US2847986A

US2847986A - Accessory drive for internal combustion engine

Info

Publication number: US2847986A
Application number: US591902A
Authority: US
Inventors: Herbert H Haas
Original assignee: Continental Motors Corp
Current assignee: Continental Motors Corp
Priority date: 1956-06-18
Filing date: 1956-06-18
Publication date: 1958-08-19
Anticipated expiration: 1975-08-19

Description

Aug. 19, 1958 H. H. HAAS 2,847,986

ACCESSORY DRIVE FOR INTERNAL COMBUSTION ENGINE Filed June 18. 1956 5 Sheets-Sheet 1 INVENTOR.

H. H. HAAS Aug. 19, 1958 ACCESSORY DRIVE FOR INTERNAL COMBUSTION ENGINE 3 Sheets-Sheet 2 Filed June 18, 1956 INVENTOR. 799 68? 7?, 77245 ATTOR NEYS H. HJHAAS Aug. 19, 1958 ACCESSORY Dam-z FOR INTERNAL COMBUSTION, ENGINE Filed June, 18.1956

s Sheets-Sheet :s

ATTORNEYS United States Patent ACCESSORY DRIVE FOR INTERNAL COMBUSTION ENGINE Herbert H. Haas, Royal Oak, Mich., assignor, by mesne assignments, to Continental Motors Corporation, Muskegon, Micln, a corporation of Virginia Application June 18, 1956, Serial No. 591,902

9 Claims. (Cl. 123-495) This invention relates to an accessory driving means for internal combustion engines, and more particularly to a crankshaft driven compact accessory driving means constructed to accurately synchronize some accessories with the crankshaft while permitting relatively flexible synchronization of other accessories.

In internal combustion engines having accessories such as fuel injection pumps, which must be driven in accurate synchronization with respect to the crankshaft in order to obtain uniform and precise fuel metering characteristics, and having other accessories such as heavy cooling fans rotating at high speed with inherently large inertia forces, and necessitating highly flexible synchronization with respect to the crankshaft, the means for driving both types of accessories should be carefully utilized. In constructing such driving means, certain factors need to be taken into consideration, such as compactness of the engine as a whole, simplicity of the driving means construction, accessibility of parts, and facility of the general engine assembly.

An object of the present invention is to provide an improved means for driving diverse engine accessories by constructing a compact crankshaft driven drive means having both stiff and flexibly operated components.

Another object of the present invention is to facilitate general assembly of engine accessories by providing a compact multiple accessory drive shaft ,to which the various accessories may be readily individually coupled.

A further object of the invention is to simplify the accessory driving means construction by providing a compact multiple accessory drive shaft having a single connection to the engine crankshaft and adapted for connection to both stiflf and flexibly operated accessories,

Yet another object of the invention is to provide for more compact engine assembly by constructing an accessory driving means disposed exterior to the engine crankcase and comprising a plurality of shafts concentrically rotatable about a common axis.

A still further object of the invention is to provide an engine with fuel injection pumps accurately synchronized to the operation of the engine crankshaft through an intermediate driving means also adapted to operate high inertia cooling fans by constructing an accessory driving means having a single crankshaft connection and comprising a relatively rigid shaft for driving the pumps as wellas a relatively flexible shaft for driving the fans, the shafts being secured together for simultaneous and uniform operation.

For a more complete understanding of my invention, reference may be had to the accompanying drawings illustrating a preferred embodiment of the invention in which like characters refer to like parts throughout the several views and in which Fig. 1 is an elevational end view, partly cut away, of a preferred V-type internal combustion engine incorporating the present invention.

Fig. 2 is a diagrammatic cross section primarily of ice the accessory portion of the engine taken substantially on the line 2--2 of Fig. 1.

Fig. 3 is an enlarged fragmentary portion of the accessory driving means shown in Fig. 2.

Fig. 4 is a fragmentary top view, partly in section, of the accessory driving means shown in Fig. 2, and

Fig. 5 is a sectional view taken substantially on the line 55 of Fig. 2.

In Fig. l, a flywheel end view of a preferred V-type internal combustion engine is illustrated as having a crankcase 11 provided with a substantially flat top surface 11a and inclined side surfaces 11b to which engine cylinders 12 are secured. The flywheel end of the crankshaft 13, as shown in Fig. 2, is provided with a driving means such as gear 14.

Various accessories, such as fuel injection pumps 15 and fan assemblies 15a, are mounted on the upper surface 11a of the crankcase, and are adapted to be operated by an accessory drive shaft assembly 16, which is preferably supported by bearing assemblies 17a and 17b secured in an accessory housing structure 18 which in turn is mounted on the crankcase 11. One end of the accessory drive shaft assembly 16 is provided with a driven gear 19 which extends through a slot 20 in the crankcase 11 to mesh with the crankshaft gear 14.

The fuel injection pumps 15 must be driven in precise synchronization with the crankshaft 13, but due to the high torque of the cooling fans 15a, these latter require more flexibility of drive. The compact accessory drive shaft assembly 16 is adapted for such diverse operations as is illustrated in more detail in Fig. 3.

The driven gear 19 is splined as at 25 or otherwise secured to a hollow shaft 26 of stiff or rigid construction which is rotatably supported by bearings 17a. An inner shaft or torsion bar 27 of relatively flexible construction, is preferably splined within the hollow shaft 26 as at 28, and is otherwise supported Where desired by bearings 17b. The hollow' shaft 26 is provided with an accessory drive gear 30 preferably engaged with a pair of fuel injection pump driven gears 31, which operate the fuel injection pumps 15 preferably through pump shafts 32 and couplers 33.

The inner shaft 27 is preferably enclosed in a housing '35 except within the accessory housing structure 18 where it is provided with an accessory drive gear 36 preferably engaged with a fan driven gear 37, which drives the fan 15a through a shaft 38 supported in a tower housing assembly 39.

As may be seen in Figs. 4 and 5, the pump drive shafts 32 are arranged -to extend past either side of the fan drive shaft 38, to provide a convenient placement of the pumps 15 between the two fan tower housing assemblies 39. The fuel injection pumps 15 are thus disposed conveniently for supplying fuel to fuel injection nozzles 15b through pipes or conduits 150, as indicated in Fig. 1. The torsion bar 27 may also be continued as far as desired beyond the accessories shown to operate additional equipment.

Although I have described but one embodiment of my invention, it will be apparent to one skilled in the art to which the invention pertains that various changes and modifications may be made therein without departing from the spirit of the invention or the scope of the aping a substantially rigid driving second element for driv-- ing some of said accessories, and a relatively flexible driving element operable for driving other of said accessories and secured to said rigid element in direct driving relation, said second driving element being relatively flexible with respect to said rigid element.

2. In an internal combustion engine having a plurality of accessories each provided with driven means, a crankshaft, and a driving means operably connecting said driven means with said crankshaft, said driving means comprising a substantially rigid driving element operable for driving some of said accessories, and a second driving element operable for driving other of said accessories and secured to said rigid element, said rigid element in direct driving relation, said second driving element being relatively flexible with respect to said rigid element comprising a rotatable hollow shaft operably connected at one end to said crankshaft, said second driving element comprising a shaft disposed concentrically within said hollow shaft and connected thereto only at the crankshaft end thereof.

3. In an internal combustion engine having a plurality of accessories each provided with driven means, a crankshaft, and a driving means operably connecting said driven means with said crankshaft, said driving means comprising a substantially rigid hollow shaft rotatably supported by said engine, one end of said shaft operably connected to said crankshaft, the other end of said shaft operably connected to some of said accessory driven means and providing substantially accurate synchronization of said accessories with respect to said crankshaft, and a second rotatable shaft secured to the crankshaft end of said rigid shaft, disposed concentrically within said hollow shaft, both of said shafts being rotatable together about acommon axis, said second shaft being relatively flexible with respect to said rigid shaft and operably connected with other of said accessory driven means to provide relatively flexible synchronization thereof with respect to said crankshaft.

4. In an internal combustion engine having a plurality of accessories each provided with driven means, a crankshaft, and a driving means operably connecting said driven means with said crankshaft, said driving means comprising a substantially rigid hollow shaft operable for driving some of said accessories, and a second driving shaft operable for driving other of said accessories and directly secured to said hollow shaft, said rigid hollow shaft being of shorter length than said second shaft and concentrically disposed with respect thereto in direct driving relation, said second driving element being relatively flexible with respect to said rigid shaft.

5. In an internal combustion engine having a plurality of accessories each provided with driven means, a crankshaft, and a driving means operably connecting said driven means with said crankshaft, said driving means comprising a substantially rigid hollow tubular shaft rotatably supported by said engine, one end of said shaft operably connected to said crankshaft, the other end of said shaft operably connected to some of said accessory driven means and providing substantially accurate synchronization of said accessories with respect to said crankshaft, and a second rotatable shaft having one end thereof secured to the crankshaft end of said first shaft, said second shaft extending through and projecting from said first shaft and concentrically disposed with respect thereto, said second shaft being relatively flexible with respect to said rigid shaft and operably connected with other of said driven means with said crankshaft, said driving means comprising a substantially rigid hollow shaft rotatably supported by said engine, one end of said shaft operably connected to said crankshaft, the other end of said shaft operably connected to some of said accessory driven means and providing substantially accurate synchronization of said accessories with respect to said crankshaft, and a second rotatable shaft secured to the crankshaft end of said rigid shaft, both of said shafts being rotatable together about a common axis, said second shaft being relatively flexible with respect to said rigid hollow shaft and operably connected with other of said accessory driven means to provide relatively flexible synchronization thereof with respect to said crankshaft, the common axis of said shafts being disposed parallel to the axis of rotation of said crankshaft.

7. In a fuel injection type internal combustion engine having a fuel injection pump, an engine cooling fan, and a crankshaft, said pump and said fan each provided with a driven means, and a driving means operably connecting said driven means with said crankshaft, said driving means comprising a hollow substantially rigid shaft rotatably supported by said engine, one end of said shaft operably connected to said crankshaft, the other end of said shaft operably connected to said pump driven means and providing substantially accurate synchronization of said pump with respect to said crankshaft, and a second shaft concentrically disposed in said first shaft and secured only at the crankshaft end thereof, the other end projecting from the pump operating end of said first shaft and operably connected to said fan driven means, said second shaft being relatively flexible with respect to said first shaft to provide relatively flexible synchronization of said fan with respect to said crankshaft.

8. In an internal combustion engine having a plurality of accessories each provided with driven means, a crankshaft, and a driving means operably connecting said driven means with said crankshaft, said driving means comprising two driving elements directly secured and operating in unison, one of said elements being relatively flexible with respect to the other of said elements, said elements respectively drivingly connected to separate driven means.

9. 'In an internal combustion engine having a plurality of accessories each provided with driven means, a crankshaft, and a driving means operably connecting said driven means with said crankshaft, said driving means comprising two driving elements directly secured and operating in unison, one of said elements being relatively flexible with respect to the other of said elements, said elements respectively drivingly connected to separate driven means, said driving elements each comprising a driving shaft, one of said shafts being concentrically disposed with respect to the other of said shafts.

References Cited in the file of this patent UNITED STATES PATENTS 1,874,681 Woolson Aug. 30, 1932