JP3527048B2 - Agricultural work equipment steering device - Google Patents
Agricultural work equipment steering deviceInfo
- Publication number
- JP3527048B2 JP3527048B2 JP6046997A JP6046997A JP3527048B2 JP 3527048 B2 JP3527048 B2 JP 3527048B2 JP 6046997 A JP6046997 A JP 6046997A JP 6046997 A JP6046997 A JP 6046997A JP 3527048 B2 JP3527048 B2 JP 3527048B2
- Authority
- JP
- Japan
- Prior art keywords
- case
- transmission shaft
- case portion
- steering device
- cylindrical
- 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.)
- Expired - Fee Related
Links
Landscapes
- Arrangement And Driving Of Transmission Devices (AREA)
- General Details Of Gearings (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、湿田用トラクタ等
の農用作業機の操向装置に係り、詳しくは、駆動操向輪
側の操向ハブケースと機体側の伝動軸ケースとのシール
性能を向上させる技術に関する。
【０００２】
【従来の技術】農用作業機の操向装置としては、特開平
８‐１４５１５０号公報の図２に示されたもののよう
に、操向軸心を兼ねた車輪駆動用のキングピン軸（符号
６）を備えた車輪側の車軸ケース（符号１）と、操向車
輪駆動用の伝動軸を備えた機体側の伝動軸ケース（符号
２）とを、この伝動軸ケースが車軸ケースに内嵌する状
態でキングピン軸回りに相対回動自在に連結してあるも
のが知られている。この構造では、車軸ケースにおける
キングピン軸を囲繞する筒ケース部分（符合１ａ）の上
端部と伝動軸ケースとの間にシール部材を配設してあ
る。
【０００３】
【発明が解決しようとする課題】農用作業機では、湿田
での代掻き作業等では、車軸ケースが水没する程車輪が
深く沈んだ状態で走行することが多く、前述したシール
部材は泥水に晒された状態で使用されることが殆どであ
るため、シール寿命の点では比較的厳しいものがある。
車軸ケースと伝動軸ケースとの嵌合公差やキングピン軸
のスラスト方向の公差等の不可避な公差ガタにより、シ
ール寿命が不利になる場合も考えられるので、上記シー
ル構造には改善の余地が残されているものであった。本
発明の目的は、上述した両ケースの嵌合構造の見直しに
より、シール部材の寿命を延ばせるようにシール機能を
強化する点にある。
【０００４】
【課題を解決するための手段】
〔構成〕第１発明は、操向軸心を兼ねた車輪駆動用のキ
ングピン軸を備えた車輪側の車軸ケースと、操向車輪駆
動用の伝動軸を備えた機体側の伝動軸ケースとを、この
伝動軸ケースが車軸ケースに内嵌する状態でキングピン
軸回りに相対回動自在に連結してある農用作業機の操向
装置において、車軸ケースにおけるキングピン軸を囲繞
する筒ケース部分の上端部内側に、伝動軸ケースとの間
に作用するシール部材を配設し、筒ケース部分の上端部
を外囲する筒状の突出ケース部分を伝動軸ケースに形成
するとともに、その突出ケース部分と筒ケース部分の外
面との間に作用する補助シール部材を配設してあること
を特徴とする。
【０００５】〔作用〕請求項１の構成によれば、車軸ケ
ースの筒ケース部分上端の内側にシール部材が、そして
外側に補助シール部材が夫々配置されたダブルシール構
造になり、従来のシングルシール構造に比べてシール機
能が明に改良される。加えて、外側に位置する補助シー
ル部材は、下向きに突出する突出ケース部分に内嵌配置
されているので、泥水等は下方から及んでくる状態とな
る。
【０００６】シール部材に上方から泥水が及ぶ従来の構
造では、その部分が湿田から上方に浮上した状態でも泥
水がシール部材上に残って重力による侵入おそれが存在
するが、本願の構造では、湿田から上方に浮上した状態
では、重力によってシール部分の泥水が流れ落ちて侵入
おそれが先ず解消される点で有利である。従って、内側
のシール部材の寿命は当然延びるとともに、外側の補助
シール部材もその下向き配置によって従来のシール部材
よりもその寿命を延ばすことが可能になり、全体として
シール寿命を飛躍的に延ばせるようになる。
【０００７】〔効果〕請求項１に記載の農用作業機の操
向装置では、伝動軸ケースに筒状の突出ケースを形成す
る程度の改造により、伝動及び操向構造を変えることな
く車軸ケースと伝動軸ケースとのシール性を向上でき、
泥水からの伝動部保護の強化やシール部材の寿命が延ば
せて耐久性を改善することができた。
【０００８】
【発明の実施の形態】以下に、本発明の実施の形態を図
面に基づいて説明する。図１に農用作業機の一例である
トラクタが示され、１は駆動操向前輪、２は駆動後輪、
３はエンジン、４はミッションケース、５は機体であ
る。
【０００９】図２，図３に前輪１の支持構造が示されて
いる。６は機体５に固定の前輪駆動用の伝動軸ケースで
あり、横向きの伝動軸７を囲繞するパイプケース部分６
Ａと、操向用の内筒ケース部分６Ｂとを備えている。８
は前輪１取付け用のハブ９を回転自在に支持する前車軸
ケースであり、ハブ９にスプライン外嵌された大径ベベ
ルギヤ１０を囲繞するハブケース部分８Ａと、前記内筒
ケース部分６Ｂの外側に被さる外筒ケース部分８Ｂとを
備えている。
【００１０】内筒ケース部分６Ｂと外筒ケース部分８Ｂ
とは上下２個の支持ベアリング１１，１２によって相対
回動自在に連結されているとともに、伝動軸７と大径ベ
ベルギヤ１０とを連動させるキングピン軸１３を、内筒
ケース部分６Ｂのベアリング１４と外筒ケース部分８Ｂ
のベアリング１５とによって回転自在に支持してある。
従って、前輪１はキングピン軸１３の軸心である操向軸
心Ｐを中心に操舵されるものであり、キングピン軸１３
が前輪駆動用軸と操向軸心とを兼ねている。
【００１１】伝動軸ケース６と前車軸ケース８とは、外
筒ケース部分８Ｂの上端部内側と内筒ケース部分６Ｂと
の間に配設された第１シールリング（シール部材の一
例）１６によってシールされている。そして、外筒ケー
ス部分８Ｂの上端部を外囲する筒状の突出ケース部分６
Ｃを内筒ケース部分６Ｂに形成するとともに、その下向
きの突出ケース部分６Ｃと外筒ケース部分８Ｂの外面と
の間に作用する第２シールリング（補助シール部材の一
例）１７を配設してある。
【００１２】第１シールリング１６は、複数のリップを
備えた本格的なオイルシール構造のものであり、第２シ
ールリング１７はＯ−リング等の簡易なシール構造とし
てある。このように、伝動軸ケース６が前車軸ケース８
の内外でラップするように被せての二重シール構造を採
ることにより、泥水は第２シールリング１７の下方から
及ぶ状態になり、第１シールリング１６に上方から泥水
が及ぶ従来手段に比べて泥水の侵入防止作用が大幅に改
善され、外筒ケース部分８Ｂ内部への泥水侵入防止は勿
論、第１シールリング１６の寿命を飛躍的に延ばして耐
久性や信頼性を大きく改善できるのである。
【００１３】尚、外筒ケース部分８Ｂ下端の開放部は、
プラグキャップ１８の圧入によって水封状態にしてあ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering apparatus for an agricultural work machine such as a tractor for wet fields, and more particularly, to a steering hub case and a body of a driving steering wheel. To improve the sealing performance with the side transmission shaft case. 2. Description of the Related Art As a steering device for an agricultural working machine, as shown in FIG. 2 of Japanese Patent Application Laid-Open No. 8-145150, a kingpin shaft for driving a wheel which also serves as a steering axis (refer to FIG. 2). An axle case (symbol 1) on the wheel side having a reference numeral 6) and a transmission shaft case (symbol 2) on the fuselage side having a transmission shaft for driving the steered wheels are provided inside the axle case. It is known that they are connected so as to be relatively rotatable around a kingpin axis in a fitted state. In this structure, a seal member is provided between an upper end portion of a cylindrical case portion (reference numeral 1a) surrounding a kingpin shaft of an axle case and a transmission shaft case. [0003] In an agricultural work machine, in a scraping operation in a wetland, etc., the wheel often travels in a state where the wheels are deeply sunk so that the axle case becomes submerged. In most cases, the seal life is relatively severe because it is used in a state where the seal is exposed.
Inevitable tolerance play such as the fitting tolerance between the axle case and the transmission shaft case and the tolerance in the thrust direction of the kingpin shaft may degrade the seal life.Therefore, there is room for improvement in the above seal structure. Was what it was. An object of the present invention is to enhance the sealing function so as to extend the life of the sealing member by reviewing the fitting structure of the two cases described above. A first aspect of the present invention is directed to a wheel-side axle case including a wheel driving kingpin shaft also serving as a steering axis, and a transmission for driving a steering wheel. An axle case is provided in a steering device for an agricultural work machine, wherein a transmission shaft case on the machine body side having a shaft is relatively rotatably connected around a kingpin axis with the transmission shaft case being fitted inside the axle case. A seal member acting between the transmission shaft case and the cylindrical case portion surrounding the kingpin shaft is disposed inside the cylindrical case portion, and the cylindrical projecting case portion surrounding the upper end portion of the cylinder case portion is disposed on the transmission shaft. It is characterized in that it is formed on the case and that an auxiliary seal member acting between the projecting case portion and the outer surface of the cylindrical case portion is provided. According to the construction of the first aspect, the conventional single seal structure has a double seal structure in which the seal member is arranged inside the upper end of the cylindrical case portion of the axle case and the auxiliary seal member is arranged outside the upper end. The sealing function is clearly improved compared to the structure. In addition, since the auxiliary seal member located on the outside is fitted inside the protruding case portion that protrudes downward, muddy water and the like reach a state from below. In the conventional structure in which muddy water reaches the seal member from above, there is a possibility that the muddy water will remain on the seal member even if the portion floats upward from the wetland, and there is a risk of intrusion due to gravity. In the state of floating upward from above, the muddy water in the seal portion flows down due to gravity, which is advantageous in that the risk of intrusion is first eliminated. Therefore, the service life of the inner seal member is naturally extended, and the outer auxiliary seal member can be extended in its life downward as compared with the conventional seal member by its downward arrangement. Become. In the steering apparatus for an agricultural work machine according to the first aspect, the axle case can be changed without changing the transmission and steering structure by modifying the transmission shaft case to such an extent that a cylindrical projecting case is formed. Sealability with the transmission shaft case can be improved,
The protection of the transmission section from muddy water was enhanced, and the life of the seal member was extended, so that the durability was improved. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a tractor that is an example of an agricultural work machine, where 1 is a front wheel for driving and steering, 2 is a rear wheel for driving,
Reference numeral 3 denotes an engine, 4 denotes a transmission case, and 5 denotes an airframe. 2 and 3 show a support structure for the front wheel 1. FIG. Reference numeral 6 denotes a transmission shaft case fixed to the body 5 for driving the front wheels, and a pipe case portion 6 surrounding the transmission shaft 7 in the horizontal direction.
A and a steering inner cylinder case portion 6B. 8
A front axle case rotatably supports a hub 9 for mounting the front wheel 1, and covers a hub case portion 8A surrounding a large-diameter bevel gear 10 which is splined to the hub 9 and an outer side of the inner cylinder case portion 6B. And an outer cylinder case portion 8B. Inner cylinder case 6B and outer cylinder case 8B
Is connected to the upper and lower two support bearings 11 and 12 so as to be relatively rotatable, and the kingpin shaft 13 for interlocking the transmission shaft 7 and the large-diameter bevel gear 10 is connected to the bearing 14 of the inner cylinder case 6B. Tube case part 8B
And is rotatably supported by the bearing 15.
Therefore, the front wheel 1 is steered about the steering axis P which is the axis of the kingpin shaft 13,
Serves as both the front wheel drive shaft and the steering axis. The transmission shaft case 6 and the front axle case 8 are connected by a first seal ring (an example of a sealing member) 16 disposed between the inside of the upper end of the outer cylinder case portion 8B and the inner cylinder case portion 6B. Sealed. Then, a cylindrical protruding case portion 6 surrounding the upper end of the outer cylinder case portion 8B
C is formed on the inner cylindrical case portion 6B, and a second seal ring (an example of an auxiliary seal member) 17 acting between the downward protruding case portion 6C and the outer surface of the outer cylindrical case portion 8B is provided. is there. The first seal ring 16 has a full-scale oil seal structure having a plurality of lips, and the second seal ring 17 has a simple seal structure such as an O-ring. Thus, the transmission shaft case 6 is connected to the front axle case 8.
The muddy water is spread from below the second seal ring 17 by adopting a double seal structure in which the muddy water is wrapped inside and outside of the first seal ring 16 as compared with the conventional means in which the muddy water spreads from above to the first seal ring 16. The effect of preventing the intrusion of muddy water is greatly improved, so that the intrusion of muddy water into the outer cylinder case portion 8B can be prevented, and also the life of the first seal ring 16 can be drastically increased, and the durability and reliability can be greatly improved. Incidentally, the opening at the lower end of the outer cylinder case portion 8B is
The plug cap 18 is in a water sealed state by press fitting.
【図面の簡単な説明】 【図１】農用トラクタの側面図 【図２】前輪支持部の構造を示す断面図 【図３】前輪支持部の要部を示す断面図 【符号の説明】 ６ 伝動軸ケース ６Ｃ 突出ケース部分 ７ 伝動軸 ８ 車軸ケース ８Ｂ 筒ケース部分 １３ キングピン軸 １６ シール部材 １７ 補助シール部材 Ｐ 操向軸心[Brief description of the drawings] FIG. 1 is a side view of an agricultural tractor. FIG. 2 is a cross-sectional view showing the structure of a front wheel support. FIG. 3 is a cross-sectional view showing a main part of a front wheel support portion. [Explanation of symbols] 6 Transmission shaft case 6C Projecting case part 7 Transmission shaft 8 axle case 8B tube case part 13 Kingpin shaft 16 Sealing member 17 Auxiliary seal member P Steering axis
フロントページの続き (56)参考文献 実開 昭59−23422（ＪＰ，Ｕ) 実開 昭53−126134（ＪＰ，Ｕ) 実開 昭52−52235（ＪＰ，Ｕ) 実開 昭57−168425（ＪＰ，Ｕ) 実開 昭57−103234（ＪＰ，Ｕ) 実開 昭53−66736（ＪＰ，Ｕ) 実開 昭58−19827（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B60K 17/30 B62D 7/18 F16H 57/02 - 57/04 Continuation of the front page (56) References Japanese Utility Model Showa Sho 234-2422 (JP, U) Japanese Utility Model Showa 53-126134 (JP, U) Japanese Utility Model Showa 52-52235 (JP, U) Japanese Utility Model Showa 57-168425 (JP) , U) Japanese Utility Model Application 57-103234 (JP, U) Japanese Utility Model Application 53-66736 (JP, U) Japanese Utility Model Application 58-19827 (JP, U) (58) Fields surveyed (Int. Cl. 7 , DB Name) B60K 17/30 B62D 7/18 F16H 57/02-57/04
Claims (1)
ン軸を備えた車輪側の車軸ケースと、操向車輪駆動用の
伝動軸を備えた機体側の伝動軸ケースとを、この伝動軸
ケースが前記車軸ケースに内嵌する状態で前記キングピ
ン軸回りに相対回動自在に連結してある農用作業機の操
向装置であって、 前記車軸ケースにおける前記キングピン軸を囲繞する筒
ケース部分の上端部内側に、前記伝動軸ケースとの間に
作用するシール部材を配設し、 前記筒ケース部分の上端部を外囲する筒状の突出ケース
部分を前記伝動軸ケースに形成するとともに、その突出
ケース部分と前記筒ケース部分の外面との間に作用する
補助シール部材を配設してある農用作業機の操向装置。(1) A wheel-side axle case provided with a kingpin shaft for driving a wheel, which also serves as a steering axis, and a fuselage provided with a transmission shaft for driving a steered wheel. A transmission shaft case, wherein the transmission shaft case is fitted inside the axle case so as to be relatively rotatably connected around the kingpin axis, and the steering device for an agricultural work machine, A seal member that acts between the transmission shaft case and the inside of an upper end portion of a cylindrical case portion surrounding the kingpin shaft is disposed, and a cylindrical projecting case portion surrounding the upper end portion of the cylindrical case portion is provided. A steering device for an agricultural working machine, wherein the steering device is formed on the transmission shaft case, and further includes an auxiliary seal member disposed between the projecting case portion and an outer surface of the cylindrical case portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6046997A JP3527048B2 (en) | 1997-03-14 | 1997-03-14 | Agricultural work equipment steering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6046997A JP3527048B2 (en) | 1997-03-14 | 1997-03-14 | Agricultural work equipment steering device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10250391A JPH10250391A (en) | 1998-09-22 |
| JP3527048B2 true JP3527048B2 (en) | 2004-05-17 |
Family
ID=13143172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6046997A Expired - Fee Related JP3527048B2 (en) | 1997-03-14 | 1997-03-14 | Agricultural work equipment steering device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3527048B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4101126B2 (en) | 2003-06-26 | 2008-06-18 | 株式会社クボタ | Steering wheel drive structure of work vehicle |
| JP6410629B2 (en) * | 2015-02-16 | 2018-10-24 | 住友重機械工業株式会社 | Seal structure and gear device |
-
1997
- 1997-03-14 JP JP6046997A patent/JP3527048B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10250391A (en) | 1998-09-22 |
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