JPH0334342Y2 - - Google Patents
Info
- Publication number
- JPH0334342Y2 JPH0334342Y2 JP19057885U JP19057885U JPH0334342Y2 JP H0334342 Y2 JPH0334342 Y2 JP H0334342Y2 JP 19057885 U JP19057885 U JP 19057885U JP 19057885 U JP19057885 U JP 19057885U JP H0334342 Y2 JPH0334342 Y2 JP H0334342Y2
- Authority
- JP
- Japan
- Prior art keywords
- clutch
- front wheel
- shift member
- speed
- drive
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims description 26
- 230000003139 buffering effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000000994 depressogenic effect Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Arrangement And Driving Of Transmission Devices (AREA)
- Gear-Shifting Mechanisms (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、操向自在な前輪への伝動系に、後輪
駆動速度に略等しい駆動速度で伝動する標準駆動
状態と、後輪駆動速度より大きい駆動速度で伝動
する増速駆動状態に切換えるクラツチ式の前輪変
速装置を備えた農用トラクタの前輪変速操作構造
に関する。[Detailed description of the invention] [Industrial application field] The present invention provides a transmission system for steerable front wheels with a standard drive state in which power is transmitted at a drive speed approximately equal to the rear wheel drive speed, and a rear wheel drive speed The present invention relates to a front wheel speed change operation structure for an agricultural tractor equipped with a clutch type front wheel speed change device that switches to an increased speed drive state in which transmission is performed at a higher drive speed.
農用トラクタの前輪を前述のように標準駆動状
態と増速駆動状態とに切換操作するクラツチ式の
構造としては、例えば、実開昭60−102133号公報
に開示されているがこれは常咬式のギヤ機構と２
個の油圧式の摩擦クラツチとで構成され、この摩
擦クラツチの入切操作によつて常咬式のギヤ機構
内を伝達されるエンジン動力の径路を変更して変
速操作する機構であるが、これは次のような問題
を持つていた。
A clutch-type structure for switching the front wheels of an agricultural tractor between the standard drive state and the accelerated drive state as described above is disclosed, for example, in Japanese Utility Model Application Publication No. 102133/1980, but this is a permanent-bit type structure. gear mechanism and 2
This mechanism consists of two hydraulic friction clutches, and by operating these friction clutches, the path of the engine power transmitted through the permanent gear mechanism is changed to change the speed. had the following problem.
前述の従来構造においては、変速操作を１アク
シヨンで素早く行える点、及び、その構造上の点
から標準及び増速の両駆動状態の変速操作に各々
油圧式の摩擦クラツチを用いていたのであるが、
農用トラクタにおいて、前輪を増速駆動状態に変
速操作するのは畦際で小回転半径で方向転換する
場合や、目前の危険を急旋回して回避する場合等
なので、この変速位置の使用頻度は一般に少な
い。一方、前輪を標準駆動状態に変速操作するの
は通常の作業時又は路上走行時であるが、このよ
うな場合は一般に変速操作を素早く行わねばなら
ない機会は少ないのであるが、前述のような理由
により一般にコスト高で、かつ、その油圧系路等
により装置全体の構造が複雑化しやすい油圧式の
摩擦クラツチを用いていた為に、前輪変速装置の
コスト高及び構造の複雑化を招いていた。
In the above-mentioned conventional structure, a hydraulic friction clutch was used for shifting operations in both the standard and increased speed driving states, because the gear shifting operation could be performed quickly in one action, and from the viewpoint of the structure. ,
In agricultural tractors, the front wheels are shifted to an increased speed drive state when changing direction with a small turning radius at the edge of a ridge, or when making a sharp turn to avoid an immediate danger, so the frequency of use of this shift position is Generally less. On the other hand, the front wheels are shifted to the standard drive state during normal work or when driving on the road, but in such cases there are generally few opportunities to shift gears quickly, but for the reasons mentioned above. Therefore, a hydraulic friction clutch is generally used, which is expensive and tends to complicate the overall structure of the device due to its hydraulic path, etc., resulting in high cost and complicated structure of the front wheel transmission.
ここで本考案の目的は、前記前輪変速装置にお
いてコストの低減及び構造の簡略化を図ることに
ある。 An object of the present invention is to reduce the cost and simplify the structure of the front wheel transmission.
本考案の特徴は冒記した農用トラクタの前輪変
速操作構造において、前輪変速装置における標準
駆動系の第１クラツチ及び増速駆動系の第２クラ
ツチを、１個のシフト部材の正逆作動によつて択
一的に入り操作される咬合式のクラツチに構成す
ると共に、前記シフト部材を第１クラツチ入り作
動側に付勢し、かつ、シフト部材が咬合いを完了
する前から接当作用する緩衝用弾性体を第１クラ
ツチに備えてあることにあり、その作用及び効果
は次のとおりである。
The feature of the present invention is that in the above-mentioned front wheel shift operation structure for an agricultural tractor, the first clutch of the standard drive system and the second clutch of the speed increasing drive system in the front wheel transmission are controlled by the forward and reverse operation of a single shift member. The clutch is configured as an occlusal type clutch that is selectively engaged and operated, and the shift member is biased toward the first clutch engagement operation side, and a buffer that acts in contact even before the shift member completes occlusion. The first clutch is provided with an elastic body, and its functions and effects are as follows.
前述のように、従来２個あつた油圧式の摩擦ク
ラツチの両者を油圧式に比べ低コストである機械
式の咬合式のクラツチに置き換えることによつて
コスト低減が図れると共に、圧油供給用の油圧ポ
ンプ及び油圧径路が不要となつて装置の構造が簡
略化されることとなつた。
As mentioned above, by replacing both of the conventional two hydraulic friction clutches with mechanical interlocking clutches, which are cheaper than hydraulic clutches, it is possible to reduce costs and reduce the cost of supplying pressure oil. This eliminates the need for a hydraulic pump and hydraulic path, simplifying the structure of the device.
又、シフト部材は標準駆動系の第１クラツチ入
り作動側に付勢しているので通常は、前輪は標準
駆動状態となる。シフト部材を第２クラツチ入り
側に操作した増速駆動状態においての操作をやめ
ると前述の付勢力によつて、シフト部材は第１ク
ラツチ入り側へ移行するのであるが、咬合う際の
衝撃及び騒音は緩衝用弾性体により吸収されてし
まうのである。 Further, since the shift member biases the standard drive system toward the first clutch engagement side, the front wheels are normally in the standard drive state. When the shift member is stopped in the speed-up driving state where the second clutch is engaged, the shift member shifts to the first clutch engaged side due to the aforementioned biasing force, but due to the impact and The noise is absorbed by the damping elastic body.
以上説明したように、所期の目的である農用ト
ラクタにおける前輪変速装置のコスト低減及び構
造の簡略化を行うことができたと同時に、変速操
作時の衝撃及び騒音も抑えた構造となつた。
As explained above, the desired objective of reducing the cost and simplifying the structure of the front wheel transmission for agricultural tractors has been achieved, and at the same time, the structure has been created that suppresses shock and noise during gear shifting operations.
又、２個のクラツチを１つのシフト部材にて択
一的に入り操作する構造としたので両クラツチが
同時に入り状態となるおそれは全くなく、二重伝
動による装置の破損も防止できる構造となつた。 In addition, since the two clutches are selectively engaged using one shift member, there is no risk that both clutches will be engaged at the same time, and the structure can prevent damage to the device due to double transmission. Ta.
以下、本考案の実施例である農用トラクタにつ
いて図面に基づいて説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An agricultural tractor that is an embodiment of the present invention will be described below with reference to the drawings.
第５図に示すように、左右一対の操向型の前輪
１，１及び後輪２，２を各々駆動自在に支持した
機体フレーム３にエンジン４、主クラツチ５、ミ
ツシヨンケース６及び操縦部７を塔載し、機体後
部にロータリー耕転装置等の各種作業装置を昇降
自在に連結するための上下に揺動駆動自在なリフ
トアーム８及び作業装置に動力を伝達するPTO
軸９を設けて四輪駆動型の農用トラクタを構成し
ている。 As shown in FIG. 5, a fuselage frame 3 that supports a pair of left and right steering type front wheels 1, 1 and rear wheels 2, 2 in a freely drivable manner includes an engine 4, a main clutch 5, a transmission case 6, and a control section. 7, and a lift arm 8 that can be driven up and down to freely swing up and down to connect various working devices such as a rotary tiller to the rear of the machine, and a PTO that transmits power to the working devices.
A four-wheel drive agricultural tractor is constructed by providing a shaft 9.
次に農用トラクタの動力伝達系統及び前輪変速
装置１０について詳述すると、第１，２，５図に
示すように、エンジン４からの動力は主クラツチ
５、動力伝達軸１１を介してミツシヨンケース６
内の主変速装置及び副変速装置（以上、図示せ
ず）に伝達され変速操作されて後輪２，２を駆動
すると共に、副変速装置のギヤ１２ａ，１２ｂか
ら分岐した動力は前輪変速装置１０内の前輪変速
ミツシヨン部１４に送られ変速操作されて、前輪
出力軸１５を介して前輪デフ機構１ａに送られ
て、前輪１，１を駆動するように構成している。 Next, the power transmission system and front wheel transmission 10 of the agricultural tractor will be described in detail. As shown in FIGS. 6
The power is transmitted to the main transmission and the auxiliary transmission (not shown) in the front wheel transmission 10 and is operated to drive the rear wheels 2, 2, and the power branched from the gears 12a, 12b of the auxiliary transmission is transmitted to the front wheel transmission 10. It is configured to be sent to the front wheel transmission transmission transmission unit 14 in the inner part for a speed change operation, and then sent to the front wheel differential mechanism 1a via the front wheel output shaft 15 to drive the front wheels 1, 1.
前記前輪変速ミツシヨン部１４について詳述す
ると、第１図及び第２図に示すように、副変速装
置のギヤ１２ａ，１２ｂと咬合う第１受動ギヤ１
３及び第２受動ギヤ１６を前輪出力軸１５に遊嵌
すると共に、第１及び第２受動ギヤ１３，１６の
間にスプライン構造にて前輪出力軸１５と一体回
転自在、かつ、軸芯方向に移動可能なシフト部材
１７を前輪出力軸１５に外嵌している。このシフ
ト部材１７の左右両面に凸状の係合部１７ａ，１
７ｂを設け、シフト部材１７を軸芯方向に動かし
て前記係合部１７ａ，１７ｂを第１受動ギヤ１３
及び第２受動ギヤ１６の凸状の係合部１３ａ，１
６ａに係合離脱させることによつて咬合式の標準
駆動系の第１クラツチ１８、増速駆動系の第２ク
ラツチ１９を構成している。第１クラツチ１８を
入り状態とすると動力は副変速装置のギヤ１２
ａ、第１受動ギヤ１３、シフト部材１７を介して
標準駆動状態で前輪出力軸１５へ伝えられ、第２
クラツチ１９を入り状態とすると動力は副変速装
置のギヤ１２ｂ、第２受動動ギヤ１６、シフト部
材１７を介して増速駆動状態で前輪出力軸１５に
伝えられる。 To explain the front wheel transmission transmission part 14 in detail, as shown in FIG. 1 and FIG.
3 and the second driven gear 16 are loosely fitted to the front wheel output shaft 15, and a spline structure is provided between the first and second driven gears 13 and 16 so that they can freely rotate together with the front wheel output shaft 15 and in the axial direction. A movable shift member 17 is fitted onto the front wheel output shaft 15. Convex engaging portions 17a, 1 on both left and right sides of this shift member 17
7b is provided, and by moving the shift member 17 in the axial direction, the engaging portions 17a, 17b are connected to the first passive gear 13.
and the convex engaging portions 13a, 1 of the second passive gear 16.
By engaging and disengaging 6a, a first clutch 18 of an interlocking standard drive system and a second clutch 19 of a speed-increasing drive system are constructed. When the first clutch 18 is engaged, the power is transferred to the gear 12 of the auxiliary transmission.
a, is transmitted to the front wheel output shaft 15 in the standard drive state via the first passive gear 13 and the shift member 17;
When the clutch 19 is engaged, power is transmitted to the front wheel output shaft 15 through the gear 12b of the auxiliary transmission, the second passive gear 16, and the shift member 17 in an accelerated driving state.
次にシフト部材１７の操作機構及び変速時の緩
衝機構等について詳述すると、第１図に示すよう
に、シフト部材１７をバネ２０によつて第１クラ
ツチ１８入り側に付勢すると共に、第４図に示す
ようにシフト部材１７と第２受動ギヤ１６の係合
部１７ｂ，１６ａを平面視で台形状としてテーパ
ーを設けて、回転時にテーパー部で軸芯方向に回
転力の分力が作用してシフト部材１７が第２受動
ギヤ１６から離れやすいように構成している。 Next, the operation mechanism of the shift member 17 and the buffer mechanism during gear shifting will be described in detail.As shown in FIG. As shown in FIG. 4, the engaging portions 17b and 16a of the shift member 17 and the second passive gear 16 are trapezoidal in plan view and tapered so that a component of the rotational force acts in the axial direction at the tapered portion during rotation. The shift member 17 is configured to be easily separated from the second driven gear 16.
このシフト部材１７はシフター２１及びレリー
ズワイヤ２２を介してサイドブレーキペダル２
３，２３と連動連結されている。図に示すように
レリーズワイヤ２２はアウターワイヤを一方のサ
イドブレーキペダル２３に、インナーワイヤを他
方のサイドブレーキペダル２３に接続されてお
り、片方のサイドブレーキペダル２３を踏み操作
した場合にのみインナーワイヤが引き操作されて
シフト部材１７が第２クラツチ１９入り側に操作
されるのである。第１図は前述のように片側のサ
イドブレーキペダル２３を踏み操作し、第２クラ
ツチ１９を入り操作、つまり増速駆動状態として
いる図である。 This shift member 17 is connected to the handbrake pedal 2 via a shifter 21 and a release wire 22.
3 and 23 are interlocked and connected. As shown in the figure, the release wire 22 has an outer wire connected to one side brake pedal 23 and an inner wire connected to the other side brake pedal 23.The inner wire is connected only when one side brake pedal 23 is depressed. is pulled, and the shift member 17 is operated to the engagement side of the second clutch 19. FIG. 1 is a diagram in which the handbrake pedal 23 on one side is depressed and the second clutch 19 is engaged, that is, the speed-increasing drive state is set, as described above.
この片側のサイドブレーキペダル２３の踏み操
作をやめると、バネ２０の付勢力及び前述の回転
力の分力によつて、第２図に示すようにシフト部
材１７は第１クラツチ１８入り側に移行する。第
１受動ギヤ１３には緩衝用弾性体２４であるゴム
リングが設けられており、このゴムリング２４は
シフト部材１７と第１受動ギヤ１３の両係合部１
７ａ，１３ａの咬合いが完了する前からシフト部
材１７に接当して咬合い時の衝撃及び騒音を抑え
ている。 When you stop depressing the side brake pedal 23, the biasing force of the spring 20 and the aforementioned rotational force cause the shift member 17 to shift to the engaging side of the first clutch 18, as shown in FIG. do. The first passive gear 13 is provided with a rubber ring that is a buffering elastic body 24, and this rubber ring 24 is connected to both the engagement portions 1 of the shift member 17 and the first passive gear 13.
Even before the occlusion of 7a and 13a is completed, it comes into contact with the shift member 17 to suppress the impact and noise during occlusion.
又、このゴムリング２４には第３図に示すよう
に半径方向及び内面の軸芯方向の数箇所に潤滑油
用の油路２４ａが設けられており、第１受動ギヤ
１３ボス部付近での潤滑油不足が防止されると共
に、前記シフター２１支持部にも吸音用のゴム部
材２５を設けて変速操作時の衝撃及び騒音を抑え
ている。 In addition, as shown in FIG. 3, this rubber ring 24 is provided with oil passages 24a for lubricating oil at several locations in the radial direction and the axial direction of the inner surface, and the oil passages 24a are provided at several locations in the radial direction and the axial direction of the inner surface. In addition to preventing a lack of lubricating oil, a sound-absorbing rubber member 25 is also provided on the support portion of the shifter 21 to suppress impact and noise during gear shifting operations.
図面は本考案に係る農用トラクタの前輪変速操
作構造の実施例を示し、第１図は前輪変速装置を
増速駆動側に操作した状態を示す側面図、第２図
は前輪変速装置を標準駆動側に操作した状態を示
す側面図、第３図は緩衝用弾性体の縦断面正面
図、第４図は第１図におけるＡ−Ａ方向からの矢
視図、第５図は農用トラクタの全体側面図であ
る。
１……前輪、１０……前輪変速装置、１７……
シフト部材、１８……第１クラツチ、１９……第
２クラツチ、２４……緩衝用弾性体。
The drawings show an embodiment of the front wheel speed change operation structure for an agricultural tractor according to the present invention. FIG. 1 is a side view showing the front wheel speed change device operated to the speed increasing drive side, and FIG. 2 is a side view showing the front wheel speed change device operated to the speed increasing drive side. FIG. 3 is a longitudinal cross-sectional front view of the shock absorbing elastic body, FIG. 4 is a view taken from the direction of A-A in FIG. 1, and FIG. 5 is the entire agricultural tractor. FIG. 1...Front wheel, 10...Front wheel transmission, 17...
Shift member, 18...first clutch, 19...second clutch, 24...buffer elastic body.
Claims (1)
速度に略等しい駆動速度で伝動する標準駆動状態
と、後輪駆動速度より大きい駆動速度で伝動する
増速駆動状態に切換えるクラツチ式の前輪変速装
置１０を備えた農用トラクタの前輪変速操作構造
であつて、前記前輪変速装置１０における標準駆
動系の第１クラツチ１８及び増速駆動系の第２ク
ラツチ１９を、１個のシフト部材１７の正逆作動
によつて択一的に入り操作される咬合式のクラツ
チに構成すると共に、前記シフト部材１７を第１
クラツチ１８入り作動側に付勢し、かつ、シフト
部材１７が咬合いを完了する前から接当作用する
緩衝用弾性体２４を第１クラツチ１８に備えてあ
る農用トラクタの前輪変速操作構造。 The transmission system for the steerable front wheels 1, 1 is a clutch type that switches between a standard drive state in which power is transmitted at a drive speed approximately equal to the rear wheel drive speed, and an increased speed drive state in which power is transmitted at a drive speed greater than the rear wheel drive speed. This is a front wheel shift operation structure for an agricultural tractor equipped with a front wheel transmission 10, in which a first clutch 18 of a standard drive system and a second clutch 19 of an increased speed drive system in the front wheel transmission 10 are connected to one shift member. The shift member 17 is configured as an interlocking type clutch that is selectively engaged and operated by forward and reverse operation of the shift member 17.
A front wheel speed change operation structure for an agricultural tractor, in which a first clutch 18 is provided with a buffering elastic body 24 that biases the clutch 18 toward the operating side and comes into contact with the shift member 17 before the shift member 17 completes engagement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19057885U JPH0334342Y2 (en) | 1985-12-10 | 1985-12-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19057885U JPH0334342Y2 (en) | 1985-12-10 | 1985-12-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6297033U JPS6297033U (en) | 1987-06-20 |
| JPH0334342Y2 true JPH0334342Y2 (en) | 1991-07-22 |
Family
ID=31143925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19057885U Expired JPH0334342Y2 (en) | 1985-12-10 | 1985-12-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0334342Y2 (en) |
-
1985
- 1985-12-10 JP JP19057885U patent/JPH0334342Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6297033U (en) | 1987-06-20 |
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