US1498317A - Motor drive - Google Patents

Description

June 17, 1924.

. 1,498,317 C. P. BROCKWAY MOTOR DRIVE Filed Oct. 22 1.920 2 Sheets-Sheet 1 6 m Fzq. I.

INVENTOR. Carl P. brockwa r.

A TTORNEYS.

June 17, 1924. 1,498,317

C. P. BROCKWAY MOTOR DRIVE Filed 0C(.- 22 1920 2 Sheets-Sheet 2 Fig. Y

INVENTOR. Car-1 1 Brockwgy. BY I I ATTORNEYS.

Patented June 17, 1924.

UNITED STATES,

PATENT OFFICE.

CARL P. BROCKWAY, OF TOLEDO, OHIO, ASSIGNOR TO INDUSTRIAL RESEARCH COR- POR TION, OF TOLEDO, OHIO, A CORPORATION OF DELAWARE MOTOR DRIVE.

Application filed October 22, 1920. Serial No. 418,801.

T 0 all whom it may concern:

Be it known that l, CARL P. BROCKWAY, a citizen of the United States, residing at Toledo, in the county of Lucas and State of Ohio, have invented certain new and useful Improvements in Motor Drives, of which I declare the following to be a full, clear, and exact description.

This invention relates to improvements in the driving mechanism between a starting motor and an engine and has for its main object the provision of power transmission means between the motor and engine which exerts no lateral force on the motor shaft thereby reducing friction and avoiding bending of the motor shaft.

Another object is the provision of an intermediate wheel between a wheel geared to the motor and a wheel geared to the engine which intermediate wheel swings about the axis of the motor wheel as a center but is I supported by a stationary support.

Another object is the provision of means to mount the swinging intermediate wheel in a support which pivots 011 a stationary part of the motor itself.

Another object is to provide yieldable stop means which holds the drive wheel yieldably in engagement with the driven wheel.

Another object is to provide such yieldable stop means which does not appreciably oppose the movement to engage the drive wheel and the driven wheel.

Other objects and those relating to simplicity of construction and economies of manufacture will appear as I proceed with a detailed description of that particular embodiment of my invention which for the purposes of illustration I have shown in the accompanying drawings, in which Fi re I is an end elevation of the starter showing its relation to a flywheel of an en-' Figure II is a side elevation of the driving [end of the starter.

Figure III is a section on line 3-3 of Fi re I.

igure IV is a section on line 44 of Fi re I.

igure V is a view similar t9 Figure IV but showing a modification.

Similar reference characters refer to sinnlar parts throu hout the several views In Figures to V, 1 represents a gear wheel to be driven by the starting motor 2.

This gear 1 is preferably formed on the periphery of the flywheel of the engine but it may be any gear which is arranged to crank the engine when turned. The motor 2 is rigidly mounted on the engine frame 6 as diagrammatically shown in Figure III and has a .pinion 3 fixed to the motor shaft 5. A inion 4 intermeshes with the pinion 3 and is keyed to shaft 7 which is mounted to swing, about the axis of the motor shaft as a center, but is not suspended from the motor shaft itself. A plate 8 is rigidly fixed to the end of the motor 2 and has a project ing bracket 9 extending out around the pinion 3 and is provided with a pivot pin 10 aligned with the axis of the motor shaft. The shaft 7 has hearings in a swinging frame 11, one end of which is pivoted upon the pin 10 and the other end 18 is pivoted upon the outside of the motor bearing 12. (See Figure III.) The shaft. 7 has keyed thereto, as best shown in Figure III, an inertia wheel 13, which preferably has most of its weight at its periphery so as to have a large moment of inertia for its weight. Normally the pinion 4 is held in a position relative to the gear 1 as shown in Fi re I by the spring 16 which may be rigid y fastened to the plate 8 as shown. A notch in the end of spring 16 engages a projection 17 on the large bearing 18 of the bracket 11. Of course any other means may be employed for holding pinion 4 out of engagement with gear wheel 1, such as gravity or any spring means. Preferably such means should act to hold the ears out of engagement only during a 5111511 movement of gear 4 toward engagement and be strong enough to prevent any accidental engagement of the gears but not appreciably oppose the mo tion when it is desired to engage-the gears.

In the operation of the starter when the motor suddenly starts by closing the switch the pinion 3 accelerates pinion 4 against the inertia of the wheel 13. This inertia causes an appreciable force to be exerted to swing pinion 4 in a counter clockwise direction and engage the gear wheel 1. A stop is arranged to limit this swinging movement when the gears are in proper engagement. One form of such stop is shown in detail in Figure IV. A plunger 19 is pivoted to the bearing 18 by means of pin 20. The plunger 19 reciprocates in a small cylinder 21 which is ivoted to a stationary part of the motor. i cusheasy upward movement of the plunger.

However if desired a check valve may allow air to enter the cylinder on the upward movement of plunger 19 but prevent the escape of air on the downward movement. In the modification shown in Figure V a compression "spring 25 in the bottom of cylinder 21 will prevent any shock in engaging gears 4 and 1 and yet exert a force tending to disengage the gears only over such avshort distance that the gear teeth will not become entirely disengaged but will be yieldingly held together and will ride in and out as the engine passes over compression. This riding, to a greater and less depth of engagement is caused by the var ing torque of the motor on the gear 1. f course, the stop for this swinging movement may be formed in various other ways, the requirement being only that there be no appreciable opposition to the swinging movement during the first part of the movement and yielding opposition during the last part of the movement in order to avoid any shock'of engagement. When the engine starts the gear 1 over-runs the motor pinion 3 and causes the pinion 4 to immediately swing out of engagement with gear 1. The swinging parts have enough inertia to swing the frame 11 until projection 17 falls into the notch in spring 16. The inertia wheel 13 is now running at the full speed of the motor and therefore the motor pinion 3 cannot exert a sufficient force on pinion 4 to swing it back into engagement with gear 1. The motor switch is now opened and the motor stops with the pinion 4 in this position allready for the next starting operation.

Preferably the motor 2 is positioned so that the angle A between the line joining the centers. of pinion 3 and gear 1 and the line joining the centers of pinion 3 and pinion 4 is only about twenty degrees when pinion 4 is swung to its innermost position of engagement with gear 1. However, this angle A may be made equal to zero when it is desired that pinion 4 swing through a large are before becoming engaged or disengaged, or the angle A may be ,made 90 degrees when it is desired that it swing through only a very small arc.

The frame 11 is not suspended from the motor shaft since the pressure exerted by the frame 11 would materially increase the friction on the motor shaft 5 as well as to tend to bend the same. This frame 11 may be suspended in any suitable manner other than that shown so long as it swings about the axisof the motor shaft.

While I have described in more or less detail certain embodiments of my invention I do not Wish to be limited thereto as many modifications will be obvious to those skilled in the art and without departing from the scope of my invention.

Therefore, I desire to claim my invention broadly as well as specifically as shown by the appended claims.

What I claim is:

1. In a starter drive, in combination, an engine shaft, a wheel thereon, a motor having a shaft, a second wheel'mounted to swing about the axis of the motor shaft as a center but not supported by the motor shaft, said second wheel being actuated by the torque of the motor to engage the first wheel, and means to yieldingly limit the swinging movement of said second wheel and additional means for retarding the swinging movement of said wheel.

2. In a starter drive, in combination, an engine shaft, a wheel thereon, a motor having a shaft, a second wheel geared to the motor and mounted to swing about the axis of the motor shaft as a center but not supported by the motor shaft, said second wheel being actuated by the torque of the motor to en age the first wheel, and means to yieldingly limit the swinging movement of said second wheel and additional means for retarding the swinging movement of said wheel.

In testimony whereof I aflix my signature.

CARL P. BROCKWAY.

Images