JPS63198758A - Engine case of two cycle engine - Google Patents

Engine case of two cycle engine

Info

Publication number
JPS63198758A
JPS63198758A JP2934287A JP2934287A JPS63198758A JP S63198758 A JPS63198758 A JP S63198758A JP 2934287 A JP2934287 A JP 2934287A JP 2934287 A JP2934287 A JP 2934287A JP S63198758 A JPS63198758 A JP S63198758A
Authority
JP
Japan
Prior art keywords
case
engine
bolt
scavenging
scavenging passage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2934287A
Other languages
Japanese (ja)
Inventor
Mutsuhiro Taneyama
種山 六広
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP2934287A priority Critical patent/JPS63198758A/en
Publication of JPS63198758A publication Critical patent/JPS63198758A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/16Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18Multi-cylinder engines
    • F02B75/22Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/02Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00Other engines
    • F02B75/16Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18Multi-cylinder engines
    • F02B2075/1804Number of cylinders
    • F02B2075/1808Number of cylinders two
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02FCYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F2200/00Manufacturing
    • F02F2200/06Casting

Abstract

PURPOSE:To improve the appearance of the engine case in the caption by inserting a bolt from the internal wall of the scavenging passage of one case for constituting a scavenging path into the other case side, and joining both cases tightly, in case of the engine case built up with an upper-case and a lower-case bolted together. CONSTITUTION:In a V-type two cycle engine E, an engine case 24 is composed of an upper-case 25 and a lower-case 26, and a crankcase 30 and a transmission chamber 31 are formed between both cases 25, 26. Two cylinderblock 33a, 33b are formed on the frontside of a crankcase 30 in the engine case 24 at both upper and lower positions, and an exhaust passage and a scavenging passage are formed in respective cylinder blocks 33a, 33b. And the upper-case 25 and the lower-cast 26 are bound together by means of bolts 70, 71, but the bolt 71 of them is provided so as to be screwed in a bolt hole 26a2 which is formed toward the upper-case 25 from the inner wall of the scavenging path 38a in the lower-case 26, and in the bolt hole 25a2 formed in the upper-case 25.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は2サイクルエンジンのエンジンケースに関する
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine case for a two-stroke engine.

(従来の技術) 2サイクルエンジンのエンジンケースのなかには、該ケ
ースをアッパーケース、ロアケースとから構成し、これ
ら両ケースをボルトにて止着して構成したものがある。
(Prior Art) Some engine cases for two-stroke engines include an upper case and a lower case, both of which are fixed together with bolts.

(発明が解決しようとする問題点) 斯かる構成のエンジンケースに於いては、アッパーケー
ス、ロアケースをボルトで止着する際に、一方のケース
の外側から他方のケース側へボルトを挿通して両者を締
着しており、このため、エンジンケースは常にこのボル
トの挿通箇所を考慮した構造にしなければならず、エン
ジンの形状、構造に一定の制限が加わり、その設計自由
度が低くなるという不具合があった。
(Problem to be Solved by the Invention) In an engine case having such a configuration, when securing the upper case and lower case with bolts, it is necessary to insert the bolts from the outside of one case to the side of the other case. Both bolts are fastened together, and for this reason, the engine case must always be structured to take into account the insertion points of these bolts, which places certain restrictions on the shape and structure of the engine and reduces the degree of freedom in its design. There was a problem.

一方、前述の構造によれば、ボルト頭部が常にエンジン
外側面に露出するため、エンジンの外観が悪化するとい
う不具合があった。
On the other hand, according to the above-mentioned structure, the bolt heads are always exposed on the outer surface of the engine, resulting in a problem that the appearance of the engine deteriorates.

本発明は斯かる事情に鑑み成されたものであり、その目
的とする処は設計自由度が高く且つ外観性も良い2サイ
クルエンジンのエンジンケースを提供するにある。
The present invention has been made in view of the above circumstances, and its purpose is to provide an engine case for a two-stroke engine that has a high degree of freedom in design and has a good appearance.

(問題点を解決するための手段) 前記目的を達成するため本発明はアッパーケース(25
)とロアケース(26)とをボルト(71)にて止着す
ることにより構成されたエンジンケース(24)であて
、該エンジンケース(24)には掃気通路(38a)が
形成された2サイクルエンジンのエンジンケース(24
)に於いて、前記掃気通路(38a)を画成する一方の
ケースの掃気通路内壁部から他方のケース側へ前記ボル
ト(71)を挿通して両者を止着したことを特徴とする
(Means for Solving the Problems) In order to achieve the above object, the present invention provides an upper case (25
) and a lower case (26) are fastened together with bolts (71) to form an engine case (24), and the engine case (24) has a scavenging passage (38a). engine case (24
) is characterized in that the bolt (71) is inserted from the inner wall of the scavenging passage of one case defining the scavenging passage (38a) to the other case side to fasten the two.

(作用) エンジンケースを構成するアッパーケース、ロアケース
のうち一方のケースの掃気通路内壁部から他方のケース
側へボルトを挿通してアッパーケースとロアケースを止
着するので、エンジンケースに特にボルト挿通用の箇所
を形成する必要がなくなり、エンジンの設計自由度を向
上させることができる。又ボルト頭部が掃気通路内に隠
れるためエンジン外側面に露出することがなくなり、エ
ンジンの外観性の向上を図ることができる。
(Function) Bolts are inserted from the inner wall of the scavenging passage of one of the upper and lower cases that make up the engine case to the other case to fasten the upper and lower cases, so it is especially suitable for bolt insertion into the engine case. It is no longer necessary to form such a part, and the degree of freedom in designing the engine can be improved. Furthermore, since the bolt head is hidden within the scavenging passage, it is no longer exposed to the outer surface of the engine, and the appearance of the engine can be improved.

(実施例) 以下に本説明の好適一実施例を添付図面に基づいて説明
する。
(Embodiment) A preferred embodiment of the present description will be described below based on the accompanying drawings.

第1図は自動二輪車の側面図、第2図はエンジンの横断
面図、第3図は縦断面図である。
FIG. 1 is a side view of the motorcycle, FIG. 2 is a cross-sectional view of the engine, and FIG. 3 is a vertical cross-sectional view.

図面中、(1)は自動二輪車、(3)は前輪、(5)は
後輪、(7)は車体フレームで、左右のフロントフォー
ク(11) 、 (11)上には前輪(3)を操舵する
ハンドル(15)を設け、車体フレーム(7)後部には
後輪(5)を懸架するリヤフォーク(lO)を上下に揺
動自在に結合する。
In the drawing, (1) is the motorcycle, (3) is the front wheel, (5) is the rear wheel, (7) is the body frame, and the left and right front forks (11), the front wheel (3) is on top of (11). A steering wheel (15) is provided, and a rear fork (10) for suspending a rear wheel (5) is coupled to the rear of the body frame (7) so as to be able to swing up and down.

前記車体フレーム(7)は、ヘッドチューブ(16)か
ら後方へ延出した上下二本より成るメインバイブ(18
)と、該メインバイブ(18)より垂下した左右のダウ
ンチューブ(20)と、ダウンチューブ(20)の下端
より後方へ略水平に延出するダウンチューブロア(21
)、及びダウンチューブロア(21)後端とメインバイ
ブ(18)とを連結するセンターチューブ(22)等か
ら構成される。
The body frame (7) has a main vibe (18) consisting of two upper and lower parts extending rearward from the head tube (16).
), left and right down tubes (20) that hang down from the main vibe (18), and a down tube lower (21) that extends rearward and approximately horizontally from the lower end of the down tube (20).
), and a center tube (22) that connects the rear end of the down tube lower (21) and the main vibe (18).

前記ダウンチューブロア(21)上にはエンジン(E)
を載置する。
An engine (E) is mounted on the down tube lower (21).
Place.

該エンジン(E)はシリンダブロックが側面視でV字状
を成すV型2気筒2サイクルエンジンで該エンジン(E
)のエンジンケース(24)はアッパーケース(25)
とロアケース(26)とから構成される。
The engine (E) is a V-type two-cylinder two-stroke engine whose cylinder block is V-shaped in side view.
) engine case (24) is the upper case (25)
and a lower case (26).

アッパーケース(25)とロアケース(26)間にはこ
れら(25) 、 (26)を接合した状態でクランク
室(3o)とミッション室(31)とが形成され、この
クランク室(30)とミッション室(31)とはアッパ
ーケース(25)とロアケース(26)に形成した隔壁
(25a) 、 (26a)により隔別されている。
A crank chamber (3o) and a transmission chamber (31) are formed between the upper case (25) and lower case (26) by joining these (25) and (26), and the crank chamber (30) and the transmission chamber (31) are formed between the upper case (25) and lower case (26). The chamber (31) is separated from the chamber (31) by partition walls (25a) and (26a) formed in the upper case (25) and lower case (26).

前記エンジンケース(24)は、クランク室(30)が
前輪(3)側に、ミッション室(31)が後輪(5)側
になるように前後輪(3) 、 (5)間で略水平に配
置される。(第2図中(1)は走行路面に平行な線を示
す) 又、エンジンケース(24)のクランク室(30)前部
側には側面視V型を成す2つのシリンダブロック(33
a) 、 (33b)を上下に形成し、これらシリンダ
ブロック(33a) 、 (33b)内には夫々ピスト
ン(35a)。
The engine case (24) is arranged approximately horizontally between the front and rear wheels (3) and (5) so that the crank chamber (30) is on the front wheel (3) side and the transmission chamber (31) is on the rear wheel (5) side. will be placed in ((1) in Fig. 2 indicates a line parallel to the running road surface) In addition, on the front side of the crank chamber (30) of the engine case (24), there are two cylinder blocks (33) forming a V-shape in side view.
a) and (33b) are formed above and below, and a piston (35a) is provided in each of these cylinder blocks (33a) and (33b).

(35b)を摺動自在に嵌挿し、該ピストン(35a)
(35b) is slidably inserted into the piston (35a).
.

(35b)  と各シリンダブロック(33a) 、 
(33b) に固着したシリンダヘッド(34a) 、
 (34b)  との間には燃焼室(36a) 、 (
36b)を形成する。更にこれらシリンダブロック(3
3a) 、 (33b)には夫々排気通路(37a)。
(35b) and each cylinder block (33a),
(33b) Cylinder head (34a) fixed to
(34b) There is a combustion chamber (36a), (
36b). Furthermore, these cylinder blocks (3
3a) and (33b) each have an exhaust passage (37a).

(37b)及び掃気通路H8a) 、 (38b)を形
成する。シリンダブロック(33a) 、 (33b)
のうちシリンダブロック(33a)はロアケース(26
)側に、シリンダブロック(33b)はアッパーケース
(25)側に形成され、即ちエンジンケース(24)を
アッパーケス(25)ロアケース(26)に分割する割
り面(P)は上下のシリンダブロック(33b) 、 
(33a)の中間で地面と略平行に延出し、エンジンケ
ース(24)は高さの略中心部分で上下2つのケースに
分割されることになる。
(37b) and scavenging passages H8a) and (38b) are formed. Cylinder block (33a), (33b)
Of these, the cylinder block (33a) is attached to the lower case (26
) side, the cylinder block (33b) is formed on the upper case (25) side, that is, the dividing plane (P) that divides the engine case (24) into the upper case (25) and lower case (26) is formed on the upper and lower cylinder blocks (33b). ),
(33a) extends substantially parallel to the ground, and the engine case (24) is divided into two upper and lower cases approximately at the center of the height.

一方、前記クランク室(30)内にはクランク軸(40
)を、又前記ミッション室(31)内には歯車変速m構
(41)を夫々配設する。クランク軸(40)はそのジ
ャーナル部がボールベアリング(41)により回転自在
に支持され、又2つのクランクビン部が前述したピスト
ン(35a) 、 (35b) に夫々コネクティング
ロッド(45a) 、 (45b)を介して連結される
。又変速歯車機構(41)はボールベアリング(48)
 、 (49)を介して略平行に支持されたメインシャ
フト(50)とカウンタシャフト(51)から成り、こ
れらシャフト(50) 、 (51)にそれぞれスプラ
イン結合した歯車(55) 、 (5B)が噛合して変
速段に対応した歯車列を構成している。この歯車変速機
構(41)は周知のように、歯車(55) 、 (5B
)が図外の変速レバーの操作で各シャフト(50) 、
 (51)上を軸方向に摺動し、変速レバーの操作に応
じた歯車列を確立してエンジン動力を変速する。
On the other hand, the crankshaft (40) is located in the crank chamber (30).
), and a gear transmission mechanism (41) is provided in the mission chamber (31). The crankshaft (40) has its journal portion rotatably supported by a ball bearing (41), and the two crankshaft portions connect the connecting rods (45a) and (45b) to the pistons (35a) and (35b), respectively. connected via. Also, the speed change gear mechanism (41) uses ball bearings (48).
It consists of a main shaft (50) and a counter shaft (51) that are supported substantially parallel to each other via shafts (50) and (49), and gears (55) and (5B) are spline-coupled to these shafts (50) and (51), respectively. They mesh to form a gear train corresponding to the gear position. As is well known, this gear transmission mechanism (41) includes gears (55), (5B
) is connected to each shaft (50) by operating the gear shift lever (not shown).
(51) It slides on the top in the axial direction, establishes a gear train according to the operation of the speed change lever, and changes the speed of the engine power.

アッパーケース(25)には第4図に詳示するように2
つの吸気通路(58a) 、 (sab)を各気筒に対
応して略平行に形成し、該吸気通路(58a) 、 (
58b)はその一端側がクランク室(30)に開口する
とともに他端側が吸気管(Boa) 、 (60b)を
介して気化器(62)に連絡している。
The upper case (25) has two
Two intake passages (58a), (sab) are formed substantially parallel to each other, corresponding to each cylinder.
58b) opens into the crank chamber (30) at one end and communicates with the carburetor (62) via the intake pipe (Boa) and (60b) at the other end.

(63a) 、 (63b)は吸気通路(58a) 、
 (58b)内に設けたリードバルブ、(84a) 、
 (64b)はそのストッパーである。
(63a), (63b) are intake passages (58a),
Reed valve provided in (58b), (84a),
(64b) is the stopper.

前記アッパーケース(25)の吸気通路(Saa)。An intake passage (Saa) of the upper case (25).

(58b)間にはブリーザチャンバー(65)を形成し
、該チャンバー(65)はアッパーケース(25)、ロ
アケース(26)に形成したブリーザ通路(66)によ
りミッション室(31)に連通し、またその一方で、ド
レン管(67)により大気に開放されている。
A breather chamber (65) is formed between (58b), and the chamber (65) communicates with the mission chamber (31) through a breather passage (66) formed in the upper case (25) and lower case (26). On the other hand, it is opened to the atmosphere through a drain pipe (67).

尚、(75)はミッション室(31)上壁に形成したオ
イル通路である。
Note that (75) is an oil passage formed in the upper wall of the mission chamber (31).

ところで本実施例では第5図に示すようにアッパーケー
ス(25)とロアケース(26)とをボルト(70) 
、 (71)にて締着している。このうちボルト(70
)はロアケース(26)の隔壁(28a)に形成したボ
ルト孔(26al)およびアッパーケース(25)の隔
壁(25a)に形成したボルト孔(25al)に螺合し
、一方ボルト(71)はロアケース(26)の掃気通路
(38a)内壁部からアッパーケース(25)に向けて
形成したボルト孔(26a2)及びアッパーケース(2
5)に形成したボルト孔(25a2)に螺合し、以上に
よりアッパーケース(25)とロアケース(26)が締
着される。
By the way, in this embodiment, as shown in FIG. 5, the upper case (25) and lower case (26) are connected by bolts (70)
, (71) is tightened. Of these, Bolt (70
) are screwed into bolt holes (26al) formed in the partition wall (28a) of the lower case (26) and bolt holes (25al) formed in the partition wall (25a) of the upper case (25), while the bolts (71) are screwed into the bolt holes (25al) formed in the partition wall (28a) of the lower case (26). The bolt hole (26a2) formed from the inner wall of the scavenging passage (38a) of (26) toward the upper case (25) and the upper case (26)
5), and the upper case (25) and lower case (26) are thus fastened together.

このように本実施例ではボルト(71)の方に本発明を
適用している。
In this way, the present invention is applied to the bolt (71) in this embodiment.

以上に於いて、本実施例によれば、ロアケース(26)
の掃気通路(38b)内壁部からアッパーケース(25
)側へボルト(71)を挿通して、アッパーケース(2
5)、ロアケース(2B)を止着するので、従来のよう
にエンジンケースに特別にボルト挿通用の箇所を形成す
る必要がなくなり、エンジンの設計自由度を向上させる
ことができる。又ボルト(71)頭部が掃気通路内即ち
エンジン内に隠れるので、エンジンの外観性を向上させ
ることができる。
In the above, according to this embodiment, the lower case (26)
from the inner wall of the scavenging passage (38b) to the upper case (25
) side and insert the bolt (71) into the upper case (2
5) Since the lower case (2B) is fixedly attached, there is no need to form a special place for bolt insertion in the engine case as in the conventional case, and the degree of freedom in designing the engine can be improved. Further, since the head of the bolt (71) is hidden in the scavenging passage, that is, inside the engine, the appearance of the engine can be improved.

(発明の効果) 以上に述べたように本発明によれば、エンジンケースを
構成するアッパーケース、ロアケースのうち、一方のケ
ースの掃気通路内壁部から他方のケース側へボルトを押
通してアッパーケースとロアケースを止着するので、エ
ンジンの設計自由度の向上、並びに外観性の向上を図る
ことができる。
(Effects of the Invention) As described above, according to the present invention, a bolt is pushed through from the inner wall of the scavenging passage of one of the upper case and lower case constituting the engine case to the side of the other case. Since the lower case is fixed to the lower case, it is possible to improve the degree of freedom in designing the engine and improve the appearance.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は自動二輪車の側面図、第2図はエンジンの横断
面図、第3図は同縦断面図、第4図は第2図のIV −
IV線断面図、第5図はアッパーケースとロアケースと
の接合状態を示す要部拡大断面図である。 尚、図面中
、 (24)はエンジンケース、(25)はアッパーケ
ース、(26)はロアケース、(38a)は掃気通路、
(71)はボルトである。 特 許 出 願 人  本田技研工業株式会社代理人 
 弁理士   下  1)容−即問    弁理士  
  大  橋  邦  産量   弁理士   小  
山    有量   弁理士   野  1)   茂
第4図 5δa
Fig. 1 is a side view of the motorcycle, Fig. 2 is a cross-sectional view of the engine, Fig. 3 is a longitudinal sectional view of the same, and Fig. 4 is the IV of Fig. 2.
FIG. 5 is an enlarged sectional view of a main part showing a joined state of an upper case and a lower case. In the drawing, (24) is the engine case, (25) is the upper case, (26) is the lower case, (38a) is the scavenging passage,
(71) is a bolt. Patent applicant: Agent for Honda Motor Co., Ltd.
Patent Attorney Part 2 1) Yong-Immediate Question Patent Attorney
Kuni Ohashi Production volume Patent attorney Small
Yama Yuki Patent Attorney No 1) Shigeru 4th figure 5δa

Claims (1)

【特許請求の範囲】 アッパーケースとロアケースとをボルトにて止着するこ
とにより構成されたエンジンケースであて、 該エンジンケースには掃気通路が形成された2サイクル
エンジンのエンジンケースに於いて、前記掃気通路を画
成する一方のケースの掃気通路内壁部から他方のケース
側へ前記ボルトを挿通して両者を止着したことを特徴と
する2サイクルエンジンのエンジンケース。
[Scope of Claims] An engine case for a two-stroke engine configured by fixing an upper case and a lower case with bolts, the engine case having a scavenging passage formed therein. An engine case for a two-stroke engine, characterized in that the bolt is inserted from an inner wall of a scavenging passage of one case defining a scavenging passage to the other case side to fix the two.
JP2934287A 1987-02-10 1987-02-10 Engine case of two cycle engine Pending JPS63198758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2934287A JPS63198758A (en) 1987-02-10 1987-02-10 Engine case of two cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2934287A JPS63198758A (en) 1987-02-10 1987-02-10 Engine case of two cycle engine

Publications (1)

Publication Number Publication Date
JPS63198758A true JPS63198758A (en) 1988-08-17

Family

ID=12273558

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2934287A Pending JPS63198758A (en) 1987-02-10 1987-02-10 Engine case of two cycle engine

Country Status (1)

Country Link
JP (1) JPS63198758A (en)

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