JPH0196571U

JPH0196571U -

Info

Publication number: JPH0196571U
Application number: JP19132987U
Authority: JP
Priority date: 1987-12-18
Filing date: 1987-12-18
Publication date: 1989-06-27
Anticipated expiration: 2002-12-18
Also published as: JPH0613415Y2

Description

[Brief explanation of the drawing]

第１図〜第５図は本考案の第１実施例を示し、
第１図Ａは中立状態を示す同時噛み合い防止機構
の側面図、第１図Ｂは第１図ＡのＡ―Ａ矢視断面
図、第２図Ａは変速状態を示す同時噛み合い防止
機構の側面図、第２図Ｂは第２図ＡのＢ―Ｂ矢視
断面図、第３図は要部のみを示す前部ミツシヨン
ケースの縦断側面図、第４図は要部のみを示す前
部ミツシヨンケースの縦断後面図、第５図は農用
トラクタの概略側面図である。第６図〜第１０図
は本考案の第２実施例を示し、第６図は中心線よ
りも右側のみを示す第１０図のＣ―Ｃ矢視断面図
、第７図は第６図のＤ―Ｄ矢視断面図、第８図Ａ
は両シフトレールの中立状態を示す作用説明図、
第８図Ｂは下側シフトレールの変速位置に移動す
る過程を示す作用説明図、第８図Ｃは下側シフト
レールの変速位置を示す作用説明図、第９図は中
心線よりも右側のみを示す前部ミツシヨンケース
の縦断正面図、第１０図は一部を破断状態で示す
前部ミツシヨンケースの側面図である。３……前部ミツシヨンケース、１０……変速ケ
ース、１１……変速レバー、１３……隔壁、１４
……上側シフトレール、１５……下側シフトレー
ル、１９……アダプタ、２０……アダプタ、２１
……ボス、２２……ボール、２３……溝、２４…
…筒部、２５……溝。 1 to 5 show a first embodiment of the present invention,
Figure 1A is a side view of the simultaneous engagement prevention mechanism showing the neutral state, Figure 1B is a sectional view taken along the line A-A in Figure 1A, and Figure 2A is a side view of the simultaneous engagement prevention mechanism showing the gear shifting state. Figure 2B is a sectional view taken along the line B-B in Figure 2A, Figure 3 is a longitudinal side view of the front transmission case showing only the main parts, and Figure 4 is the front part showing only the main parts. FIG. 5 is a longitudinal cross-sectional rear view of the transmission case and a schematic side view of the agricultural tractor. 6 to 10 show a second embodiment of the present invention, FIG. 6 is a sectional view taken along the line C--C in FIG. 10 showing only the right side of the center line, and FIG. D-D arrow sectional view, Figure 8A
is an action diagram showing the neutral state of both shift rails,
Figure 8B is an explanatory view of the action showing the process of moving the lower shift rail to the gear shifting position, Figure 8C is an explanatory diagram of the action showing the shifting position of the lower shift rail, and Figure 9 is only to the right of the center line. FIG. 10 is a side view of the front transmission case partially cut away. 3...Front transmission case, 10...Shift case, 11...Shift lever, 13...Bulkhead, 14
...Upper shift rail, 15...Lower shift rail, 19...Adapter, 20...Adapter, 21
...Boss, 22...Ball, 23...Groove, 24...
...Cylinder part, 25...Groove.

Claims

[Scope of utility model registration request]

In a transmission device in which a shift lever selectively operates a pair of shift rails between a neutral position and a shift position, one shift rail is supported on a boss fixed to the case, and a cylindrical portion that fits on the outer diameter of the boss is supported on the other. The ball, which is fixed to the shift rail and built into the boss mentioned above, is fitted into the groove of the shift rail and the groove of the cylindrical part at the neutral position of both shift rails. A transmission device with simultaneous mesh prevention configured to fit together.