CN1131455A

CN1131455A - Device for displacing switching lever in two-speed transmission system

Info

Publication number: CN1131455A
Application number: CN 95190709
Authority: CN
Inventors: 尼古拉·伊万诺夫·甘切夫
Original assignee: ELTOS
Current assignee: ELTOS
Priority date: 1994-07-29
Filing date: 1995-07-21
Publication date: 1996-09-18
Anticipated expiration: 2015-07-21
Also published as: DE19581048T1; WO1996004496A1; CN1044639C; BG98935A

Abstract

The proposed device for displacing a switching lever in a two-speed transmission system has a knob which can be fixed in two positions as the transmission rotates in the housing and comprises a shaft, a rod, an insert with a pin, segment and tooth, and a spring between the shaft and insert. The shaft has recesses for balls which fix the position of the knob. The freedom of the knob to rotate is defined by the segment and limited by the tooth. The pin displaces the lever when the knob rotates.

Description

The device of the cocking lever in the mobile two-speed transmission

The present invention relates to the device of the cocking lever in the mobile two-speed transmission.

The device of the cocking lever in a kind of mobile two-speed transmission of prior art comprises a pin, with the parallel axes of conversion knob, and is installed in the conversion knob prejudicially, is contained in the front portion of the rotating axle head in the shell.This pin is contained in the hole of flat end of U-shaped bar, and this flat end is limited by the shoulder of U-shaped bar.The conversion knob is provided with the device of stationary phase to the mutual relative two ends dislocation of the sense of rotation of knob.The shortcoming of this device is that the conversion reliability is low, because control relevant part respectively, most of functional units are rotating on the clutch.Make clutch designs heavy and complicated, and harmful to the transfer process play.

Comprise the pin of a spring-loaded and the axis normal of conversion knob from the technological scheme of the known a kind of mobile two-speed transmission cocking lever of Bulgarian patent BG95887, and be contained in knob, be contained in axle journal in the blind hole of the bar in the shell.This pin contacts with the internal surface of the U-shaped bar of bending around rotary knob rod.The conversion knob is provided with the element of stationary phase to the dislocation of the sense of rotation of knob.The shortcoming of this scheme is that dislocation is relevant with the spring-loaded element, and in the process of gearbox impact load, this loading element is contained in the inertia force influence of the part on the U-shaped bar, and the U-shaped bar is subjected to the load of spring loaded pin in its side.

Because the transmission of motion under the situation of overload, can take place to throw off in above-mentioned situation instantaneously.

Describe the present invention in detail below by accompanying drawing, in the accompanying drawing:

Fig. 1 is the view that the part of the two-speed transmission seen from the axle rear side is analysed and observe, and shows the position of conversion knob and U-shaped bar;

Fig. 2 is that Fig. 1 is along A-A line side cross sectional view;

Fig. 3 is along B-B line side cross sectional view among Fig. 2, and the fixedly position of the element of cutting into position is shown;

Fig. 4 is the assembly of the conversion knob seen from behind;

Fig. 5 is along A-A line side cross sectional view among Fig. 4;

Fig. 6 is the view of seeing to the direction of arrow along C among Fig. 5;

Fig. 7 is along B-B line side cross sectional view among Fig. 5.

As shown in the figure, the device that is used for moving the cocking lever of two fast gear-boxes comprises a conversion knob 1, and the bar 2 of this knob 1 is bearing in the shell 3 by roll neck, and described conversion knob is provided with a hole 4, is adorning an axial immovable axle 5 in the bottom in this hole 4.An articulated inserting member 6 that axially limits on axle, it has cam pin 7, sector unit 8 and hole 9.Pin 7 can freely be free to slide in the hole of speed change lever 10, and sector unit 8 turns certain angles, and is limited by the projection 11 of conversion knob 1, and an end 13 that is placed on the spring 14 in the blind hole 15 between conversion knob and the inserting member 6 colludes in hole 12.The other end 16 of spring 14 is fixed in the hole 17.As Fig. 2, shown in 5 and 7, fixedly one element comprises spring 19 in the hole 18 that is installed in shell 3 in two of speed change positions, be located on the bar of conversion knob mutual relative two

pits

20,24 and by the ball 21 of spring 19 loadings.The shape of two

pits

20,24 and ball 21 complementations are provided with track 22 in the direction relative with the sense of rotation of conversion knob, can make ball shift out pit and enter in the hole 18.

Operate as follows according to embodiments of the invention:

At the lower position (as shown in Figure 2) of pin 7, U-shaped bar 10 is in extreme lower position, and a speed in becoming with two speed of gear-box is corresponding.When rotating conversion knob 1 relative to the direction of the track 22 of bar 2, ball 21 shifts out corresponding pit 20, is stuck on the track to the last in the indentation hole 18.Pin 7 is around the rotational of conversion knob 1, because eccentric distance e makes U-shaped bar 10 along upwards conversion of the axis of guide 23.When further rotating the conversion knob, ball enters in the relative pit 24, and is irrelevant with the sprocket wheel whether they mesh.Because the elasticity of spring 14 makes to change to be subjected to torsion and to flatten steady.Along required direction repeated rotation conversion knob the time, said process repeats, and pin 7 is in the higher position from it and moves down, and makes the U-shaped bar throw off one position, back, and with last engagement position.

The present invention can be used for the reduction gear of portable two fast percussion drills and reversible electric drill.

Claims

1. device that the cocking lever that is used for making two fast gear-boxes moves, comprise a conversion knob, its bar by journal rest in shell, and can be fixed on two pivotal positions, on bar, be provided with prejudicially one with conversion knob parallel pin, the free end of described pin is installed in the groove of cocking lever, it is characterized in that described pin (7) can be connected with the inserting member (6) of going up the free activity of do at the axle (5) of changing knob (1), an end (16) that wherein is contained in the spring (14) in the hole (4) is fixed, the other end (13) of spring (14) is fixed in the element (12) of axle or fixing spring, be provided with the spring-loaded ball (21) that is used for fixing two dislocations, with the relative track (22) on bar, they allow the conversion knob to make one-way rotation.