CN2898399Y

CN2898399Y - Gear and rack swing hydraulic cylinder

Info

Publication number: CN2898399Y
Application number: CN 200620090071
Authority: CN
Inventors: 徐莲秋
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-31
Filing date: 2006-03-31
Publication date: 2007-05-09
Anticipated expiration: 2016-03-31

Abstract

The utility model relates to a Rack-and-gear hydraulic cylinder for swing which belongs to hydraulic action element of mechanical equipment, characterized in that: the center of an end of piston comprises shaft block, opposite the shaft block, a U form axial trough is arranged on end surface of rack shaft, the piston is floating type after putting the shaft block on piston end surface into the U form axial trough. The seal assembly is composed of U ring, supporting ring and Glyd ring arranged on the circumference surface of piston. A supporting sleeve is arranged in the rack shaft case body, the circumference surface of supporting sleeve comprises inclined surface to contain lower part of gear wheel shaft and the clearance is arranged between the outside diameter of gear wheel shaft and the inclined surface. The utility model has the advantages of reducing wear, improving wear resistance with reliable seal, and avoiding inner discharge with rational structure and convenient installation.

Description

The gear rack oscillating motor

Technical field

The utility model belongs to the hydraulic actuator of machinery, particularly need not any gear and just can make load directly obtain the gear rack oscillating motor of a kind of new structure of reciprocally swinging.

Background technique

At present, in the various mechanisms of equipment such as harbour, metallurgy, electric power, as executive component---the gear rack oscillating motor of output high pulling torque in several angle,, be used widely because it need not any gear and just can make load directly obtain the specific function of reciprocally swinging.The gear rack oscillating motor is made up of cylinder cap, cylinder barrel, piston, Sealing, rack shaft, gear shaft, housing, symmetry is equipped with piston in cylinder barrel, with on the piston circumferential surface that touches mutually in the cylinder barrel or dress U-shaped seal ring or adopt Sealings such as Glais ring, rack shaft at the piston end surface center to be threaded and to be meshed with gear shaft, rack shaft is contained in the housing, start hydraulic transmission, piston makes gear shaft make reciprocally swinging with regard to left and right promotion tooth bar.In use the problem of Chu Xianing mainly is the leakage of oil owing to wearing and tearing cause sealing more relatively poor, and in long-term the use, because the bad leakage of oil of sealing is even more serious, the shortcoming and defect part of its existence is described below:

1. piston and rack shaft are one or fixedly connected with screw thread, under the effect of radial force, the copper sheathing meeting fair wear and tear of supporting tooth bar, piston is along with tooth bar produces radial displacement, produce radial force between piston and the cylinder barrel, when sliding, scratch the cylinder barrel internal surface, and make the inner wall of cylinder abrasion deformation become non-circular, let out in must causing.

2. the independent employing rubber rectangular ring that has of piston seal, the Sealing of this material weares and teares in reciprocating motion of the pistons comparatively fast, causes sealing to be easy to lose efficacy; The independent employing U-shaped circle or the Glais ring that have, but their independent using effect are not very desirable, because the metal filings that produces in the gear rack transmission is in to-and-fro motion, be easy to be stuck between primary seal and the cylinder barrel, destroy primary seal, scratch cylinder barrel, let out in also producing, have in addition enter hydraulic system, hydraulic system is produced harm.

3. the supporting tooth bar is a bit of brasses, produce under the radial force in the gear rack transmission, and the tooth bar to-and-fro motion, the brasses wearing and tearing are very fast, cause piston along with tooth bar produces radial displacement, destroy sealing, let out in the generation.

Summary of the invention

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part, and provides and can reduce wear, and has sealing again reliably, and the gear rack oscillating motor of a kind of new structure rational in infrastructure.

The purpose of this utility model is to adopt following technological scheme to realize: the gear rack oscillating motor comprises cylinder cap, cylinder barrel, piston, Sealing, rack shaft, gear shaft, housing is formed, it is characterized in that: there is a piece at an end center of piston, corresponding with the axle piece, end face at rack shaft has the U profile shaft groove that can hold a piece, axle piece on the piston end surface is inserted in the U profile shaft groove, make piston be floating type piston, on the piston circumferential surface, be furnished with seal combination, the housing built-in hold bearing sleeve of rack shaft is being housed, on the circumferential surface of supporting sleeve, have the inclined-plane that can hold gear shaft lower half portion, and between gear shaft external diameter and inclined-plane spacing is arranged.Be located at the axle piece at piston end surface center, its transverse section or circular or square, on the rack shaft end face, have accordingly and hold a piece or circular or square U profile shaft groove, after the axle piece on the piston is inserted U profile shaft groove, when motion, piston can float in U type groove, so be called floating type piston; After the copper sheathing fair wear and tear of supporting rack shaft, piston can effectively not prevent sliding contact between tooth bar or axle sleeve wearing and tearing back piston and the cylinder barrel along with rack shaft produces radial displacement, consequently scratches cylinder barrel and makes in the cylinder barrel wearing and tearing generation and let out; Described seal combination adopts unique mode, from left to right adorns the seal combination by U-shaped circle, supporting ring, Glais ring combination on the piston circumferential surface in regular turn; Its primary seal adopts the U-shaped circle one, reliably seals hydraulic oil, adopts Glais ring one near the gear rack drive cavity, can wipe impurity such as abrasive dust, dirt that the gear rack transmission produces off, and the protection primary seal is injury-free, prevents that dirt from entering hydraulic system; The low together wearing and tearing of middle employing, the supporting ring that frictional force is little prevent that piston from directly contacting with cylinder barrel; Described supporting sleeve, its end face has a step, and during assembling, a side of step leans against on the housing seam, and opposite side leans against on the end face of cylinder barrel, and during the tooth bar to-and-fro motion, supporting sleeve can not produce axial float.The comprehensive above technical measures of being taked realize the purpose of this utility model.

Compared with prior art, the utility model can reduce wear, improve wear resistance, have again sealing reliable, let out in preventing, and rational in infrastructure, advantage such as easy to install.

Description of drawings

The utility model has a width of cloth accompanying drawing, wherein:

Accompanying drawing 1 is the main TV structure schematic representation of specific embodiment of the utility model.

Among the figure: 1. cylinder barrel 2. piston 3.U shapes are enclosed 4. supporting rings

5. Glais ring 6. rack shafts 7. supporting sleeves 8. gear shafts

9. 11. piece 12.U of housing 10. cylinder caps oblique crank Z groove

Embodiment

In specific embodiment shown in Figure 1, its structure comprises: cylinder cap 10 is housed respectively on cylinder barrel 1, floating type piston 2 is housed respectively in cylinder barrel 1, there is the axle piece 11 of circular cross sections at the end face center of piston 2, corresponding with axle piece 11, end face in rack shaft 6 has rounded U-shaped axial trough 12, on the circumferential surface of the piston 2 that floats, adorn in regular turn respectively by U-shaped circle 3, supporting ring 4, the seal combination that Glais ring 5 is formed, in housing 9, supporting sleeve 7 is housed, have the inclined-plane that can hold gear 8 lower half portions on the supporting sleeve 7, and between the circumferential surface of gear shaft 8 external diameters and supporting sleeve 7 spacing is arranged.

Claims

1. gear rack oscillating motor, comprise cylinder cap (10), cylinder barrel (1), piston (2), Sealing, rack shaft (6), gear shaft (8), housing (9) is formed, it is characterized in that: there is a piece (11) at an end center of piston (2), corresponding with axle piece (11), end face at rack shaft (6) has the U-shaped axial trough (12) that can hold a piece (11), axle piece (11) on piston (2) end face is inserted in the U-shaped axial trough (12), make piston (2) be floating type piston, on the circumferential surface of piston (2), be furnished with seal combination, at the housing that rack shaft (6) are housed (9) built-in hold bearing sleeve (7), on the circumference of supporting sleeve (7), have the inclined-plane that can contain gear shaft (8) lower half portion, and between the external diameter of gear shaft (8) and inclined-plane spacing is arranged.

2. by the described gear rack oscillating motor of claim 1, it is characterized in that: the seal combination that is distributed on piston (2) circumferential surface is combined by U-shaped circle (3), supporting ring (4), Glais ring (5).

3. by the described gear rack oscillating motor of claim 1, it is characterized in that: the end face of supporting sleeve (7) has a step, and an end of step leans against on the seam of housing (9), and the other end leans against on the end face of cylinder barrel (1).

4. by the described gear rack oscillating motor of claim 1, it is characterized in that: the axle piece (11) of an end face of piston (2), its transverse section or circular or square.