JP4820207B2 - Scooter type vehicle power unit suspension system - Google Patents

Description

  The present invention relates to an improvement of a power unit suspension for a scooter type vehicle.

As a conventional power unit suspension device for a scooter type vehicle, a power unit connected to a vehicle body via a link mechanism is known (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 62-120288

FIG. 6 of Patent Document 1 will be described below.
One end of the first link 21 is attached to the main frame 8 by a support shaft 14 so as to freely swing up and down, and one end of the second link 31 is connected to the other end of the first link 21 by a support shaft 38 so as to be swingable. A rear body part (power unit) 3 is swingably connected to the other end of the two links 31 by a bolt 42.

  The longitudinal direction of the first link 21 extends rearward and obliquely upward. The first link 21 is attached to the bifurcated support pieces 28, 28, the bifurcated support pieces 28, 28, and between the cross member 12. The rubber pieces 46, 46 interposed in the upper and lower portions are provided, and as the rubber pieces 46, 46 are deformed due to compression, the movement of the power unit 3 in the vertical direction is restricted. Directional movement is restricted. On the other hand, the longitudinal direction of the second link 31 extends rearward and obliquely downward. The first link 21 has a protruding piece 44, the second link 31 has a lever 45, and the protruding piece 44 passes through the lever 45. Are provided with compression rubber pieces 47 and 48 loosely fitted on the shaft 49 with the projecting piece 44 interposed therebetween, and the front and rear of the power unit 3 as these compression rubbers 47 and 48 are deformed by compression. The movement in the direction is allowed, and when the maximum compression deformation is eventually reached, the movement in the front-rear direction is restricted.

  In the vehicle described above, the mechanism for restricting the movement of the power unit 3 in the vertical direction is arranged on the first link 21, and the mechanism for regulating the movement of the power unit 3 in the front-rear direction is arranged across the first link 21 and the second link 31. Since they are configured by different mechanisms, the number of parts increases, the structure becomes complicated, and the cost increases.

  An object of the present invention is to simplify the stopper structure that restricts the movement of the power unit and the rear wheel in the vertical direction and the front-rear direction.

  According to the first aspect of the present invention, the engine and the drive wheel are integrally provided in the power unit, the power unit is swingably suspended from the vehicle body, one end of the first link is swingably attached to the vehicle body, and the first link is substantially vertically moved. One end of the second link is swingably attached to the other end of the first link, the second link is extended substantially in the front-rear direction, and the power unit is swingably connected to the other end of the second link. One end of the connecting rod is swingably attached, the power unit is swingably attached to the other end of the connecting rod, and a stopper mechanism is provided on the vehicle body and the connecting rod to restrict the movement of the power unit in the front-rear direction. The line connecting the provided vehicle body side connecting shaft and the power unit side connecting shaft is extended in the vertical direction, and the power unit The connecting shaft by a connecting rod, characterized in that supported via an elastic member.

  As an action of the connecting rod, one end of the connecting rod is swingably attached to the vehicle body, and by extending a line segment connecting the vehicle body side connecting shaft and the power unit side connecting shaft provided on the connecting rod in the vertical direction, The first link, which has one end swingably attached to the vehicle body and extends substantially vertically, allows the power unit to move in the front-rear direction, restricts the power unit from moving in the front-rear direction by a stopper mechanism, When a vertical force is applied from the power unit, the elastic deformation of the power unit side connecting shaft by the elastic member and the second link allow the power unit to move in the vertical direction, and the elastic force generated by the deformation of the elastic member is large. When this happens, this elastic force restricts the vertical movement of the power unit.

In the invention according to claim 2, the connecting rod is provided with a second vehicle body side connecting shaft between the vehicle body side connecting shaft and the power unit side connecting shaft, and the power unit side connecting shaft is connected to the power unit via an elastic member. The second vehicle body side connecting shaft is connected to the vehicle body via an elastic member.
As an action of the elastic member, each elastic member of the power unit side connecting shaft and the second vehicle body side connecting shaft exhibits a damper function of absorbing the vibration of the power unit.

The invention according to claim 3 is characterized in that the stopper mechanism is composed of a protrusion provided on the connecting rod and a notch provided in the vehicle body for inserting the protrusion.
As a function of the stopper mechanism, when the power unit moves in the front-rear direction, the protrusion of the connecting rod hits the notch of the vehicle body to restrict the movement of the power unit. For example, when the protrusion is worn, the connecting rod is replaced.

  The invention according to claim 4 is to apply the stopper mechanism to the elastic body fixed to the end portion of the extending portion extending in the direction different from the power unit side connecting shaft from the vehicle body side connecting shaft of the connecting rod. And a restricting portion provided on the vehicle body.

  As an action of the stopper mechanism, when the power unit moves in the front-rear direction, the elastic body fixed to the end of the extension part of the connecting rod hits the restricting part provided on the vehicle body, and the movement of the power unit is exerted as a buffering and anti-vibration function While regulating.

The invention according to claim 5 is characterized in that a main stand is provided at a lower portion of the power unit.
As a function when the main stand is provided on the power unit side, when a single or a plurality of elastic members are provided in the conventional link mechanism, it acts on the above-described elastic members when the main stand below the power unit is set up. Since the direction of the force is different from the grounded state of the driving wheel when the main stand is stored, the vibration of the power unit may be more easily transmitted to the vehicle body than the grounded state of the driving wheel. However, in the present invention, the vibration of the power unit is absorbed by the damper function of the plurality of elastic members of the connecting rod even when the main stand provided at the lower part of the power unit is erected.

  According to a sixth aspect of the present invention, the elastic member is constituted by a rubber bush, and the rubber bush of the power unit side connecting shaft is provided with holes on the upper and lower sides of the power unit side connecting shaft so that it is softer in the vertical direction than the vehicle longitudinal direction. It is characterized by having.

  As a function of the rubber bush of the power unit side connecting shaft, by providing holes on the upper and lower sides of the power unit side connecting shaft, the holes are easily crushed when the power unit vibrates up and down, and the vertical vibration is easily absorbed.

  In the invention according to claim 7, the elastic member is constituted by a rubber bush, and the rubber bush of the second vehicle body side connecting shaft is provided with holes before and after the second vehicle body side connecting shaft. It has a soft property in the longitudinal direction of the vehicle body.

  As a function of the rubber bush of the second vehicle body side connecting shaft, by providing a hole in the front and back of the second vehicle body side connecting shaft, the hole is easily crushed when the power unit vibrates back and forth, and absorbs the front and back vibration. It becomes easy.

  The invention according to claim 8 includes a line segment connecting the vehicle body side connection shaft and the second vehicle body side connection shaft, and a line segment connecting the second vehicle body side connection shaft and the power unit side connection shaft. It is characterized by forming.

  As a function of the axis connecting each connecting shaft of the connecting rod, the power unit side connecting shaft can be arranged at the rear of the vehicle body with respect to the extension line of the line connecting the vehicle body connecting shaft and the second vehicle body connecting shaft. become. As a result, the power unit side connecting shaft can be separated from the vehicle body.

The invention according to claim 9 is characterized in that the connecting rod is single and is provided only on one side of the vehicle body.
As a function of the arrangement of the connecting rods, by providing a single connecting rod on one side of the vehicle body, the number of parts is reduced compared to, for example, providing a pair of left and right connecting rods on both sides of the vehicle body, and the link mechanism Becomes easier.

The invention according to claim 10 is characterized in that the connecting rod is formed by forging.
As a function of the connecting rod, by forming the connecting rod by forging, the strength of the connecting rod is improved, and when a predetermined strength is ensured, for example, the weight can be reduced compared to a cast made of the same material. .

According to an eleventh aspect of the present invention, the power unit side connection shaft is supported by a plurality of connection support portions provided in the second link, and the connection rod is connected to the first connection support portion of the plurality of connection support portions and the first connection. It is characterized in that it is connected to the power unit side connecting shaft by being sandwiched between the second connecting support portions located outside the vehicle body from the support portion .

  As a function of the support structure of the connecting rod, the power unit side connecting shaft provided on the connecting rod is supported by the first connecting support portion and the second connecting support portion located on both sides of the connecting rod, so that the connecting rod is connected to the power unit side. The rigidity of the part supported via a connecting shaft increases.

The invention according to claim 12 comprises a plurality of elastic members interposed between the power unit side connecting shaft and the connecting rod, these elastic members are arranged side by side in the axial direction, and the amount of deflection of the elastic member is a predetermined value. In order to set as below, it is provided with a restricting means provided between a plurality of elastic members.
As an action, the amount of deflection of the plurality of elastic members arranged in the axial direction and interposed between the power unit side connecting shaft and the connecting rod is set to a predetermined value or less by the restricting means.

  In the invention according to claim 1, one end of the connecting rod is swingably attached to the vehicle body, the power unit is swingably attached to the other end of the connecting rod, and the movement of the power unit in the front-rear direction is restricted between the vehicle body and the connecting rod. Since the line segment connecting the vehicle body side connecting shaft and the power unit side connecting shaft provided on the connecting rod is extended in the vertical direction, and the power unit side connecting shaft is supported by the connecting rod via the elastic member, the stopper mechanism is provided. In addition to restricting the movement of the power unit in the front-rear direction with the mechanism, it is possible to regulate the movement of the power unit in the vertical direction due to the elastic force generated when the elastic member of the power unit side connecting shaft provided on the connecting rod is deformed. The front and rear of the power unit while allowing freedom of movement in the two directions of the front and rear And because it can regulate the vertical movement by connecting rods, a stopper structure is simplified can reduce the number of parts, the cost can be reduced.

  In the invention according to claim 2, the connecting rod is provided with a second vehicle body side connecting shaft between the vehicle body side connecting shaft and the power unit side connecting shaft, and the power unit side connecting shaft is connected to the power unit via the elastic member. Since the second vehicle body side connecting shaft is connected to the vehicle body via the elastic member, the damper function is improved as compared with the case where the single elastic member is provided, and a larger vibration can be absorbed.

  In the invention according to claim 3, since the stopper mechanism is constituted by the protrusion provided on the connecting rod and the notch provided in the vehicle body for inserting the protrusion, for example, the protrusion needs to be replaced due to wear or the like. In this case, not only the replacement is facilitated as compared with the conventional case where the power unit is provided, but also the stopper mechanism can be provided with a simple structure.

  In the invention according to claim 4, the stopper mechanism is applied to the elastic body fixed to the end portion of the extending portion extending in a direction different from the power unit side connecting shaft from the vehicle body side connecting shaft of the connecting rod, and the elastic body. Since it is composed of a restriction part provided on the vehicle body, for example, by changing the shape of the elastic body or the hardness of the elastic body, the swing amount before and after the power unit can be easily adjusted while exhibiting the buffering and vibration isolation effect Furthermore, it is possible to easily cope with a case where a large swing amount is desired.

  In the invention according to claim 5, since the main stand is provided at the lower part of the power unit, the vibration of the power unit can be easily absorbed by the improvement of the damper function by the plurality of elastic members on the connecting rod side even when the main stand is set up. Vibrations transmitted to the vehicle body can be reduced.

  In the invention according to claim 6, the elastic member is formed of a rubber bush, and the rubber bush of the power unit side connecting shaft is provided with holes on the upper and lower sides of the power unit side connecting shaft so that it is softer in the vertical direction than in the longitudinal direction of the vehicle body. Therefore, the rubber bush of the power unit side connecting shaft actively absorbs the vibration due to the vertical movement of the power unit with a simple structure, making it difficult to transmit the vertical vibration of the power unit to the vehicle body frame.

  In the invention according to claim 7, the elastic member is constituted by a rubber bush, and the rubber bush of the second vehicle body side connecting shaft is provided with holes in the front and rear of the second vehicle body side connecting shaft, thereby making it possible to compare the vertical direction. Since it has a soft property in the longitudinal direction of the vehicle body, the rubber bushing on the second vehicle body side connecting shaft actively absorbs the vibration caused by the forward and backward movement of the power unit with a simple structure and transmits the longitudinal vibration of the power unit to the vehicle body frame. Can be difficult.

  In the invention according to claim 8, the line segment connecting the vehicle body side connection shaft and the second vehicle body side connection shaft and the line segment connecting the second vehicle body side connection shaft and the power unit side connection shaft, Since the power unit side connecting shaft can be arranged away from the vehicle body, the swing amount of the power unit side connecting shaft can be set large while preventing interference between the connecting rod and the vehicle body.

  In the invention according to claim 9, since the connecting rod is single and is provided only on one side of the vehicle body, the link mechanism can be simplified, the number of parts can be reduced, and the cost can be reduced.

  In the invention according to claim 10, since the connecting rod is formed by forging, the protrusion of the stopper mechanism can be formed with high strength, and the connecting rod can be reduced in weight.

In the invention which concerns on Claim 11, a power unit side connection axis | shaft is supported by the some connection support part with which a 2nd link is provided, and a connection rod is connected with the 1st connection support part among a plurality of connection support parts, and this 1st connection. Since it is connected to the power unit side connecting shaft by being sandwiched between the second connecting support portion located outside the vehicle body from the support portion , the connecting rod is supported by being sandwiched between the first connecting support portion and the second connecting support portion. Therefore, the rigidity of the portion that supports the connecting rod can be increased, and the effect of the connecting rod can be more reliably exhibited.

  In the invention according to claim 12, a plurality of elastic members interposed between the power unit side connecting shaft and the connecting rod are configured, these elastic members are arranged side by side in the axial direction, and the deflection amount of the elastic member is set to a predetermined value. Since it is provided with a restricting means provided between a plurality of elastic members for setting below, the amount of deflection of the elastic member can be set with a simple structure, and the amount of deflection can be freely changed by changing the shape of the restricting means. Since it can be changed, the degree of freedom in design can be increased.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a scooter type vehicle equipped with a power unit suspension device according to the present invention (first embodiment). The scooter type vehicle 10 suspends and steers a body frame 11 and a front wheel 12 as a skeleton. A front wheel suspension steering mechanism 13 provided at the front of the vehicle body frame 11, a rear wheel suspension drive mechanism 16 connected to a substantially central portion of the vehicle body frame 11 to suspend and drive the rear wheel 14, and a rear portion of the vehicle body frame 11. It consists of a storage box 17 and a fuel tank 18 attached to the upper part.

  The vehicle body frame 11 includes a head pipe 25 provided at the front end, and a pair of left and right main frames 26 and 27 extending from the head pipe 25 in a substantially U shape in a side view and extending rearward and obliquely upward (reference numerals on the front side). 26), a pair of left and right pivot plates 31 and 32 (only the reference numeral 31 on the front side) for supporting the first pivot shaft 28, and these pivot plates 31 and 32 are attached to the main frames 26 and 27 together. A plurality of cross members for connecting the pair of left and right pivot frames 33 and 34 (only the reference numeral 33 on the front side) attached to the rear part of the center of the main frames 26 and 27 and the left and right main frames 26 and 27 for attachment. (Not shown). Reference numerals 36 to 38 are reinforcing plates, 41 is a reinforcing frame, and a pair of left and right 42 and 43 (only the reference numeral 42 on the front side is shown) is a reinforcing frame.

  The front wheel suspension steering mechanism 13 includes a front fork 51 that is attached to the head pipe 25 so as to be steerable, and a bar handle 53 that is attached to an upper end of a steering shaft 52 provided in the front fork 51.

The rear wheel suspension drive mechanism 16 includes a first pivot shaft 28, a link mechanism 55 swingably attached to the first pivot shaft 28, a power unit 56 swingably attached to the link mechanism 55, and the power unit 56. An air intake device 57 attached to the upper portion, an exhaust device (not shown) attached to the lower portion of the power unit 56, and a rear cushion unit 58 attached to the rear end of the power unit 56 and the rear end of the main frame 26, respectively. .
The first pivot shaft 28, the link mechanism 55, and the rear cushion unit 58 described above constitute a power unit suspension device 16A that suspends the power unit 56.

  The power unit 56 includes an engine 59 having a substantially horizontal cylinder portion 59a and a continuously variable transmission 60 provided integrally with a rear portion of the engine 59. The rear wheel 14 is disposed at the rear end of the continuously variable transmission 60. An output shaft 60a serving as an axle is provided. Reference numeral 61 denotes a main stand attached to the lower portion of the crankcase 62 constituting the power unit 56.

  In the figure, 65 is a handle cover, 66 is a headlamp, 67 is a front cover, 68 is a front fender, 71 is a step floor, 72 is a seat, 73 is a tail lamp, and 74 is a rear fender.

FIG. 2 is a first perspective view (first embodiment) showing a vehicle body frame center portion and a link mechanism of a scooter type vehicle according to the present invention, and an arrow (FRONT) in the drawing represents the front of the vehicle (the same applies hereinafter). .
The link mechanism 55 includes first links 81 and 81 (only the reference numeral 81 on the front side is shown) swingably attached to the first pivot shaft 28, and a second pivot shaft 92 attached to the tip of the first link 81. The second link 82 swingably attached to the second pivot shaft 92, the third pivot shaft 93 attached to the upper portion of the inner pivot plate 31b provided on the one pivot frame 33 side, and the tip of the second link 82 And a connecting rod 84 that is swingably attached to the third pivot shaft 93 and connected to the fourth pivot shaft 94.

  The pivot plate 31 includes an outer pivot plate 31 a attached to the outer side surfaces of the main frame 26 and the pivot frame 33, and an inner pivot plate 31 b attached to the inner side surface of the main frame 26 and the pivot frame 33.

  The pivot plate 32 includes an outer pivot plate 32a attached to the outer side surfaces of the main frame 27 and the pivot frame 34, and an inner pivot plate 32b (not shown) attached to the inner side surfaces of the main frame 27 and the pivot frame 34, respectively. Consists of.

The connecting rod 84 is also a member attached to the inner pivot plate 31b via the intermediate shaft 95.
The fourth pivot shaft 94 is a shaft that supports the power unit 56 (see FIG. 1) in a swingable manner.

  FIG. 3 is a second perspective view (first embodiment) showing a vehicle body frame center portion and a link mechanism of a scooter type vehicle according to the present invention. A pivot plate 31 is attached to the left main frame 26 and the pivot frame 33, and the right side. The pivot plate 32 is attached to the main frame 27 and the pivot frame 34, the first pivot shaft 28 is attached to the pivot plates 31, 32, and the first links 81, 81 are attached to the first pivot shaft 28 in a swingable manner. The second link 82 is swingably attached to the first links 81, 81 via the second pivot shaft 92, the fourth pivot shaft 94 is attached to the rear end of the second link 82, and the second pivot 82 is attached to the inner pivot plate 31b. 3 A connecting rod 84 is swingably attached via a pivot shaft 93, and the lower end of the connecting rod 84 is 4 is connected to the pivot shaft 94, indicating that connects the intermediate portion of the inner pivot plate 31b and the connecting rod 84 in the intermediate shaft 95.

  FIG. 4 is a perspective view showing the link mechanism according to the present invention (first embodiment). The link mechanism 55 mainly includes first links 81 and 81, a second pivot shaft 92, and a second link 82. The upper pivot coupling includes a third pivot shaft 93, a coupling rod 84, a fourth pivot shaft 94, and an intermediate shaft 95, and more specifically, a front upper coupling coupling the first pivot shaft 28 and the first link 81. A mechanism 101 and a front lower connecting mechanism 102 that connects the first link 81 and the second pivot shaft 92 are provided. The front upper connecting mechanism 101 and the front lower connecting mechanism 102 will be described in detail later.

  FIG. 5 is a perspective view (first embodiment) showing the stopper mechanism of the link mechanism according to the present invention. Specifically, the pivot plate 31, more specifically, the rear lower portion of the inner pivot plate 31b and the diagonally lower front of the intermediate shaft 95, A notch 31c that opens downward is formed, and a protrusion 84a that protrudes upward and is inserted into the notch 31c is formed on the inner surface of the connecting rod 84. The notch 31c and the protrusion 84a constitute the stopper mechanism 105. Indicates that

  The notch 31c includes a front edge portion 31j, a rear edge portion 31k, and an upper edge portion 31m, and the protrusion 84a hits the front edge portion 31j or the rear edge portion 31k so that the connecting rod 84 swings in the front-rear direction with respect to the inner pivot plate 31b. Is regulated.

  FIG. 6 is a side view (first embodiment) showing a main part of the link mechanism according to the present invention, in which the first link 81 extends substantially in the vertical direction, and the second link 82 substantially extends in the front-rear direction. The connecting rod 84 extends substantially vertically, and the link mechanism 55 moves the first link 81 because the second link 82 moves back and forth around the first pivot shaft 28 and the third pivot shaft 93. And the connecting rod 84 constitute a parallel link substantially parallel. That is, the first link 81 and the connecting rod 84 allow the power unit 56 to move in the front-rear direction.

  Further, the second link 82 extends substantially in the front-rear direction and swings about the second pivot shaft 92, and the fourth pivot shaft 94 is elastically supported on the connecting rod 84 side. Allow movement in direction.

  FIG. 7 is a side view showing the link mechanism according to the present invention (first embodiment). The connecting rod 84 of the link mechanism 55 is connected to each of the third pivot shaft 93, the fourth pivot shaft 94, and the intermediate shaft 95. For this purpose, the through holes 84b, 84c and 84d are opened in the upper end, the lower end and the middle part, and the rubber bushes 111, 112 and 113 are fitted in the through holes 84b, 84c and 84d, respectively.

  The rubber bush 111 includes an inner cylinder 115 fitted to the third pivot shaft 93, an outer cylinder 116 provided outside the inner cylinder 115 and fitted in the through hole 84b, and the inner cylinder 115 and the outer cylinder. 116 and rubber 117 bonded to each of 116.

The rubber bush 112 includes an inner cylinder 121 fitted to the fourth pivot shaft 94, an outer cylinder 122 provided outside the inner cylinder 121 and fitted in the through hole 84c, and the inner cylinder 121 and the outer cylinder. And rubber 123 bonded to each of 122.
123a and 123b in the drawing are arc-shaped holes formed in the rubber 123 above and below the inner cylinder 121 so that the rubber 123 can be easily deformed up and down.

The rubber bush 113 includes an inner cylinder 126 fitted to the intermediate shaft 95, an outer cylinder 127 provided outside the inner cylinder 126 and fitted into the through hole 84d, and the inner cylinder 126 and the outer cylinder 127. It consists of rubber 128 bonded to each.
128a and 128b in the figure are holes formed in the rubber 128 at the front and rear of the inner cylinder 126 so that the rubber 128 can be easily deformed up and down.

  131 is a line segment connecting the axis 93a of the third pivot shaft 93 (the axis 93a is indicated by a black circle) and the axis 95a of the intermediate shaft 95 (the axis 95a is indicated by a black circle), and the axis 95a of the intermediate shaft 95 is connected to the fourth axis 95a. When a line segment connecting the axis line 94a of the pivot shaft 94 (the axis line 94a is indicated by a black circle) is 132, and a line segment connecting the axis line 93a of the third pivot shaft 93 and the axis line 94a of the fourth pivot shaft 94 is 133, The line segment 132 is tilted toward the vehicle rear side by an angle θ with respect to the line segment 131, and the line segment 131 and the line segment 132 draw a cross-shaped shape. That is, by moving the fourth pivot shaft 94 to the rear of the vehicle with respect to the third pivot shaft 93 and the intermediate shaft 95, the periphery of the fourth pivot shaft 94 is the vehicle body side, specifically, the pivot plates 31, 32 (FIG. 3). Reference) and pivot frames 33 and 34 (see FIG. 3), and can be moved greatly back and forth and up and down.

  8 is a cross-sectional view taken along line 8-8 in FIG. 6 (first embodiment). The front upper coupling mechanism 101 that couples the first pivot shaft 28 and the first link 81 passes through the pivot plate 31. FIG. A left cylinder part 141 provided with a hollow part 141a for attaching and inserting the first pivot shaft 28, a right outer cylinder part 142 attached by penetrating the pivot plate 32, and a screw connection to the right outer cylinder part 142 and a first A right inner cylinder part 143 having a hollow part 143a into which the first pivot shaft 28 is inserted, an inner cylinder 144 having a hollow part 144a into which the first pivot axis 28 is inserted, and both ends of the outer peripheral surface of the inner cylinder 144 The fitted needle bearings 146, 147, and the inner circumference having a larger inner diameter than the hollow portion 148a at both ends of the hollow portion 148a in order to fit these needle bearings 146, 147 148b, 148c formed outer cylinder 148, an end provided with a dust seal 151 that contacts one end surface of the inner cylinder 144 and prevents dust and the like from entering the needle bearing 146, and has an insertion hole 152a in the first pivot shaft 28 And an end plate 154 provided with a dust seal 153 that contacts the other end surface of the inner cylinder 144 and prevents dust and the like from entering the needle bearing 147 and has an insertion hole 154a for the first pivot shaft 28. The first links 81 and 81 are attached to the outer peripheral surfaces of both ends of the outer cylinder 148 by welding, and the outer cylinder 148 rotates with respect to the inner cylinder 144 via the needle bearings 146 and 147, The first links 81 and 81 swing with respect to the one pivot shaft 28. Reference numeral 156 denotes a nut that is screw-coupled to the male thread at the end of the bolt-shaped first pivot shaft 28.

  The front lower connecting mechanism 102 that connects the first links 81, 81 and the second pivot shaft 92 includes an inner cylinder 161 having a hollow portion 161 a into which the second pivot shaft 92 is inserted, and an outer peripheral surface of the inner cylinder 161. Needle bearings 162, 163 fitted to both ends of the inner surface, and inner peripheral surfaces 164b, 164c having inner diameters larger than the hollow part 164a at both ends of the hollow part 164a in order to fit these needle bearings 162, 163 And an end plate 167 provided with a dust seal 166 that contacts the one end surface of the inner cylinder 161 and prevents entry of dust and the like into the needle bearing 162 and has an insertion hole 167a in the second pivot shaft 92. And a dust seal 168 that attaches to the other end surface of the inner cylinder 161 and prevents dust and the like from entering the needle bearing 163. And an end plate 169 having an insertion hole 169a for the second pivot shaft 92. The outer cylinder 164 rotates with respect to the inner cylinder 161 via the needle bearings 162 and 163. In contrast, the second link 82 (see FIG. 6) swings. Reference numeral 81a denotes a bolt insertion hole formed in the first link 81 so as to allow the second pivot shaft 92 to pass therethrough, and 171 denotes a nut that is screw-coupled to a male screw at the end of the bolt-shaped second pivot shaft 92.

  FIG. 9 is a cross-sectional view taken along line 9-9 of FIG. 6 (first embodiment), and the second link 82 is attached to the outer cylinder 164 by welding so as to spread toward the rear, and the left arm 175 and the right arm 176, an intermediate connection pipe 177 attached to each intermediate portion of the left arm 175 and the right arm 176 so as to extend in the vehicle width direction, and protruded to the left of the vehicle body from the left arm 175 of the intermediate connection pipe 177 The fourth pivot shaft 94 is supported by the left arm 175, the right arm 176, and the end arm 178 as these three connection support portions.

  The connecting rod 84 is located between the left arm 175 (which is a first connecting support portion) and the end arm 178 (which is a second connecting support portion), and the left arm 175 and the end arm 178 thereof. Therefore, the rigidity of the support portion of the connecting rod 84 can be increased. Reference numerals 62a and 62b denote link connecting portions provided on the crankcase 62 of the power unit 56 so as to protrude forward.

  FIG. 10 is a sectional view taken along line 10-10 in FIG. 6 (first embodiment), and shows that the link connecting portions 62a and 62b of the power unit 56 are connected to the fourth pivot shaft 94 via the rubber bushes 181 and 181. .

  The rubber bush 181 is fitted to the inner cylinder 184 having a hollow portion 184a into which the fourth pivot shaft 94 is inserted, and the through hole 62c opened in the link connecting portion 62a or the through hole 62d opened in the link connecting portion 62b. The cylinder 185 includes a rubber 186 bonded to each of the inner cylinder 184 and the outer cylinder 185. 31e and 31f are bolt insertion holes formed in the inner pivot plate 31b for passing the third pivot shaft 93, 31g and 31h are bolt insertion holes formed in the inner pivot plate 31b for passing the intermediate shaft 95, and 191 A nut screw-connected to the male screw at the end of the third pivot shaft 93, a nut 192 screw-connected to the male screw at the end of the fourth pivot shaft 94, and a screw nut 193 to the male screw at the end of the intermediate shaft 95 The nut 194 is a collar that passes through the fourth pivot shaft 94 and is disposed between the left and right rubber bushes 181 and 181.

  In the connecting rod 84, the through hole 84c that supports the fourth pivot shaft 94 is disposed closer to the center in the vehicle width direction than the through holes 84b and 84d that support the third pivot shaft 93 and the intermediate shaft 95. Since the lower end portion of the connecting rod 84 is located closer to the center in the vehicle width direction, the bank angle can be increased.

The operation of the stopper mechanism 105 described above will be described next.
FIGS. 11A and 11B are operation diagrams (first embodiment) illustrating the operation of the stopper mechanism according to the present invention. In addition, the imaginary line in a figure shows the state before a movement or a swing.
In (a), for example, when the power unit 56 moves to the front of the vehicle body as shown by the white arrow, the connecting rod 84 swings in the direction of the arrow about the third pivot shaft 93, and the rubber bush 112 and 113 bend and stop due to the reaction force of rubber. However, when the forward swing angle of the connecting rod 84 is further increased, the rubber bushings 112 and 113 are greatly bent, and the protrusion 84a provided on the connecting rod 84 hits the front edge portion 31j of the notch 31c on the pivot plate 31 side. The swing of the connecting rod 84 with respect to the pivot plate 31 stops.

  In (b), for example, when the power unit 56 moves rearward of the vehicle body as indicated by the white arrow, the connecting rod 84 swings in the direction of the arrow about the third pivot shaft 93, and the rubber bush 112 and 113 bend and stop due to the reaction force of rubber. However, when the rearward swing angle of the connecting rod 84 is further increased, the rubber bushings 112 and 113 are greatly bent, and the protrusion 84a of the connecting rod 84 hits the rear edge portion 31k of the notch 31c on the pivot plate 31 side. The swing of the connecting rod 84 with respect to the plate 31 stops.

FIGS. 12A and 12B are operation diagrams (first embodiment) showing the operation of the stopper structure using the stopper mechanism and the connecting rod according to the present invention. In addition, the imaginary line in a figure shows the state before a movement or a swing.
In (a), when the power unit 56 moves upward as indicated by the white arrow, the fourth pivot shaft 94 moves upward, and the second link 82 is centered on the second pivot shaft 92. When swinging in the direction of the arrow, the rubber bush 112 of the connecting rod 84 is greatly bent and the upward movement of the fourth pivot shaft 94 becomes large, the inner cylinder 121 of the rubber bush 112 approaches the outer cylinder 122, and the inner cylinder 121 The rubber 123 between the outer cylinder 122 and the outer cylinder 122 is greatly compressed to generate a large elastic force, and the elastic force stops the rise of the fourth pivot shaft 94 with respect to the connecting rod 84. In this case, since the upward bending of the rubber bushings 111 and 113 of the connecting rod 84 is very small as compared with the rubber bushing 112, the positional relationship of the connecting rod 84 with respect to the pivot plate 31 is not substantially changed. It can be said that the upward movement distance of 56 is the movement distance of the fourth pivot shaft 94 with respect to the connecting rod 84.

  In (b), when the power unit 56 moves downward as indicated by the white arrow, the fourth pivot shaft 94 moves downward, and the second link 82 is centered on the second pivot shaft 92. When swinging in the direction of the arrow, the rubber bush 112 of the connecting rod 84 is greatly bent and the movement of the fourth pivot shaft 94 is increased, the inner cylinder 121 of the rubber bush 112 approaches the outer cylinder 122, and the inner cylinder 121 and the outer cylinder The rubber 123 between the first and second rubber members 122 is greatly compressed to generate a large elastic force, and the elastic force stops the lowering of the fourth pivot shaft 94 with respect to the connecting rod 84. In this case, since the downward bending of the rubber bushings 111 and 113 of the connecting rod 84 is negligible compared to the rubber bushing 112, the positional relationship of the connecting rod 84 with respect to the pivot plate 31 is not substantially changed. The downward movement distance of 56 can be said to be approximately the movement distance of the fourth pivot shaft 94 relative to the connecting rod 84.

  FIG. 13 is a third perspective view (second embodiment) showing a vehicle body frame central portion and a link mechanism according to the present invention, and comprises a main frame 26 and a pivot frame 33 on the left side and an outer pivot plate 231a and an inner pivot plate 231b. The pivot plate 231 is attached, the pivot plate 232 is attached to the right main frame 27 and the pivot frame 34, the first pivot shaft 28 is attached to the outer pivot plate 231 a and the pivot plate 232, and the first pivot shaft 28 is attached to the first pivot shaft 28. The first links 81 and 81 are swingably attached, and the second links 234 are swingably attached to the first links 81 and 81 via a second pivot shaft 92 (not shown), and the rear ends of the second links 234 are attached. A fourth pivot shaft 94 is attached to the outer pivot. The connecting rod 236 is swingably attached to the rate 231a and the inner pivot plate 231b via the third pivot shaft 233, and the lower end portion of the connecting rod 236 is swingably connected to the fourth pivot shaft 94. It shows that a stopper rubber 237 provided at the upper end of the connecting rod 236 is disposed between the pivot plate 231b and the rear wall 231c.

A power unit 56 (see FIG. 1) is supported by the link mechanism 240 so as to be swingable with respect to the main frames 26 and 27 and the pivot frames 33 and 34.
The first pivot shaft 28, the link mechanism 240, and the rear cushion unit 58 (see FIG. 1) constitute a power unit suspension device 16B (see FIG. 15) that suspends the power unit 56 (see FIG. 1).

FIG. 14 is a perspective view showing a link mechanism according to the present invention (second embodiment). The link mechanism 240 mainly includes a first link 81, 81, a second pivot shaft 92, and a second link 234. , A third pivot shaft 233, a connecting rod 236, and a fourth pivot shaft 94, and more specifically, a front upper connecting mechanism 101 that connects the first pivot shaft 28 and the first link 81; A front lower connecting mechanism 102 that connects the one link 81 and the second pivot shaft 92 is provided.
The second link 234 includes a left arm 241 and a right arm 242 attached to the outer cylinder 164, and supports the fourth pivot shaft 94 by the left arm 241 and the right arm 242.

  FIG. 15 is a side view of a main part showing a link mechanism according to the present invention (second embodiment), in which the first link 81 extends in a substantially vertical direction, and the second link 234 is in a substantially front-rear direction. The connecting rod 236 extends substantially vertically, and the link mechanism 240 moves the first link 81 because the second link 234 moves back and forth around the first pivot shaft 28 and the third pivot shaft 233. And the connecting rod 236 form a parallel link that is substantially parallel. That is, the first link 81 and the connecting rod 236 allow the power unit 56 to move in the front-rear direction.

  The second link 234 extends substantially in the front-rear direction and swings about the second pivot shaft 92. The fourth pivot shaft 94 is elastically supported on the connecting rod 236 side. Allow movement in direction.

  FIG. 16 is a side view showing the link mechanism according to the present invention (second embodiment). The connecting rod 236 of the link mechanism 240 is attached to the main plate member 243 and the intermediate portion of the main plate member 243. The upper cylindrical member 244, the lower cylindrical member 246 attached to the lower part of the main plate member 243, and the upper sub-plate having an L-shaped cross section attached to the side surface of the main plate member 243 and the outer peripheral surface of the upper cylindrical member 244 A member 247, a side-view inner plate member 248 attached to the side surface of the main plate member 243 and the inner surface of the upper sub-plate member 247, an upper cylindrical member 244 and a side plate of the main plate member 243 A lower sub-plate member 251 having a U-shaped cross-section attached across the outer peripheral surface of the lower cylindrical member 246 and a third pivot shaft 233 are connected. A rubber bushing 253 fitted in the hollow portion of the upper cylindrical member 244, a rubber bushing 254 fitted in the hollow portion of the lower cylindrical member 246 to be connected to the fourth pivot shaft 94, and an inner plate member And a stopper rubber 237 attached to the upper portion of the H.248. In addition, 236A is an extending portion extending upward from the third pivot shaft 233 of the connecting rod 236, 237a is a front surface of the stopper rubber 237, and 237b is a rear surface of the stopper rubber 237.

  The rubber bushing 253 includes an inner cylinder 256 fitted to the third pivot shaft 233, an outer cylinder 257 provided outside the inner cylinder 256 and fitted to the upper cylinder member 244, the inner cylinder 256 and the outer cylinder 256 The rubber 258 is bonded to each of the cylinders 257.

  The rubber bushing 254 includes an inner cylinder 261 fitted to the fourth pivot shaft 94, an outer cylinder 262 provided outside the inner cylinder 261 and fitted to the lower cylinder member 246, the inner cylinder 261 and the outer cylinder 261. A rubber 263 bonded to each of the cylinders 262, in which the rubber 263 is easily deformed in the direction in which the straight line 265 extends, and the rubber 263 is provided with arc-shaped holes 263a and 263b that are symmetrical with respect to the straight line 265. It is.

  The stopper rubber 237 is a member in which the front surface 237a is applied to the main frame 26 and the back surface 237b is applied to the rear wall 231c of the inner pivot plate 231b. When the connecting rod 236 swings back and forth like a seesaw, It is an elastic body that functions as a stopper mechanism 266 that regulates the swing while buffering and preventing vibration.

  That is, the stopper rubber 237, the rear wall 231c of the inner pivot plate 231b, and the main frame 26 constitute a stopper mechanism 266, and the rear wall 231c and the main frame 26 are restriction portions provided on the vehicle body. .

  A line segment connecting the axis line 233a of the third pivot shaft 233 (the axis line 233a is indicated by a black circle) and the axis line 94a of the fourth pivot axis 94 (the axis line 94a is indicated by a black circle) is 267, and a straight line passing through the axis line 94a is 265. If a straight line passing through the axis 94a and orthogonal to the straight line 265 is 268, the line segment 267 and the straight line 265 form a predetermined angle α.

  The direction in which the straight line 268 extends, specifically, the direction of the arrow A is the direction in which the fourth pivot shaft 94 receives a reaction force when the vehicle accelerates, and the direction of the arrow B is when an occupant (one person) gets on the vehicle. The direction in which the fourth pivot shaft 94 receives a force and the direction in which the straight line 265 extends is the vibration direction of the engine 59 (see FIG. 1). Further, the endless curve 271 and the inner side of the curve 271 in the figure are the movable range of the fourth pivot shaft 94.

  By providing the holes 263a and 263b in the direction along the straight line 265 in the rubber 263 of the rubber bushing 254 that elastically supports the fourth pivot shaft 94, a large spring constant and large hysteresis are provided for the reaction force during acceleration of the vehicle. In addition, the engine vibration can be effectively suppressed by supporting with a small spring constant.

  FIG. 17 is a cross-sectional view taken along line 17-17 of FIG. 15, and shows that the link connecting portions 62a and 62b of the power unit 56 are connected to the fourth pivot shaft 94 via the rubber bushes 281 and 281.

  The rubber bushing 281 is fitted to the inner cylinder 284 having a hollow portion 284a into which the fourth pivot shaft 94 is inserted and the through hole 62c opened in the link connecting portion 62a or the through hole 62d opened in the link connecting portion 62b. The cylinder 285 is composed of a rubber 286 bonded to each of the inner cylinder 284 and the outer cylinder 285.

  In the figure, reference numerals 231e and 231f denote bolt insertion holes formed in the outer pivot plate 231a and the inner pivot plate 231b for passing the third pivot shaft 233, and reference numeral 291 denotes a nut screwed to the external thread at the end of the third pivot shaft 233. 294 is a collar that passes through the fourth pivot shaft 94 and is disposed between the left and right rubber bushes 281 and 281, 296 and 297 are collars attached to the tip of the second link 234, and 298 is an inner cylinder 284 of one rubber bush 281. A collar 301 provided between the inner plate member 297 and the collar 297 is a slit provided in the inner plate member 248 for inserting and fixing the stopper rubber 237 (see FIG. 16).

FIG. 18 is a perspective view showing a link mechanism according to the present invention (third embodiment). The same components as those in the first and second embodiments described above are denoted by the same reference numerals, and detailed description thereof is omitted. .
The link mechanism 310 supports the power unit 56 (see FIG. 1) in a swingable manner with respect to the vehicle body frame 11 (see FIG. 1), and is mainly a first link that is swingably attached to the first pivot shaft 28. 311, 311, a second pivot shaft 92 attached to the first links 311, 311, a second link 312 swingably attached to the second pivot shaft 92, a third pivot shaft 233, and a connecting rod 236 and a fourth pivot shaft 94 attached to the tip of the second link 312, and more specifically, a front upper coupling mechanism 314 that couples the first pivot shaft 28 and the first links 311, 311, A connecting member 315 mounted between the left and right first links 311, 311, and a front lower connection that connects the first links 311, 311 and the second pivot shaft 92. And a structure 316.

  The link mechanism 310, the first pivot shaft 28, and the rear cushion unit 58 (see FIG. 1) constitute a power unit suspension device 16C that suspends the power unit 56.

The second link 312 includes a left arm 317 and a right arm 318 attached to the cylindrical member 343, and an intermediate connection attached to each intermediate portion of the left arm 317 and the right arm 318 so as to extend in the vehicle width direction. The fourth pivot shaft 94 is supported by the left arm 317 and the right arm 318.
The connecting member 315 has a smaller diameter than the outer cylinder 327 constituting the front upper coupling mechanism 314 and the outer cylinder 347 (see FIG. 19) constituting the front lower coupling mechanism 316.

  FIG. 19 is a cross-sectional view taken along line 19-19 of FIG. 18. The front upper coupling mechanism 314 that couples the first pivot shaft 28 and the first links 311 and 311 includes a left upper coupling mechanism 321 and a right upper coupling mechanism 322. And a cylindrical member 323 interposed between each of the upper left coupling mechanism 321 and the upper right coupling mechanism 322. The upper left coupling mechanism 321 and the upper right coupling mechanism 322 are symmetrical and have the same basic structure. Therefore, only the upper left coupling mechanism 321 will be described.

  The upper left coupling mechanism 321 includes an inner cylinder 325 having a hollow portion 325a into which the first pivot shaft 28 is inserted, a needle bearing 326 fitted to the outer peripheral surface of the inner cylinder 325, and the needle bearing 326 fitted. An outer cylinder 327 formed with an inner peripheral surface 327a and a dust seal 328 for preventing dust and the like from entering the needle bearing 326, and an insertion hole 331a for the first pivot shaft 28 is opened to form an outer pivot plate 231a (upper right) The part connecting mechanism 322 includes a pivot plate 232) and an end plate 331 sandwiched between the inner cylinder 325, and the first link 311 is attached to the outer peripheral surface of the outer cylinder 327 by welding. The outer cylinder 327 rotates with respect to the cylinder 325 via the needle bearing 326, so that The first link 311 swings Te. Reference numeral 333 denotes a dust seal provided between the inner cylinder 325 and the outer cylinder 327 in order to prevent dust and the like from entering the needle bearing 326.

  A front lower connecting mechanism 316 that connects the first links 311, 311 and the second pivot shaft 92 includes a left lower connecting mechanism 341, a right lower connecting mechanism 342, and these left lower connecting mechanism 341 and right lower connecting mechanism. Since the left lower connecting mechanism 341 and the right lower connecting mechanism 342 are bilaterally symmetrical and have the same basic structure, only the left lower connecting mechanism 341 will be described.

  The lower left connecting mechanism 341 includes an inner cylinder 345 having a hollow portion 345a into which the second pivot shaft 92 is inserted, a needle bearing 346 fitted to the outer peripheral surface of the inner cylinder 345, and the needle bearing 346 fitted. And an outer cylinder 347 having an inner peripheral surface 347a, a dust seal 348 for preventing dust and the like from entering the needle bearing 346, and an insertion hole 351a for the second pivot shaft 92 to open the second pivot shaft 92. An end plate 351 sandwiched between a head 92a (a nut 171 for the lower right coupling mechanism 342) and an inner cylinder 345, and a first link 311 attached to the outer peripheral surface of the outer cylinder 347 by welding. As the inner cylinder 345 and the second pivot shaft 92 rotate with respect to the outer cylinder 347 via the needle bearing 346, the first link The second link 312 swings welded to the inner cylinder 345 relative to 11. Reference numeral 353 denotes a dust seal provided between the inner cylinder 345 and the outer cylinder 347 in order to prevent dust and the like from entering the needle bearing 346.

FIG. 20 is a side view (fourth embodiment) showing a link mechanism according to the present invention. The same components as those in the first embodiment shown in FIGS.
The link mechanism 360 includes first links 81 and 81 (only the front side reference numeral 81 is shown), a second pivot shaft 92, a second link 358 swingably attached to the second pivot shaft 92, and a third link The pivot shaft 93, the fourth pivot shaft 94, and a connecting rod 361 that is swingably attached to the third pivot shaft 93 and connected to the fourth pivot shaft 94.

  The connecting rod 361 has a through hole 84b, a bush mounting hole 361a, and a through hole 84d at the upper end, the lower end, and the intermediate part, respectively, for connecting to the third pivot shaft 93, the fourth pivot shaft 94, and the intermediate shaft 95. The rubber bushes 111, 362, and 363 are fitted into the through holes 84b, the bush mounting holes 361a, and the through holes 84d, respectively.

  The rubber bush 362 includes an inner cylinder 364 fitted to the fourth pivot shaft 94, an outer cylinder 365 provided outside the inner cylinder 364 and fitted into the bush mounting hole 361a, the inner cylinder 364 and the outer cylinder 364. It consists of rubber 366 bonded to each of the tubes 365.

The rubber bush 363 includes an inner cylinder 126 fitted to the intermediate shaft 95, an outer cylinder 127 provided outside the inner cylinder 126 and fitted into the through hole 84d, and the inner cylinder 126 and the outer cylinder 127. It consists of rubber 367 bonded to each.
367a and 367b in the drawing are holes formed in the rubber 367 on the front and rear sides of the inner cylinder 126 in order to make the rubber 367 easily deformable in the vertical direction, and are symmetric with respect to the line segment 131. is there.

  FIG. 21 is a sectional view taken along line 21-21 in FIG. 20 (fourth embodiment). A front upper coupling mechanism 371 that couples the first pivot shaft 28 and the first link 81 passes through the pivot plate 31. A left cylinder part 141 having a hollow part 141a for mounting and inserting the first pivot shaft 28, and a right cylinder part 372 having a hollow part 372a for attaching the first pivot shaft 28 while inserting the pivot plate 32 therethrough. An inner cylinder 144 having a hollow portion 144a into which the first pivot shaft 28 is inserted, and a left rubber bush 373 into which the first pivot shaft 28 is inserted and disposed between the left cylinder portion 141 and the inner cylinder 144, respectively. A right rubber bush 374 inserted between the right cylinder portion 372 and the inner cylinder 144 and the left rubber bushes being inserted into the first pivot shaft 28. 373 and the right rubber bush 374 are fitted with outer cylinders 148 having inner peripheral surfaces 148b and 148c having inner diameters larger than the hollow parts 148a at both ends of the hollow part 148a. The first links 81 and 81 are attached to the outer peripheral surface by welding, and the outer cylinder 148 rotates with respect to the inner cylinder 144 via the left rubber bush 373 and the right rubber bush 374, whereby the first pivot shaft. 28, the first links 81 and 81 swing.

  The left rubber bushing 373 is disposed so as to surround the inner cylinder 376 having a hollow portion 376a into which the first pivot shaft 28 is inserted, and is disposed outside the outer cylinder 148 so as to be fitted to the inner peripheral surface 148b of the outer cylinder 148. The cylinder 377 includes a rubber 378 bonded to each of the inner cylinder 376 and the outer cylinder 377.

  The right rubber bush 374 is disposed so as to surround the inner cylinder 381 having a hollow portion 381a into which the first pivot shaft 28 is inserted, and the outer cylinder 148c is fitted to the inner peripheral surface 148c of the outer cylinder 148. The cylinder 382 includes a rubber 383 bonded to each of the inner cylinder 381 and the outer cylinder 382.

  FIG. 22 is a cross-sectional view taken along line 22-22 of FIG. 20 (fourth embodiment). The second link 358 is attached to the outer cylinder 164 by welding so as to spread toward the rear, and is substantially U-shaped. The arm 386 and a sub arm 387 attached to the left side of the main arm 386, and the fourth pivot shaft 94 is supported by the main arm 386 and the sub arm 387.

  Since the connecting rod 361 is located between the main arm 386 and the sub arm 387 and supported by the main arm 386 and the sub arm 387 via the fourth pivot shaft 94, the rigidity of the support portion of the connecting rod 361 is increased. be able to.

  In the drawing, reference numeral 391 denotes an outer tab that is press-fitted into through holes 62e and 62f provided in the link connecting portions 62a and 62b of the crankcase 62, respectively, and reference numeral 392 is fitted to the fourth pivot shaft 94 and is slidable with the outer tab 391. An inner bush that fits into

  23 is a cross-sectional view taken along the line 23-23 in FIG. 20 (fourth embodiment). The link connecting portion of the power unit 56 is connected to the fourth pivot shaft 94 via the metal bushes 393 and 393 including the outer bush 391 and the inner bush 392. 62a and 62b are connected, and the connecting rod 361 is connected to the fourth pivot shaft 94 via the rubber bush 362.

  At the lower end of the connecting rod 361, a mounting hole 361b having the same inner diameter as the bush mounting hole 361a is formed, and a stopper member 396 is fitted into the mounting hole 361b and protrudes inward between the bush mounting hole 361a and the mounting hole 361b. This is a portion in which a stopper 361c is formed integrally.

  The stopper member 396 includes a cylindrical member 397 fitted in the mounting hole 361b, and a stopper rubber 398 adhered to the inside of the cylindrical member 397. The inner diameter of the stopper rubber 398 is the inner cylinder 364 of the rubber bush 362. There is a gap between the stopper rubber 398 and the inner cylinder 364 in a normal state in which a large load is not applied to the rubber bush 362. The rubber bush 362, the stopper member 396, and the stopper 361c constitute a bush / stopper mechanism 399.

24 (a) and 24 (b) are operation diagrams showing the operation of the bush / stopper mechanism according to the present invention.
(A) shows a state in which no load acts between the fourth pivot shaft 94 and the connecting rod 361. The rubber 366 of the rubber bush 362 does not bend, and a gap C1 exists between the stopper rubber 398 of the stopper member 396 and the inner cylinder 364 of the rubber bush 362. Further, there is a gap C2 between the inner peripheral surface 361d of the stopper 361c and the inner cylinder 364, and there is a relationship of C2> C1.

  (B) shows a state in which the fourth pivot shaft 94 is displaced by a displacement amount δ with respect to the connecting rod 361. At this time, the rubber 366 of the rubber bush 362 is bent, the stopper rubber 398 of the stopper member 396 is slightly bent and hits the inner cylinder 364 (that is, C2 = zero), and the inner cylinder 364 hits the stopper 361c and further displacement is restricted. Indicates the state.

Thus, by combining the stopper member 396 with the rubber bush 362, the elastic characteristics can be changed greatly from the middle of the displacement, and the elastic characteristics can be easily changed by, for example, changing the inner diameter of the stopper rubber 398. It is possible to increase the degree of freedom in designing the elastic characteristics.
Further, the stopper 361c can be easily formed by making a hole, and the cost can be reduced.
The stopper 361c may be configured separately from the connecting rod, and may be sandwiched between the rubber bush 362 and the stopper member 396.

  As shown in FIGS. 1, 6, and 7, the present invention firstly includes a power unit 56 integrally including an engine 59 and a rear wheel 14 as a drive wheel, and a pivot plate 31 as a vehicle body. The power unit 56 is swingably suspended on the shaft 32, and one ends of the first links 81, 81 are swingably attached to the pivot plates 31, 32 and the first links 81, 81 extend substantially in the vertical direction. 81, one end of the second link 82 is swingably attached to the other end of the second link 82, and the second link 82 is extended substantially in the front-rear direction, and the power unit 56 is swingably connected to the other end of the second link 82. Specifically, one end of the connecting rod 84 is swingably attached to the inner pivot plate 31b, and the other end of the connecting rod 84 is attached. The power unit 56 is swingably attached, and the inner pivot plate 31b and the connecting rod 84 are provided with a stopper mechanism 105 that restricts the movement of the power unit 56 in the front-rear direction, and a third vehicle body side connecting shaft provided on the connecting rod 84 is provided. A line segment 133 connecting the pivot shaft 93 and the fourth pivot shaft 94 as the power unit side connecting shaft extends in the vertical direction, and the fourth pivot shaft 94 is supported by the connecting rod 84 via the rubber bush 112 as an elastic member. It is characterized by that.

  Thereby, in addition to restricting the movement of the power unit 56 in the front-rear direction by the stopper mechanism 105, the power unit 56 is vertically moved by the elastic force generated when the rubber bush 112 of the fourth pivot shaft 94 provided on the connecting rod 84 is deformed. The movement of the power unit 56 can be regulated, and the power unit 56 can be moved in two directions, the front and rear direction and the vertical direction. Thus, the number of parts can be reduced, and the cost can be reduced.

Secondly, according to the present invention, the connecting rod 84 is provided with an intermediate shaft 95 as a second vehicle body side connecting shaft between the third pivot shaft 93 and the fourth pivot shaft 94, and the fourth pivot shaft 94 is elastic. The power unit 56 is connected through a rubber bush 112 as a member, and the intermediate shaft 95 is connected to the inner pivot plate 31b through a rubber bush 113 as an elastic member.
As a result, the rubber bushings 111 to 113 improve the damper function as compared with the case where the elastic member is single, and can absorb a larger vibration.

  Thirdly, according to the present invention, as shown in FIGS. 5 and 6, the stopper mechanism 105 is provided with a protrusion 84a provided on the connecting rod 84 and a notch provided on the inner pivot plate 31b for inserting the protrusion 84a. And 31c.

  Thus, for example, when the protrusion 84a needs to be replaced due to wear or the like, the stopper mechanism 105 is not only easily replaced as compared with the case where the protrusion 84a is provided on the power unit as in the prior art, but also with a simple structure. Can be provided.

  In the fourth aspect of the present invention, as shown in FIG. 16, the stopper mechanism 266 is moved in a direction different from the third pivot shaft 233 as the vehicle body side connecting shaft of the connecting rod 236 from the fourth pivot shaft 92 as the power unit side connecting shaft. A stopper rubber 237 as an elastic body fixed to the end of the extending portion 236A extending to the main body 26, a main frame 26 as a restricting portion provided on the vehicle body to hit the stopper rubber 237, and a rear wall of the inner pivot plate 231b 231c.

  For example, by changing the shape of the stopper rubber 237 or the hardness of the stopper rubber 237, the amount of swing before and after the power unit 56 can be easily adjusted while the stopper rubber 237 exhibits a buffering and vibration isolating effect. Even when it is desired to secure a large swing amount, it can be easily handled.

Fifthly, the present invention is characterized in that a main stand 61 is provided at the lower part of the power unit 56 as shown in FIGS.
As a result, even when the main stand 61 is erected, the vibration of the power unit 56 can be easily absorbed by the improvement of the damper function by the three rubber bushings 111 to 113 on the connecting rod 84 side, and the vibration transmitted to the body frame 11 can be absorbed. Can be reduced.

  Sixth, the present invention is such that the elastic member is constituted by a rubber bush, and the rubber bush 112 of the fourth pivot shaft 94 is provided with holes 123a and 123b on the upper and lower sides of the fourth pivot shaft 94, compared to the vehicle longitudinal direction. It has a soft property in the vertical direction.

  As a result, the rubber bush 112 of the fourth pivot shaft 94 actively absorbs the vibration caused by the vertical movement of the power unit 56 with a simple structure, making it difficult to transmit the vertical vibration of the power unit 56 to the vehicle body frame 11. it can.

  Seventh, in the present invention, the elastic member is constituted by a rubber bush, and the rubber bush 113 of the intermediate shaft 95 is provided with holes 128a and 128b in the front and rear of the intermediate shaft 95 so that it is softer in the vehicle longitudinal direction than in the vertical direction. It is characterized by having properties.

  As a result, the rubber bush 113 of the intermediate shaft 95 can actively absorb the vibration caused by the back and forth movement of the power unit 56 with a simple structure, making it difficult to transmit the back and forth vibration of the power unit 56 to the vehicle body frame 11.

Eighth, according to the present invention, a line shape 131 is formed by a line segment 131 connecting the third pivot shaft 93 and the intermediate shaft 95 and a line segment 132 connecting the intermediate shaft 95 and the fourth pivot shaft 94. Features.
As a result, the fourth pivot shaft 94 can be disposed away from the vehicle body frame 11, so that the swing amount of the fourth pivot shaft 94 can be set large while preventing interference between the connecting rod 84 and the vehicle body frame 11.

Ninthly, as shown in FIG. 3, the present invention is characterized in that the connecting rod 84 is single and is provided only on one side of the vehicle body frame 11.
Thereby, the link mechanism 105 can be simplified, the number of parts can be reduced, and the cost can be reduced.

Tenth, the present invention is characterized in that the connecting rod 84 is formed by forging.
Thereby, the protrusion 84a of the stopper mechanism 105 can be formed with high strength, and the connecting rod 84 can be reduced in weight.

  In the eleventh aspect of the present invention, as shown in FIG. 9, the fourth pivot shaft 94 is supported by the left arm 175, the right arm 176, and the end arm 178 as a plurality of connection support portions provided in the second link 92. The connecting rod 84 includes a left arm 175 as a first connecting support portion of the plurality of connecting support portions 175, 176, and 178, and an end portion as a second connecting support portion located outside the left arm 175 from the vehicle body. It is characterized in that it is connected to the fourth pivot shaft 94 with being sandwiched between the arms 178.

  Thereby, since the connecting rod 84 is sandwiched and supported by the left arm 175 and the end arm 178, the rigidity of the portion that supports the connecting rod 84 can be increased, and the effect of the connecting rod 84 can be more reliably achieved. Can be demonstrated.

  In the twelfth aspect of the present invention, as shown in FIGS. 23 and 24, a plurality of elastic members interposed between the fourth pivot shaft 94 and the connecting rod 361, that is, a rubber 366 and a stopper rubber 398 are formed. The rubber 366 and the stopper rubber 398 are arranged side by side in the axial direction, and provided between the rubber 366 and the stopper rubber 398 in order to set the deflection amount of the rubber 366 and the stopper rubber 398 to a predetermined value or less. It is provided with a stopper 361c as a restricting means.

  As a result, the deflection amount of the rubber 366 and the stopper rubber 398 can be set with a simple structure, and the deflection amount can be freely changed by changing the shape of the stopper 361c, thereby increasing the degree of freedom in design. it can.

  In the present embodiment, as shown in FIG. 3, the connecting rod 84 is provided on the left side of the vehicle body frame 11, but the present invention is not limited thereto, and may be provided on the right side of the vehicle body frame 11. Furthermore, the holes 123a, 123b, 128a, and 128b can be omitted by changing the spring rates of the rubbers 123 and 128 in the rubber bushes 112 and 113 optimally, and depending on the nature of the vehicle, the holes may be omitted. The part may be unnecessary.

  As shown in FIG. 19, the outer cylinders 327 and 345 are divided into left and right, respectively, but one of the outer cylinders 327 and 345 may be divided into left and right. Further, also in the first embodiment shown in FIG. 8 and the second embodiment shown in FIG. 14, at least one of the outer cylinders 148 and 164 is divided into left and right, and the divided outer cylinders 148 and 164 are connected by a connecting member. May be.

  The power unit suspension device of the present invention is suitable for a scooter type vehicle.

1 is a side view (first embodiment) of a scooter type vehicle including a power unit suspension device according to the present invention. 1 is a first perspective view (first embodiment) showing a central part of a vehicle body frame and a link mechanism of a scooter type vehicle according to the present invention. It is a 2nd perspective view (1st Embodiment) which shows the vehicle body frame center part and link mechanism of the scooter type vehicle which concern on this invention. It is a perspective view (1st Embodiment) which shows the link mechanism which concerns on this invention. It is a perspective view (1st Embodiment) which shows the stopper mechanism of the link mechanism which concerns on this invention. It is a principal part side view (1st Embodiment) which shows the link mechanism which concerns on this invention. It is a side view (1st Embodiment) which shows the link mechanism which concerns on this invention. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 6. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 6. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 6. It is an operation | movement figure (1st Embodiment) which shows the effect | action of the stopper mechanism which concerns on this invention. It is an operation | movement figure (1st Embodiment) which shows the effect | action of the stopper structure by the stopper mechanism and connecting rod which concern on this invention. It is a perspective view (2nd Embodiment) which shows the vehicle body frame center part and link mechanism which concern on this invention. It is a perspective view (2nd Embodiment) which shows the link mechanism which concerns on this invention. It is a principal part side view (2nd Embodiment) which shows the link mechanism which concerns on this invention. It is a side view (2nd Embodiment) which shows the link mechanism which concerns on this invention. FIG. 17 is a cross-sectional view taken along line 17-17 in FIG. 15. It is a perspective view (3rd Embodiment) which shows the link mechanism which concerns on this invention. FIG. 19 is a cross-sectional view taken along line 19-19 in FIG. 18. It is a side view (4th Embodiment) which shows the link mechanism which concerns on this invention. FIG. 21 is a sectional view taken along line 21-21 in FIG. 20 (fourth embodiment). FIG. 22 is a sectional view taken along the line 22-22 in FIG. 20 (fourth embodiment). FIG. 23 is a sectional view taken along line 23-23 in FIG. 20 (fourth embodiment). It is an action figure which shows the effect | action of the bush stopper mechanism which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Scooter type vehicle, 11 ... Car body (body frame), 14 ... Drive wheel (rear wheel), 16A, 16B, 16C ... Power unit suspension device, 26, 231c ... Restriction part (main frame, rear wall), 31c ... Cutting Notch, 55 ... Link mechanism, 56 ... Power unit, 59 ... Engine, 61 ... Main stand, 81, 311 ... First link, 82, 312 ... Second link, 84, 236 ... Connecting rod, 84a ... Projection, 93, 233 ... vehicle body side connecting shaft (third pivot shaft), 94 ... power unit side connecting shaft (fourth pivot shaft), 95 ... second vehicle body side connecting shaft (intermediate shaft), 105, 266 ... stopper mechanism, 111, 112, 113 ... Elastic member (rubber bush), 123a, 123b, 128a, 128b ... Hole, 131, 132, 133 ... Line segment, 175 ... First connection support (left) 178 ... second connection support part (end arm), 236A ... extension part, 237 ... elastic body (stopper rubber), 315 ... connection member, 327 ... first cylindrical tube (outer cylinder), 347 ... Second cylindrical tube (outer cylinder), 361c ... regulating means (stopper), 366, 398 ... elastic member (rubber, rubber for stopper).

Claims (12)

The power unit is integrally provided with an engine and drive wheels, the power unit is swingably suspended on the vehicle body, one end of the first link is swingably attached to the vehicle body, and the first link is extended substantially vertically. One end of the second link is swingably attached to the other end of the first link and the second link is extended substantially in the front-rear direction, and the power unit is swingably connected to the other end of the second link,
One end of a connecting rod is swingably attached to the vehicle body, the power unit is swingably attached to the other end of the connecting rod, and a stopper mechanism that restricts movement of the power unit in the front-rear direction to the vehicle body and the connecting rod And a line segment connecting the vehicle body side connecting shaft and the power unit side connecting shaft provided on the connecting rod is extended in the vertical direction, and the power unit side connecting shaft is supported by the connecting rod via an elastic member. A power unit suspension for a scooter type vehicle.   The connecting rod includes a second vehicle body side connecting shaft between the vehicle body side connecting shaft and the power unit side connecting shaft, the power unit side connecting shaft is connected to the power unit via an elastic member, and the second The power unit suspension device for a scooter type vehicle according to claim 1, wherein the vehicle body side connecting shaft is connected to the vehicle body via an elastic member.   The scooter-type vehicle according to claim 1 or 2, wherein the stopper mechanism includes a protrusion provided on the connecting rod and a notch provided on the vehicle body to insert the protrusion. Power unit suspension system.   The stopper mechanism includes an elastic body fixed to an end of an extending portion that extends in a direction different from the power unit side connecting shaft from the vehicle body side connecting shaft of the connecting rod, and the vehicle body for contacting the elastic body. The power unit suspension device for a scooter type vehicle according to claim 1, wherein the power unit suspension device is configured by a restriction portion provided.   The power unit suspension device for a scooter type vehicle according to any one of claims 1 to 4, wherein a main stand is provided at a lower portion of the power unit.   The elastic member is composed of a rubber bush, and the rubber bush of the power unit side connecting shaft has a soft property in the vertical direction as compared with the longitudinal direction of the vehicle body by providing holes on the upper and lower sides of the power unit side connecting shaft. The power unit suspension device for a scooter type vehicle according to claim 2, 3 or 5.   The elastic member is formed of a rubber bush, and the rubber bush of the second vehicle body side connecting shaft is softer in the vehicle body longitudinal direction than the vertical direction by including holes in the front and rear of the second vehicle body side connecting shaft. The power unit suspension device for a scooter type vehicle according to any one of claims 2, 3, 5, and 6, characterized by having properties.   A line segment connecting the vehicle body side connection shaft and the second vehicle body side connection shaft and a line segment connecting the second vehicle body side connection shaft and the power unit side connection shaft form a dogleg shape. The power unit suspension device for a scooter type vehicle according to any one of claims 2, 3, and 5 to 7.   The power unit suspension device for a scooter type vehicle according to any one of claims 1 to 8, wherein the connecting rod is single and is provided only on one side of the vehicle body.   The power unit suspension device for a scooter type vehicle according to any one of claims 1 to 3, and 5 to 9, wherein the connecting rod is formed by forging. The power unit side connection shaft is supported by a plurality of connection support portions provided in the second link, and the connection rod is connected to the first connection support portion of the connection support portions and the vehicle body outward from the first connection support portion. 11. The power unit suspension device for a scooter type vehicle according to claim 1, wherein the power unit suspension device is sandwiched between a second connection support portion located at a position connected to the power unit side connection shaft.   A plurality of the elastic members interposed between the power unit side connecting shaft and the connecting rod are configured, the elastic members are arranged side by side in the axial direction, and the deflection amount of the elastic member is set to a predetermined value or less. The power unit suspension device for a scooter type vehicle according to any one of claims 1 to 11, further comprising a restricting means provided between the plurality of elastic members.

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