SU46162A1 - A device for the communication of the reciprocating movements of the spindles in the machines for grinding the valves - Google Patents

Description

Very often, the valves of the tractor engines are lapped manually. In the known lapping machines for several valves simultaneously, the spindles receive rotation and periodic axial reciprocating motion using a common camshaft.

According to the invention, a tool for grinding the valves is offered a device for communicating the return movement of the spindle; Two ratchet wheels working in different directions are stuck on the drive shaft of the machine. To communicate these ratchet wheels are dogs driven by individual cranks from the common crank.

In FIG. 1 is a front view of the machine; FIG. 2-side view; FIG. 3 shows it from above with a partial cut; FIG. 4-sectional mechanism for lifting spindles; FIG. 5 and b is a diagram of the mechanism for communicating the pinch of the reciprocating motion for the two positions of the crank.

The cylinder block of a tractor or the like internal combustion engine is mounted on brackets 2 of the frame 7 of the machine under spindles 3, close to the walls, so that

The valves are centered (Fig. 1). The machine receives rotation using a belt pulley 4, on one shaft with which gear 5 is mounted on the sliding key. This scraper 5, if desired, switches to gear with either the 6 pin, in the case of grinding the valves, or the 7 pin, in the case of milling (Fig. 2 and 3).

Gear b through the parasitic gear 8 indicates the rotation of the gear 9 of the same diameter from the last, mounted on the camshaft / 0. The other bar 7 is mounted on the shaft //, which bears the bevel gears J2, which are in engagement with the bevel gears of 13 spindles 3.

Each bevel gear J3 is mounted on a machine spindle with a key placed in a longitudinal keyway allowing longitudinal reciprocating movement of the spindle.

To clamp the valve during grinding, a strong spring J4 acts through the support washer J5 on the spindle head 3, the pressure of which is transmitted to a screwdriver / 6, which is inserted at one end of a square section into the spindle head, and abutting another in the valve recess.

A weak spring is placed under the valve in the cylinder of the block; it is designed only to lift the valve and screwdriver to a certain insignificant height. The support washer 15 has two pins, which are included in the corresponding lift of the lifting lever 17 (Fig. 4), so that this washer allows the spindle to rotate and, at the same time, raises the spindle, compressing the spring.

The lever 17 for lifting the washer 75 sits freely at one end on the eccentric 18, while the other rests on the cam of the shaft 7 /. This cam is a circle having a lift on some part of the circle. vertically terminating at the highest point.

At the moment of the highest position of the end of the lever 77 on the cam ledge, the spring M is compressed, and the lower sub valve spring slightly raises the valve to the screwdriver.

The next moment, the end of the lever 77 jumps off the cam. The spring / 4 is released and, overcoming the resistance of the weak spring, it pushes the valve against its seat in the cylinder block. Each lever 77 sits freely on its eccentric 75; in accordance with the number of valves, all eccentrics are provided with pens 79 and mounted on one fixed axis 20. By rotating the eccentric knob 79, you can raise or lower the axis of rotation of the lever 77 and thereby stop or increase the spring pressure M.

When the machine is in operation, gear 6 drives a revolving-rotary mechanism, which consists of mounted on a shaft connected by bevel gears 72, 75 with spindles 3, two ratchet wheels 27, 22 of different diameters. A smaller diameter ratchet wheel 22 serves to communicate a forward, and a larger diameter ratchet wheel 21 serves for reverse rotation. The teeth of the larger ratchet wheel 22 for reverse rotation are directed in the opposite direction to the teeth of the smaller wheel. The small-diameter ratchet pawl 23 is pivotally connected to the connecting rod 24 and supported on a pivoting arm 25 mounted on shaft 77. When the crank 26 is rotated in the forward direction, the pawl 23 turns the small ratchet wheel 22 in the same direction. the other ratchet wheel 27 acts on the elongated shoulder of the pawl 28, due to which the latter jumps out of engagement with the large ratchet 27 and thus does not interfere with the movement of the ratchet 22 of small diameter. When the crank 26 moves along the second part of the circle in the opposite direction, the pawl 23 slides along the teeth of the small ratchet 22, and the pawl 28 of the larger wheel 27 engages with its teeth, thus rotating the shaft / 7 in the opposite direction (FIG. 5 b). .

Such a device allows the shaft 77 of the bevel gears to communicate, and with them the spindle m 3, variable return movements, and the forward travel is greater than the return stroke due to the different diameters of the ratchet wheels 27, 22.

The subject matter of the invention.

A device for communicating reciprocating and rotational movement of the spindles in the machine for grinding the valves, characterized by applying to the shaft 77 for the spindles drive shaft two ratchet wheels 27 and 22 working in different directions, the dogs 23, 28 of which are driven by separate connecting rods 24 27 of the total crank 26. to the author's certificate of S. O.

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