A swing frame reset mechanism for a pump

Abstract

The invention discloses a pump swing frame resetting mechanism which comprises a swing frame, a steel ball, a right spring seat, springs, a left spring seat and a ball seat. The steel ball is fixed on the swing frame and is matched with a spherical groove of the right spring seat to constitute a right end spherical hinge. A spherical groove of the left spring seat is matched with the convex semi-spherical surface of the ball seat to constitute a left end spherical hinge. The right spring seat and the left spring seat constitute a piston structure, and the springs are mounted at the position where the right spring seat and the left spring seat are matched and pressed between the right spring seat and the left spring seat. According to the scheme of the pump swing frame resetting mechanism, the end of the left spring seat and the end of the right spring seat are designed to be of a spherical hinge structure, and the two spring seats are matched through the piston structure. The novel structure removes the radial displacement of the left spring seat and the right spring seat in relative movement, and scratching abrasion between the springs and the ends of the spring seats is avoided. Meanwhile, the number and the diameters of oil drainage holes in the spring seats can be changed to adjust the motion characteristics of the resetting mechanism and improve the performance of a pump.

Description

technical field [0001] The invention relates to a swing frame reset mechanism for a pump, which is suitable for a swash plate swing angle self-adaptive reset mechanism of a swash plate type constant pressure variable plunger pump, and belongs to the technical field of plunger pump design. Background technique [0002] When the constant pressure variable plunger pump (hereinafter referred to as the pump) is working, the internal swing frame can rotate slightly around its own rotation axis to meet the external working conditions. Such as figure 1 As shown, the swing frame 1 can swing clockwise around point O under the drive of the piston 2, and the spring 4 can drive the swing frame 1 to swing counterclockwise through the right spring seat 3, and the swing angle θ is generally 0-20°. Right spring seat 3, spring 4 and left spring seat 5 form a kind of conventional pendulum reset mechanism. This reset mechanism has a fundamental disadvantage, such as figure 2 As shown, that ...

AI Technical Summary

Problems solved by technology

The existence of the radial displacement H makes the end of the right spring very easy to scrape against the inner wall of the inner spring, such as image 3 As shown, the larger the swing angle θ, the more serious the scratching, and the scratched damaged spring is easy to break under alternating stress, resulting in failure of the reset mechanism

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