JPH0749069A - Sealing device for engine adjusting bolt - Google Patents

Abstract

PURPOSE:To provide a sealing device for an engine adjusting bolt which is not easily modified by a simple daily tool. CONSTITUTION:An adjusting bolt B is inserted through a fixation part C of an engine, and fixed adjustably in reciprocating direction. A leading end 16 of the adjusting bolt B regulates a movable range of a movable member A. A fastening nut 18 is screwed on a base end 17 of the adjusting bolt B projected to the bolt operation side. The base end 17 and the fastening nut 18 is covered with a cylindrical cap 22. A cap escape-preventive means S is formed on the adjusting bolt B. The cylindrical cap 22 is fixed around the fastening nut 18 rotatably and unmovably in a direction of a bolt axis 25 of the adjusting bolt B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for adjusting bolts of an engine, more specifically, a speed adjusting bolt for limiting the swing range of a speed adjusting lever, a high idle spring adjusting bolt, a fuel limiting bolt for a diesel engine, etc. The present invention relates to a device for maintaining an adjustment bolt for adjusting the output and performance of an engine in a predetermined adjustment state and preventing alteration of the adjustment state.

[0002]

BACKGROUND OF THE INVENTION In general, the output and performance of an engine are adjusted by adjusting bolts such as a speed adjusting bolt, a high idle spring adjusting bolt, and a fuel limiting bolt, and then shipped from a manufacturer. For example, in the case of a diesel engine, due to its characteristics, the output of the engine is adjusted by limiting the maximum injection amount of the fuel injection pump in the presence of excess air. However, in a diesel engine equipped with a mechanical governor device, it is shown in FIG. As described above, there is one in which the fuel limiting bolt (15) is provided as the adjusting bolt (B) and the limitation of the maximum injection amount is adjusted by the fuel limiting bolt (15).

That is, a fuel limiting bolt (15) is fixed to the fixed portion (C) of the engine (E) so as to be adjustable forward and backward, and the inner tip portion (16) of the fuel limiting bolt (15) is fixed. Is positioned so as to be able to contact the governor lever (5b) which is the movable member (A) of the governor device (G), and the governor lever (5b) is configured to be incapable of swinging from the predetermined position to the fuel increase side. The maximum injection amount is limited by limiting the movable range of the control rack of the fuel injection pump (1) via the rack pin (6).

The maximum injection amount of this fuel injection pump (1) is
It affects not only the output of the diesel engine but also the emission amount of air pollutants contained in the exhaust gas such as NO _x and particulates. Therefore, the fuel limit bolt (1
The fixed position of the inner tip (16) of 5) is the diesel engine
It is an important factor in the performance of (E), and it is necessary to guarantee that it is maintained in a predetermined adjustment state.

Further, since the rotational position of the speed governing lever of the engine is directly related to the rotational speed and output of the engine, a predetermined engine performance can be obtained by adjusting the rotational range of the speed controlling lever. Is done. The high-speed side limit position and the low-speed side limit position of the turning range of the speed control lever are adjusted by speed adjustment bolts penetrating the fixed portion of the engine. It is necessary to guarantee that it is maintained in the adjusted state.

Therefore, the adjusting bolts such as the fuel limiting bolts and the speed adjusting bolts cannot be easily modified in their adjusted states, and if they are modified, the fact can be known. The operating end is sealed.

[0007]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a fuel adjusting bolt (1) protruding outward from a fixing portion (C) has been used as this sealing device.
5) the base end (17) of the adjusting bolt (B) and this base end (17)
The tightening nut (18) screwed to is covered with a tubular cap (51) made of thin metal such as lead or aluminum, and the intermediate portion (52) of the tubular cap (51) is caulked to reduce the diameter, Adjusting bolt
Some are configured to maintain the mounted state after adjustment of (B). The reference numeral (53) indicates a cap nut for preventing oil leakage from the screw groove.

[0008]

In the above-mentioned prior art, since it is necessary to caulk the intermediate portion (52) of the cylindrical cap (51) to reduce the diameter, it is formed thin with a relatively soft metal such as lead or aluminum. There is. For this reason, if the tubular cap (51) is forcibly removed from the fastening nut (18), it will be easy to find that it has been modified because scratches remain on the inner surface, but the tubular cap (51) removal operation itself It can be done with simple daily tools such as pliers.

Further, the tubular cap which is relatively easily deformed
Since the (51) can be deformed along the outer surface of the cap nut (53) and the fastening nut (18) by external pressure, the cap nut (53) and the fastening nut can be inserted through the deformed tubular cap (51). (1
8) can be rotated with daily tools and these nuts (18.5
The tubular cap (51) together with 3) can be removed from the adjusting bolt (B).

When the tubular cap (51) is removed, the adjustment bolt (B) can be moved back and forth with a simple daily tool.
The inner tip (1) of the adjusting bolt (B) adjusted to the specified state
The position of 6) may be easily modified.

Since such a modification affects the output and performance of the engine, and there is also a problem that it may fall outside the standard for measures against exhaust gas. Therefore, the adjustment state of each adjustment bolt can be easily changed with a simple daily tool. It must be sealed so that it cannot be done. SUMMARY OF THE INVENTION It is an object of the present invention to solve these problems and provide an engine adjusting bolt sealing device that cannot be easily modified by a simple daily tool.

[0012]

The present invention is characterized in that it has the following configuration in order to achieve the above object. That is, the cap removal prevention means (S) is attached to the adjustment bolt (B), the tubular cap (22) is rotatable around the fastening nut (18), and the adjustment bolt (B) is attached to the cap removal prevention means (S). It is fixed so that it cannot move in the direction of the bolt axis (25).

[0013]

The tubular cap (22) is fixed by the cap retaining means (S) attached to the adjusting bolt (B), so that it cannot be easily removed with a simple daily tool. Moreover, the tubular cap (2
Since 2) is rotatable around the fastening nut (18), the fastening nut (18) does not rotate and does not loosen even when the tubular cap (22) is rotated.

[0014]

Since the tubular cap cannot be easily removed from the cap retaining means by a simple daily tool, the fastening nut and the adjusting bolt covered by the tubular cap cannot be directly rotated. Moreover, since the fastening nut does not rotate and does not loosen even when the tubular cap is rotated, it is not possible to indirectly rotate the fastening nut from the outside through the tubular cap. As a result, since the tubular cap and the fastening nut cannot be removed from the adjustment bolt, the adjustment state of the adjustment bolt is not easily modified by a simple daily tool, and the predetermined adjustment state is maintained.

[0015]

1 and 2 show a first embodiment of the present invention. FIG. 1 is a front view of a governor device in which a fuel limiting bolt of a diesel engine is sealed by a sealing device, and FIG. It is a vertical cross-sectional front view of a sealing device.

Governor device for this diesel engine (E)
(G) is arranged in the pump housing (2) of the fuel injection pump (1) attached to the engine (E),
The governor weight (4) supported by the rotating shaft (3) of the above and the rack pin (6) of the control rack of the fuel injection pump (1) are interlockingly connected via the governor lever (5).

That is, this governor lever (5) comprises a main governor lever (5a) and a sub-governor lever (5b), and the tip of the main governor lever (5a) is attached to the rack pin (6) of the control rack.
And receives the governor force (F) generated by the rotation of the governor weight (4) at the other end of the main governor lever (5a), while the auxiliary governor lever (5b) and the speed control lever (7) are engaged. Install a governor spring (8) between the main governor lever and
A torque spring mechanism (9) is attached to (5a) to attach the torque pin.
The tip of (10) can be pressed against the sub governor lever (5b). As a result, the movement of the control rack is controlled by the unbalanced force between the governor force (F) generated by the rotation of the engine (E) and the spring force of the governor spring (8).

At the tip of the main governor lever (5a), a start spring is formed between the side wall (12) of the pump housing (2).
(11) is stretched, and by the spring force of the start spring (11), the rack pin (6) of the control rack can be moved to the increased starting position via the main governor lever (5a) at the time of engine start.

On the other hand, a fuel limiting bolt (15) as an adjusting bolt (B) is pierced through the upper wall (14) of the pump housing (2), which is the fixed portion (C) of the engine (E), so that it can be adjusted forward and backward. The inner tip portion (16) of the fuel limiting bolt (15) is made to face the sub governor lever (5b) which is the movable member (A). When the sub-governor lever (5b) swings toward the fuel amount increasing side, it comes into contact with the inner end portion (16) of the fuel limiting bolt (15) at a predetermined position. As a result, the sub-governor lever (5b) cannot move from this position to the fuel amount increasing side, and the maximum injection amount of the fuel injection pump (1) is limited.

The fuel limiting bolt (15) has a fastening nut (18) at a base end (17) which is a bolt operating side above the upper wall (14).
Is screwed on, and by tightening this fastening nut (18),
The fuel limit bolt (15) is fixed in the adjusted forward / backward position. The fastening nut (18) is sealed with a sealing device (20) together with the base end portion (17) of the fuel limiting bolt (15), and is configured to maintain the adjusted state of the fuel limiting bolt (15). is there.

As shown in FIG. 2, the fuel limiting bolt (1
In the sealing device (20) of 5), the bearing fixing part (21) is integrally formed on the base part (19) of the fastening nut (18), and the needle roller bearing (23) is fixed to this bearing fixing part (21). An iron cylindrical cap (22) is externally fitted and fixed to the needle roller bearing (23).
At this time, the needle roller bearing (23) is fixed to the bearing fixing portion (21), and the upper fastening nut (18) prevents the fuel limit bolt (15) from moving in the bolt axis (25) direction. It is impossible. In addition, the needle roller bearing (23) is
Larger outer diameter than 8).

On the other hand, the cylindrical cap (22) made of iron has an inner diameter slightly smaller than the outer diameter of the needle roller bearing (23), and the cylindrical cap (22) has a needle roller bearing (23). It is securely fitted and fixed by press-fitting. As a result,
The needle roller bearing (23) constitutes a cap retaining means (S), and the tubular cap (22) can rotate around the fastening nut (18) but cannot move in the bolt axis (25) direction. Fixed to.

In this embodiment, the cap retaining means is
Although the needle roller bearing (23) is used as (S), other types of roller bearings such as ball bearings may be used. Further, the bearing fixing portion (21) is integrally formed with the base portion (19) of the fastening nut (18), but it is formed separately from the fastening nut (18) to form the fastening nut (18).
Of the rolling bearing (23) may be fixed by pressing the inner ring of the rolling bearing (23) with the fastening nut (18) without forming the bearing fixing portion. Further, the outer shape of the cylindrical cap (22) is not limited to the cylindrical shape, and may be formed in a polygonal cylindrical shape.

FIG. 3 is a vertical sectional front view of a fuel limiting bolt sealing device showing a second embodiment of the present invention. In this embodiment, a caulking portion (29) is provided at the center of the tip of the cap nut (28) attached above the fastening nut (18), while the closed end of the tubular cap (22) is provided. (30) has a circular opening in the center
(31) has been formed.

The caulking portion (29) is rotatably inserted into the opening (31), and the caulking portion (29) protruding outside from the tubular cap (22) is caulked to cover the opening (31). Transform into a state.
As a result, the cylindrical cap (22) is free to rotate around the caulking portion (29) and therefore can rotate about the fastening nut (18), but cannot move in the bolt axis (25) direction.

FIG. 4 is a vertical sectional front view of a sealing device for a fuel limiting bolt showing a third embodiment of the present invention.

In this embodiment, as in the first and second embodiments, the fastening nut (18) is screwed to the bolt base end portion (17) of the fuel limiting bolt (15) which is the adjusting bolt (B). . A retaining ring fixing portion (32) is provided on the base portion (19) of the fastening nut (18), and a fitting groove (33) is formed on the outer peripheral surface of the retaining ring fixing portion (32). ), The retaining ring (34) is externally fitted so as to reduce the diameter against the spring force.

[0028] A cylindrical cap (2) that is fitted onto the fastening nut (18).
2) is inserted to a position where it covers the fitting groove (33). At this time, since the retaining ring (34) has a reduced diameter and is entirely housed in the fitting groove (33), the tubular cap (22) can be smoothly fitted on the outside. On the inner peripheral surface of this cylindrical cap (22), an annular groove (3
7) is formed, and when the tubular cap (22) is fitted to the position where the annular groove (37) faces the fitting groove (33), the retaining ring (34) causes the spring force The retaining ring (34) has its inner edge portion engaged with the fitting groove (33) and its outer edge portion engaged with the annular groove (37) to form the cap retaining means (S). As a result, the tubular cap (22) idles around the fastening nut (18), but since the retaining ring (34) engages with both grooves (33, 37), it moves in the bolt axial center (25) direction. Can not.

In each of the first to third embodiments described above, the fuel limiting bolt (15) is penetrated through the upper wall (14) of the pump housing (2). It suffices if it is fixed by penetrating it to C), for example, it can be applied to the case where the fuel limiting bolt is fixed to the gear case (27) and the like, and the type and structure of the governor device are not limited.

FIGS. 5 and 6 show a fourth embodiment, and FIG. 5 is a front view of the speed adjusting operation portion with the adjusting bolt sealed.
FIG. 6 is an exploded perspective view in which a part of the adjusting bolt sealing device is cut away.

As shown in FIG. 5, in this speed adjusting operation portion, a speed control lever (7) and an engine stop lever (13) which are linked with a governor lever (not shown) are rotatable on a fixed plate (38). A rotation limiting arm (39/40) which is arranged on the lower side of both levers (7-13) and rotates integrally with each lever (7-13).
Are provided respectively. On the other hand, the adjustment bolts are attached to the protrusions (43, 43, 43) which are the fixing portions (C) protruding from the fixing plate (38).
As (B), the high-speed limiting adjusting bolt (41), the low-speed limiting adjusting bolt (42), and the engine stopping adjusting bolt (44) are passed through and fixed so as to be adjustable forward and backward.

That is, the high speed limiting adjusting bolt (41) and the low speed limiting adjusting bolt (42) are attached to the rotation limiting arm for the speed adjusting lever.
Protrusions (43 ・ 43) of the fixing plate (38) facing the moving area of (39)
Fixed to the protrusions (43.4) of both adjustment bolts (41.42).
The amount of protrusion from 3) limits the rotation range of the speed control lever (7) via the rotation limiting arm (39) which is the movable member (A). Similarly, the engine stop adjusting bolt (44) is fixed to the protrusion (43) of the fixing plate (38) so that it faces the movement area of the rotation limiting arm (40) for the engine stop lever (13). The rotation position of the engine stop lever (13) toward the engine stop side is adjusted by the protrusion amount of the engine stop adjustment bolt (44) via the rotation limiting arm (40) that is the movable member (A). It is configured to be possible.

Each adjusting bolt (B) has a base end on the bolt operating side and a fastening nut (18) sealed by a sealing device (20). That is, as shown in FIG. 6, a retaining ring fixing portion (32) is integrally provided on a base portion (19) of a fastening nut (18), and a fitting groove (33) is formed on an outer peripheral surface of the retaining ring fixing portion (32). Forming this mating groove
The retaining ring (34) is externally fitted to (33) so as to reduce the diameter against the spring force, and the tubular cap (22) is externally fitted on the outer side of the retaining ring (34) to the inner peripheral surface of the tubular cap (22). The formed annular groove (37) is replaced with the fitting groove (33)
Is facing.

Similar to the third embodiment, the retaining ring (34) has an inner edge portion engaged with the fitting groove (33) and an outer edge portion engaged with the annular groove (37) to form a cap retaining means (S). And this
The tubular cap (22) runs idle around the fastening nut (18), but the retaining ring (34) engages with both grooves (33, 37), so it cannot move in the bolt axis (25) direction. .

In the first to fourth embodiments described above, the fuel limiting bolt and the adjusting bolt of the speed adjusting operation portion have been described, but the present invention can be applied to other adjusting bolts, for example, a rapid adjustment to the reducing side of the fuel adjusting rack. Regarding the high idle spring that buffers the movement, it can be similarly applied to the high idle spring adjusting bolt that adjusts the spring force. Further, these adjusting bolts can be applied not only to diesel engines but also to speed adjusting bolts of gasoline engines.

[Brief description of drawings]

FIG. 1 is a front view of a governor device showing a first embodiment of the present invention, in which a fuel limiting bolt of a diesel engine is sealed by a sealing device.

FIG. 2 is a vertical cross-sectional front view of a fuel limiting bolt sealing device.

FIG. 3 is a view corresponding to FIG. 2, showing a second embodiment of the present invention.

FIG. 4 is a view, corresponding to FIG. 2, showing a third embodiment of the present invention.

FIG. 5 is a front view of the speed adjusting operation unit with the adjustment bolt sealed according to the fourth embodiment of the present invention.

FIG. 6 is a partially cutaway exploded perspective view of a sealing device for an adjusting bolt according to a fourth embodiment.

FIG. 7 is a view corresponding to FIG. 1, showing a conventional technique.

FIG. 8 is a partially cutaway perspective view of a sealing device for an adjusting bolt showing a conventional technique.

[Explanation of symbols]

16… Adjustment bolt tip, 17… Adjustment bolt base end, 18
… Tightening nuts, 22… Cylindrical caps, 23… (needle-shaped) rolling bearings, 25… Bolt shaft centers, 28… Cap nuts, 29… Crimping parts,
30 ... Closing end of tubular cap, 31 ... Opening part, 32 ... Retaining ring fixing part, 33 ... Fitting groove, 34 ... Retaining ring, 37 ... Annular groove, A ...
Movable member, B ... Adjusting bolt, C ... Engine fixed part, E
... Engine, S ... Cap removal means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Shinohara 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. (72) Inventor Kozo Yoshida 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. (72) ) Inventor Masahiro Nagahama 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory

Claims (4)

[Claims] 1. An adjusting bolt for a fixed portion (C) of an engine (E).
(B) is pierced and fixed so that it can be moved back and forth, and the tip (16) of this adjusting bolt (B) is configured to limit the movable range of the movable member (A). Adjustment bolt protruding toward the bolt operating side
By covering the base end portion (17) of (B) and the fastening nut (18) screwed on the base end portion (17) side with the tubular cap (22), the adjustment bolt (B) after adjustment is adjusted. In the sealing device for the adjusting bolt of the engine which is configured to be maintained in the attached state, the adjusting bolt (B) is provided with the cap retaining means (S), and the cap retaining means (S) is provided with the cylindrical cap (22). Fastening nut
(18) Rotatable around and the bolt shaft center of the adjusting bolt (B)
A sealing device for adjusting bolts of an engine, which is fixed so as not to move in the (25) direction. 2. A rolling bearing (23) is fixed around the bolt shaft center (25) between the fastening nut (18) and the fixing portion (C), and the cap retaining means (S) is fixed by the rolling bearing (23). ), And a cylindrical cap (22) is externally fitted and fixed to the rolling bearing (23). 3. A cap nut on the base end (17) of the adjusting bolt (B).
(28) and attach the crimp (2) to the end of the cap nut (28).
9) is projected, an opening (31) is formed at the closed end (30) of the tubular cap (22), and the caulked portion (29) is rotatably attached to the opening (31). After inserting, the caulking part (29) protruding outside from the tubular cap (22) is caulked to be deformed so as to cover the opening (31), and the cap retaining means (S) is deformed by the deformed caulking part (29). Claim 1 constructed
Sealing device for the adjusting bolt of the engine described in. 4. A retaining ring fixing portion (32) is provided around a bolt shaft center (25) closer to the bolt base end portion (17) than the fixing portion (C), and an outer peripheral surface of this retaining ring fixing portion (32). A fitting groove (33) is formed in the fitting groove (33), and the retaining ring (34) is externally fitted into the fitting groove (33) against the spring force so that the fitting ring (34) can be reduced in diameter. An annular groove (37) is formed on the inner peripheral surface of the cylindrical cap (22) that covers the groove (33) and faces the fitting groove (33), and the fitting groove (33) and the annular groove (37) are formed. ) And a retaining ring (34) engaged with the cap retaining means (S).