JP4748786B2

JP4748786B2 - Shaft drive driven motorcycle and gear housing setting method

Info

Publication number: JP4748786B2
Application number: JP2005301921A
Authority: JP
Inventors: 純由井薗; 彰利中島; 拓也花野
Original assignee: Yamaha Motor Co Ltd
Current assignee: Yamaha Motor Co Ltd
Priority date: 2005-10-17
Filing date: 2005-10-17
Publication date: 2011-08-17
Anticipated expiration: 2025-10-17
Also published as: JP2007106363A

Description

本発明は、シャフトドライブ機構を備えたシャフトドライブ駆動式自動二輪車に関し、詳しくは、シャフトドライブ機構を構成するギアハウジングとその組立てならびにセット方法に関する。 The present invention relates to a shaft drive drive type motorcycle equipped with a shaft drive mechanism, and more particularly to a gear housing constituting the shaft drive mechanism and an assembly and setting method thereof.

シャフトドライブ駆動式の自動二輪車では、後輪（駆動輪）の一方の側面にギアハウジング（ギアボックス又はギアケースともいう。）が構築されている。ギアハウジングは、車体の動力源（エンジン、モータ等）に繋がるドライブシャフトの先端部に連結した駆動ギア（一般的には小径ベベルギア）と、動力をドライブシャフトから後輪に伝える伝達ギア（一般的には大径ベベルギア）とを噛合した状態で収容する部材であり、これらギアを回転可能に支持する軸受を備えている。
例えば、特許文献１には、従来の典型的なシャフトドライブ機構とギアハウジング（ギアケース）が記載されている。 In a shaft drive type motorcycle, a gear housing (also referred to as a gear box or a gear case) is constructed on one side surface of a rear wheel (drive wheel). The gear housing consists of a drive gear (typically a small-diameter bevel gear) connected to the tip of the drive shaft that connects to the power source (engine, motor, etc.) of the vehicle body, and a transmission gear (generally used for transmitting power from the drive shaft to the rear wheels). Is a member that accommodates a large-diameter bevel gear) and includes a bearing that rotatably supports these gears.
For example, Patent Document 1 describes a conventional typical shaft drive mechanism and a gear housing (gear case).

実開昭６２−１２７０９２号公報Japanese Utility Model Publication No. 62-127092

ところで、自動二輪車の運動性能や操縦性を向上させるためには、車両重心付近に重量物をまとめ、更には前輪荷重割合を高めることが好ましい。シャフトドライブ駆動式の二輪車でも事情は同じであり、そのためにはギアハウジングの軽量化やスモールサイズ化が好ましいが、安易な軽量化、小サイズ化はシャフトドライブ機構自体の強度、及び信頼性の低下を招くため好ましくない。 By the way, in order to improve the motor performance and maneuverability of the motorcycle, it is preferable to gather heavy objects near the center of gravity of the vehicle and further increase the front wheel load ratio. The situation is the same for a shaft drive type motorcycle. For this purpose, it is preferable to make the gear housing lighter or smaller. However, easy weight reduction and size reduction reduce the strength and reliability of the shaft drive mechanism itself. This is not preferable.

そこで本発明は、上記自動二輪車の性能向上に資するべく創出されたものであり、シャフトドライブ機構の信頼性を損なうことなく小サイズ化（好ましくはさらに軽量化）を実現し得る構成のギアハウジングを提供することを目的の一つとする。また、他の一つの目的は、そのようなギアハウジングを備えた自動二輪車を提供することである。また、他の一つの目的は、そのようなギアハウジングを組立てる方法、さらに組み立てたギアハウジングを所定位置にセットする方法を提供することである。 Accordingly, the present invention was created to contribute to the improvement of the performance of the motorcycle described above, and a gear housing having a configuration capable of realizing a reduction in size (preferably further reduction in weight) without impairing the reliability of the shaft drive mechanism. One of the purposes is to provide. Another object is to provide a motorcycle equipped with such a gear housing. Another object is to provide a method for assembling such a gear housing and a method for setting the assembled gear housing in place.

前記目的を達成するため本発明により提供される自動二輪車は、シャフトドライブ機構を備える自動二輪車である。そして、車体フレームと、前記車体フレームに連結されるアーム部材と、動力源（典型的にはエンジン及び／又はモータ）からの動力を伝達するドライブシャフトと、前記ドライブシャフトに連結される駆動ギアと、前記駆動ギアと噛み合って動力を後輪に伝える伝達ギアと、前記駆動ギアと伝達ギアとが相互に噛合した状態でその内部に配置されるギアハウジングと、前記アーム部材及び／又は前記ギアハウジングに支持される車軸と、前記車軸に回転可能に取り付けられる後輪とを備える。
好ましくは、前記伝達ギアは、前記車軸を中心として回転可能に後輪に取り付けられている。また、前記ギアハウジングは、前記伝達ギアを回転可能に支持する第１の軸受を備えており、その第１の軸受は前記駆動ギアに近接した位置であって、該駆動ギアの側端よりも車体側面側外方に配置されていることを特徴とする。 To achieve the above object, the motorcycle provided by the present invention is a motorcycle including a shaft drive mechanism. A body frame; an arm member coupled to the body frame; a drive shaft for transmitting power from a power source (typically an engine and / or a motor); and a drive gear coupled to the drive shaft. A transmission gear that meshes with the drive gear and transmits power to a rear wheel, a gear housing that is arranged in the state where the drive gear and the transmission gear mesh with each other, and the arm member and / or the gear housing. And an axle supported by the axle and a rear wheel rotatably attached to the axle.
Preferably, the transmission gear is attached to a rear wheel so as to be rotatable about the axle. In addition, the gear housing includes a first bearing that rotatably supports the transmission gear, and the first bearing is located near the drive gear and is closer to the side end of the drive gear. It is arranged outside the vehicle body side.

このような構成のギアハウジングでは、上記第１の軸受（ベアリング）が、駆動ギアよりも車体側面（典型的には後輪側面方向であってギアハウジングの設けられている側の側面）の外方に配置される。これにより、駆動ギアの先端と伝達ギアを支持する当該第１の軸受（以下「外方軸受」ともいう。）との接触を防止しつつ、当該第１の軸受（外方軸受）と駆動ギアとの車両前後方向の距離を縮めることができる。
この距離を縮めることによって、軸受それ自体の機能を損なうことなく、ギアハウジングのサイズを小さくすることができる。また、小径化は軽量化にも繋がり、車両中央部へのマス集中及び前輪荷重の増大に寄与することができる。従って、例えば図１で示されるＶ型エンジン搭載自動二輪車のように、前輪荷重が軽くなりがちな構成の自動二輪車への本発明のギアハウジングの適用は好ましい。 In the gear housing having such a configuration, the first bearing (bearing) is located outside of the side surface of the vehicle body (typically the side surface on the side where the gear housing is provided in the direction of the rear wheel side) with respect to the drive gear. Placed in the direction. Thus, the first bearing (outer bearing) and the drive gear are prevented while preventing contact between the front end of the drive gear and the first bearing supporting the transmission gear (hereinafter also referred to as “outer bearing”). The distance in the vehicle front-rear direction can be reduced.
By reducing this distance, the size of the gear housing can be reduced without impairing the function of the bearing itself. Further, the reduction in diameter also leads to weight reduction, which can contribute to mass concentration at the vehicle center and an increase in front wheel load. Therefore, for example, the gear housing of the present invention is preferably applied to a motorcycle having a configuration in which the front wheel load tends to be light, such as a V-type engine-equipped motorcycle shown in FIG.

好ましい一態様では、前記駆動ギアは、その歯当たり面の先端を越える位置で軸受（以下「第３の軸受」ともいう。）を介してギアハウジングに支持されており、前記第１の軸受（外方軸受）は、当該第３の軸受に対し車両前後方向で重複（オーバーラップ）させて配置されている。
このような配置により、ギアハウジングの更なる小サイズ化、軽量化を実現することができる。 In a preferred embodiment, the drive gear is supported by a gear housing via a bearing (hereinafter also referred to as “third bearing”) at a position beyond the tip of the tooth contact surface, and the first bearing ( The outer bearing) is arranged so as to overlap (overlap) the third bearing in the vehicle front-rear direction.
With such an arrangement, the gear housing can be further reduced in size and weight.

好ましい他の一態様では、前記伝達ギアにおける前記駆動ギアと噛合して回転する歯当たり面の背面に近接する位置に、該伝達ギアを回転可能に支持する軸受（以下「第２の軸受」ともいう。）が更に配置されている。
このような位置に軸受を配置し且つ伝達ギアを当該第２の軸受にて回転可能に支持することによって、当該伝達ギアに発生するスラスト力（軸方向力）を当該軸受で受けることができる。これにより、当該伝達ギアの回転軸方向への振れやずれを抑え、信頼性の高いシャフトドライブ機構を実現することができる。 In another preferred aspect, a bearing (hereinafter referred to as “second bearing”) that rotatably supports the transmission gear at a position close to the back surface of the tooth contact surface that meshes with and rotates with the drive gear. Is further arranged.
By disposing the bearing at such a position and rotatably supporting the transmission gear with the second bearing, a thrust force (axial force) generated in the transmission gear can be received by the bearing. As a result, it is possible to suppress a shake or shift of the transmission gear in the rotation axis direction, and to realize a highly reliable shaft drive mechanism.

特に好ましくは、前記第１の軸受及び／又は第２の軸受はボールベアリングである。かかる構成によると、伝達ギアに発生するスラスト力を当該軸受で確実に受けることができる。 Particularly preferably, the first bearing and / or the second bearing are ball bearings. According to such a configuration, the thrust force generated in the transmission gear can be reliably received by the bearing.

好ましい他の一態様では、前記ギアハウジングは前記第１の軸受を車体側面外方から車軸に沿って車幅中心側に押圧する軸受押圧部材を備える。
このような軸受押圧部材を備えることによって、外方軸受の車体側面外方からの配置と固定、延いてはギアハウジングの構築が容易に行われる。 In another preferred aspect, the gear housing includes a bearing pressing member that presses the first bearing from the outer side of the vehicle body to the vehicle width center side along the axle.
By providing such a bearing pressing member, the outer bearing can be easily arranged and fixed from the outside of the side of the vehicle body, and thus the gear housing can be easily constructed.

また、特に好ましい一態様では、前記車軸の一端には雄ねじが形成されており、前記軸受押圧部材には、前記車軸の雄ねじが螺合する雌ねじが形成されている。
このような構成の軸受押圧部材と車軸が使用されることにより、外方軸受の固定と車軸（即ち後輪を貫通している状態のもの）及び後輪の組付けと固定を同時に行うことができる。また、車軸固定のための部材（例えば固定用ナット）を省くことができるため、ギアハウジングの小サイズ化、軽量化をさらに向上させることができる。 In a particularly preferred aspect, a male screw is formed at one end of the axle, and a female screw into which the male screw of the axle is screwed is formed on the bearing pressing member.
By using the bearing pressing member and the axle having such a configuration, the outer bearing can be fixed and the axle (that is, the state passing through the rear wheel) and the rear wheel can be assembled and fixed simultaneously. it can. Further, since a member for fixing the axle (for example, a fixing nut) can be omitted, the size reduction and weight reduction of the gear housing can be further improved.

また、ここで開示される技術によると、従来よりも小サイズ化（さらに好ましくは軽量化）を実現したシャフトドライブ機構のギアハウジングを組立て、そして当該ギアハウジングを所定の位置にセットすることができる。
従って、本発明は他の側面として、ドライブシャフトに連結される駆動ギアと該駆動ギアから伝達される動力を後輪に伝える伝達ギアとが相互に噛合された状態で配置されるギアハウジングを組立て、セットする方法を提供する。
ここで開示されるギアハウジングのセット方法は、前記駆動ギアと伝達ギアとを相互に噛合させた状態でギアハウジング構成部材（一つとは限らず複数の構成部材であり得る）に組み付けてギアハウジングを組立てる第１の工程（即ち本発明によって提供されるギアハウジング組立て方法に相当する）と、車軸を中心に前記伝達ギアが回転可能なように、前記ギアハウジング構成部材に後輪を取り付ける第２の工程と、車軸を中心に前記伝達ギアが回転可能なように、前記ギアハウジング構成部材に後輪が取り付けられた組立て体に、該車軸を取り付ける第３の工程とを包含する。
そして、前記第１の工程は、前記伝達ギアが第１の軸受（外方軸受）によって回転可能に支持されるように、且つ、該第１の軸受が前記駆動ギアに近接した位置であって該駆動ギアの側端よりも車体側面側外方に配置されるように、該第１の軸受（外方軸受）を含むギアハウジング構成部材（一つとは限らず複数の構成部材であり得る）を車体側面方向から組み付けることを含む。
ここで開示されるギアハウジングセット方法によると、軸受それ自体の機能を損なうことなく、小径化及び軽量化に適するギアハウジングを組み立て、所定位置にセットすることができる。このため、車両中央部へのマス集中及び前輪荷重の増大に寄与することができる。例えば図１で示されるＶ型エンジン搭載自動二輪車に好適なギアハウジングを組立てる（製造する）ことができる。 Further, according to the technology disclosed herein, it is possible to assemble the gear housing of the shaft drive mechanism that achieves a smaller size (more preferably lighter) than the conventional one, and set the gear housing at a predetermined position. .
Therefore, according to another aspect of the present invention, a gear housing is assembled in which a drive gear coupled to a drive shaft and a transmission gear that transmits power transmitted from the drive gear to the rear wheels are engaged with each other. Provide a way to set.
In the gear housing setting method disclosed herein, the drive gear and the transmission gear are engaged with each other in a state in which the drive gear and the transmission gear are engaged with each other. And a second step of attaching a rear wheel to the gear housing component so that the transmission gear can rotate about an axle. And a third step of attaching the axle to an assembly in which a rear wheel is attached to the gear housing component so that the transmission gear can rotate about the axle.
In the first step, the transmission gear is rotatably supported by a first bearing (outer bearing), and the first bearing is in a position close to the drive gear. A gear housing component including the first bearing (outer bearing) so as to be disposed on the outer side of the vehicle body side with respect to the side end of the drive gear (not limited to one, but may be a plurality of components) Assembly from the side of the vehicle body.
According to the gear housing setting method disclosed herein, a gear housing suitable for reduction in diameter and weight can be assembled and set at a predetermined position without impairing the function of the bearing itself. For this reason, it can contribute to the increase of the mass concentration to the vehicle center part and the front wheel load. For example, a gear housing suitable for the V-type engine-equipped motorcycle shown in FIG. 1 can be assembled (manufactured).

ここで開示されるギアハウジングセット方法の好適な一態様では、前記第１の工程は、前記駆動ギアを歯当たり面の先端を越える位置で軸受（第３の軸受）を介してギアハウジングに支持し、前記第１の軸受（外方軸受）を該第３の軸受に対し車両前後方向で重複（オーバーラップ）させて配置することを含む。
この態様の方法によると、より小サイズのギアハウジングを組立て、セットすることができる。 In a preferred aspect of the gear housing setting method disclosed herein, in the first step, the drive gear is supported on the gear housing via a bearing (third bearing) at a position beyond the tip of the tooth contact surface. And arranging the first bearing (outer bearing) so as to overlap (overlap) the third bearing in the vehicle front-rear direction.
According to the method of this aspect, a smaller gear housing can be assembled and set.

ここで開示されるギアハウジングセット方法の好適な他の一態様では、前記第１の工程は、前記伝達ギアにおける前記駆動ギアと噛合して回転する歯当たり面の背面に近接する位置に、該伝達ギアを回転可能に支持する軸受（第２の軸受）を配置することを含む。
この態様の方法によると、当該伝達ギアの回転軸方向への振れやずれを抑え、より高い信頼性のギアハウジング（延いてはシャフトドライブ機構）を形成することができる。 In another preferable aspect of the gear housing setting method disclosed herein, the first step is performed at a position close to the back surface of the tooth contact surface that meshes with the drive gear and rotates. Disposing a bearing (second bearing) that rotatably supports the transmission gear.
According to the method of this aspect, the transmission gear can be prevented from swinging and shifting in the direction of the rotation axis, and a more reliable gear housing (and thus a shaft drive mechanism) can be formed.

ここで開示されるギアハウジングセット方法の好適な他の一態様では、車体側面外方から軸受押圧部材をギアハウジングに組み付けることにより、前記第１の軸受（外方軸受）を前記車軸に沿って車幅中心側に押圧することを含む。
この態様の方法によると、軸受押圧部材を使用することによって、外方軸受の車体側面外方からの配置と所望する部位での固定を容易に行うことができる。延いては、ギアハウジングの組立て（構築）とセットが容易となる。 In another preferred aspect of the gear housing setting method disclosed herein, the first bearing (outer bearing) is moved along the axle by assembling a bearing pressing member to the gear housing from the outside of the vehicle body side surface. Including pressing toward the center of the vehicle width.
According to the method of this aspect, by using the bearing pressing member, it is possible to easily dispose the outer bearing from the outside of the side surface of the vehicle body and fix it at a desired portion. As a result, the assembly (construction) and setting of the gear housing is facilitated.

ここで開示されるギアハウジングセット方法の特に好適な一態様では、前記車軸の一端には雄ねじが形成されており、前記軸受押圧部材には雌ねじが形成されており、前記押圧とともに後輪に装着された前記車軸の雄ねじを前記雌ねじに螺合させることを含む。
この態様の方法によると、上記構成の軸受押圧部材と車軸を使用することによって、外方軸受の固定と車軸及び後輪の組付けと固定を同時に行うことができる。このため、ギアハウジングの組立て及びセットと後輪の組付け（即ちシャフトドライブ機構を備えた自動二輪車の足回り）を効率よく構築することができる。また、車軸固定のための部材（例えば固定用ナット）を省くことができるため、ギアハウジングの小サイズ化、軽量化をさらに向上させ、製造コスト削減を図ることができる。 In a particularly preferred aspect of the gear housing setting method disclosed herein, a male screw is formed on one end of the axle, and a female screw is formed on the bearing pressing member. Screwing the male screw of the axle to the female screw.
According to the method of this aspect, by using the bearing pressing member and the axle configured as described above, the outer bearing can be fixed and the axle and the rear wheel can be assembled and fixed simultaneously. For this reason, the assembly and set of the gear housing and the assembly of the rear wheel (that is, the suspension of the motorcycle equipped with the shaft drive mechanism) can be efficiently constructed. Further, since a member for fixing the axle (for example, a fixing nut) can be omitted, the reduction in size and weight of the gear housing can be further improved, and the manufacturing cost can be reduced.

本発明を実施する車両として好適な自動二輪車とは、モーターサイクルの意味であり、原動機付自転車（モーターバイク）、スクーターを含む。車体を傾動させて旋回可能な車両（いわゆる鞍乗り型車両）はここでいう自動二輪車に包含され得る。前輪および後輪の少なくとも一方を２輪以上にして、単にタイヤの数のカウントで三輪車・四輪車（またはそれ以上）と呼ばれるものも本発明の実施に支障がない限り、ここでいう「自動二輪車」に包含され得る。
以下、本発明の好適な実施形態を図面を参照しつつ説明するが、本発明をかかる具体例に限定することを意図したものではない。本実施形態に係る自動二輪車は、以下に説明するシャフトドライブ機構（特にギアハウジングの構成）以外の構成に関しては従来の自動二輪車と同様でよく、そのような従来技術の詳細な説明は省略する。 A motorcycle suitable as a vehicle for carrying out the present invention means a motorcycle, and includes a motorbike and a scooter. A vehicle that can turn by tilting the vehicle body (a so-called saddle-ride type vehicle) can be included in the motorcycle here. As long as at least one of the front wheels and the rear wheels is two or more and is simply called a tricycle / four-wheel vehicle (or more) by counting the number of tires, as long as there is no problem in the implementation of the present invention, It can be included in a “motorcycle”.
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings, but the present invention is not intended to be limited to these specific examples. The motorcycle according to the present embodiment may be the same as that of the conventional motorcycle except for the shaft drive mechanism (particularly, the configuration of the gear housing) described below, and a detailed description of such prior art will be omitted.

図１は、シャフトドライブ機構を備えた自動二輪車１０の側面図である。この図に示すように、本実施形態に係る自動二輪車１０は、大まかにいって、車体フレーム１１に枢支されたフロントフォーク１２と、該フロントフォーク１２の下端に装備された前輪１３と、前輪１３の後方に装備されたエンジンユニット１４と、エンジンユニット１４の下方に配設される排気装置１７と、車体フレーム１１に連結するアーム部材１８と、該アーム部材１８に付設されるギアハウジング３０と、アーム部材１８及びギアハウジング３０に取り付けられる後輪２０とを備える。
図１のII−II線断面図である図２に示すように、アーム部材１８は、後輪２０を挟むように左右両側面に配設されており（以下、「左アーム部材１８Ａ」及び「右アーム部材１８Ｂ」という。）、それらのうち左アーム部材１８Ａには、後述するギアハウジング３０を含むシャフトドライブ機構が設けられている。
なお、本実施形態に係る自動二輪車１０には、一般的な自動二輪車と同様、燃料タンク、シート、ヘッドライトその他のランプ類、各種計器類、風防等が付設されるが、これらは本発明の説明に全く必要がないため、図示は省略する。 FIG. 1 is a side view of a motorcycle 10 having a shaft drive mechanism. As shown in this figure, the motorcycle 10 according to the present embodiment is roughly divided into a front fork 12 pivotally supported by a vehicle body frame 11, a front wheel 13 mounted at the lower end of the front fork 12, and a front wheel. 13, an engine unit 14 mounted behind the engine unit 13, an exhaust device 17 disposed below the engine unit 14, an arm member 18 connected to the vehicle body frame 11, and a gear housing 30 attached to the arm member 18 And the rear wheel 20 attached to the arm member 18 and the gear housing 30.
As shown in FIG. 2 which is a cross-sectional view taken along the line II-II in FIG. 1, the arm member 18 is disposed on both left and right sides so as to sandwich the rear wheel 20 (hereinafter referred to as “left arm member 18A” and “ The right arm member 18B ”), among them, the left arm member 18A is provided with a shaft drive mechanism including a gear housing 30 described later.
The motorcycle 10 according to the present embodiment is provided with a fuel tank, a seat, a headlight and other lamps, various instruments, a windshield, and the like, as in a general motorcycle. Since it is not necessary for the description at all, the illustration is omitted.

図示されるように、本実施形態に係るエンジンユニット１４は、いわゆるＶ型多気筒エンジン１４Ａを搭載して成るユニットである。このユニット１４の下部には、従来の自動二輪車と同様、クランクケース１５及びミッションケース１６が設けられている。Ｖ型エンジン１４Ａ（動力源）で生じた動力は、クランクケース１５内のクランク軸（図示せず）に伝達される。ミッションケース１６内には、図示しない変速装置を構成する変速ギア群が装備されており、クランク軸からエンジン動力が伝達される。かかる変速装置から更に動力が図示しない出力軸に伝達され、ユニバーサルジョイント部を介して本実施形態に係るシャフトドライブ機構のドライブシャフト４２に伝達される。
図２に示すように、かかるドライブシャフト４２は、左アーム部材１８Ａの内部に収容される。ドライブシャフト４２の先端にはユニバーサルジョイント部４２Ａが設けられており、その先端には当該ユニバーサルジョイント部４２Ａを介してベベルギアである駆動ギア４４が連結される。図１及び図２に示すように、左アーム部材１８Ａの後端には、本実施形態に係るギアハウジング３０が付設される。ギアハウジング３０の詳細な構成については後述する。
As shown in the figure, the engine unit 14 according to the present embodiment is a unit on which a so-called V-type multi-cylinder engine 14A is mounted. A crankcase 15 and a transmission case 16 are provided at the lower part of the unit 14 as in the conventional motorcycle. The power generated by the V-type engine 14A (power source) is transmitted to a crankshaft (not shown) in the crankcase 15. The transmission case 16 is equipped with a transmission gear group constituting a transmission (not shown) and transmits engine power from the crankshaft. Power is further transmitted from the transmission to an output shaft (not shown), and is transmitted to the drive shaft 42 of the shaft drive mechanism according to the present embodiment via the universal joint portion.
As shown in FIG. 2, the drive shaft 42 is accommodated in the left arm member 18A. The distal end of the drive shaft 42 is provided with a universal joint portion 42 A, the driving gear 44 is a bevel gear via the universal joint portion 42 A is connected at its distal end. As shown in FIGS. 1 and 2, a gear housing 30 according to this embodiment is attached to the rear end of the left arm member 18A. A detailed configuration of the gear housing 30 will be described later.

一方、左右両アーム部材１８Ａ，１８Ｂの間には車軸２２が支持される。この車軸２２には、回転可能に後輪２０が取り付けられる。後輪２０は、車軸２２を通す貫通孔２５Ａを構成するハブ２５及びその周囲に円盤状に拡がるスポーク（キャスト）２３と、その外周縁部であるリム２７と、当該リム２７に取り付けられたタイヤ２１と、ブレーキ用ディスク２９とを備える。
このハブ２５とスポーク２３により構成される貫通孔２５Ａの内壁には２つの軸受（ボールベアリング２６，ニードルベアリング２４）が装着されており、当該貫通孔２５Ａにはパイプ状の車軸２２が挿入される。すなわち、後輪２０は回転可能に車軸２２に取り付けられる。また、車軸２２にはディスクブレーキユニット６０が付設される。
また、図２及び図３に示すように、スポーク２３に隣接して環状のベベルギアである伝達ギア３５がハブ２５の一部（ボス部材２５Ｂ）にスプライン嵌合されることによってハブ２５周縁に配置される。これにより、伝達ギア３５は車軸２２を中心軸（但し本実施形態では車軸２２は回転しない）として後輪２０と一体に回転し得、駆動ギア４４からの動力を後輪２０にダイレクトに伝達することができる。
図示されるように、この伝達ギア３５には、歯当たり面３５Ａが形成されている本体部分から軸方向に延伸するボス部３５Ｂを備える。ボス部３５Ｂの先端は、後述するギアハウジング３０の外方軸受（上記第１の軸受に相当するボールベアリング）３７に回転可能に支持される。 On the other hand, the axle 22 is supported between the left and right arm members 18A and 18B. The rear wheel 20 is rotatably attached to the axle 22. The rear wheel 20 includes a hub 25 that constitutes a through hole 25 </ b> A through which an axle 22 passes, a spoke (cast) 23 that extends in a disk shape around the hub 25, a rim 27 that is an outer peripheral edge thereof, and a tire attached to the rim 27. 21 and a brake disk 29.
Two bearings (a ball bearing 26 and a needle bearing 24) are mounted on the inner wall of the through hole 25A constituted by the hub 25 and the spoke 23, and a pipe-shaped axle 22 is inserted into the through hole 25A. . That is, the rear wheel 20 is rotatably attached to the axle 22. A disc brake unit 60 is attached to the axle 22.
As shown in FIGS. 2 and 3, the transmission gear 35 that is an annular bevel gear adjacent to the spoke 23 is spline fitted to a part of the hub 25 (the boss member 25 </ b> B), so that it is arranged around the hub 25. Is done. Thereby, the transmission gear 35 can rotate integrally with the rear wheel 20 with the axle 22 as the central axis (however, the axle 22 does not rotate in this embodiment), and the power from the drive gear 44 is directly transmitted to the rear wheel 20. be able to.
As shown in the figure, the transmission gear 35 includes a boss portion 35B extending in the axial direction from the main body portion where the tooth contact surface 35A is formed. The tip of the boss portion 35B is rotatably supported by an outer bearing 37 (ball bearing corresponding to the first bearing) 37 described later.

図２から図４に示すように、ギアハウジング３０は、車体左側面に露出して視認されるハウジング本体部材（ギアハウジング構成部材）３３と、当該本体部材３３の車体側面側中央に形成された凹みに装着されるキャップ部材に相当する軸受押圧部材（ギアハウジング構成部材）３２と、後輪に面する側（以下「裏面側」ともいう。）に配置される裏面側カバー部材に相当する軸受支持部材（ギアハウジング構成部材）３４とを備える。
ハウジング本体部材３３は中央に車軸２２及びハブ２５の一部を通し得る開口部が形成された環状部材であり、４本のボルト４９によって左アーム部材１８Ａの後端に取り付けられる（図４参照）。また、図４に示すように、軸受支持部材（裏面側カバー部材）３４はハウジング本体部材３３に車体側面外方６本、裏面側２本、計８本のボルト３９によって固定される、また、軸受押圧部材（キャップ部材）３２はハウジング本体部材３３に計６本のボルト４８によって固定される。これらギアハウジング構成部材相互のボルト締着によってギアハウジング３０が構成される。 As shown in FIGS. 2 to 4, the gear housing 30 is formed at a housing body member (gear housing constituent member) 33 exposed on the left side surface of the vehicle body and visually recognized, and at the vehicle body side surface center of the body member 33. A bearing pressing member (gear housing component) 32 corresponding to a cap member mounted in the recess, and a bearing corresponding to a back side cover member disposed on the side facing the rear wheel (hereinafter also referred to as “back side”). And a support member (gear housing component) 34.
The housing body member 33 is an annular member formed with an opening through which a part of the axle 22 and the hub 25 can be passed in the center, and is attached to the rear end of the left arm member 18A by four bolts 49 (see FIG. 4). . Further, as shown in FIG. 4, the bearing support member (back side cover member) 34 is fixed to the housing body member 33 by six bolts 39 in total, six on the side of the vehicle body and two on the back side. The bearing pressing member (cap member) 32 is fixed to the housing body member 33 by a total of six bolts 48. The gear housing 30 is configured by bolting the gear housing components together.

次に、後輪２０及び車軸２２の車体（アーム部材１８）への取り付けと本実施形態に係るギアハウジング３０の構成ならびに組立て及び所定位置へのセットの手順について併せて説明する。
図２及び図３に示すように、上記駆動ギア（ベベルギア）４４の歯当たり面４４Ａと伝達ギア３５の歯当たり面３５Ａとが図３の符号Ｘで示されるようにうまく噛み合う（噛合する）ようにしてこれらをハウジング本体部材３３及び軸受支持部材３４に組み付ける。
具体的には、図３に示すように、内側に軸受（上記第２の軸受に相当するボールベアリング）３６が付設された軸受支持部材（裏面側カバー部材）３４を車体内方（後輪側）から伝達ギア３５と組み付ける。ここで、本実施形態に係る軸受支持部材（裏面側カバー部材）３４には、歯当たり面３５Ａの背面に近接する位置に軸受３６が配置されており、伝達ギア３５は、その歯当たり面３５Ａの背面側で回転可能にギアハウジング３０に支持される。このような位置に軸受（ボールベアリング）３６を設けることによって、伝達ギア３５に発生するスラスト力（軸方向力）を当該軸受（ボールベアリング）３６で受けることができる。これにより、伝達ギア３５の回転軸方向への振れやずれを抑え、信頼性の高いシャフトドライブ機構を実現することができる。 Next, the attachment of the rear wheel 20 and the axle 22 to the vehicle body (arm member 18), the configuration of the gear housing 30 according to the present embodiment, and the procedure of assembling and setting to a predetermined position will be described.
As shown in FIGS. 2 and 3, the tooth contact surface 44A of the drive gear (bevel gear) 44 and the tooth contact surface 35A of the transmission gear 35 are engaged with each other as shown by the symbol X in FIG. These are assembled to the housing body member 33 and the bearing support member 34.
Specifically, as shown in FIG. 3, a bearing support member (back side cover member) 34 having a bearing 36 (ball bearing corresponding to the second bearing) provided on the inner side is arranged on the vehicle body inner side (rear wheel side). To the transmission gear 35. Here, the bearing support member (back surface side cover member) 34 according to the present embodiment is provided with a bearing 36 at a position close to the back surface of the tooth contact surface 35A, and the transmission gear 35 has the tooth contact surface 35A. Is supported by the gear housing 30 so as to be rotatable on the back side. By providing the bearing (ball bearing) 36 at such a position, the thrust force (axial force) generated in the transmission gear 35 can be received by the bearing (ball bearing) 36. As a result, the transmission gear 35 can be prevented from swinging and shifting in the direction of the rotation axis, and a highly reliable shaft drive mechanism can be realized.

一方、車体側面の外方からハウジング本体部材３３を駆動ギア４４及び伝達ギア３５に組み付ける。ここでハウジング本体部材３３の内側には、駆動ギア４４を回転可能に支持するための２つの軸受（即ちボールベアリング４６と上記第３の軸受に相当するニードルベアリング４７）が付設されており、図示されるように、それら軸受４６，４７を介して駆動ギア４４は歯当たり面４４Ａの先端を越える位置（第３の軸受：ニードルベアリング４７）とギア基幹部位置（ボールベアリング４６）の両方で、回転可能にギアハウジング３０に支持される。
さらにハウジング本体部材３３の表面側（開口部の内側）には、駆動ギア４４に近接した位置であって駆動ギア４４よりも車体側面外方に外方軸受（ボールベアリング３７）が付設されており、図示されるように、伝達ギア３５はボス部３５Ｂ先端付近で当該軸受３７を介して回転可能に支持される。また、本実施形態では、図示されるように、外方軸受（第１の軸受）３７は該第３の軸受４７に対し車両前後方向に重複する（オーバーラップする）ように配置されている。
このような位置に軸受（外方軸受）３７を設けることによって、図示されるように、駆動ギア４４の先端と当該軸受３７との接触を防止しつつ、車両前後方向の当該軸受３７と駆動ギア４４との距離を縮められる。これにより、軸受（ボールベアリングが好ましい。）それ自体の機能を損なうことなく、アーム部材１８Ａに付設されるギアハウジング３０のサイズを小さくし、軽量化を図ることができる。また、マス集中及び前輪荷重の増大に寄与することができる。 On the other hand, the housing body member 33 is assembled to the drive gear 44 and the transmission gear 35 from the outside of the side surface of the vehicle body. Here, two bearings (that is, a ball bearing 46 and a needle bearing 47 corresponding to the third bearing) for rotatably supporting the drive gear 44 are attached to the inside of the housing main body member 33. As shown, the drive gear 44 through the bearings 46 and 47 is in both the position beyond the tip of the tooth contact surface 44A (third bearing: needle bearing 47) and the gear core position (ball bearing 46). The gear housing 30 is rotatably supported.
Further, an outer bearing (ball bearing 37) is attached to the front surface side (inside the opening) of the housing body member 33 at a position close to the drive gear 44 and outside the side of the vehicle body from the drive gear 44. As shown in the drawing, the transmission gear 35 is rotatably supported via the bearing 37 in the vicinity of the tip of the boss portion 35B. In the present embodiment, as shown in the figure, the outer bearing (first bearing) 37 is arranged so as to overlap (overlap) the third bearing 47 in the vehicle front-rear direction.
By providing the bearing (outer bearing) 37 at such a position, as shown in the figure, the bearing 37 and the drive gear in the vehicle front-rear direction are prevented while preventing contact between the tip of the drive gear 44 and the bearing 37. The distance to 44 can be shortened. Thereby, the size of the gear housing 30 attached to the arm member 18A can be reduced and the weight can be reduced without impairing the function of the bearing (ball bearing is preferable) itself. Moreover, it can contribute to mass concentration and an increase in front wheel load.

而して、上述のように、各ギアハウジング構成部材３３，３４と伝達ギア３５及び駆動ギア４４とを組み付け、ハウジング本体部材３３をアーム部材１８にボルト４９で固定し、さらにボルト３９によってハウジング構成部材３３，３４を相互に固定することによってギアハウジング３０が組立てられる。
そして、この組み付けた状態のハウジング本体部材３３及び軸受支持部材３４（即ちギアハウジング構成部材３３，３４）に車軸２２を中心に伝達ギア３５が回転可能なように後輪２０を取り付ける。これにより、ギアハウジング３０を介してドライブシャフト４２（駆動ギア４４を含む）と後輪２０とが連結される。 Thus, as described above, the gear housing constituting members 33, 34, the transmission gear 35 and the drive gear 44 are assembled, the housing main body member 33 is fixed to the arm member 18 with the bolt 49, and the housing 39 is constituted by the bolt 39. The gear housing 30 is assembled by fixing the members 33 and 34 to each other.
Then, the rear wheel 20 is attached to the housing body member 33 and the bearing support member 34 (that is, the gear housing constituent members 33 and 34) in the assembled state so that the transmission gear 35 can rotate around the axle 22. Thus, the drive shaft 42 (including the drive gear 44) and the rear wheel 20 are connected via the gear housing 30.

次いで、車軸２２を貫通孔２５Ａに通す。車軸２２の両端は、右アーム部材１８Ｂの取付孔１８Ｃとギアハウジング３０に形成される取付孔３１にそれぞれ固定される。その取付孔３１に固定される側の車軸２２の先端部側面には雄ねじ２２Ａが形成されている。
そして、ハウジング本体部材３３の中央開口部を車体側面外方から塞ぐように軸受押圧部材（一つのハウジング構成部材であるキャップ部材）３２を装着し、計６本のボルト４８によって固定する。このとき、本実施形態に係る軸受押圧部材３２の中央に形成されている車軸取付孔３１の内壁には雌ねじ３１Ａが形成されており、相対する車軸２２の雄ねじ２２Ａと螺合させることができる。これにより、車軸２２を固定する器具を別途に使用することなく、車軸２２を所定位置に容易に固定することができる。また、図示されるように、軸受押圧部材３２によって、外方軸受３７を軸方向に押圧し、ハウジング本体部材３３と当該軸受押圧部材３２との間の所定位置で外方軸受３７を確実に固定することができる。 Next, the axle 22 is passed through the through hole 25A. Both ends of the axle 22 are fixed to an attachment hole 18C of the right arm member 18B and an attachment hole 31 formed in the gear housing 30, respectively. A male screw 22 </ b> A is formed on the side surface of the tip end portion of the axle 22 fixed to the mounting hole 31.
Then, a bearing pressing member (a cap member which is one housing constituent member) 32 is mounted so as to close the central opening of the housing body member 33 from the side of the vehicle body, and is fixed by a total of six bolts 48. At this time, an internal thread 31A is formed on the inner wall of the axle mounting hole 31 formed at the center of the bearing pressing member 32 according to the present embodiment, and can be screwed into the external thread 22A of the opposite axle 22. Accordingly, the axle 22 can be easily fixed at a predetermined position without using a separate tool for fixing the axle 22. Further, as shown in the figure, the outer bearing 37 is pressed in the axial direction by the bearing pressing member 32, and the outer bearing 37 is securely fixed at a predetermined position between the housing main body member 33 and the bearing pressing member 32. can do.

図１及び図４に示すように、ハウジング本体部材３３の上部（車体装着時）には、ブリーザ機能付きギアオイル注入ポート部５０が形成されている。図４に示すように、このポート部５０は、ギアハウジング内にギアオイルを供給する供給路５８と、該供給路５８の開口部に開閉可能に取り付けられる開閉ボルト５６と、そのボルト５６の開口部に圧入された通気構造のブリーザ本体５４とその上に通気を妨げない状態で被せられるブリーザキャップ５２とから構成されている。かかる構成のブリーザ機能付きギアオイル注入ポート部５０を設けたことにより、従来のようにギアオイル注入部とブリーザ部とを別々に設けなくてよい。このため、ギアハウジング３０の構造がよりシンプルになり、加工費の削減に資する。また、ギアハウジング組立てに要する部品数を削減し、ギアハウジング組立てやメンテナンスに要する時間の短縮と労力低減を図ることができる。
また、図４に示すように、ハウジング本体部材３３の下部（車体装着時）には、ハウジング３０内からギアオイル等を排出するための図示しないドレン機構が設けられており、排出口の開閉を行うドレンボルト５９が装着されている。 As shown in FIGS. 1 and 4, a gear oil injection port portion 50 with a breather function is formed on the upper portion of the housing body member 33 (when mounted on the vehicle body). As shown in FIG. 4, the port 50 includes a supply channel 5 8 supplies gear oil into the gear housing, a closing bolt 56 that openably mounted to an opening of the supply path 5 8, the bolt 56 The breather body 54 has a ventilation structure press-fitted into the opening, and a breather cap 52 is placed on the breather body 54 so as not to block the ventilation. By providing the gear oil injection port portion 50 with the breather function having such a configuration, it is not necessary to separately provide the gear oil injection portion and the breather portion as in the prior art. For this reason, the structure of the gear housing 30 becomes simpler, which contributes to a reduction in processing costs. Further, the number of parts required for assembling the gear housing can be reduced, and the time required for assembling and maintaining the gear housing and the labor can be reduced.
As shown in FIG. 4, a drain mechanism (not shown) for discharging gear oil and the like from the housing 30 is provided at the lower portion of the housing body member 33 (when the vehicle body is mounted), and opens and closes the discharge port. A drain bolt 59 is attached.

以上、本発明の好適な一実施形態を図面を参照しつつ説明したが、本発明の範囲をかかる図面に記載した形態に限定するものではなく、本発明の目的・構成・効果を逸脱しない限りにおいて種々の変更例が包含され得る。
例えば、上記実施形態では、アーム部材内にドライブシャフトが配備されているがこの形態に限定されない。例えば、アーム部材とドライブシャフトとが別個独立に配置されてもよい。
また、上記実施形態では、ギアハウジングとアーム部材とが一体であるがこの形態に限定されない。例えば、アーム部材とギアハウジングとが別個独立に形成されてもよい。
また、ギアハウジングを構成する各部材の形状や数は、適用する自動二輪車のタイプや形態に応じて異なり得るため、特に限定されない。
また、上記実施形態の外方軸受では、特に好適な形態としてボールベアリングを採用しているがこの形態に限定されず、他の形態・種類の軸受でもよい。 The preferred embodiment of the present invention has been described above with reference to the drawings. However, the scope of the present invention is not limited to the embodiments described in the drawings, and the object, configuration, and effects of the present invention are not deviated. Various modifications may be included in.
For example, in the said embodiment, although the drive shaft is arrange | positioned in the arm member, it is not limited to this form. For example, the arm member and the drive shaft may be arranged separately and independently.
Moreover, in the said embodiment, although a gear housing and an arm member are integral, it is not limited to this form. For example, the arm member and the gear housing may be formed separately and independently.
Further, the shape and the number of the members constituting the gear housing are not particularly limited because they can vary depending on the type and form of the motorcycle to be applied.
In the outer bearing of the above embodiment, a ball bearing is adopted as a particularly suitable form, but the invention is not limited to this form, and other forms and types of bearings may be used.

本発明は、シャフトドライブ機構に含まれるギアハウジングの小サイズ化、軽量化に資する発明であるから、シャフトドライブ機構を備えた自動二輪車に広く適用することができる。 The present invention is an invention that contributes to the reduction in size and weight of the gear housing included in the shaft drive mechanism, and therefore can be widely applied to motorcycles equipped with the shaft drive mechanism.

一実施形態に係る自動二輪車を示す側面図である。1 is a side view showing a motorcycle according to an embodiment. 図１におけるII−II線に沿う断面図である。It is sectional drawing which follows the II-II line | wire in FIG. 一実施形態に係るギアハウジングの構成を示す図２の要部拡大図である。It is a principal part enlarged view of FIG. 2 which shows the structure of the gear housing which concerns on one Embodiment. 一実施形態に係るギアハウジングの表面の形態を示す正面図である。It is a front view which shows the form of the surface of the gear housing which concerns on one Embodiment. ギアハウジングに装備されるブリーザ機能付きギアオイル注入ポート部の構成を模式的に示す断面図である。It is sectional drawing which shows typically the structure of the gear oil injection | pouring port part with a breather function with which a gear housing is equipped.

Explanation of symbols

１０自動二輪車
１１車体フレーム
１４エンジンユニット
１５クランクケース
１６ミッションケース
１８アーム部材（１８Ａ左アーム部材、１８Ｂ右アーム部材）
２０後輪
２２車軸
２２Ａ雄ねじ
２５ハブ
３０ギアハウジング
３１車軸取付孔
３２軸受押圧部材（キャップ部材）
３２Ａ雌ねじ
３３ハウジング本体部材
３４軸受支持部材（裏面側カバー部材）
３５伝達ギア
３５Ａ歯当たり面
３５Ｂボス部
３６，３７，４６，４７軸受
４２ドライブシャフト
４４駆動ギア
４４Ａ歯当たり面
５０ブリーザ機能付きギアオイル注入ポート部
DESCRIPTION OF SYMBOLS 10 Motorcycle 11 Body frame 14 Engine unit 15 Crankcase 16 Mission case 18 Arm member (18A left arm member, 18B right arm member)
20 Rear wheel 22 Axle 22A Male thread 25 Hub 30 Gear housing 31 Axle mounting hole 32 Bearing pressing member (cap member)
32A Female Thread 33 Housing Body Member 34 Bearing Support Member (Back Side Cover Member)
35 Transmission gear 35A Tooth contact surface 35B Boss portion 36, 37, 46, 47 Bearing 42 Drive shaft
44 Drive gear 44A Tooth contact surface 50 Gear oil injection port with breather function

Claims

Body frame,
An arm member coupled to the vehicle body frame;
A drive shaft for transmitting power from a power source;
A drive gear coupled to the drive shaft;
A transmission gear that meshes with the drive gear and transmits power to the rear wheels;
A gear housing disposed inside the drive gear and the transmission gear in a state of meshing with each other;
An axle supported by the arm member and / or the gear housing;
A rear wheel rotatably attached to the axle;
A motorcycle equipped with
The transmission gear is attached to a rear wheel so as to be rotatable around the axle that does not rotate,
The gear housing includes a first bearing that rotatably supports the transmission gear;
The first bearing is located close to the drive gear, and is disposed on the outer side of the vehicle body side than the side end of the drive gear ;
The drive gear is supported by the gear housing via a third bearing at a position beyond the tip of the tooth contact surface,
The first bearing is arranged so as to overlap the third bearing in the vehicle front-rear direction,
A second bearing that rotatably supports the transmission gear is disposed at a position close to the back surface of the tooth contact surface that meshes with and rotates with the drive gear;
The gear housing includes a bearing pressing member that presses the first bearing from the outside of the side of the vehicle body toward the vehicle width center side along the axle.
A male screw is formed at one end of the axle,
The motorcycle, wherein the bearing pressing member is formed with a female screw into which a male screw of the axle is screwed .

Wherein the first bearing is a ball bearing, a motorcycle according to claim 1.

The motorcycle according to claim 1 or 2 , wherein the second bearing is a ball bearing.

The motorcycle according to any one of claims 1 to 3, wherein the third bearing is a needle bearing.

The motorcycle according to any one of claims 1 to 4, wherein a gear oil injection port with a breather function is formed in the gear housing.

A gear housing setting method in which a drive gear connected to a drive shaft and a transmission gear for transmitting power transmitted from the drive gear to a rear wheel are meshed with each other,
A first step of assembling the gear housing by assembling the drive gear and the transmission gear into a gear housing component in a state where the drive gear and the transmission gear are engaged with each other;
A second step of attaching a rear wheel to the gear housing component so that the transmission gear can rotate around a non-rotating axle;
A third step of attaching the axle to an assembly in which a rear wheel is attached to the gear housing component so that the transmission gear can rotate about the axle;
The first step includes
The transmission gear is rotatably supported by a first bearing, and the first bearing is located close to the drive gear and is located on the outer side of the vehicle body side than the side end of the drive gear. as arranged, it viewed including the assembly of the gear housing component including first bearing from the vehicle body laterally,
The first step includes
The drive gear is supported by a gear housing via a third bearing at a position beyond the tip of the tooth contact surface, and the first bearing is disposed so as to overlap the third bearing in the vehicle front-rear direction. Including
The first step includes
Disposing a second bearing that rotatably supports the transmission gear at a position close to the back surface of the tooth contact surface that meshes with and rotates with the drive gear;
Including assembling a bearing pressing member to the gear housing from the outside of the vehicle body side surface, and pressing the first bearing along the axle toward the vehicle width center side;
A male screw is formed on one end of the axle, and a female screw is formed on the bearing pressing member.
A gear housing setting method comprising screwing a male screw of the axle mounted on a rear wheel with the pressing into the female screw .

The gear housing setting method according to claim 6, wherein the first bearing is a ball bearing.

The gear housing setting method according to claim 6 or 7, wherein the second bearing is a ball bearing.

The gear housing setting method according to any one of claims 6 to 8, wherein the third bearing is a needle bearing.

The gear housing setting method according to any one of claims 6 to 9, wherein a gear oil injection port with a breather function is formed in the gear housing.