JP6472530B2 - Body frame for motorcycle - Google Patents

Description

  According to the present invention, a hollow is formed by joining a head pipe that steerably supports a steering handle, a down frame that is coupled to the head pipe so as to extend rearwardly downward from the head pipe, and a pressed metal sheet. The present invention relates to a motorcycle body frame including a pair of left and right lower frames that are formed in a shape and are connected to the left and right sides of the lower portion of the down frame and extend rearward.

  A head pipe, a down tube extending downward from the head pipe (corresponding to the down frame of the present application), and a pair of left and right back stays connected to the left and right sides of the lower part of the down tube via connection plates and extending rearward (this application A vehicle body frame for a motorcycle, in which a bracket for supporting a unit swing type power unit on the vehicle body frame side is fixed to a rear end portion of a backstay. Already known at 1.

Japanese Unexamined Patent Publication No. 2003-104267

  However, the one disclosed in Patent Document 1 requires an operation of fixing a large bracket, which is a separate member from the backstay, to the backstay, which increases the number of processing steps of the body frame and increases the weight of the body frame. Is invited.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a motorcycle body frame capable of supporting a unit swing type power unit while avoiding processing man-hours and an increase in weight.

  In order to achieve the above object, the present invention provides a head pipe that steerably supports a steering handle, a down frame coupled to the head pipe so as to extend rearwardly from the head pipe, and press working A motorcycle body frame comprising a pair of left and right lower frames connected to both left and right sides of the lower part of the down frame and extending rearward, and formed in a hollow shape by joining the formed metal plates, and a rear end of the lower frame A link support part that forms an opening that opens rearward and downward is formed integrally with the part, and one end of a suspension link that is connected to a unit swing type power unit is inserted into the opening and The first feature is that the link support part is rotatably supported.

  According to the present invention, in addition to the structure of the first feature, a rise frame extending rearward is integrally connected to a rear end portion of the lower frame, and a lower portion of the lower frame and the connection portion of the rise frame. The second feature is that the link support portion is formed.

  In the present invention, in addition to the configuration of the second feature, the link support portion is formed at the rear end portion of the lower frame in front of a virtual extension line to the lower side of the rear surface of the rise frame in a side view. This is the third feature.

  In the present invention, in addition to any one of the first to third features, the link support portion is closer to the vehicle width direction than the lower frame main portion which is a portion of the lower frame excluding the link support portion A reinforcing plate having a closing plate portion that closes the opening is formed so that a stepped portion is formed between the lower frame main portion and the width, while the insertion end is restricted by the stepped portion. A fourth feature is that one end of the suspension link inserted into the opening and fitted in the reinforcing plate is rotatably supported by a support shaft penetrating the link supporting portion and the reinforcing plate. And

  Furthermore, in addition to any of the configurations of the first to fourth features, the present invention is a joint in which the lower frame projects toward at least one of the upper and lower sides in a direction orthogonal to the rotation axis of the suspension link. A fifth feature is that it is formed in a cylindrical shape having a rectangular cross section while having a collar portion.

  According to the first feature of the present invention, the link support portion is integrally formed at the rear end portion of the lower frame formed in a hollow shape by joining the pressed metal sheets, and is connected to the unit swing type power unit. Since one end of the suspension link is inserted into the opening of the link support and is pivotally supported by the link support, it is not necessary to fix the large bracket to the lower frame. A unit swing type power unit can be supported at the rear end of the lower frame while avoiding an increase in weight.

  Further, according to the second feature of the present invention, the link support portion is formed at a lower portion of the integrally connected portion of the lower frame and the rise frame extending rearwardly from the lower frame. Can be easily secured behind the lower frame.

  According to the third feature of the present invention, since the link support portion is in front of the virtual extension line to the lower side of the rear surface of the rise frame in a side view, the link support portion from the front end portion of the rise frame to the rear is provided. Protruding can be suppressed and the weight of the body frame can be reduced.

  According to the fourth feature of the present invention, the link support portion is formed with a width in the vehicle width direction wider than the lower frame main portion which is a portion excluding the link support portion. Therefore, it is possible to secure the support rigidity of the suspension link by widening only the link support portion. A reinforcing plate having a closing plate portion that closes the opening portion of the link support portion is inserted into the opening portion so that the insertion end is regulated at the step portion between the link support portion and the lower frame main portion, and is inserted into the reinforcing plate. Since one end of the suspended link to be fitted is rotatably supported by a support shaft that penetrates the link support and the reinforcing plate, the support rigidity at the link support at the rear end of the lower frame is more enhanced by the reinforcing plate. Can be increased.

  Furthermore, according to the fifth feature of the present invention, the lower frame is formed in a cylindrical shape having a rectangular cross section with a joint flange projecting in a direction perpendicular to the rotation axis of the suspension link. With this structure, the link support portion can be formed while not interfering with the joint flange portion of the lower frame.

FIG. 1 is a right side view of the vehicle body frame. (First embodiment) FIG. 2 is a view of the body frame excluding the head pipe as seen from the direction of the arrow 2 in FIG. (First embodiment) FIG. 3 is a right side view of the scooter type motorcycle. (First embodiment) 4 is a view taken in the direction of arrow 4 in FIG. (First embodiment) 5 is a cross-sectional view taken along line 5-5 of FIG. (First embodiment)

16 ... Steering handle 17 ... Head pipe 18 ... Down frame 19 ... Lower frame 19a ... Lower frame main part 19c ... Step part 20 ... Rise frame 25 ... Suspension Link 45, 46 ... Joint flange 47 ... Link support part 48 ... Opening part 51 ... Supported part 58 which is one end part of suspension link ... Reinforcement plate 58a ... Closure plate part 59... Bolt F as a support shaft... Body frame L... Virtual extension line P to the lower side of the rear surface of the rise frame.

  Embodiments of the present invention will be described below with reference to FIGS. In the following description, the front and rear, the top and bottom, and the left and right directions are directions as viewed from the occupant riding the motorcycle.

First embodiment

  1 and 2, a body frame F of a scooter type motorcycle includes a head pipe 17 on which a front fork 15 supporting a front wheel WF and a rod-shaped steering handle 16 are supported so as to be steerable, and a head pipe. A down frame 18 coupled to the head pipe 17 so as to extend rearwardly downward from 17, a pair of left and right lower frames 19 connected to the left and right sides of the lower part of the down frame 18 and extending rearward, and the lower frames 19 A pair of left and right rise frames 20 that are integrally connected to the rear ends and extend rearwardly, a first cross member 21 provided between the rear portions of the pair of left and right lower frames 19, and the rear portions of the pair of left and right rise frames 20 And a second cross member 22 provided.

  In FIG. 3, a unit swing type power unit P is swingably connected to the lower frame 19 in the vehicle body frame F via a suspension link 25, and a rear wheel WR is pivotally supported on a rear portion of the power unit P. . A rear cushion unit 26 is provided between the rear portion of the rise frame 20 and the power unit P.

  Above the power unit P, a tandem riding seat 28 is disposed so as to be openable and closable by a pair of left and right rise frames 20, and for the riding in a state in which a storage box (not shown) is closed. It is fixedly arranged between the power unit P and the riding seat 28 so as to be covered with the seat 28 from above.

  The vehicle body frame F, a part of the power unit P, and the storage box are covered with a vehicle body cover 30. The vehicle body cover 30 covers a front cover 31 that covers the head pipe 17 from the front, and the front cover 31. A leg shield 32 that is continuously provided and covers a leg portion of an occupant sitting on the riding seat 28 from the front, and a lower part of the leg shield 32 that the occupant sitting on the riding seat 28 rests on the foot. A step floor 33 disposed on the lower frame 19, a pair of left and right skirt portions 34 depending downward from both sides of the step floor 33, and a front lower portion of the riding seat 28. A center cowl 35 that covers the storage box from the front, and the rise frame 20 and the front under the riding seat 28. Comprising part of the power unit P and side covers 36 covering the lateral side, a rear cover 37 disposed at the rear below the provided continuously to the left and right side covers 36 and two side covers 36.

  A central portion of the steering handle 16 in the vehicle width direction is covered with a handle cover 38. A front fender 39 that covers the front wheel WF from above is attached to the front fork 15, and a rear fender 40 that covers the rear wheel WR from above is connected to the rear cover 37.

  The down frame 18 is formed in a hollow shape by joining pressed metal sheets. That is, the down frame 18 is formed in a hollow shape by joining metal plates so as to have a cylindrical shape with a rectangular cross section while having a joint flange portion 42 protruding forward, and the front end portion of the down frame 18 is The bolts 43 and nuts 44 are respectively fastened to the rear portion of the head pipe 17 at two positions spaced vertically, and the front end portions of the lower frame 19 are joined to the left and right side surfaces of the lower portion of the down frame 18. .

  Referring to FIGS. 4 and 5 together, the lower frame 19 and the rise frame 20 are formed in a hollow shape by joining pressed metal sheets. That is, the lower frame 19 and the rise frame 20 are formed in a cylindrical shape having a rectangular cross section while having an upper joint flange 45 projecting upward and a lower joint collar 46 projecting downward. It is formed in a hollow shape by joining a pair of left and right metal plates.

  At the rear end of the lower frame 19, a link support portion 47 that forms an opening 48 opened rearward and downward is integrally formed, and one end of the suspension link 25 connected to the unit swing type power unit P. The portion is inserted into the opening 48 and supported by the link support portion 47 so as to be rotatable.

  In addition, a rise frame 20 that extends rearward is integrally connected to the rear end portion of the lower frame 19, and the link support portion 47 is formed below the connection portion of the lower frame 19 and the rise frame 20. It is formed.

  The link support portion 47 has a pair of left and right mounting plates 19b that are integral with the left and right side plates of the lower frame 19, and the width between the mounting plates 19b, that is, the link support portion 47 in the vehicle width direction. The width W is set to be wider than the width of the lower frame main portion 19a, which is a portion of the lower frame 19 excluding the link support portion 47, and the mounting plate 19b, that is, the link support portion 47 is formed of the lower frame main portion 19a. A substantially C-shaped stepped portion 19c that opens obliquely downward and rearward is formed between the portion 19a and the portion 19a.

  In addition, as clearly shown in FIGS. 1 and 5, the link support portion 47 is located at the rear end portion of the lower frame 19 in front of a virtual extension line L to the lower side of the rear surface of the rise frame 20 in a side view. It is formed.

  The suspension link 25 is fixed to a front link 49 that is rotatably supported by a pair of left and right link support portions 47 and a vehicle width center portion of the front link 49 so as to be connected to the power unit P. The rear link 50 is configured.

  The front link 49 is provided at both ends of a pipe 52 formed in a substantially U-shape in which a supported portion 51 that is rotatably supported by a pair of left and right link support portions 47 is opened forward. Made up. Further, the rear link 50 is provided with a connecting cylinder 54 for connecting the power unit P between a pair of left and right support plates 53 fixed to the pipe 52.

  As clearly shown in FIG. 5, the supported portion 51 includes an outer cylinder 55 fixed to an end of the pipe 51, an inner cylinder 56 disposed coaxially within the outer cylinder 55, and the outer cylinder 55. And a damper rubber 57 provided between the inner cylinders 56, and the supported portion 51 at one end of the suspension link 25 is inserted into the opening 48 and supported rotatably by the link support portion 47. Is done.

  A reinforcing plate 58 is inserted into the opening 48. The reinforcing plate 48 includes a closing plate portion 58a having a substantially C-shaped cross section so as to close the opening portion 48, and a pair of left and right side plate portions provided at right angles to both sides of the closing plate portion 58a. 58b integrally formed. The reinforcing plate 58 is inserted into the opening portion 48 so that the side plate portion 58b is in contact with the inner surface of the mounting plate portion 19b of the link support portion 47 and the insertion end is restricted by the step portion 19c. Is done. The supported portion 51 at one end of the suspension link 25 is fitted into the reinforcing plate 58 so that both ends of the outer cylinder 55 and the inner cylinder 56 are in sliding contact with the side plate portion 58b of the reinforcing plate 48. Then, the supported portion 51 fitted in the reinforcing plate 58 is rotatably supported by a bolt 59 that is a support shaft that penetrates the link supporting portion 47 and the reinforcing plate 58.

  That is, the bolt 59 penetrates the link support part 47 and the reinforcing plate 58 from one side in the vehicle width direction so as to penetrate the inner cylinder 56 in the supported part 51, from the link support part 47. A nut 60 is screwed onto the bolt 59 protruding to the other side in the vehicle width direction.

  By the way, the lower frame 19 has an upper and lower joint flanges 45 and 46 projecting toward at least one of the upper and lower sides (both in this embodiment) and is formed in a cylindrical shape having a rectangular cross section. The joint flanges 45, 46 protrude upward and downward in a direction perpendicular to the rotation axis of the suspension link 25, that is, the central axis of the bolt 59.

  Next, the operation of this embodiment will be described. A pair of left and right sides that are formed in a hollow shape by joining pressed metal plates on the left and right sides of the lower part of the down frame 18 that extends rearwardly downward from the head pipe 17 and extend rearward. The lower frame 19 is connected, and at the rear end of the lower frame 19, a link support portion 47 that forms an opening 48 opened rearward and downward is integrally formed. Since the supported portion 51 at one end of the suspension link 25 to be connected is inserted into the opening 48 and is rotatably supported by the link support portion 47, a large bracket is fixed to the lower frame 19. The rear end of the lower frame 19 with the unit swing type power unit P while avoiding an increase in processing man-hours and weight. It can be supported.

  A rise frame 20 extending rearward is integrally connected to the rear end portion of the lower frame 19, and the link support portion 47 is formed below the lower frame 19 and the connection portion of the rise frame 20. Therefore, the swinging space of the suspension link 25 can be easily secured behind the lower frame 19.

  Further, since the link support portion 47 is formed at the rear end portion of the lower frame 19 in front of the virtual extension line L to the lower side of the rear surface of the rise frame 20 in a side view, the front end portion of the rise frame 20 Thus, the protrusion of the link support portion 47 from the rear to the rear can be suppressed, which contributes to the weight reduction of the vehicle body frame F.

  Further, the link support portion 47 is located between the lower frame main portion 19a while making the width W in the vehicle width direction wider than the lower frame main portion 19a which is a portion excluding the link support portion 47 in the lower frame 19. Since the step portion 19c is formed on the lower frame 19, only the link support portion 47 is widened to ensure the support rigidity of the suspension link 25 without widening the entire lower frame 19.

  A reinforcing plate 58 having a closing plate portion 58a for closing the opening portion 48 is inserted into the opening portion 48 so that an insertion end thereof is restricted by the step portion 19c, and is fitted into the reinforcing plate 58. Since the supported portion 51 at one end of the suspension link 25 is rotatably supported by a bolt 59 that passes through the link support 47 and the reinforcing plate 58, the link support 47 at the rear end of the lower frame 19 is supported. The support rigidity at can be further increased by the reinforcing plate 58.

  Further, the lower frame 19 has upper and lower joint flanges 45 and 46 projecting toward at least one of the upper and lower sides (both in this embodiment) in a direction perpendicular to the rotation axis of the suspension link 25. However, since it is formed to have a cylindrical shape with a rectangular cross section, the link support portion 47 can be formed with a simplified structure while preventing interference with the joint flange portions 45 and 46 of the lower frame 19.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist thereof.

Claims (5)

  A head pipe (17) that supports the steering handle (16) in a steerable manner; and a down frame (18) coupled to the head pipe (17) so as to extend rearwardly downward from the head pipe (17). A motorcycle body comprising a pair of left and right lower frames (19) formed in a hollow shape by joining pressed metal plates and connected to the left and right sides of the lower portion of the down frame (18) and extending rearward. In the frame, a link support part (47) forming an opening part (48) opened rearward and downward is integrally formed at the rear end part of the lower frame (19), and a unit swing type power unit (P ), One end (51) of the suspension link (25) is inserted into the opening (48) and can be rotated by the link support (47). A body frame for a motorcycle characterized in that it is supported.   A rise frame (20) extending rearward is integrally connected to a rear end portion of the lower frame (19), and the lower frame (19) and a lower portion of the connection portion of the rise frame (20) are connected to the lower frame (19). The body frame for a motorcycle according to claim 1, wherein a link support portion (47) is formed.   The link support portion (47) is formed at the rear end portion of the lower frame (19) in front of a virtual extension line (L) to the lower side of the rear surface of the rise frame (20) in a side view. The vehicle body frame for a motorcycle according to claim 2.   The link support portion (47) has a width (W) in the vehicle width direction wider than a lower frame main portion (19a) which is a portion excluding the link support portion (47) in the lower frame (19). A reinforcing plate (58) having a closing plate portion (58a) for closing the opening (48) is formed so that a step portion (19c) is formed between the lower frame main portion (19a) and the step portion (19a). 19c) is inserted into the opening (48) in such a manner that its insertion end is restricted, and one end (51) of the suspension link (25) fitted into the reinforcing plate (58) is connected to the link. The vehicle body for a motorcycle according to any one of claims 1 to 3, wherein the vehicle body is rotatably supported by a support shaft (59) passing through the support portion (47) and the reinforcing plate (58). flame.   The lower frame (19) has a joint section (45, 46) projecting toward at least one of the upper and lower sides in a direction orthogonal to the rotation axis of the suspension link (25) and having a rectangular cross section. The motorcycle body frame according to any one of claims 1 to 4, wherein the motorcycle body frame is formed in a cylindrical shape.

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