JPS601277Y2 - Internal combustion engine hydraulic oil pump mounting device - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a device for detachably attaching a hydraulic oil pump driven by an internal combustion engine to an internal combustion engine.

(Prior Art) It is necessary to install a hydraulic oil pump that generates pressure oil to operate the working equipment on an internal combustion engine installed in a vehicle equipped with hydraulically operated working equipment. Since pumps are required to have capacities of various sizes depending on the size and output of the working machine, there is a need for a means to easily attach and drive the pumps to a general-purpose engine.

Therefore, in a conventional internal combustion engine, a hydraulic oil pump 2 is removably attached to the outer surface of a gear case 1 of the internal combustion engine using a port 3, and is supported on both sides within the gear case 1 by bearings 4 and 4'. The driven shaft 5 is made into a hollow body, and a spline 6 is carved on the inner surface thereof, and a spline 8 formed on the outer periphery of the driven shaft 7 protruding from the hydraulic oil pump 2 is fitted into the spline 6 of the drive shaft 5. At the same time, by meshing the gear 9 attached to the outer periphery of the drive shaft 5 with the gear train 10 that drives the output shaft of the internal combustion engine via the gear train, the hydraulic oil pump 2 can be attached or detached as necessary. A configuration was adopted to obtain the results.

(Jitto Publication No. 41-1796, Publication No. 53-6340)
However, in such conventional hydraulic oil pump mounting devices, a spline joint is used between the drive shaft 5 and the driven shaft 7, and while the transmission force at this portion is large, ,
The spline peaks and grooves are in full contact, resulting in poor heat dissipation.
In addition, since the drive shaft 5 is supported on both sides by the bearings 4 and 4', lubricating oil droplets filled in the gear case 1 cannot be guided to the spline parts 6 and 8, so torque fluctuations occur during driving. Therefore, the frictional heat generated between the fitting parts causes seizure in this part, making it difficult to attach and detach the hydraulic oil pump 2.

Further, for the same reason, the temperature difference between the drive shaft and the driven shaft becomes large, and in extreme cases, the spline portion is deformed and damaged due to the force caused by the difference in expansion between the two.

Also, since there is full contact, if part of the mated side is damaged,
Additional force is applied to other parts, promoting damage to the entire unit, and even if only one part is damaged, all parts may need to be replaced.

Note that instead of using a spline joint, it is possible to connect the driven shaft 7 to the drive shaft 5 through a key, but if a key is used in this part, the contact pressure between the key and the shaft will be high. This causes fatigue and frictional heat on the contact surface due to torque fluctuations, and seizing occurs at the fitting part because the lubricant droplets in the gear case cannot be supplied to the contact surface, making it impossible to remove the hydraulic oil pump 2. .

(Purpose of the invention) In the Hontsuma type, the conventional internal combustion engine hydraulic oil pump mounting device had a problem in the installation and removal of the hydraulic oil pump due to seizure between the internal combustion engine side drive shaft and the hydraulic oil pump side driven shaft. Focusing on the problem, we made the acid m = joint portions of the driving shaft and driven shaft each prismatic with a regular polygonal cross section, and when they were combined, there was a space at every other corner of the female side fitting portion. □The space is communicated with the inside of the gear case in which the drive shaft is electrodynamically driven, so that the lubricating oil droplets filled in the gear case can be supplied to the male string fitting part, and the fitting The purpose is to promote the dissipation of the frictional heat generated at the joints, prevent seizure, and solve the problem of sagging.

(Togakari for inventing) The structure of the present invention, which is a distant relative of the above-mentioned objective, is that the drive shaft supported inside the gear case of an internal combustion engine is formed into a hollow body, and the female side is fitted into the inner surface of the center hole of the drive shaft. At the same time, a male side fitting part is formed on the outer periphery of the driven shaft protruding from the hydraulic oil system attached to the internal combustion engine, and the male and female fitting parts of both wheels are fitted together to achieve the above operation. In a hydraulic oil pump mounting device for an internal combustion engine, in which a driven shaft on the oil pump side is removably connected to a drive shaft of an internal combustion engine, the drive shaft is supported on a cantilever, and the center hole is located inside the gear case. While opening the
The outer periphery of the male side fitting part of the driven shaft has a prismatic shape with a regular polygonal cross section, and the female side fitting part has a polygonal cross section with a recess twice as large as the chevron-shaped convex part of the male side fitting part. Along with the square hole surface,
The recessed space of the female side fitting portion that remains in the axial direction when the image surface fitting portions are engaged is communicated with the space inside the gear case through the center hole inside the drive shaft.

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

FIG. 2 is a partial sectional view of an internal combustion engine to which the hydraulic oil pump mounting device of the present invention is applied, and FIG.
It is an A sectional view.

In FIGS. 2 and 3, 11 is a cylinder block of an internal combustion engine, 12 is a gear case attached to the cylinder block recess 11, and 13 is fitted into the mounting hole 14 of the cylinder block 11 from the side opposite to the gear case 12. A pump mount 15 is a hydraulic oil pump fixed together with the pump mount 13 by a bolt 16 implanted in the cylinder block 11 and a nut 17 screwed onto the bolt 16. can be easily attached and detached by removing the nut 17.

Further, the hydraulic oil pump 15 has a driven shaft 18 that protrudes toward the gear case 12 from the mounting surface with the bomb mount 13, and a male side fitting portion is provided on the outer periphery of the driven shaft 18. A driven collar 19 constituting the main body is fitted and fixed by a key 20 and a nut 21.

The driven collar 19 has a hollow hexagonal column whose cross section is a regular hexagon symmetrical with respect to the center line 22, and has six chevron-shaped protrusions 24, 24, .
・I have to appease myself.

On the other hand, reference numeral 25 denotes a drive shaft rotatably supported by two bearings 26 and 26' fitted on the inner circumference of the pump mount 13. A 16-hole hole 2 with one end open inside the gear case 12
7 is provided through the center hole 27, and a polygonal female side fitting portion 28 is formed at the inner periphery of the other end of the center hole 27.

As shown in FIG. 3, the cross-sectional shape of the female side fitting portion 28 is a type of star in which a hexagon that is the same as the cross-sectional shape of the driven collar 19 and a regular hexagon obtained by rotating this by 30° are superimposed. It has a square hole surface with a polygonal cross section, and has 12 equally pitched V-shaped recesses 29, 29... on the inner circumference,
The figures are symmetrical with respect to the center line 22 and 30, respectively.

Therefore, the driven collar 19 is connected to the female side fitting portion 2 of the drive shaft 25.
8, every other V-shaped recess 2
9, 29... are the six chevron-shaped protrusions 2 of the driven collar 19.
4, 24... are inserted, and the chevron-shaped protrusions 24, 24...
The V-shaped recess of the female side fitting part 28 that is not fitted into the space 3
1, and the space 31 communicates with the inside of the gear case 12 through the center hole 27 of the drive shaft 25.

The reference numeral 32 denotes a drive gear fixed to the outer periphery of the drive shaft 25 that has entered the inside of the gear case 12 by means such as bottom of a pit, and the drive gear 32 has an engine output similar to that of a conventionally known internal combustion engine. It meshes with a gear train interlocking with the shaft, and drives the driven shaft 18 of the hydraulic oil pump 15 via the drive shaft 25 and the driven collar 19.

The hydraulic oil pump mounting device of the present invention has the above-mentioned configuration. Next, its operation will be explained. First, during engine operation, the drive shaft 2 together with the drive gear 32
5 rotates, the V-shaped recess 2 of the female side fitting part 28 of this
A driven collar 19 having a chevron-shaped protrusion 24 on its outer periphery that fits into the driven collar 19 rotates as a unit.The driven shaft 18 to which the driven collar 19 is fixed is driven, and the hydraulic oil pump 15 is activated to supply pressure oil to the working machine. do.

At this time, at the fitting portion between the female side fitting portion 28 of the drive shaft 25 and the driven collar 19, force is dispersed to a plurality of concave and convex fitting portions, and a large transmission force is obtained, and the lubrication inside the gear case 12 is Oil droplets enter the space 31 between the male and female mating parts through the center hole 27, where they promote heat dissipation in the mating parts to prevent seizure due to frictional heat, and then pass through the bearings 26 and 26' and return to the gear case. Reflux into 12.

Therefore, if it is necessary to replace the hydraulic oil pump 15 with another one of a different capacity, simply remove the nut 17 and pull out the driven shaft 18 together with the driven collar 19 from the female fitting part 28 of the drive shaft 25. , can be easily removed.

Note that the rotation between the driven shaft 18 and the driven collar 19 is prevented by a key 20 instead of being fitted on the female side as in the present invention, so there is a risk of seizure. Even if seizing occurs in some parts, since seizing between the driven collar 19 and the drive shaft 25 is prevented, the hydraulic oil pump 15 can be attached and removed separately.

(Effects of the invention) As described above, the present invention has a hollow drive shaft supported inside the gear case of an internal combustion engine and a driven shaft of a hydraulic oil pump attached to the internal combustion engine, which are removably mated to each other. In the hydraulic oil pump mounting device for an internal combustion engine, when the fitting portions of the driving shaft and the driven shaft are fitted together at the regular polygonal prism shape and the waist, the corner portion of the female side fitting portion The space remaining in the axial direction' for every other gear is communicated with the inside of the gear case in which the drive shaft is supported through the center hole of the drive shaft, and the lubricating oil droplets filling the gear case are directed to the female side fitting part. Since it is designed to facilitate the dissipation of the frictional heat generated at the fitting part, even if frictional heat is generated due to engine torque fluctuations, the joint part will not seize or be damaged due to thermal stress. This can be prevented, and even if the V-shaped recess of the female side fitting part wears out and looseness occurs between the male side fitting part and the male side fitting part, the relationship between the male side fitting part and the female side fitting part can be prevented. By simply changing the mating position relationship, the female side recess that previously formed a space can be used as a contact part, which has the effect of allowing it to be used again in a new condition and eliminating looseness. do.

Furthermore, according to the present invention, since the outer circumferential portion of the male side fitting portion is prismatic with a regular polygonal cross section, there is no fear that the male side convex portion will break like in conventional spline joints, and it is easy to machine. It also has practical effects, such as being extremely easy to process.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventionally known hydraulic oil pump mounting device, FIG. 2 is a partial sectional view showing an embodiment of the hydraulic oil pump mounting device of the present invention, and FIG. 3 is a line A--A in FIG. It is an A sectional view. 12... Gear case, 15... Hydraulic oil pump, 18... Driven shaft, 19... Male side fitting part (driven collar), 25... ...drive shaft,
27... Center hole, 28... Female side fitting portion, 29... Recessed portion, 31... Space.

Claims (1)

[Claims for Utility Model Registration] A drive shaft supported inside a gear case of an internal combustion engine is made into a hollow body, a female side fitting part is formed on the inner surface of a center hole of the drive shaft, and the drive shaft is attached to the internal combustion engine. A male side fitting part is formed on the outer periphery of the driven shaft protruding from the hydraulic oil pump, and by mating the male and female fitting parts of both shafts, the driven shaft on the hydraulic oil pump side is connected to the drive shaft of the internal combustion engine. In a hydraulic oil pump mounting device for an internal combustion engine that is removably connected, the drive shaft is supported on a cantilever, the center hole is opened outside the gear case 1, and the outer periphery of the male side fitting part of the driven shaft is opened. It has a prismatic shape with a regular polygonal cross section, and the female side fitting portion is formed in the shape of the chevron-shaped convex portion of the male side fitting portion. When the square hole surface of the polygonal cross section with double the recess is engaged with the Koshioka fitting part, the recess space of the female side fitting part that remains in the axial direction is passed through the center hole inside the drive shaft to the gear case. It communicated with the internal space. A hydraulic oil pump mounting device for an internal combustion engine, characterized in that: