Seat height adjusting structure

Abstract

The utility model relates to a seat height adjusting structure which comprises a shock absorber, the lower end of the shock absorber is connected with a bottom fork in a hinged mode, the front end of the bottom fork is connected with a first hinge position on a frame in a hinged mode, the rear end of the bottom fork is used for being connected with a rear wheel, and a second hinge position is further arranged above the first hinge position on the frame. An adjusting block is hinged to a second hinge position on the frame; a third hinge position is arranged on the adjusting block, and the upper end of the shock absorber is hinged to the third hinge position on the adjusting block; when the adjusting block swings at the second hinge position, the bottom fork swings at the first hinge position synchronously, so that the angle between the bottom fork and the frame is changed; positioning mechanisms which are matched with each other are arranged on the frame and the adjusting block, and the positioning mechanisms are used for fixing the relative position of the adjusting block to the frame before and after the adjusting block swings at the second hinge position. According to the structure, the posture of the whole vehicle can be adjusted, high-low adjustment of the seat height position on the frame is achieved, parts on the vehicle and the basic structure of the whole vehicle are slightly changed, the structure is simple and easy to implement, and the adjusting operation process is safe and convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of saddle or seat adjustment of motorcycles and bicycles, and in particular relates to a seat height adjustment structure. Background Art

[0002] At present, most motorcycles on the market do not have a mechanical seat height adjustment function. When the seat height needs to be adjusted, the only way is to physically replace the seat cushion with a different thickness or the tire with a different thickness, which needs to be purchased separately and is costly.

[0003] In order to solve the above problems, some technical solutions also provide a mechanical seat height adjustment structure.

[0004] For example, in the adjustable motorcycle seats disclosed in CN207889883U and CN207889885U, the mechanical structure for adjusting the seat height is independently arranged on the seat cushion, which makes the seat cushion structure too complicated and increases the cost of the seat cushion.

[0005] There is also a recumbent vehicle such as CN202038410U, which provides multiple connection holes for the shock absorber on the frame, and can connect two shock absorbers and select different connection holes to improve the shock absorption performance and riding comfort, but it is not suitable for motorcycles. After the upper end of the shock absorber is disconnected from the hinge hole of the frame, during the process of selecting the hole for connection, the entire fork, rear wheel, and shock absorber are in a state of free rotation at the hinge point between the fork and the frame. The front and rear of the vehicle are prone to collapse at the hinge point, which is inconvenient to operate.

[0006] There is also a connecting rod mechanism for adjusting the seat height of an off-road motorcycle, as disclosed in CN201800836U, which adds multiple components such as a camshaft, a triangular connecting rod, and a connecting rod for adjustment and connection to the frame. The modification of the frame is relatively large, and the improvement and manufacturing are difficult, which will also push up the cost. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a seat height adjustment structure to avoid the inconvenience of adjusting the height of a motorcycle seat, thereby achieving the effect of simple and easy structural improvement and convenient operation.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0009] The seat height adjustment structure comprises a shock absorber, wherein the lower end of the shock absorber is hingedly connected to a flat fork, the front end of the flat fork is hingedly connected to a first hinge position on a frame, the rear end of the flat fork is used to connect a rear wheel, and a second hinge position is further provided on the frame above the first hinge position; an adjustment block is hingedly connected to the second hinge position on the frame; a third hinge position is provided on the adjustment block, and the upper end of the shock absorber is hingedly connected to the third hinge position on the adjustment block;

[0010] When the adjusting block swings at the second hinge position, the fork swings at the first hinge position synchronously, thereby changing the angle between the fork and the frame;

[0011] The frame and the adjusting block are provided with mutually adapted positioning mechanisms, and the positioning mechanisms are used to fix the relative position of the adjusting block and the frame when the adjusting block swings forward and backward at the second hinged position.

[0012] To further improve the above technical solution, the positioning mechanism includes a bolt, and at least two adjustment holes are spaced apart on the adjustment block, and the straight-line distances from each adjustment hole to the second hinge position are equal. An adjustment hinge hole is provided on the frame, and when the adjustment block swings at the second hinge position to any adjustment hole that is coaxial with the adjustment hinge hole, the bolt passes through the adjustment hinge hole and the coaxial adjustment hole at the same time, thereby fixing the relative position of the adjustment block and the frame.

[0013] Optionally, the positioning mechanism includes a bolt, and at least two adjustment hinge holes are spaced apart on the frame, and the straight-line distances from each adjustment hinge hole to the second hinge position are equal. An adjustment hole is provided on the adjustment block, and when the adjustment block swings at the second hinge position until the adjustment hole is coaxial with any adjustment hinge hole, the bolt passes through the adjustment hole and the coaxial adjustment hinge hole at the same time, thereby fixing the relative position of the adjustment block and the frame.

[0014] Furthermore, the adjustment hinge hole is located above the second hinge position and the third hinge position.

[0015] Furthermore, the frame includes a vertical beam, a first hinge position is arranged at the lower part of the vertical beam, a second hinge position is arranged at the middle part of the vertical beam, the upper part of the vertical beam is fixedly connected with a seat cushion extending rearward, and an adjustment hinge hole is arranged on the seat cushion.

[0016] Further, the seat cushion has a hinged lug protruding downward, and the adjustment hinge hole is provided on the hinged lug;

[0017] The adjusting block is composed of two parallel and opposite pieces, the hinged lug is located between the two adjusting blocks, and the bolt passes through the hinged lug and the two adjusting blocks at the same time.

[0018] Optionally, the seat cushion has a hinged lug protruding downward, and the adjustment hinge hole is provided on the hinged lug;

[0019] There are two parallel and directly opposite hinged ears, the adjustment block is located between the two hinged ears, and the bolt passes through the adjustment block and the two hinged ears at the same time.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. In the seat height adjustment structure of the utility model, when the adjustment block swings at the second hinge position, the fork will synchronously swing at the first hinge position, thereby changing the angle between the fork and the frame; after adjustment, the adjustment block and the frame are fixed, the seat cushion is installed on the frame, the whole vehicle system rotates around the front wheel axle, and the rear wheel is on the ground, so the height of the seat on the frame is adjusted.

[0022] 2. The seat height adjustment structure of the utility model has little change to the basic structure of the vehicle parts and the whole vehicle, is simple and easy to operate, and the adjustment operation process is safe and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a seat height state of the seat height adjustment structure of the first embodiment;

[0024] Figure 2 It is a schematic diagram of another seat height state of the seat height adjustment structure of the first embodiment;

[0025] Figure 3 for Figure 1 and Figure 2 Comparison of frame fixation at two different seat heights;

[0026] Figure 4 For Figure 3 Based on the comparison diagram, the rear wheels in both states are placed on the horizontal ground;

[0027] Figure 5 For the main indication Figure 1 A partial schematic diagram of the relevant connections of the middle regulation block;

[0028] Figure 6 for Figure 5 Schematic diagram of the right side view (partial, mainly showing the connection between the hinged support ear and the adjustment block, and adding a diagram of the positioning mechanism pin);

[0029] Figure 7 It is a partial schematic diagram of a seat height state of the seat height adjustment structure of the second embodiment;

[0030] Figure 8 It is a partial schematic diagram of another seat height state of the seat height adjustment structure of the second embodiment;

[0031] Among them, the frame 1, the first hinge position 11, the second hinge position 12, the vertical beam 13, the seat cushion 14, the hinge support ear 141, the adjustment hinge hole 15, the flat fork 2, the rear wheel 21, the adjustment block 3, the adjustment hole 31, the third hinge position 33, the shock absorber 5, the positioning mechanism 6, and the bolt 61. DETAILED DESCRIPTION

[0032] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0033] Embodiment 1

[0034] See also Figure 1 The seat height adjustment structure of the first embodiment includes a shock absorber 5, the lower end of the shock absorber 5 is hingedly connected to the middle part of the flat fork 2, the front end of the flat fork 2 is hingedly connected to the first hinge position 11 on the frame 1, and the rear end of the flat fork 2 is used to connect the rear wheel 21. The frame 1 is also provided with a second hinge position 12 above the first hinge position 11; the second hinge position 12 on the frame 1 is hingedly connected with an adjustment block 3; the adjustment block 3 is provided with a third hinge position 33 behind the second hinge position 12, and the upper end of the shock absorber 5 is hingedly connected to the third hinge position 33 on the adjustment block 3; so that the flat fork 2, the frame 1, the adjustment block 3 and the shock absorber 5 form a four-bar mechanism.

[0035] Please see again Figure 2 and Figure 3 From a mechanical point of view, assuming that the frame 1 is fixed, when the adjustment block 3 swings with the second hinge position 12 as the rotation center, the fork 2 will synchronously swing with the first hinge position 11 as the rotation center, thereby changing the angle between the fork 2 and the frame 1. Figure 4 , the rear wheel 21 always contacts the ground, the whole vehicle system rotates around the front wheel shaft, and the rear wheel 21 touches the ground, thus realizing the lowering adjustment of the seat height position on the frame 1. Vice versa, after the adjusting block 3 swings in the opposite direction, the raising adjustment of the seat height position on the frame 1 can be realized.

[0036] Of course, each adjustment position of the adjustment block 3 relative to the frame 1 needs to be fixed. The frame 1 and the adjustment block 3 are provided with mutually adapted positioning mechanisms 6, which are used to fix the relative position of the adjustment block 3 with the frame 1 when it swings forward and backward at the second hinge position 12. After the relative position of the adjustment block 3 and the frame 1 is fixed, the aforementioned four-bar mechanism evolves into a triangular shock absorbing system to ensure the normal use of the whole vehicle after adjustment. During implementation, the shock absorber 5 is a common telescopic spring and / or cylinder shock absorber, and the specific morphology of the frame 1, the adjustment block 3, and the flat fork 2 is not limited, as long as the connection, movement and fixation of the aforementioned four-bar mechanism can be realized.

[0037] The seat height adjustment structure of the embodiment has little modification to the basic structure of the frame 1, the fork 2 and other parts and the whole vehicle, and only adds a swingable adjustment block 3. The positioning mechanism 6 can be selected to be in the form of a hinged connection with a commonly used bolt 61 and a socket, and the improved structure is simple and easy. During the adjustment process, even if the positioning mechanism 6 is disengaged, the upper end of the shock absorber 5 is still connected to the frame 1 through the adjustment block 3, so it is not easy for the whole vehicle to collapse, the process is safer, and the adjustment operation is more convenient.

[0038] As a mechanical common sense, it can be understood that the description of each hinged position or hinged connection should have a through hole for hinge connection on the two parts corresponding to each other. The hinge connection is implemented by coaxial assembly and using parts such as rotating shaft pins to pass through the two through holes. The hole and axis sizes should match each other, generally with a clearance fit that meets the requirements of movement. The axial directions of each hinged position hole are set parallel, specifically along the lateral direction of the vehicle.

[0039] Please see again Figure 5 , Figure 6 In this embodiment, the positioning mechanism 6 includes a bolt 61. At least two adjusting holes 31 are spaced apart on the adjusting block 3, two of which are shown in the figure. The straight-line (vertical) distance from the center of each adjusting hole 31 to the center of the second hinge position 12 is equal. An adjusting hinge hole 15 is provided on the frame 1. The straight-line distance from the center of the adjusting hinge hole 15 to the center of the second hinge position 12 is equal to the straight-line distance from the center of the adjusting hole 31 to the center of the second hinge position 12. When the adjusting block 3 swings with the second hinge position 12 to any adjusting hole 31 being coaxial with the adjusting hinge hole 15, the bolt 61 simultaneously passes through the adjusting hinge hole 15 and the coaxial adjusting hole 31, thereby fixing the relative position of the adjusting block 3 and the frame 1.

[0040] In this way, when adjustment is needed, the bolt 61 can be pulled out, which is easy to operate. To prevent the bolt 61 from coming out by itself, a nut or a horizontal latch is generally connected to the free end of the bolt 61, which is an existing method and will not be described in detail herein.

[0041] To facilitate spatial arrangement and make the shape of the adjustment block 3 simpler, specifically, the adjustment hinge hole 15 is located above the second hinge position 12 and the third hinge position 33. Of course, the description of "above" refers to the existence of a height difference in the vertical direction, and does not necessarily refer to the absolute vertical top. The frame 1 includes a vertical beam 13, a first hinge position 11 is provided at the lower part of the vertical beam 13, a second hinge position 12 is provided at the middle part of the vertical beam 13, a seat cushion 14 extending obliquely upward and rearward is fixedly connected to the upper part of the vertical beam 13, and the adjustment hinge hole 15 is provided on the seat cushion 14. During implementation, the seat cushion 14 can be formed by the upper end of the vertical beam 13 being bent backward and extended as a whole, or it can be welded and fixed to the upper end of the vertical beam 13.

[0042] The frame 1 (vertical beam 13), the seat cushion 14 and the fork 2 are usually bilaterally symmetrical structures, connected in the middle by multiple transverse connecting parts. The seat height adjustment structure can be provided with two sets of corresponding bilaterally symmetrical sets on the whole vehicle, or it can be connected through the middle of each transverse connecting part and arranged in the middle. For example, the seat cushion 14 includes symmetrical left and right support rods (not shown in the figure), and the left and right support rods are transversely fixedly connected by connecting ribs, and the middle of the connecting ribs has a downwardly protruding hinged support ear 141, which can be seen in FIG. Figure 6, the adjustment hinge hole 15 is provided on the hinge lug 141; the adjustment block 3 is two parallel and opposite pieces, a plate-like structure, the hinge lug 141 is located between the two adjustment blocks 3, and the bolt 61 passes through the hinge lug 141 and the two adjustment blocks 3 at the same time. It can be understood that the upper end of the shock absorber 5 is also located between the two adjustment blocks 3. In addition, the lower end of the shock absorber 5 and the flat fork 2, the frame 1 of the second hinge position 12 and the adjustment block 3 can also adopt a similar connection form; and the front end of the flat fork 2 and the frame 1 are mostly hinged to the left and right.

[0043] Embodiment 2

[0044] See also Figure 7 and Figure 8 , the difference between the second embodiment and the first embodiment is that the positioning mechanism is slightly different in form, and the positioning mechanism still uses a bolt (not shown in the figure). At least two adjustment hinge holes 15 are spaced apart on the hinged support ear 141 at the lower part of the seat cushion seat 14 on the frame 1, and two are shown in the figure. The straight-line distance from the center of each adjustment hinge hole 15 to the center of the second hinge position 12 is equal. There is only one adjustment hole 31 on the adjustment block 3, and the straight-line distance from the center of the adjustment hole 31 to the center of the second hinge position 12 is equal to the straight-line distance from the center of the adjustment hinge hole 15 to the center of the second hinge position 12. When the adjustment block 3 swings with the second hinge position 12 until the adjustment hole 31 is coaxial with any adjustment hinge hole 15, the bolt 61 simultaneously passes through the adjustment hole 31 and the coaxial adjustment hinge hole 15, so as to fix the relative position of the adjustment block 3 and the frame 1. However, in this scheme, the hinged support ear 141 is relatively large in size, and the frame weight may be greater.

[0045] In addition, the number of hinged ears 141 and adjustment blocks 3 can also be changed, for example, there are two parallel hinged ears 141, there is one adjustment block 3 and it is located between the two hinged ears 141, and the bolt passes through the adjustment block 3 and the two hinged ears 141 at the same time.

[0046] The aforementioned adjustment process and fixing of the adjusted state can also be realized.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A seat height adjustment structure, comprising a shock absorber, wherein the lower end of the shock absorber is hingedly connected to a flat fork, the front end of the flat fork is hingedly connected to a first hinge position on a frame, the rear end of the flat fork is used to connect to a rear wheel, and a second hinge position is provided on the frame above the first hinge position; characterized in that: The second hinge position on the frame is hinged with an adjustment block; the adjustment block is provided with a third hinge position, and the upper end of the shock absorber is hingedly connected to the third hinge position on the adjustment block; When the adjusting block swings at the second hinge position, the fork swings at the first hinge position synchronously, thereby changing the angle between the fork and the frame; The frame and the adjusting block are provided with mutually adapted positioning mechanisms, and the positioning mechanisms are used to fix the relative position of the adjusting block and the frame when the adjusting block swings forward and backward at the second hinged position.

2. The seat height adjustment structure according to claim 1, characterized in that: The positioning mechanism includes a bolt, and at least two adjustment holes are spaced apart on the adjustment block, and the straight-line distances from each adjustment hole to the second hinge position are equal. The frame is provided with an adjustment hinge hole. When the adjustment block swings at the second hinge position to any adjustment hole that is coaxial with the adjustment hinge hole, the bolt passes through the adjustment hinge hole and the coaxial adjustment hole at the same time, thereby fixing the relative position of the adjustment block and the frame.

3. The seat height adjustment structure according to claim 1, characterized in that: The positioning mechanism includes a bolt, and at least two adjustment hinge holes are spaced apart on the frame, and the straight-line distances from each adjustment hinge hole to the second hinge position are equal. An adjustment hole is provided on the adjustment block. When the adjustment block swings at the second hinge position until the adjustment hole is coaxial with any adjustment hinge hole, the bolt passes through the adjustment hole and the coaxial adjustment hinge hole at the same time, thereby fixing the relative position of the adjustment block and the frame.

4. The seat height adjustment structure according to claim 2 or 3, characterized in that: The adjusting hinge hole is located above the second hinge position and the third hinge position.

5. The seat height adjustment structure according to claim 4, characterized in that: The frame comprises a vertical beam, a first hinge position is arranged at the lower part of the vertical beam, a second hinge position is arranged at the middle part of the vertical beam, a seat cushion seat extending rearward is fixedly connected to the upper part of the vertical beam, and an adjusting hinge hole is arranged on the seat cushion seat.

6. The seat height adjustment structure according to claim 5, characterized in that: The seat cushion has a hinged lug protruding downward, and an adjustment hinge hole is arranged on the hinged lug; The adjusting block is composed of two parallel and opposite pieces, the hinged lug is located between the two adjusting blocks, and the bolt passes through the hinged lug and the two adjusting blocks at the same time.

7. The seat height adjustment structure according to claim 5, characterized in that: The seat cushion has a hinged support ear protruding downward, and an adjustment hinge hole is arranged on the hinged support ear; There are two parallel and directly opposite hinged ears, the adjustment block is located between the two hinged ears, and the bolt passes through the adjustment block and the two hinged ears at the same time.

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