JP3182896U - Rear wheel suspension mounting device for rear unicycle - Google Patents

Abstract

The present invention provides a rear wheel suspension mounting device for a motorcycle that can be retrofitted without difficulty to install a double suspension structure that can expect a clear improvement in rear wheel suspension performance into current models and used cars.
SOLUTION: A swing arm 5 rotatably supported on a vehicle body frame 1 with a rear wheel 4 rotatably supported and a shock absorber 13 installed over the vehicle body frame 1 are provided on the left and right sides of the rear wheel 4. The rear-wheel suspension mounting device A for motorcycles mounted on each can mount the shock absorber 13 or an alternative shock absorber 16 different from the shock absorber 13 on the left and right sides of the rear wheel 4 in a sideways posture or a posture close thereto. The left and right spring upper tools LB and the like that can be retrofitted by screwing on the vehicle body frame 1 and the left and right spring lower tools LS and the like that can be retrofitted by screwing on the swing arm 5 are preferably configured. .
[Selection] Figure 2

Description

  The present invention relates to a rear wheel suspension mounting device suitable for a rear unicycle such as a motorcycle or a front two-wheeled motor tricycle, and more specifically, supports a rear wheel rotatably and can swing with respect to a body frame. The present invention relates to a rear wheel suspension mounting device for a rear unicycle in which shock absorbers that are installed across a swing arm to be supported and a vehicle body frame are provided on the left and right sides of the rear wheel, respectively.

  First, as disclosed in Patent Document 1, a structure in which a shock absorber is provided on each of the left and right sides of the rear wheel, that is, the rear wheel suspension performance of a two-wheeled vehicle adopting a two-suspension (twin shock) structure can be clearly improved. A structure has been filed. As a summary, in a motorcycle equipped with shock absorbers on the left and right sides of the rear wheels, each shock absorber is in a recumbent posture or a super forward leaning posture in order to bring the front end of the shock absorber close to the swing arm fulcrum in the vertical direction. And the vehicle body frame. That is, the left and right shock absorbers are in a horizontal position, and the front end thereof is provided close to the oscillating arm fulcrum in the vertical direction, which is called a horizontal horizontal suspension structure.

  If it becomes possible to incorporate the two horizontal suspension structure into a commercial vehicle (including a used car) that has already been sold, it will be possible to improve the rear wheel suspension performance, which is not so good, and to improve user satisfaction. It is possible to improve the product value in secondhand sales, and it is predicted that it will be very favorable. The YOKOHAMA 2-suspension structure can be introduced smoothly, including the examination of the surrounding structure, if it is a model newly designed by a motorcycle manufacturer, etc., but whether it can be introduced to current models and used cars already on sale Is not certain.

  In other words, when the current two-wheel suspension structure can be applied without much change, the frame is cut or its layout is changed, or the exhaust pipe position and shape are changed. It may be possible with this. In other words, whether there is a strength member that can be installed to connect the shock absorber to the body frame and the swinging arm in a lying position, and if present, the strength is sufficient, whether there is a placement space, This is because it is necessary for each target model to examine whether it can be realized structurally, such as not disturbing.

Japanese Patent Laid-Open No. 10-081288

  The purpose of the present invention is a rear wheel suspension for rear unicycles that can be easily introduced into current models and used cars by adopting a double suspension structure that can clearly improve the rear wheel suspension performance through further ingenuity. It is in the point which develops and provides a mounting device.

According to the first aspect of the present invention, the rear wheel 4 is rotatably supported, and the swinging arm 5 supported so as to be swingable with respect to the body frame 1 and the body frame 1 is provided with a buffer. In the rear wheel suspension mounting device for a rear unicycle provided with the device 13 on each of the left and right sides of the rear wheel 4,
The state where the existing connecting portion 5c for connecting the shock absorber 13 or the alternative shock absorber 16 different from the shock absorber 13 to the shock absorber 13 in the swing arm 5 is also used as the swing arm side connecting portion. Thus, a left spring upper tool LB and a right spring upper tool RB that can be retrofitted to the vehicle body frame 1 so as to be able to be mounted on the left and right sides of the rear wheel 4 in a lying position or a position close to a lying position when viewed from the side. Comprising
The left spring upper tool LB includes a frame-side connecting portion 23 for connecting the shock absorber 13 or the alternative shock absorber 16, and uses screwed portions 1 a and 1 d equipped on the vehicle body frame 1. It has a mounting portion 66, 67 that can be attached to the left side of the body frame 1,
The right spring upper tool RB includes a frame side connecting portion 23 for connecting the shock absorber 13 or the alternative shock absorber 16 and also uses screwed portions 1a and 1d provided in the vehicle body frame 1. The vehicle body frame 1 is provided with attachment portions 66 and 67 that can be attached to the right side of the vehicle body frame 1.

The invention according to claim 2 supports the rear wheel 4 so as to be rotatable, and supports the swinging arm 5 supported so as to be swingable with respect to the body frame 1 and the body frame 1. In the rear wheel suspension mounting device for a rear unicycle provided with the device 13 on each of the left and right sides of the rear wheel 4,
The shock absorber 13 or an alternative shock absorber 16 different from the shock absorber 13 can be mounted on the vehicle body frame 1 so that it can be mounted on each of the left and right sides of the rear wheel 4 in a sideways posture or a posture close to a sideways posture in a side view. Left and right spring upper tools LB and RB that can be retrofitted and left and right spring lower tools LS and RS that can be retrofitted to the swing arm 5
The left spring upper tool LB includes a frame side connecting portion 23 for connecting the shock absorber 13 or the alternative shock absorber 16, and uses screwed portions 1a and 1d provided in the vehicle body frame 1. And has mounting portions 18a and 19a that can be attached to the left side of the body frame 1.
The right spring upper tool RB includes a frame-side connecting portion 23 for connecting the shock absorber 13 or the alternative shock absorber 16, and uses screwed portions 1 a and 1 d equipped on the vehicle body frame 1. And has mounting portions 28a and 29a that can be attached to the right side of the body frame 1.
The left unsprung tool LS includes a swing arm side connecting portion 35 for connecting the shock absorber 13 or the alternative shock absorber 16, and a screw provided on the left arm 5 L of the swing arm 5. It has attachment parts 59 and 33a that can be attached to the left arm 5L using the attachment parts 5d and 5c,
The right unsprung tool RS includes a swing arm side connecting portion 43 for connecting the shock absorber 13 or the alternative shock absorber 16, and a screw provided in the right arm 5 </ b> R of the swing arm 5. It is characterized by having attachment portions 42 and 41 that can be attached to the right arm 5R using the attachment portions 5e and 5c.

The invention according to claim 3 is the rear wheel suspension mounting device for a rear unicycle according to claim 2, wherein the mounting portions 33a and 59 of the left unsprung tool LS connect the shock absorber 13 to the swing arm. In order to allow the fitting hole 33a and / or the chain case 34 to be inserted and screwed into the support shaft 5e mounted on the left arm 5L, to be fastened together with the bolt 50 attached to the swing arm 5. It consists of an insertion hole 59,
The fitting portions 41 and 42 of the right unsprung tool RS are inserted into and screwed into a support shaft 5e provided on the right arm 5R to connect the shock absorber 13 to the swing arm 5. A mounting hole 42 for fitting the mounting shaft 41 and / or the front end portion of the torque link 54 to the support shaft portion 5e mounted on the right arm 5R to support the right arm 5R. It is.

The invention according to claim 4 is the rear wheel suspension mounting device for a rear unicycle according to any one of claims 1 to 3, wherein the mounting portions 19a, 18a of the left spring upper tool LB are the swing arm. A through hole 19a for fastening together with a support shaft 14 supported on the vehicle body frame 1 and / or a bolt hole 18a for fastening together with an engine suspension bolt 20.
The attachment portions 29a and 28a of the right spring upper tool RB are shared by a through hole 29a for fixing the swing arm 5 together with a support shaft 14 supported on the body frame 1 and / or an engine suspension bolt 20. This is a bolt hole 28a for tightening and fixing.

  According to the first aspect of the present invention, although described in detail in the section of the embodiment, the two-sided suspension structure in which the connecting portion of the shock absorber in the swing arm is also used as the shock absorber swing arm side connecting portion is provided. The left and right sprung tools to be taken can be attached to the vehicle body frame using the screwed portions provided on the vehicle body frame. In other words, a large-scale remodeling method such as welding a stay for attaching a sprung tool to the vehicle body frame is a complicated and time-consuming remodeling that requires disassembly and repainting of the vehicle body, and requires a very high cost. However, the invention of claim 1 using the existing threaded portion does not have such inconvenience, and therefore it is possible to retrofit the left and right spring upper tools with a simple structure and at low cost. In addition, since the screwing portion is used, there is the convenience that the sprung tool can be attached and detached. As a result, with a further ingenuity, the two-side suspension structure that can clearly improve the suspension performance of the rear wheels can be configured with left and right spring tops, which can be easily introduced into current models and used cars. A rear wheel suspension mounting device for a rear unicycle can be provided.

  According to the second aspect of the present invention, the left and right spring upper tools for adopting the two-sided horizontal suspension structure that does not serve as the coupling portion of the shock absorber in the swing arm, as will be described in detail in the section of the embodiment. The left and right unsprung tools can be attached to the vehicle body frame and the swing arm using the screwed portions provided on the vehicle body frame and the swing arm. In other words, in the means of making large-scale modifications such as welding the stays for attaching the sprung or unsprung tools to the body frame or the swinging arm, it is a troublesome and time-consuming modification and repainting of the body. However, the invention of claim 2 using the existing threaded portion does not have such inconvenience, so that the right and left spring upper and lower springs can be retrofitted with a simple structure and low cost. It becomes possible to do. In addition, since the threaded portion is used, there is the convenience that the sprung tool and the unsprung tool can be attached and detached. As a result, with a further ingenuity, it is possible to construct a two-sided suspension structure that can clearly improve the suspension performance of the rear wheel with left and right spring top tools and left and right spring bottom tools. It is possible to provide a rear wheel suspension mounting device for a rear unicycle that can be performed.

  According to the invention of claim 3, the attachment portion of the left unsprung tool is constituted by an insertion hole inserted into the support shaft for connecting the shock absorber and an insertion hole for fastening together with a chain case mounting bolt. The mounting portion of the right unsprung tool can be constituted by a fitting hole inserted into the support shaft for connecting the shock absorber or a mounting hole for fitting into the support shaft portion for torque link support. . In other words, by using the various screwing parts originally provided on the swing arm, mounting parts suitable for these screwing parts are provided on the unsprung parts, and a more rational rear wheel suspension for the rear unicycle is provided. It can be a mounting device.

  According to the invention of claim 4, the mounting portion of the left spring upper tool is constituted by a through hole for fastening together with the swing arm support shaft and a bolt hole for fastening together with the engine suspension bolt. The attachment portion of the right spring upper tool can be constituted by a through hole for fastening together with a support shaft for swing arm support, or a bolt hole for fastening together with an engine suspension bolt. In other words, using various screwed parts originally installed on the body frame, the mounting parts suitable for these screwed parts are provided on the spring upper tool, and a more rational rear wheel suspension mounting for the rear unicycle. It can be a device.

The entire motorcycle with standard specifications is shown, (a) is a left side view, and (b) is a right side view. Left side view of the main part showing the left part of the rear wheel suspension mounting device Right side view of the main part showing the right part of the rear wheel suspension mounting device The left spring upper tool is shown, (a) is a rear view, (b) is a left side view. The right spring upper tool is shown, (a) is a plan view, (b) is a right side view. The left unsprung tool is shown, (a) is a rear view, and (b) is a left side view. The right unsprung tool is shown, (a) is a right side view, (b) is a front view. The cross section of the engine suspension is shown, (a) is a standard specification, (b) is a special specification Sectional view of swing arm support is shown, (a) is a standard specification, (b) is a special specification The front side mounting structure of the left and right spring lower tool is shown. The rear mounting structure of the left and right unsprung tool is shown, (a) is a cross-sectional view of the main part of one side of the standard specification, (b) is a cross-sectional view of the main part of the special specification The rear-wheel suspension mounting apparatus of another structure is shown, (a) is a left side view, (b) is a right side view. The rear-wheel suspension mounting apparatus in another model is shown, (a) is a left side view, and (b) is a right side view.

  Hereinafter, an embodiment of a rear wheel suspension mounting device for a rear unicycle according to the present invention (hereinafter abbreviated as “rear wheel suspension mounting device”) will be described with reference to the drawings. Examples 1 to 3 all show a rear-wheel suspension mounting device for a motorcycle, but the front two-wheel tricycle has one rear wheel, or the front wheel has three or more front wheels and one rear wheel. In short, the present invention can be applied to a single rear wheel, and these are collectively defined as a “rear unicycle”. In addition, a shock absorber that is a cushion unit for suspension of the rear wheel that is originally installed in the rear unicycle will be abbreviated as “CU” below.

  FIG. 1 shows a motorcycle (an example of a rear unicycle) to which the rear wheel suspension mounting apparatus A according to the first embodiment is applied. The vehicle body frame 1 and front wheels 2 are made of sheet metal and have a substantially T-shape in a side view. A front fork 3 for supporting the suspension, a swing arm 5 for rotatably supporting the rear wheel 4, an engine 6 with a transmission case 6M, a fuel tank 7, a seat 8, a rear fender 9, a muffler (exhaust pipe) 10, a step 11, The steering handle 12 and CUs (buffers) 13 provided on the left and right sides of the rear wheel 4 are provided. By using the rear wheel suspension mounting device A, as shown in FIGS. 1A and 1B, it is possible to equip an alternative shock absorber 16 in a lying position shown by phantom lines in place of the left and right CUs 13. The alternative shock absorber 16 (different specification) different from the CU 13 has a known structure including a coil spring and a damper, but may have other structures.

  The left and right CUs 13 are laid across the frame rear part, which is the lower side of the seat 8 in the body frame 1, and the rear end plate part (rear end part) 5 b of the swing arm 5. Equipped with posture. The swing arm 5 has a substantially H shape in a plan view, and a support shaft 14 inserted through the three members 5a, 1 and 5a in a state where the left and right pivot portions 5a and 5a sandwich the vehicle body frame 1 therebetween. The shaft is supported on the body frame 1 so as to be swingable up and down. Further, the rear wheel 4 disposed between the left and right rear end plate portions 5b and 5b of the swing arm 5 is rotated by a rear shaft 15 which is a support shaft inserted through the three members 5b, 4 and 5b. Supported as possible.

  As shown in FIGS. 2 and 3, the rear-wheel suspension mounting device A according to the first embodiment supports a rear wheel 4 so as to be rotatable and is supported so as to be swingable with respect to the vehicle body frame 1. 5 is a rear-wheel suspension mounting device A for a motorcycle in which CUs 13 extending between the vehicle body 5 and the vehicle body frame 1 are provided on the left and right sides of the rear wheel 4, respectively. That is, the rear-wheel suspension mounting device A can mount a pair of alternative shock absorbers 16 other than the removed CU 13 on the left and right sides of the rear wheel 4 in a sideways posture or a forward leaning posture close to a side-boiling posture. Therefore, it has a left spring upper tool LB, a right spring upper tool RB, a left spring lower tool LS, a right spring lower tool RS, and a connecting pipe 17 (see FIG. 4) that can be retrofitted. Configured.

  As shown in FIG. 4, the left spring upper tool LB includes a front arm portion 18 having a front hole (an example of a mounting portion and a bolt hole) 18 a for passing the engine suspension bolt 20 (see FIG. 8), and a support shaft. 14 is provided with a lower arm portion 19 provided with a lower hole (an example of an attachment portion and a through hole) 19a for passing through 14 and an upper arm portion provided with an upper hole 22a for inserting a connecting bolt 21 (see FIGS. 2, 3 and 4). 22 and a boss part (an example of a frame side connecting part) 23 into which a supporting means (rubber bush, spherical bearing, etc.) 24 is press-fitted. The support means 24 is a member for bolting the front mounting portion 16A of the alternative shock absorber 16 (see FIG. 5A). In this example, the main steel plate 25, the reinforcing steel plate 26, and the boss portion 23 that is a cylindrical member are integrated by welding. A rubber bush 24 having a known structure including a metal inner cylinder, a metal outer cylinder, and a rubber layer interposed therebetween is press-fitted to the cylindrical boss portion 23. C is the center of the vehicle body in the left-right direction.

  As shown in FIG. 5, the right spring upper tool RB includes a front arm portion 28 including a front hole (an example of an attachment portion and a bolt hole) 28 a for passing the engine suspension bolt 20 (see FIG. 8), and a support shaft. 14 is provided with a lower arm portion 29 provided with a lower hole (an example of an attachment portion and a through hole) 29a for passing through 14 and an upper arm portion 30 provided with an upper hole 30a through which the connecting bolt 21 (see FIGS. 2, 3 and 4) is passed. And a boss portion (an example of a frame side connecting portion) 23 into which the support means 24 is press-fitted. The support means 24 is a member for bolting the front mounting portion 16A of the alternative shock absorber 16 (see FIG. 5A). In this example, a cylindrical spacer 27 arranged at the front end of the front arm portion 28, and four members of a main steel plate 31, a reinforcing steel plate 32, and a boss portion 23 are integrated by welding. The rubber bush 24 is press-fitted and attached to the boss portion 23.

  As shown in FIG. 6, the left unsprung tool LS is a part that is bolted to the left arm 5 </ b> L of the swing arm 5, and includes a support shaft (an example of an existing connecting portion and a screwed portion) 5 c for attaching the CU 13. A rear hole (an example of an attachment portion and a fitting hole) 33a for passing through and a bolt 50 for attaching the front side portion of the chain case 34 to a front stay (an example of a screwing portion) 5d fixed to the left arm 5L. Metal having a front hole (an example of an attachment portion and an insertion hole) 59 for fastening, and a connection portion (an example of a swing arm side connection portion) 35 for bolt-connecting the rear attachment portion 16B of the alternative shock absorber 16 It is made of. In this example, a main plate 39 having a plurality of mitigating holes 36, a reinforcing plate 38 having a rear hole 33a, and a cylindrical boss 33 having a rear hole 33a are welded and integrated, and a main body 39 and two front and rear thereof. The left unsprung tool LS is composed of the connecting portion 35 attached using the bolts 40, 40.

  In the main body 39, holes 39a for screwing the connecting portion 35 with the two bolts 40, 40 are formed in a total of four places along the front and rear, and in FIG. And the state screwed using the 3rd 3rd hole from the front is drawn. The connecting portion 35 includes a connecting main plate 35a, a bent main plate 35b, a washer plate 35c, and the like. Although illustration is omitted, a state in which the connecting portion 35 is attached to the main body portion 39 using the second second hole and the last fourth hole from the front is also possible. With this structure in which the front and rear parts can be alternately replaced, it is possible to mount the alternative shock absorber 16 corresponding to different lengths.

  As shown in FIG. 7, the right unsprung tool RS is a part that is bolted on to the right arm 5 </ b> R of the swing arm 5, and includes a support shaft (an example of an existing connecting portion and a screwed portion) 5 c for attaching the CU 13. A pair of front and rear rear holes 41, 41 for passing through and a support shaft portion (an example of a screwed portion) 5e fixed to the right arm 5R to engage and support the front portion of the torque link 54 (see FIG. 3). And a connecting portion (an example of a swinging arm side connecting portion) 43 for connecting the rear mounting portion 16B of the alternative shock absorber 16 with a bolt. In this example, a body portion 45 having a pair of rear holes 41 and 41, a connecting portion 43 and a reduction hole 44, and a leg portion 46 having a front hole 42 are screwed together by two bolts and nuts 47 and 47 at the front and rear. Thus, the right unsprung tool RS is configured.

  The main body 45 is formed by welding and integrating a block piece 45A including a pair of rear holes 41, 41, a main steel plate 45B, a bent steel plate 45C serving as a U-shaped connecting portion 43, and a reinforcing plate 45D. . The leg portion 46 is screwed to the main leg plate 46A by a pair of front and rear small bolts 49, 49 having a main leg plate 46A having three support holes 48 and a large front hole 42A arranged in the front-rear direction and a small front hole 42B. And the secondary leg plate 46B. The large front hole 42A and the small front hole 42B having a smaller diameter are elongated holes that are long in the front and rear directions and have the same axial center, and the front hole 42 is formed by these both 42A and 42B.

  The front and rear spans of the pair of front and rear rear holes 41 and 41 and the front and rear spans of adjacent ones of the three front and rear support holes 48 have the same value, and the “front and rear two” of the left spring lower tool LS. The front and rear spans in the “placeable alternation structure” are set to the same value. Therefore, when using the front support holes 48 and the rear rear holes 41 (see FIGS. 3 and 7), the length of the support holes 48 and the front rear holes 41 are two. It is configured to be switchable when a slightly longer alternative shock absorber 16 is provided.

  Next, instead of the standard specification (normal rear wheel suspension specification: see FIG. 1) that equips a pair of CUs 13 in a vertical orientation, a special specification (a double-side suspension structure with a pair of alternative shock absorbers 16) The structure, work procedure, etc. of the rear wheel suspension mounting device A to be switched to will be described.

  First, the left spring upper tool LB and the right spring upper tool RB both have an engine suspension bolt 20 for screwing and fixing the engine 6 to the vehicle body frame 1 and the vehicle arm frame 1 so that the swing arm 5 can swing up and down. It is fixedly attached to the vehicle body frame 1 by a co-fastening structure using a support shaft 14 for supporting. In this case, since the original engine suspension bolt 20 and the support shaft 14 are insufficient in length, the extension suspension bolt 20E and the extension support shaft 14E each having a length increased by a predetermined amount are newly used. That is, by removing the support shaft 14 and the engine suspension bolt 20 in the standard specification, and using the extension support shaft 14E and the extension suspension bolt 20E instead, the left and right spring upper tools LB as shown in FIGS. , RB can be attached to the vehicle body frame 1 together.

  With respect to the engine suspension bolt 20, in the standard specification, as shown in FIG. 8A, a mounting bracket 6m protruding upward from the transmission case 6M is interposed between the left and right vertical side walls 1b and 1c constituting the vehicle body frame 1. The left side wall hole (an example of a screwed portion) 1B of the left vertical side wall 1b, the mounting bracket 6m, and the right side wall hole (an example of a screwed portion) 1C of the right vertical side wall 1c are suspended from the left to the right. The bolt 14 is fastened and fixed with a long nut 52. At the opposite side (right side) end of the long nut 52, an intermediate stay 10 a that fixes the front and rear intermediate portions of the muffler 10 is fastened with bolts 64. That is, the long nut 52 for the engine suspension bolt 20 also serves as a screwing means for attaching the muffler 10 to the vehicle body frame 1.

  In the special specification, as shown in FIG. 8B, the left spring upper tool LB is positioned on the left side of the left vertical side wall 1b, and the right spring upper tool RB is positioned on the right side of the right vertical side wall 1b. The extended suspension bolt 20E is passed through the front hole 28a, the right side wall hole 1C, the mounting bracket 6m, the left side wall hole 1B, and the front hole 18a, and tightened with a nut on the left side of the vehicle body frame 1. As a result, the front arm portion 18 of the left spring upper tool LB and the front arm portion 28 of the right spring upper tool RB are fixed to the vehicle body frame 1 together with the mounting bracket 6m by the extension suspension bolt 20E. The aforementioned intermediate stay 10a is fixed to the vehicle body frame 1 via the extended suspension bolt 20E by a bolt 53 that is screwed onto the bolt head 20e of the extended suspension bolt 20E.

  With respect to the support shaft 14, in the standard specification, as shown in FIG. 9A, the bearing tool 51 fitted in the front end portion of each arm 5 </ b> R, 5 </ b> L has an inner cylinder 51 a that is a support cylinder (a screwed portion). An example) The vehicle body frame 1 is sandwiched between the left and right sides of 1a, and the swing arm 5 is swung up and down by tightening the nuts of the support shaft 14 passed through the left and right inner cylinders 51a and the support cylinder 1a. It is a structure that is supported by the body frame 1 so as to be movable. The bearing tool 51 has a known structure including an outer cylinder 51b press-fitted into the arms 5R and 5L, an inner cylinder 51a, and a bush material (rubber or the like) 51c interposed therebetween. .

  In the special specification, as shown in FIG. 9B, the left spring upper tool LB is positioned on the left side of the left bearing tool 51, and the right spring upper tool RB is positioned on the right side of the right bearing tool 51. In this state, instead of the support shaft 14, the extended support shaft 14E is passed through the lower hole 19a, the inner cylinder 51a, the support cylinder 1a, the inner cylinder 51a, and the lower hole 29a and tightened with a nut. As a result, the lower arm portion 19 of the left spring upper tool LB and the lower arm portion 29 of the right spring upper tool RB are fixed to the vehicle body frame 1 in a state of being fastened together with the left and right bearing tools 51 by the extension support shaft 14E.

  The left and right unsprung tools LS and RS will be described. With respect to the front portion of the swing arm 5, in the standard specification, as shown in FIG. 10A, on the left side, the front mounting piece 34 a of the chain case 34 is bolted to the front stay 5 d of the left arm 5 L. Tightened and fixed. On the right side, the front end portion of the torque link 54 is inserted into the support shaft portion 5e fixed to the right arm 5R, and is prevented from being detached by the flat washer 55 and the nut 56, and is fitted to the support shaft portion 5e. The coil spring 57 is pressed and biased toward the flat washer 55 side.

  In the special specification, as shown in FIG. 10B, on the left side, an extension bolt 50E having a longer length is used instead of the bolt 50, and the front end of the left unsprung tool LS is attached to the front mounting piece 34a. The front end portion of the left unsprung tool LS is attached to the left arm 5L by passing through the front hole 59 and being fastened to the front stay 5d in a co-tightened state positioned on the left side. On the right side, the large front hole 42A is fitted to the support shaft 5e from which the coil spring 57 has been removed while the torque link 54 is pushed inward, and the small front hole 42B is fitted to the small diameter male screw portion (not shown). By fixing the secondary leg plate 46B with a nut, the leg portion 46 is fitted and fixed to the support shaft portion 5e. As indicated by phantom lines, an elastic washer 58 such as rubber may be fitted to the support shaft portion 5e in place of the coil spring 57 in order to restrict the swing movement of the torque link 54.

  With respect to the rear portion of the swing arm 5, in the standard specification, as shown in FIG. 11A, on the left side, a CU13 is attached to a cantilevered support shaft 5c penetratingly fixed to the rear end plate portion 5b of the left arm 5L. The lower end mounting portion 13a is fitted and nut-tightened. The right arm 5R on the right side has the same structure and is substituted in FIG.

  In the special specification, as shown in FIG. 11B, on the left side, a rear hole 33a is inserted into the support shaft 5c from which the CU 13 has been removed, and the cylindrical boss 33 is tightened with a nut. The end is attached to the left arm 5L. On the right side, the rear end portion of the right spring lower tool RS is attached to the right arm 5L by inserting the rear hole 41 into the support shaft 5c removed from the CU 13 and tightening the main steel plate 45B and the lock piece 45A with nuts.

  2 and 3, in the mounted state of the rear wheel suspension mounting device A, as shown in FIG. 4A, the upper arm portion 22 of the left spring upper tool LB and the upper arm portion 30 of the right spring upper tool RB. Are connected and integrated by tightening the connecting bolt 21 using a connecting pipe 17 interposed between the left and right. The structure for connecting the left and right upper arm portions 22 and 30 reinforces the support strength of the left and right spring upper tools LB and RB to the vehicle body frame 1, and the connection pipe 17 is connected to the vehicle body frame 1 and the rear fender 9. It is arranged through the space S that exists between the front and rear without any difficulty. The connection structure (connection pipe and bolts 17 and 21) can be omitted.

  As shown in FIGS. 2 and 4, the left spring upper tool LB is detachably attached to the left side wall 1b of the front arm 18 and the upper side so as to avoid buffering with the lid cover 62 protruding leftward. The arm portion 22 is set in shape. As shown in FIG. 4 (a), the lower arm portion 19 of the left spring upper tool LB extends outward to the left to avoid interference with the rear upper portion of the left cover (chain cover) 6R attached to the transmission case 6M. It is preferable to form a detoured shape that curves. As shown in FIGS. 3 and 5, the right spring upper tool RB includes the front arm portion 28 and the upper arm portion so as to avoid buffering between the bulging portion 63 protruding rightward from the frame right side wall 1c and the transmission case 6M. 30 is set.

  As shown in FIG. 3, the right spring upper tool RB and the front end portion of the right alternative shock absorber 16 are disposed so as to be fitted into a narrow space portion between the left and right of the vehicle body frame 1 and the muffler 10. If the alternative shock absorber 16 or its mounting bolts and nuts interfere with the muffler 10 due to dimensional errors or product errors, etc., handle the inner part of the muffler 1 by moving it slightly to the right and deforming it. Can do.

  The left unsprung tool LS is, as shown in FIGS. 2 and 6, basically screwed to the left arm 5 </ b> L on the left side of the chain case 34 and is attached to the chain case 34 that covers the chain 65. Avoidance holes 61 for preventing interference with the two bolts 60, 60 for attaching the piece 34b to the left arm 5L are formed in two locations correspondingly. Further, in order to prevent the alternative shock absorber 16 from projecting to the left and right outside as much as possible in the left-right direction, the connecting portion 35 is placed on the right side with respect to the main body portion 39 so that the connecting portion 35 is disposed on the chain case 34. The structure is such that the bolt is connected to the offset. In addition, when the length of the alternative shock absorber 16 is fixed to one type, the left-side spring lower tool LS having a structure in which the main body 39 and the connecting portion 35 are integrated so as not to be separated by welding or the like may be used. good.

  In the first embodiment, the front part of the left spring lower tool LS is connected to the left arm 5L by a joint tightening structure using the front mounting part (front stay 5d) of the chain case 34, and the right spring lower tool RS The front portions are respectively fixed to the right arm 5R by screwing using the attachment portion (support shaft portion 5e) of the torque link 54. On the other hand, when there is no suitable attachment means such as screwing on the swing arm 5, illustration is omitted, but the arms 5 L and 5 R are attached to the front portions of the unsprung tools LS and RS. It is good also as a structure which provides the site | part which can be pressed and hold | maintained from between, and clamps and fixes each arm 5L and 5R directly.

  The rear-wheel suspension mounting device A according to the first embodiment includes left and right spring upper tools LB and RB, left and right spring lower tools LS and RS, a connection pipe 17, a connection bolt 21, an extension support shaft 14E, an extension suspension bolt 20E, and an extension bolt. 50E and the muffler 10 bolt 53. Therefore, by changing the support shaft 14 to the extension support shaft 14E, the engine suspension bolt 20 to the extension suspension bolt 20E, and the front mounting bolt 50 of the chain case 34 to the extension bolt 50E, the rear wheel in the original motorcycle is changed. While maintaining the state other than the suspension structure, it can be changed to a special specification (Yokohama two-suspension suspension structure) excellent in rear wheel suspension performance.

  For example, in order to make a special specification, it is necessary to remove the chain case or to attach the mounting brackets to the swing arm 5 without the need for troublesome modifications. The rear-wheel suspension mounting device A with a convenient retrofit kit part structure that can also be realized. That is, the left and right sprung tools LB and RB and the left and right unsprung tools LS and RS, which are the main parts, are all configured to be mounted using existing screwing means and their mounting parts. Therefore, it is possible to return to the original standard specification using the pair of CUs 13 and 13 by performing the work reverse to the work at the time of assembly, and the appearance at that time also returns to the original state.

  In the first embodiment, as the alternative shock absorber 16, the front mounting portion 16 </ b> A is a bifurcated plate having a U-shape, and the rear mounting portion 16 </ b> B is a pivotal support portion in which a shaft support bush (not shown) is fitted. However, both ends have a pivotal support structure, both ends have a bifurcated plate structure, or the front mounting part 16A has a pivotal support structure and the rear mounting part 16B has a bifurcated structure. Various types of shock absorbers are possible, such as those having a plate structure. Therefore, the structure of the portion connecting the shock absorbers in the left and right spring upper tools LB and RB and the left and right unsprung tools LS and RS can be changed correspondingly.

  As shown in FIG. 12, a rear-wheel suspension mounting device A that also serves as the support shaft 5c of the swing arm 5 may be used. That is, the support shaft 5c, which is a portion connecting the lower part of the CU 13 in the swing arm 5, is used as a shaft for fitting the rear mounting portion 16B of the alternative shock absorber 16, that is, the swing arm side connection portion. In this case, the rear wheel suspension mounting device A is composed of mainly two parts, the left and right spring upper tools LB and RB. In FIGS. 12A and 12B according to the second embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals and the description thereof is made.

  The left spring upper tool LB and the right spring upper tool RB support the front mounting portion 16A of the alternative shock absorber 16 as shown in FIGS. 12 (a) and 12 (b), respectively, and the extended support shaft 14E. And the extension suspension bolt 20E. The means for interconnecting the left and right sprung tools LB and RB, such as the connecting pipe 17 of the first embodiment, is omitted. In the motorcycle according to the second embodiment, as shown in FIG. 12 (a), the step 11 is arranged at some distance forward from the extended support shaft 14E that is the swinging support shaft of the swinging arm 5. Similar to the CU 13 indicated by the broken line, the left-side alternative shock absorber 16 that projects from the left outer side of the chain case 34 does not interfere with the rider's body (leg) such as calves. If the support shaft 5c of the swing arm 5 is also used as the swing arm side connecting portion in this way, the rear wheel suspension mounting is simpler and less expensive with a smaller number of parts than in the first embodiment. Device A can be provided.

  The rear wheel suspension mounting device A of the first embodiment has an advantage that the left-side alternative shock absorber 16 is disposed on the chain case 34 and the overhang to the left is suppressed. Therefore, as shown by the phantom line in FIG. 12A, the left spring lower tool LS is detachably attached using, for example, an extension bolt 50E that is fastened together with the front portion of the chain case 34. It is also possible to adopt a configuration in which the alternative shock absorber 16 is provided on the chain case 34 in order to suppress overhang. Then, as indicated by phantom lines in FIG. 12 (b), a right unsprung tool RS is further added and the right alternative shock absorber 16 is lifted upward, and the arrangement state in the side view is the left alternative shock absorber. It may be the same as the vessel 16. In this case, it is possible to adopt a structure in which the front part of the right unsprung tool RS is pressure-bonded and fixed by bolting with the right arm 5R held.

  As shown in FIG. 13, the left and right springs are structured to be installed and installed across a mounting shaft (an example of a screwed portion) 1 d for connecting the upper portion of the CU 13 to the vehicle body frame 1 and a support shaft 14 of the swing arm. A rear-wheel suspension mounting device A having the upper tools LB and RB and also having the support shaft 5c of the swing arm 5 may be used. That is, the left and right sprung tools LB and RB are mounted on the vehicle body frame 1 in a laterally protruding state under the seat 8, as indicated by phantom lines in FIGS. 13 (a) and 13 (b). An upper hole (an example of an attachment portion) 66 fitted to the attachment shaft 1d, and a lower hole (an example of an attachment portion) fitted to the support cylinder (an example of a screwed portion) 1a via the support shaft 14 (14E). ) 67 and a frame-side connecting portion 23 that connects the CU 13 to a vertically middle portion slightly below. In FIGS. 13A and 13B according to the third embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals and the description thereof is made.

  Now, the procedure for switching from the standard specification to the special specification in the motorcycle shown in the third embodiment will be described with reference to FIG. 13 (a) for the left side and FIG. 13 (b) for the right side. That is, on both the left and right sides of the rear wheel 4, the CU 13 indicated by the solid line is removed from the mounting shaft 1 d, and the left side extends across the mounting shaft 1 d from which the CU 13 is removed and the extended support shaft 14 E replaced from the support shaft 14. The spring top tool LB and the right spring top tool RB are fitted and attached. Then, the upper mounting portion (not shown) is connected to the frame side connecting portion 23 by, for example, moving the CU 13 forward and swinging around the support shaft 5c.

  In the motorcycle shown in FIG. 13, the rear end portion 5b of the swing arm 5 is formed in a shape that can be lifted upward, and the support shaft 5c is originally positioned above the full-cover type chain case 34. Is configured to do. Therefore, even if the CU 13 and the support shaft 5c, which are originally equipped with the shock absorber, are combined, “the shock absorber 13 is placed on the vehicle body frame 1 and the swing arm 5 in a state of being placed on the side of the chain case 34. It is possible to adopt a configuration of “over erection”. If the standard specification CU 13 is shared by the special specification, the alternative shock absorber 16 can be used if the suspension stroke of the rear shaft 15, that is, the rear wheel 4, becomes too large or the spring constant becomes too low. It may be used.

  In the rear-wheel suspension mounting device A according to the third embodiment, the support shaft 5c of the swing arm 5 and the mounting shaft 1d of the vehicle body frame 1 can be used together, and the left and right unsprung tools and the extension suspension bolts can be omitted. Compared to the case of the second embodiment, the number of parts is reduced, and there is an advantage that the rear wheel suspension mounting device A can be provided with a simpler structure and at a lower cost.

[Another Example]
“Screwed portion mounted on the vehicle body frame” means that it can be attached using screwing means such as bolts, and the support cylinder 1a through which the support shafts 14 and 14E are passed, the engine suspension bolts 20, In addition to the left and right side wall holes 1B, 1C through which 20E is passed, a pipe-shaped portion (eg, a right arm and a vehicle body frame that can be fastened by surrounding a female screw portion, a male screw portion, or a member) Pipe material), various holes such as holes through which bolts to be tightened can be inserted are possible. Further, as in the right unsprung tool RS shown by phantom lines in FIG. 12B, the unsprung tool having a structure in which only one screwed part is attached to the swing arm 1 and one screwed part to the vehicle body frame. It is also possible to use a sprung tool having a structure only having the above.

DESCRIPTION OF SYMBOLS 1 Body frame 1a, 1d Screwing part 4 Rear wheel 5 Swing arm 5L Left arm 5R Right arm 5c Existing connection part, Screwing part 5d Screwing part 5e Screwing part, Bearing shaft 13 Buffer 14 Support shaft 16 Alternative buffer 18a mounting portion, bolt hole 19a mounting portion, through hole 20 engine suspension bolt 23 frame side connecting portion 66, 67 mounting portion 28a mounting portion, bolt hole 29a mounting portion, through hole 35 swing arm side connecting portion 33a mounting Part, fitting hole 34 chain case 41 attaching part, fitting hole 42 attaching part, attaching hole 43 swing arm side connecting part 50 bolt 54 torque link 59 attaching part, insertion hole A rear wheel suspension attaching device LB left spring upper tool RB Right spring upper tool LS Left spring lower tool RS Right spring lower tool

Claims (4)

A swing arm that rotatably supports the rear wheel and is supported so as to be swingable with respect to the vehicle body frame, and a shock absorber installed across the vehicle body frame are provided on each of the left and right sides of the rear wheel. A rear wheel suspension mounting device for a rear unicycle,
The shock absorber or an alternative shock absorber different from the shock absorber is lying in a side view in a state where an existing connecting portion for connecting the shock absorber in the swing arm is also used as the swing arm side connecting portion. A left spring upper tool and a right spring upper tool that can be retrofitted to the vehicle body frame in order to be able to be mounted on each of the left and right of the rear wheel in a posture close to a posture or a recumbent posture,
The left spring upper tool includes a frame side connecting portion for connecting the shock absorber or the alternative shock absorber, and is attached to the left side of the vehicle body frame using a screwing portion provided in the vehicle body frame. Configured with possible attachments,
The right spring upper tool includes a frame side connecting portion for connecting the shock absorber or the alternative shock absorber, and is attached to the right side of the vehicle body frame using a screwed portion provided in the vehicle body frame. A rear-wheel suspension mounting device for a rear unicycle configured with a possible mounting portion. A swing arm that rotatably supports the rear wheel and is supported so as to be swingable with respect to the vehicle body frame, and a shock absorber installed across the vehicle body frame are provided on each of the left and right sides of the rear wheel. A rear wheel suspension mounting device for a rear unicycle,
The vehicle body frame can be retrofitted so that the shock absorber or an alternative shock absorber different from the shock absorber can be mounted on each of the left and right sides of the rear wheel in a lateral position or a position close to a horizontal position in a side view. Comprising left and right spring top tools and left and right spring unstool that can be retrofitted to the swing arm;
The left spring upper tool includes a frame side connecting portion for connecting the shock absorber or the alternative shock absorber, and is attached to the left side of the vehicle body frame using a screwing portion provided on the vehicle body frame. It has a mounting part that can be worn,
The right spring upper tool includes a frame side connecting portion for connecting the shock absorber or the alternative shock absorber, and is attached to the right side of the vehicle body frame using a screwed portion provided in the vehicle body frame. It has a mounting part that can be worn,
The left unsprung tool includes a swing arm side connecting portion for connecting the shock absorber or the alternative shock absorber, and uses the screwing portion provided on the left arm of the swing arm. It has a mounting part that can be attached to the left arm,
The right unsprung tool includes a swing arm side connecting portion for connecting the shock absorber or the alternative shock absorber, and uses the screwing portion provided on the right arm of the swing arm. A rear wheel suspension mounting device for a rear unicycle configured to have a mounting portion attachable to a right arm. The mounting portion of the left unsprung tool has a fitting hole and / or chain case for inserting and screwing a support shaft provided in the left arm to connect the shock absorber to the swing arm. It consists of an insertion hole to enable tightening with a bolt attached to the swing arm,
The mounting portion of the right unsprung tool is provided with a fitting hole and / or a torque link for inserting and screwing a shock absorber mounted on the right arm to connect the shock absorber to the swing arm. The rear wheel suspension mounting device for a rear unicycle according to claim 2, which is a mounting hole for fitting a front end portion to a support shaft portion mounted on the right arm so as to support the right arm. The mounting portion of the left spring upper tool is a through hole for fastening the swinging arm together with a support shaft that supports the body frame, and / or a bolt hole for fastening together with an engine suspension bolt. Yes,
The mounting portion of the right spring upper tool is a through hole for fixing the swing arm together with a support shaft supported on the vehicle body frame and / or a bolt hole for fixing together with an engine suspension bolt. The rear-wheel suspension mounting apparatus for rear unicycles as described in any one of Claims 1-3.

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