RU2617245C2 - Rack and impulse variator with single-shaft eliminator - Google Patents

Abstract

FIELD: transportation.

SUBSTANCE: proposed rack pulse variator with single-shaft straightener mechanical vibrations, racks main motion (ZRGD) which are arranged in pairs and meet each other in the reciprocating slides. Reciprocating slides to the opposite direction ZRGD hooked each with a crank or eccentric with the formation of the Scottish mechanism.

EFFECT: downsizing.

2 cl, 2 dwg

Description

The invention relates to mechanical engineering and can be used in drives of machines and mechanisms, including the transmission of main power in vehicles, as an adjustable continuously variable transmission, in particular, in the automotive industry, motorcycle industry, in the production of agricultural, construction equipment, bicycles. Pulse variators (IVs) usually include the following functionally related mechanisms: a generator of mechanical vibrations (GMC), a means of regulating the amplitude of a GMC, and a rectifier of mechanical vibrations (rectifier) with free-wheeling mechanisms (MCA). Rack and pinion (containing kinematic pairs of gear - gear rack) ИВ (РИВ) are able to provide not only downshifts, but also upshifts. IW with single-shaft rectifiers are smaller than IW with multi-shaft rectifiers. Further, in the description of the movement of the RIV elements directly related to the transfer of power from the input to the output links, they will be called the main movement, in contrast to the movements associated with the amplitude adjustment of the MMC, which provides a change in the gear ratio.

Known (US 20140123787 A1) RIV with a single-shaft rectifier of mechanical vibrations, characterized in that the gear racks of the main movement (ZRGD) are installed in pairs and towards each other on reciprocating sliders, selected as a prototype.

The disadvantage of this analogue is the instability of spurious oscillations of the ratio of the instantaneous gear ratio (MPO) to the average gear ratio (SPO), which changes with a change in the STR. Such instability leads to the fact that to remove spurious oscillations is possible only for a single STR. The disadvantage is caused by a design feature, the reciprocating slider is connected to the crank or eccentric through the connecting rod, which makes a complex movement.

The technical result of the invention is to ensure the stability of parasitic oscillations in the ratio of MPO to STR, while maintaining the smaller dimensions characteristic of RIV with a single-shaft rectifier.

The technical result is achieved by a combination of restrictive and distinctive features. Restrictive signs - RIV with a single-shaft rectifier of mechanical vibrations, characterized by the fact that the gear racks of the main movement (ZRGD) are installed in pairs and towards each other on reciprocating sliders.

Distinctive features - reciprocating sliders with counter-directed ZRGD engaged, each with its own crank or eccentric with the formation of the Scottish mechanism.

In FIG. 1 shows the kinematic diagram of the RIV on a double crank, conventional top view.

In FIG. Figure 2 shows spurious oscillations of the ratio of the instantaneous gear ratio (MPO) to the average gear ratio (STR) depending on the phase of rotation of the input link of the RIV, expressed in π.

Example 1 of the implementation of the RIV on the double crank (Fig. 1): The RIV contains: MMC, including the input rocker 1, mounted on the input shaft 2, leading the double crank 3 with coordinated adjustable shoulders. The tool for adjusting the length of the shoulders of the double crank is designated as 4 and can be performed as in (A.S. 1414990 USSR, F16H 29/04). The double crank shoulders are 90 degrees apart. Each crank pin 5 is engaged with a reciprocating slider 6. A double crank with reciprocating sliders forms a double Scottish mechanism of variable amplitude. On each reciprocating slider, the ZRGD 7 are cut or mounted, directed in projection onto the plane of rotation of the crank to each other. Each gear rack is coupled to its main drive gear (SHGD) 8. Each SHGD is connected through an overrunning clutch 9 to the rectifier shaft 10. The overrunning clutches and the rectifier shaft comprise a mechanical vibration rectifier. All overrunning clutches are installed to transmit rotation from the SHGD to the output shaft in one direction. When rotation is applied to the input shaft, it is transmitted to the input beam, then to the double crank, the fingers of the crank drive the reciprocating sliders. Reciprocating sliders through ZRGD lead to the oscillatory movement of SHGD, which is transmitted to overrunning clutches. Overrunning clutches translate the oscillatory movements of the SHG into the rotation of the rectifier shaft. Rotational and reciprocating kinematic pairs can be coupled via plain or rolling bearings.

This example demonstrates the solution to a technical problem - ensuring the stability of spurious fluctuations in the ratio of MPO to STR, while maintaining the smaller dimensions characteristic of a RIV with a single-shaft rectifier. Indeed, Scottish mechanisms generate strictly sinusoidal mechanical vibrations, and a rectifier converts them into a curve envelope of the four sinusoids. Moreover, the ratio of MPO to STR 11 (Fig. 2) remains unchanged when the SRO changes.

Example 2 of the implementation of the RIV on a double eccentric, which differs from the implementation of the RIV on a double crank in that the double crank is replaced by a double eccentric. A means of regulating the amplitude of the vibrations of the GMC is made as described in V.F. Maltsev. "Mechanical impulse transmission." M., Mechanical Engineering, 1978, p. 122, Fig. 9th century

In specific embodiments, the RIV may be equipped with a means of reducing or a means of eliminating spurious oscillations, for example, as in the prototype.

Claims (2)

1. Rack pulsed variator with a single-shaft rectifier of mechanical vibrations, characterized in that the gear racks of the main movement (ZRGD) are installed in pairs and towards each other on reciprocating sliders, characterized in that the reciprocating sliders with counter-directed SRGD are engaged with each crank or eccentric with the formation of the Scottish mechanism. 2. The device according to claim 1, characterized in that it is equipped with a means of reduction or a means of eliminating spurious oscillations.

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