JPS6040834Y2 - engine adjustment screw device - Google Patents

Description

[Detailed description of the invention] This invention is an engine adjustment screw device that is installed so that the operating part protrudes from the fixed wall of the engine, such as a high idling adjustment screw device, and which requires oil tightness. Regarding the adjustment screw device of the engine, it is possible to reduce the amount of protrusion of the adjustment screw device from the engine fixed wall while ensuring oil tightness of the threaded part of the adjustment screw on the engine fixed wall.
The purpose is to allow easy assembly and adjustment in narrow spaces.

Conventionally, like a high idling adjustment screw device, the tip of the adjustment screw faces the gear case filled with a mist atmosphere of lubricating oil, and the operating part at the rear end protrudes outside the engine, and is screwed into the fixed wall of the engine. In order to prevent lubricating oil from leaking from the threaded portion of the adjusting screw device provided together with the screw, as shown in FIG.

That is, the adjustment screw 41 screwed into the fixed wall 40 of the engine is prevented from rotating with a lock nut 43 via a gasket 42.
The lubricating oil exuding from the threaded portion 44 of the adjustment screw 41 is transferred to the gasket 4 between the lock nut 43 and the subsequent cap nut 45.
The receiver is stopped by a cap nut 45 which is screwed onto the adjustment screw 41 with a screw 6 interposed therebetween, thereby preventing lubricating oil from leaking to the outside.

However, in such a device, in addition to the adjustment screw 41, two
It requires a large number of parts, including two gaskets 42 and 46, a lock nut 43, and a cap nut 45, which is expensive, and it is time-consuming because each part must be unscrewed during operation.

In addition, when it is assembled to the fixed wall 40 of the engine, the cap nut 45 that catches leaked oil protrudes largely from the fixed wall 40, making it difficult to assemble or adjust the adjustment screw device in a crowded and narrow place in the engine. It was difficult to do so.

This invention was proposed to eliminate the above drawbacks.
An oil-tight circumferential surface is provided on the adjustment screw screwed into the fixed wall of the engine, and the lock nut that locks the adjustment screw presses the O-ring to form an oil-tight seating surface on the outer peripheral surface of the screw hole. and the oil-tight circumferential surface of the adjustment screw, respectively, to seal against external leakage of oil.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the peripheral structure of a governor device of a vertical diesel engine.

In this governor device G, a main governor lever 4 receives the governor force 3 of a centrifugal ball governor 2 installed in a cam gear 1 that is rotated by a crank gear (not shown), and a press pin 5 provided on the main governor lever 4 receives this governor force 3. The tension is transmitted to the sub-governor lever 6 via the auxiliary governor lever 6 and engaged with the tip of the main governor lever 4 by the difference between the tension of the governor spring 8 provided across the tip of the sub-governor lever 6 and the accelerator lever 7 and the governor force 3. The control rack 10 of the fuel injection pump 9 is controlled to control the amount of fuel supplied to the engine.

Reference numeral 11 denotes a high idling adjustment screw device, and as shown in FIG. 2, this adjustment screw device 11 has an adjustment end face 12, an adjustment screw portion 13, and notches at appropriate intervals in the longitudinal direction from the front end to the rear end. The oil-tight circumferential surface 14 formed by the oil-tight circumferential surface 14, the lock screw portion 16 into which the lock nut 15 fits, and the hexagonal bolt head-shaped rotation operation portion 17 are formed into an adjustment screw 18, and the lock screw portion 16 of the adjustment screw 18 has a tip. O-ring 19
While the lock nut 15 provided with the lock nut 15 is screwed together, the adjustment screw part 13 is screwed into the screw hole 21 provided in the gear case 20, which is a fixed wall of the engine E.

Then, after adjusting the amount of advancement of the adjustment end surface 12 at the tip by operating the rotation operation part 17 of the adjustment screw 18, the lock screw part 1
6 and fix the adjustment screw 18 to the fixed wall 20 of the engine E.

In this way, the O-ring 19 provided at the tip of the lock nut 15 connects to the outward-opening tapered push surface 22 at the tip of the lock nut 15 and the oil-tight seat surface 23 provided around the screw hole 21.
The inner surface 24 of the O-ring 19 strongly presses against the oil-tight circumferential surface 14 of the adjusting screw 18, thereby reliably sealing the leakage of lubricating oil.

The high idling adjustment screw device 11 assembled to the fixed wall 20 of the engine E in this way has an adjustment end surface 12 at its tip that stops the receiving surface 25 of the sub-governor lever 6, and when the main governor lever 4 is operated at high speed without load. suppresses excessive movement toward the increasing side.

3 and 4 show a locking structure for the adjustment screw 26 for low idling, which is attached to the front end wall 27 of the pump case 27, which is the fixed wall of the engine E.
A screw hole 29 is provided in the boss 28, which is shaped like an oval part of a, and the low idle ring adjustment screw 26 is screwed into this screw hole 29, and it is rotated by fitting into the serrations of the rotation operation part 30 at the tip. A hydraulic pump (not shown) is fixed to the front of a pump case 27 so that an outer cylinder 32 having a hole 31 on which an operating part 30 can slide non-rotatably is fitted onto a camshaft 33 and driven. ) and the front wall 27a of the pump case 27 via O-rings 35 and 35, respectively.

The outer cylinder 32 thus provided is an outer cylinder 3 as shown in FIG.
A fixture 36 shaped to match the hexagonal outer peripheral surface 32a of No. 2
The hexagonal cylinder part 37 is fitted into the outer cylinder 32, and both ends 38a of the lower disc-shaped collar part 38 are bent along the oval boss 28 to prevent the low idle ring adjustment screw 26 from rotating. That's how it is.

Also, the one shown in Figure 6 is the low idle ring adjustment screw 2.
6 is shaped with a hexagonal bolt, and the fixing member 36 is directly fitted into the hexagonal rotation operating portion 39 to prevent the adjustment screw 26 from turning.

In this case, synthetic resin is applied to the threaded portion 26a of the adjustment screw 26 that is threaded into the threaded hole 28 provided in the fixed wall 27a to seal lubricating oil from the threaded portion.

As described above, the present invention is structured and operates, and has the following effects.

(b) A single O-ring can reliably seal oil from leaking from the threaded part of the adjustment screw screwed into the fixed wall of the engine, preventing oil from leaking outside. Therefore, there is no need to install a conventional cap nut, and the protrusion dimension from the solid wall of the engine to the rotary operation section can be reduced accordingly.

This makes it easy to assemble and adjust the adjustment screw even in complicated areas of the engine.

(b) Furthermore, since the O-ring can reliably prevent oil from leaking to the outside, inspection of the cap nut and gasket can be omitted, reducing the number of parts, simplifying the structure, and making it possible to implement the system at low cost.

(c) Moreover, since the O-ring is pressed by the tapered pressing surface of the lock nut, the O-ring is evenly pressed against the oil-tight bearing surface of the fixed wall and the oil-tight circumferential surface of the adjustment screw, and is lubricated. Oil leakage can be reliably sealed.

[Brief explanation of drawings]

Figure 1 is a longitudinal side view showing the peripheral structure of the governor device of a vertical diesel engine, Figure 2 is an enlarged view of the main parts, Figure 3 is an enlarged cross-sectional view of part ■ in Figure 1, and Figure 4 is Figure 3 IV. -IV line sectional view, FIG. 5 is a perspective view of the fixture, FIG. 6 is a view corresponding to FIG. 3 showing a modified example, and FIG. 7 is a view equivalent to FIG. 2 showing a conventional example. E...Engine, 12...Adjustment end surface,
13... Adjustment screw part, 14... Oil-tight circumferential surface, 15... Lock nut, 16...
・Tatsukushi screw part, 17...Rotation operation part, 18・
...adjustment screw, 19 ...0 ring, 20
...Fixed wall, 21...Screw hole, 22.
...Press surface, 23...Oil-tight bearing surface.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A screw hole 21 is made in the fixed wall 20 of the engine E, an adjustment screw 18 is screwed into the screw hole 21, and the adjustment screw 18 is configured to be fixed with a lock nut 15. 18 has an adjustment end surface 12, an adjustment screw section 13, an oil-tight circumferential surface 14 cut out at appropriate intervals in the longitudinal direction, a lock screw section 16, and a rotation operation section 17 in order from the tip to the rear end. Then, screw the adjustment screw part 13 into the screw hole 21, screw the lock nut 15 into the lock screw part 16, and form an oil-tight seat surface 23 on the circumferential surface of the outer end of the screw hole 21.7. A pressing surface 22 is formed in an outwardly opening tapered shape on the end surface of the lock nut 15 facing the surface 23, and the O-ring 19 is pressed by the pressing surface 22 to provide an oil-tight seal to the oil-tight seating surface 23 and the oil-tight circumferential surface 14. An engine adjustment screw device that is characterized by the ability to 2. Scope of Utility Model Registration In the engine adjustment screw device described in claim 1, the adjustment screw 18 is a high idling adjustment screw for a fuel injection pump. 3. Utility Model Registered Claim The engine adjustment screw device according to claim 1 or 2, in which the rotary operation portion 17 has a polygonal circumferential surface.