JP5456717B2 - Engine input control lever shaft sealing device - Google Patents

Description

  The present invention relates to a sealing device for an input operation lever shaft of an engine, and in particular, does not require high dimensional accuracy for molding of a packing, a boss or an input operation lever shaft, and the assembly work of the packing is simple, The present invention relates to a sealing device for an input operation lever shaft of an engine that can suppress a change in sliding resistance of the input operation lever shaft.

Conventionally, the input operation lever shaft is inserted into the boss, the input operation lever is attached to the outer end of the input operation lever shaft outside the engine, the output lever is attached to the inner end of the input operation lever shaft inside the engine, the boss and the input operation lever There is a sealing device for an input operation lever shaft of an engine in which an annular packing is interposed between the shafts (see, for example, Patent Document 1).
According to this type of sealing device, there is an advantage that oil inside the engine can be prevented from leaking to the outside of the engine through a gap between the boss and the input operation lever shaft.
However, this type of sealing device has a problem because a lip packing or an O-ring is usually used for the packing.
The lip packing has a lip part inside the attachment part, press-fits the attachment part into the packing attachment groove of the boss, presses the lip part against the input operation lever shaft, and seals with the elastic restoring force of the lip part. is there.
The O-ring is a type of squeeze packing that is elastically deformed as a whole. The O-ring is fitted into the packing mounting groove of the boss, and is sandwiched between the boss and the input operation lever shaft to be elastically deformed. The peripheral portion and the outer peripheral portion are pressed against the boss and the input operation lever shaft to perform sealing.

Japanese Patent Laying-Open No. 2004-278486 (see FIG. 1)

<< Problem >> When lip packing is used, high dimensional accuracy is required for molding of the packing and boss.
Since the lip packing is mounted by press-fitting the mounting portion reinforced with a metal plate or the like into the packing mounting groove of the boss, high dimensional accuracy is required for forming the packing and the boss.

<Problem> When the lip packing is used, the assembly work of the packing becomes complicated.
The lip packing needs to be attached by pressing a mounting portion reinforced with a metal plate or the like into the packing mounting groove of the boss with its own tool, and the assembly work of the packing becomes complicated.

<< Problem >> When an O-ring is used, the sliding resistance of the input operation lever shaft is likely to change.
Since the O-ring has one portion of the outer peripheral arc portion of the O-shaped cross section in pressure contact with the boss and one portion of the inner circular arc portion is in pressure contact with the input operation lever shaft, it is easy to twist and the sliding resistance of the input operation lever shaft is low. Easy to change.

  It is an object of the present invention that high dimensional accuracy is not required for forming a packing, a boss, and an input operation lever shaft, the packing is easily assembled, and a change in sliding resistance of the input operation lever shaft is suppressed. Another object of the present invention is to provide a sealing device for an input operation lever shaft of an engine.

(Invention specific matter of invention of claim 1)
Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1A, the input operation lever shaft (2) is inserted into the boss (1), the input operation lever shaft (4) is attached to the outer end portion (3) of the input operation lever shaft outside the engine, An output lever (6) is attached to the inner end (5) of the input operation lever shaft inside the engine, and an annular packing (8) is interposed between the boss (1) and the input operation lever shaft (2). In the input operation lever shaft sealing device,
As illustrated in FIG. 1D, a rubber cylinder (9) baked on the input operation lever shaft (2) is used as the packing (8), and a protrusion (10) is provided on the outer periphery of the rubber cylinder (9). A sealing device for an input operation lever shaft of an engine, characterized in that it is provided around and the ridge (10) is brought into pressure contact with the boss (1).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> High dimensional accuracy is not required for molding of packing, boss and input operation lever shaft.
As illustrated in FIG. 1D, a rubber cylinder (9) baked on the input operation lever shaft (2) is used as the packing (8), and a protrusion (10) is provided on the outer periphery of the rubber cylinder (9). Since this ridge (10) is press-contacted to the boss (1), the allowable width of the packing (8) and its mounting location is wide, and the packing (8), boss (1) and input control lever High dimensional accuracy is not required for forming the shaft (2).

<Effect> Easy packing assembly work.
As illustrated in FIG. 1D, a rubber cylinder (9) baked on the input operation lever shaft (2) is used as the packing (8), and a protrusion (10) is provided on the outer periphery of the rubber cylinder (9). Since this ridge (10) was pressed against the boss (1), it was not necessary to press the packing (8) into the boss (1) or the input operation lever shaft (2) with a jig. ) Assembly work is simplified.

<Effect> The sliding resistance of the input control lever shaft is difficult to change.
As illustrated in FIG. 1D, a rubber cylinder (9) baked on the input operation lever shaft (2) is used as the packing (8), and a protrusion (10) is provided on the outer periphery of the rubber cylinder (9). Since this protrusion (10) is press-contacted to the boss (1), the packing (8) is not easily twisted and the sliding resistance of the input operation lever shaft (2) is not easily changed.

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The seal of the packing is high.
As illustrated in FIG. 1 (D), since a plurality of protrusions (10) are arranged in the axial direction of the rubber cylinder (9), a plurality of stages of sealing are performed with the protrusions (10), and the packing (8) High sealing performance.

(Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1 or claim 2.
<Effect> The seal of the packing is high.
As illustrated in FIG. 1D, a rubber flange (11) is led out from the outer end of the rubber tube (9), and the rubber flange (11) is connected to the boss outer end surface (19) and the input operation lever (4). Since the ridges (10) and the rubber flanges (11) are used for sealing in a plurality of stages, the sealability of the packing (8) is high.

FIG. 1A is a longitudinal sectional view, FIG. 1B is a plan view, and FIG. 1 is a view for explaining an input operation device provided with a sealing device for an input operation lever shaft of an engine according to an embodiment of the present invention. (C) is a bottom view, and FIG. 1 (D) is an enlarged view of a portion indicated by an arrow D in FIG. 1 (A). 2A and 2B are views for explaining a fuel metering unit of the engine including the input operation device of FIG. 1, in which FIG. 2A is a longitudinal sectional view, and FIG. 2B is a view in the direction of arrow B in FIG. .

  1 to 2 are diagrams illustrating an input operation device provided with a sealing device for an input operation lever shaft of an engine according to an embodiment of the present invention. In this embodiment, an input of a fuel metering unit of a diesel engine is illustrated. The operating device will be described.

  As shown in FIGS. 2 (A) and 2 (B), a gear case (28) is provided in the front portion of the pump housing chamber (27) of the engine, and the fuel injection pump (29) is housed in the pump housing chamber (27). A pair of input operation devices are attached to (28). One input operating device is a speed adjusting device (30), which interlocks the governor lever (33) via a governor spring (32) to set the engine speed. The other input operating device is the engine stop operating device (31), which moves the fuel metering rack (34) of the fuel injection pump (29) to the fuel injection position, and stops the engine.

The engine stop operation device (31) will be described.
As shown in FIGS. 2 (A) and 2 (B), the engine stop operating device (31) is attached to a lid (35) attached to the gear case (28).
As shown in FIG. 1A, the input operation lever shaft (2) is inserted into the boss (1), and the input operation lever (4) is attached to the outer end portion (3) of the input operation lever shaft outside the engine. Attach the output lever (6) to the inner end (5) of the input control lever shaft on the inner side, and use the annular packing (between the boss (1) and the input operation lever shaft (2) at the boss outer end portion (7). 8) is interposed.
As shown in FIGS. 2A and 2B, the boss (1) is formed on the lid (35) to be attached to the gear case (28), and the input operation lever shaft outer end portion (3 ) Is attached to the input operation lever (4) for stopping the engine, and the output lever (6) for stopping the engine is attached to the inner end (5) of the input operation lever shaft inside the gear case (28) which is inside the engine. The output lever (6) is urged by a torque spring (6a) in the direction opposite to the engine stop operation direction.

As shown in FIG. 1 (D), a rubber cylinder (9) baked on the input operation lever shaft (2) is used as the packing (8), and a protrusion (10) is wound around the outer periphery of the rubber cylinder (9). This ridge (10) is pressed against the boss (1).
The packing (8) is disposed within the boss outer end portion (7). The ridge (10) is provided along the circumferential direction of the rubber tube (9).

As shown in FIG. 1D, a plurality of protrusions (10) are arranged in the axial length direction of the rubber tube (9).
A rubber flange (11) is led out from the outer end of the rubber cylinder (9), and the rubber flange (11) is sandwiched between the boss outer end surface (19) and the input operation lever (4).

The speed control device (30) shown in FIGS. 2 (A) and 2 (B) is also attached to a lid (36) attached to the gear case (28), like the engine stop operation device (31).
The boss (37) is formed on a lid (36) to be attached to the gear case (28), and an input operation lever for speed control (38) is provided at the outer end (38) of the input operation lever shaft outside the gear case (28) which is the outside of the engine. 39) is attached, and an output lever (41) for speed control is attached to the inner end (40) of the input operation lever shaft inside the gear case (28) which is the inside of the engine. The output lever (41) is urged by a torque spring (42) in the direction opposite to the engine stop operation direction.
The sealing structure of the input operation lever shaft (43) of the speed control device (30) is different from that of the engine stop operation device (31), but is the same structure as that of the engine stop operation device (31). May be.

(1) Boss
(2) Input operation lever shaft
(3) Input control lever shaft outer end
(4) Input operation lever
(5) Inner end of input control lever shaft
(6) Output lever
(7) Boss outer edge side
(8) Packing
(9) Rubber cylinder
(10) ridge
(11) Rubber flange

Claims (3)

Insert the input operation lever shaft (2) into the boss (1), attach the input operation lever (4) to the outer end portion (3) of the input operation lever shaft outside the engine, 5) In the sealing device for the input operation lever shaft of the engine, the output lever (6) is attached to the boss (1) and the annular packing (8) is interposed between the boss (1) and the input operation lever shaft (2).
A rubber cylinder (9) baked on the input operation lever shaft (2) is used as the packing (8), and a protrusion (10) is provided around the outer periphery of the rubber cylinder (9). A sealing device for an input operation lever shaft of an engine, which is brought into pressure contact with a boss (1). In the sealing device of the input operation lever shaft of the engine according to claim 1,
A sealing device for an input operation lever shaft of an engine, wherein a plurality of lip portions (10) are arranged in the axial direction of a rubber cylinder (9). In the sealing device of the input operation lever shaft of the engine according to claim 1 or 2,
The rubber flange (11) is led out from the outer end of the rubber tube (9), and the rubber flange (11) is sandwiched between the boss outer end surface (19) and the input operation lever (4). The sealing device for the input operation lever shaft of the engine.

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