JPS6343268Y2

JPS6343268Y2 -

Info

Publication number: JPS6343268Y2
Application number: JP18503283U
Authority: JP
Priority date: 1983-11-30
Filing date: 1983-11-30
Publication date: 1988-11-11
Also published as: JPS6091689U

Description

【考案の詳細な説明】本考案は回転する中空軸の先端に取付けられた
ドリルビツトにより地中を掘削し、土砂を中空軸
を通して排出しながら掘進む地中掘削機に用いら
れる減速装置に関するものである。[Detailed description of the invention] The present invention relates to a speed reduction device used in an underground excavator that excavates underground using a drill bit attached to the tip of a rotating hollow shaft, and excavates earth and sand through the hollow shaft. be.

従来のこの種の地中掘削機においては、モータ
の回転を減速して中空軸に伝える減速装置が中空
軸の外側に大きく張出したものであつたため、掘
削機全体を大型、大重量化させているという問題
点があつた。 In conventional underground excavators of this type, the deceleration device that decelerates the rotation of the motor and transmits it to the hollow shaft protrudes largely outside the hollow shaft, making the entire excavator large and heavy. There was a problem with that.

本考案は、従来の減速装置の上記のような問題
点に着目してなされたもので、傾斜面歯車を用
い、中空軸のまわりに、これと同心的に減速装置
を組立てる構成とすることにより、減速装置を小
型、軽量化して従来の問題点を解決することを目
的としている。 The present invention was developed by focusing on the above-mentioned problems of conventional reduction gears, and by using an inclined surface gear and assembling the reduction gear concentrically around a hollow shaft. The aim is to reduce the size and weight of the reduction gear and solve the problems of the conventional technology.

以下図について本考案の実施例を説明する。ヘ
ツド１は図示しない掘削機の本体に対して垂直に
昇降自在に支持されている。ヘツド１のフレーム
２上には、一側にモータＭが固定され、それの側
方にハウジング３が設けられている。ハウジング
３には垂直に中空軸４が軸支されている。この中
空軸の上端は排土管５に連結され、下端は図示し
ないドリルビツトに連結され、ドリルビツトによ
り掘削された土砂は水と共に中空軸４を上昇し、
排土管５を通して排出されるものとする。中空軸
４には、ハウジング３内上部において出力面歯車
６が被挿固着されている。また中空軸４にはハウ
ジング３内において軸筒７が相対回転自在に被挿
されている。軸筒７は上部に中空軸４に対して傾
斜した斜軸部８を有し、この斜軸部８に傾斜面歯
車９が相対回転自在に被挿されている。この傾斜
面歯車９の上面の歯は出力面歯車の歯に向斜して
噛合つている。軸筒７の下部外側には、ベアリン
グ１０を介して固定面歯車１１が相対回転自在に
被挿され、ハウジング３の底部に固定されてい
る。固定面歯車１１の歯は傾斜面歯車９の下面の
歯に向斜して噛合つている。しかして、固定面歯
車１１の歯数T₁は、傾斜面歯車９の下面の歯数
T₂より少なく、また出力面歯車６の歯数T₄は傾
斜面歯車９の上面の歯数T₃よりも少なく設定す
る。軸筒７の下端部は固定面歯車１１の下方へ延
出し、その外側に平歯車１２が固着されている。
この平歯車１２はフレーム２に軸着された連結歯
車１３を介してモータＭの回転軸の駆動歯車１４
に噛合され、これら３つの歯車１２，１３，１４
により動力伝達手段１５を構成している。 Embodiments of the present invention will be described below with reference to the figures. The head 1 is supported vertically to the main body of an excavator (not shown) so that it can be raised and lowered. A motor M is fixed on one side of a frame 2 of the head 1, and a housing 3 is provided on the side thereof. A hollow shaft 4 is vertically supported by the housing 3. The upper end of this hollow shaft is connected to the earth discharge pipe 5, and the lower end is connected to a drill bit (not shown), and the earth and sand excavated by the drill bit ascends the hollow shaft 4 together with water.
It is assumed that the earth is discharged through the earth discharge pipe 5. An output face gear 6 is inserted into and fixed to the hollow shaft 4 at the upper inside of the housing 3 . Further, a shaft cylinder 7 is inserted into the hollow shaft 4 so as to be relatively rotatable within the housing 3. The shaft cylinder 7 has an oblique shaft part 8 inclined with respect to the hollow shaft 4 at the upper part, and an inclined surface gear 9 is inserted into the oblique shaft part 8 so as to be relatively rotatable. The teeth on the upper surface of this inclined surface gear 9 mesh with the teeth of the output surface gear anti-slantingly. A fixed face gear 11 is inserted into the lower outer side of the shaft cylinder 7 via a bearing 10 so as to be relatively rotatable, and is fixed to the bottom of the housing 3. The teeth of the fixed surface gear 11 mesh with the teeth on the lower surface of the inclined surface gear 9 diagonally. Therefore, the number of teeth T ₁ of the fixed surface gear 11 is the number of teeth on the lower surface of the inclined surface gear 9.
_{The number of teeth T 4} _of the output surface gear 6 is set to be smaller than the number of teeth T ₃ on the upper surface of the inclined surface gear 9. The lower end of the shaft cylinder 7 extends below the fixed surface gear 11, and a spur gear 12 is fixed to the outside thereof.
This spur gear 12 is connected to a drive gear 14 of the rotating shaft of the motor M via a connecting gear 13 that is pivotally attached to the frame 2.
These three gears 12, 13, 14
The power transmission means 15 is constituted by this.

次に作用を説明する。モータＭの回転は動力伝
達手段１５を介して軸筒７に伝えられる。傾斜面
歯車９は、向斜して固定面歯車１１と噛合つてい
るので軸筒７の回転により揺動回転する。同様に
傾斜面歯車９は向斜して出力面歯車６と噛合つて
いるので、その揺動回動回転により出力面歯車６
を減速回転させる。この減速比Ｒは、下式で表わ
される。 Next, the effect will be explained. The rotation of the motor M is transmitted to the shaft cylinder 7 via the power transmission means 15. Since the inclined surface gear 9 meshes with the fixed surface gear 11 in a diagonal manner, it oscillates and rotates as the shaft cylinder 7 rotates. Similarly, since the inclined surface gear 9 meshes with the output surface gear 6 in a diagonal manner, its oscillating rotation causes the output surface gear 6 to
Rotate at a reduced speed. This reduction ratio R is expressed by the following formula.

Ｒ＝T₂・T₄／T₂・T₄−T₁・T₃ （T₁＜T₂，T₄＜T₃）（T₁：固定面歯車の歯数，T₂：傾斜面歯車の
下面歯数，T₃：傾斜面歯車の上面歯数，T₄：出
力面歯車の歯数）しかして、出力面歯車６と共に
中空軸４が回転し、その下端に連結された図示し
ないドリルビツトが回転して地中を掘削する。ヘ
ツド１は掘削に従つて下降する。 R= _T2・_T4 / _T2・_T4 − _T1・_T3 ( _T1 < _T2 , _T4 < _T3 ) ( _T1 : Number of teeth of fixed face gear, _T2 : Number of teeth of inclined face gear (number of teeth on the lower surface, T ₃ : number of teeth on the upper surface of the inclined surface gear, T ₄ : number of teeth on the output surface gear) The hollow shaft 4 rotates together with the output surface gear 6, and a drill bit (not shown) connected to the lower end of the hollow shaft 4 rotates. It rotates and excavates underground. The head 1 descends as the excavation progresses.

なお、本考案は図示の実施例に限定されるもの
ではなく、例えば水平掘削機にも適用可能である
し、また本実施例における動力伝達手段１５はベ
ルト、チエーンその他公知ものに代えることがで
きる。 Note that the present invention is not limited to the illustrated embodiment, and can be applied to, for example, a horizontal excavator, and the power transmission means 15 in this embodiment can be replaced with a belt, chain, or other known means. .

以上説明してきたように、本考案は、回転する
中空軸４の先端にドリルビツトを取付け、この中
空軸４を通して土砂を排出する地中掘削機におい
て、中空軸４の外側に、出力面歯車６を固着し、
また中空軸４の外側にそれの軸心に対して傾斜し
た斜軸部８を有する軸筒７を相対回転自在に被挿
し、斜軸部８の外側には傾斜面歯車９を固着し、
それの一面の歯を出力面歯車６に向斜して噛合
せ、また中空軸４に固定面歯車１１を相対回転自
在に被挿してフレーム２に固定し、これを傾斜面
歯車９の他側面の歯に向斜して噛合せ、軸筒７と
モータＭとを動力伝達手段１５により連結した構
成であるため、減速装置を構成する歯車群を中空
軸４のまわりに同心的に配列することができ、こ
れにより減速装置をコンパクトにすることができ
ると共に、構造が簡単化され、軽量化され、また
安価に提供することができるという効果が得られ
る。 As explained above, the present invention is an underground excavator in which a drill bit is attached to the tip of a rotating hollow shaft 4 and earth and sand is discharged through this hollow shaft 4. fixed,
Further, a shaft cylinder 7 having an oblique shaft portion 8 inclined with respect to the axis thereof is inserted into the outside of the hollow shaft 4 so as to be relatively rotatable, and an inclined surface gear 9 is fixed to the outside of the oblique shaft portion 8.
The teeth on one side of the gear are meshed with the output face gear 6 in a diagonal manner, and the fixed face gear 11 is inserted into the hollow shaft 4 so as to be relatively rotatable and fixed to the frame 2. Since the shaft cylinder 7 and the motor M are connected by the power transmission means 15, the gears constituting the speed reduction device can be arranged concentrically around the hollow shaft 4. As a result, the reduction gear device can be made compact, the structure can be simplified, the weight can be reduced, and it can be provided at low cost.

[Brief explanation of the drawing]

図面は本考案の実施の一例を示す縦断正面図で
ある。２…フレーム、４…中空軸、６…出力面歯車、
７…軸筒、８…斜軸部、９…傾斜面歯車、１１…
固定面歯車、１５…動力伝達手段、Ｍ…モータ。 The drawing is a longitudinal sectional front view showing an example of the implementation of the present invention. 2...Frame, 4...Hollow shaft, 6...Output face gear,
7... Shaft cylinder, 8... Oblique shaft portion, 9... Inclined surface gear, 11...
Fixed plane gear, 15...Power transmission means, M...Motor.

Claims

[Scope of utility model registration request]

In an underground excavator that attaches a drill bit to the tip of a rotating hollow shaft and discharges earth and sand through the hollow shaft, an output face gear is fixed to the outside of the hollow shaft, and a drill bit is attached to the outside of the hollow shaft relative to its axial center. A shaft cylinder having a diagonal shaft portion inclined at the same angle is inserted so as to be relatively rotatable, an inclined surface gear is relatively rotatably inserted on the outside of the diagonal shaft portion, and teeth on one side of the shaft cylinder are slanted to the output surface gear. Also, a fixed face gear is inserted into the hollow shaft so as to be relatively rotatable and fixed to the frame, and this is meshed diagonally with the teeth on the other side of the inclined face gear, so that the teeth of the fixed face gear The number of teeth of the output surface gear is set to be smaller than the number of teeth of the inclined surface gear that meshes with it, and the number of teeth of the output surface gear is set to be smaller than the number of teeth of the inclined surface gear that meshes with it, and the shaft cylinder and the motor are connected by a power transmission means. A deceleration device for an underground excavator, which is characterized by: