BG98935A - Device for shifting connecting lever of two-speed gears - Google Patents

Abstract

The device is used in a reducer of a hand-operated electric two-speed impact boring and reversive machine-tool. It improves the reliability of the single-direction switching at rest and in operation, having simplified design and reduced overall dimensions. The device includes a switching knob (1), the stem (2) of which rests in a housing (3). A pin (7), parallel to the knob (1) is eccentrically fitted in the stem (2), the free end of which is mounted in a groove of switching lever (10). The switching pin (7) is connected to an insert (6) with a free sliding axle (5) of the knob (1) to which one of the ends (16) of a spring (14) fitted in hole (4) is engaged. Its other end (13) is fixed to the axle or to the element (12) locking the spring. A body (21) under the spring and opposite tracks (22) which are machined for one-way turning of the knob are provided for fixing the two switching positions.

Description

TECHNICAL FIELD

The invention relates to a gearbox shifting gear of two-speed gears.

BACKGROUND OF THE INVENTION

A gear shifting lever for two-speed gearboxes is known, including a pin parallel to the axis of the shift knob, fixed fixedly and eccentrically to the front of a switch-knob bearing in the housing. The pin is mounted in an opening located in the flat part of the U-bar limited by its shoulders. The toggle switch is provided with elements that lock two end opposite positions of the switch to the direction of rotation of the switch. The disadvantage of the device is the low reliability of switching, due to the split control of interconnected parts, most of which are located in a rotary clutch. This causes the clutch to be enlarged and complex and detrimental to the switching process. [1]

There is a known solution for moving a gear shift lever, comprising a perpendicular to the axis of the changeover knob, a spring pin mounted in the dead hole of a housing in the housing of the changeover knob.

It is provided with elements securing two extreme opposite in the direction of rotation of the switch positions.

The disadvantage of the solution is the dependence of the engaged state on the spring element, which in the process of impact mode of the gear is influenced by the inertial forces of the parts, loading the U - lever, which in turn loads the spring pin. Consequently, at

overload may cause the transmission to be switched off during operation. [2] [1] Design drawing of IEP-Sofia.

[2] BG 95887

SUMMARY OF THE INVENTION

The invention relates to a gear shifting lever for two-speed gearboxes, provided that the motion control of the shifting lever element is concentrated in a switching knob when the parts are not impacted in impact mode of the gearbox operation.

The problem was solved by using a housing in the housing of a switch knob with a central deaf opening. An axle is fixed at the bottom of the opening, the axially and radially circumscribed insert of which is pivotally connected to the free end. Attached to the insert is a mounting in the corresponding opening of the toggle lever. A spring is mounted in the central blind opening of the knob, one end of which is suspended by the insert and the other by the axis or by the spring element. The switch knob is fixed in two one-way switching positions by means of a spring element mounted in a housing and opposite surfaces of the switch knob stem. The spring element and the surfaces of the stem are formed to rotate the switch knob in the opposite direction to the torsional force of the spring. In such a construction, the influence of inertial forces arising from overload in impact mode is avoided.

DESCRIPTION OF THE FIGURES Attached

The present invention is illustrated in the accompanying drawings, which are:

Figure 1 General view of a two-speed gearbox, viewed from the inverted side of a partial cross-section spindle, showing the position of a switch knob and a U-shaped lever.

FIG. 2 is a section AA from FIG.

Fig. 3 is a section B-B of FIG. 2 showing the position of the locking elements in the on state.

Fig. 4 Mounting of switch knob, rear view.

FIG. 5 is a section AA from FIG. 4.

6 is a view from FIG.

Fig. 7 is a section view B-5 of FIG.

EXAMPLE FOR THE IMPLEMENTATION OF THE INVENTION

According to the accompanying drawings, a gear shift lever of two-speed gears consists of a switch knob (1), the stem (2) of which is mounted in a housing (3), the switch knob being provided with an opening (4), in the bottom of which an axially fixed axle (5) is mounted. An axially limited insert (6) with an eccentrically located pin (7), a sector (8) and an opening (9) are mounted on the axis. The pin (7) is freely sliding into the opening of a switch lever (10), the sector (8) is rotatable within a predetermined angle, limited by a tooth (11) by a switch

Button, and one end (13) of a spring (14) placed in a cavity (15) between a toggle switch and an insert is hung in the opening (12). The other end (16) of the spring is locked in an opening (17). As shown in FIG. 2, FIG. 5 and FIG. 7, the locking elements in one of the two switching states consist of a spring (19), recesses (20) or (2) mounted in an opening (18) of the housing (3). 24) formed opposite to a switch knob and a spring ball (body) (21). The recesses (20) or (24) copy the shape of the shotgun, and in the opposite direction of rotation of the toggle switch are provided with runners (22) allowing the shotgun to emerge from the recesses and sink into the opening (18). The exemplary embodiment thus described according to the invention operates as follows:

In the lower position of the pin (7), as shown in FIG. 2, the U lever (10) is in the lower end position corresponding to one gear speed. When rotating a switch knob (1) opposite to the runways (22) from the stem (2), the ball (21) emerges from the corresponding recess (20) and • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · * 6 No. ······ · · ··· · Go up the runway until it disappears into the opening (18). The pin (7) rotates about the axis of the toggle knob and, as a result, the eccentricity moves the U-shaped lever (10) upwards along the guide axis (23). As the rotary knob continues to rotate, the ball enters the opposite recess (24), regardless of whether the gears are engaged.

This is due to the agility of the spring (14), which tightens and softens the changeover. When the selector knob is rotated again in the required direction, the process is repeated, with the pin (7) from the up position moving down to move the U - lever to switch off and engage the previous gear.

SUMMARY OF THE INVENTION

The invention finds application in a reducer of a manual electric two-speed percussion and reversible drill.

Claims (1)

1. A gear shifting lever for bi-speed gears, comprising a housing mounted in a housing of a switch knob, fixed in two rotation positions, the eccentrically located parallel to the axis of the knob, the free end of which is mounted in a channel of the switch knob. lever, characterized in that the switching pin (7) is connected by a freely sliding insert (6) in the axis (5) in which one end (16) of a spring (14) placed in an opening (4) is engaged. , and the other end (13) is fixed to the axle, or to the locking pin Jinan element (12) by fixing both positions of the toggle spring loaded body (21) and opposed tracks (22) of the shaft are shaped for one-way rotation of the knob.