figures 2-4 The inner wall of boss 35 is provided with clamping groove one 6 for fixing torsion spring 5, the inner wall of swing frame 1 is provided with clamping groove two 7 for fixing the other end of torsion spring 5, one end of torsion spring 5 is clamped in the inner wall of clamping groove one 6, and the other end is clamped in the inner wall of clamping groove two 7, and swing frame 1 can be rotated by extruding clamping groove one 6 through the cooperation of clamping groove one 6 and clamping groove two 7 when the surface tension of chain is small, and tensioner 4 can extrude chain and make it tight by rotating swing frame 1, connecting bolt 31 is provided as long rod bolt, and the probability of connecting bolt 31 outer wall and bearing inner ring contact can be reduced by using long rod bolt, and the inner wall of inner groove 36 is provided with convex ring 37 for supporting bearing.

[0027] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.Figures 1-3 The rear surface of the outer groove 34 is attached to the front surface of the convex ring 37, and the front surface of the bearing two 33 is attached to the rear surface of the convex ring 37, so the convex ring 37 can prevent the two groups of bearings from directly contacting each other, thereby enhancing the stability of the bearing fixation, and the plurality of groups of the clamping grooves one 6 are arranged in a rotating array with the center line of the convex post 35 as the rotating axis, and the plurality of groups of the clamping grooves one 6 can change the initial tension of the torsional spring 5 by adjusting the torsional spring 5 to be clamped into different clamping grooves one 6.

[0028] Working principle: when the surface tension of the chain changes, the torsional spring 5 will start to work, because one end of the torsional spring 5 is clamped in the clamping groove one 6 on the inner wall of the convex post 35, and the other end is clamped in the clamping groove two 7 on the inner wall of the swing frame 1, therefore, the elastic force of the torsional spring 5 will push the clamping groove one 6, thereby driving the swing frame 1 to rotate outward around the connecting bolt 31 of the connecting assembly 3. Because the front surface of the swing frame 1 is rotationally connected to the tensioner wheel 4, the rotation of the swing frame 1 will drive the tensioner wheel 4 to rotate synchronously, and the tensioner wheel 4 will squeeze the chain, so that the chain is re-tightened and restored to the appropriate tension, effectively avoiding the situation that the chain falls off or shifts from the flywheel.

[0029] The bearing one 32 and the bearing two 33 in the connecting assembly 3 play a key role in supporting and reducing resistance in this process, the bearing one 32 is installed on the inner wall of the outer groove 34 on the front surface of the fixed frame 2, and the left and right ends thereof are in contact with the connecting bolt 31 and the convex ring 37 respectively; the bearing two 33 is installed on the inner wall of the inner groove 36 on the rear surface of the fixed frame 2, and the left and right ends thereof are in contact with the convex ring 37 and the convex post 35 on the inner wall of the swing frame 1 respectively, and this structure design makes it possible for the swing frame 1 and the fixed frame 2 to quickly respond to the force of the torsional spring 5 by means of the rolling friction of the bearing one 32 and the bearing two 33 when the swing frame 1 and the fixed frame 2 relatively rotate even if the connecting bolt 31 is installed relatively tightly, thereby reducing the debugging difficulty and improving the reliability and durability of the chain tensioner.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements for some technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. Bicycle chain tensioner with axial thrust bearing, comprising a swing bracket (1), characterised in that: The front surface of the swing frame (1) is rotationally connected with a tensioning wheel (4), the front surface of the swing frame (1) is rotationally connected with a fixed frame (2) through a connecting assembly (3), the swing frame (1) and the fixed frame (2) are elastically connected through a torsion spring (5); The connecting assembly (3) comprises a connecting bolt (31), the connecting bolt (31) is penetrated and threadedly connected to the front surface of the swing frame (1), the front and rear surfaces of the fixed frame (2) are respectively provided with an outer groove (34) and an inner groove (36), the inner wall of the outer groove (34) is mounted with a bearing one (32), the inner wall of the inner groove (36) is mounted with a bearing two (33), the connecting bolt (31) is penetrated through the bearing one (32) and the bearing two (33), the inner wall of the swing frame (1) is provided with a boss (35), the boss (35) is inserted into the inner wall of the inner groove (36).

2. Bicycle chain tensioner with axial thrust bearing according to claim 1, characterized in that The inner wall of the boss (35) is provided with a clamping groove one (6), the inner wall of the swing frame (1) is provided with a clamping groove two (7), one end of the torsion spring (5) is clamped to the inner wall of the clamping groove one (6) and the other end is clamped to the inner wall of the clamping groove two (7).

3. A bicycle chain tensioner with axial thrust bearing according to claim 1, characterized in that: The connecting bolt (31) is a long rod bolt.

4. The bicycle chain tensioner with axial thrust bearing of claim 1, wherein: The inner wall of the inner groove (36) is provided with a convex ring (37).

5. A bicycle chain tensioner with axial thrust bearing according to claim 4, characterized in that: The rear surface of the outer groove (34) is attached to the front surface of the convex ring (37), and the front surface of the bearing two (33) is attached to the rear surface of the convex ring (37).

6. A bicycle chain tensioner with axial thrust bearing according to claim 2, characterized in that: The clamping groove one (6) is provided with multiple groups, and the multiple groups of the clamping groove one (6) are rotationally arranged with the center line of the boss (35) as the rotation axis.

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