CN202250585U

CN202250585U - Piston shoe for hydraulic motor

Info

Publication number: CN202250585U
Application number: CN2011203414087U
Authority: CN
Inventors: 陈超; 汪锋; 余红波; 杨军昌
Original assignee: LONKING (SHANGHAI) EXCAVATOR MANUFACTURING Co Ltd; Longking (shanghai) Axle & Transmission Co Ltd
Current assignee: LONKING (SHANGHAI) EXCAVATOR MANUFACTURING Co Ltd; Longking (shanghai) Axle & Transmission Co Ltd
Priority date: 2011-09-13
Filing date: 2011-09-13
Publication date: 2012-05-30
Anticipated expiration: 2021-09-13

Abstract

The utility model provides a piston shoe for a hydraulic motor, which comprises a piston shoe body. The piston shoe body is provided with large end face, a groove is arranged on the large end face, a small throttling hole is arranged in the piston shoe body, and the small throttling hole is communicated with the groove. The piston shoe for the hydraulic motor is characterized in that inclined faces are formed on two sides of the groove, and a sealing belt is arranged on the large end face on two sides of the inclined faces. The large end face of the piston shoe adopts the mode that the sealing belt is combined with the inclined faces. Compared with the traditional piston shoe structure, the piston shoe for the hydraulic motor has the advantages that 1 a piston shoe pair is prevented from severe abrasion and shoe burning, and starting efficiency of the motor is favorably improved; 2 the sealing belt on the end face of the piston shoe has sealing effect and can prevent a formed lubrication oil film from being too thick and causing large-amount leakage, simultaneously the sealing belt can be widened gradually under the condition that the end face is abraded to avoid the problem of large leakage amount caused by the fact that oil liquid cleanness damages flatness, so that service life of the hydraulic motor can be improved.

Description

A kind of oil hydraulic motor is used piston shoes

Technical field

The utility model relates to a kind of axial-piston hydraulic motor and uses piston shoes, is used for the hydraulic shovel revolution and drives with walking, belongs to the excavator technical field of hydraulic elements.

Background technique

That various types of excavator machineries are widely used in is civilian, the mechanized construction of communications and transportation, hydraulic engineering, mine excavation and modern military engineering.In axial plunger type motor; The friction pair of piston shoes and swash plate is one of crucial friction pair, and its slip surface should guarantee necessary lubricating condition, and between slip surface, forms the lubricant film of suitable thickness; The formation static pressure supports; Prevent the direct contact of the antithesis auxiliary material of slip surface, prolong the working life of oil hydraulic motor, increase economic efficiency.If lubricant film is too thin, the secondary easy abrasion of piston shoes or burn out then; If lubricant film is too thick, then do not have seal action, cause a large amount of leakages, reduce volumetric efficiency, even can not set up the pressure that adapts with load.

As shown in Figure 1, the piston shoes that use on the present axial plunger type motor comprise piston shoes body 1, and piston shoes body 1 has large end face 2, on large end face 2, have groove 3, are provided with throttling pore 4 in the piston shoes body 1, and throttling pore 4 is connected with groove 3.Said structure is very high to the planeness and the roughness requirement of large end face 2, exists significant limitation, and its shortcoming is: 1, the difficult lubricant film that forms the thickness appropriateness between the friction pair of piston shoes and swash plate, thus cause piston shoes pair heavy wear easily or burn out piston shoes; 2, oil cleanliness is very big to the secondary influence of piston shoes: when fluid impurity has scuffing or piston shoes surface that wearing and tearing are arranged to the piston shoes surface after; The roughness and the planeness on piston shoes surface will be destroyed; Cause a large amount of leakages easily, reduce volumetric efficiency, influence the working life of motor.3, requirement on machining accuracy is higher: because 2 pairs of roughness of large end face and planeness have relatively high expectations, therefore very high to the required precision of processing.

Summary of the invention

The purpose of the utility model provides a kind of piston shoes, can form the appropriate lubricant film of thickness through these piston shoes, to improve the working life of oil hydraulic motor.

In order to achieve the above object, the technological scheme of the utility model has provided a kind of oil hydraulic motor and has used piston shoes, comprises the piston shoes body; The piston shoes body has large end face; On large end face, have groove, in the piston shoes body, be provided with throttling pore, throttling pore is connected with groove; It is characterized in that: the both sides at groove are formed with the inclined-plane, and the part that is positioned at the both sides, inclined-plane at large end face is a sealing strip.

The mode that the large end face of the piston shoes of the utility model adopts sealing strip to combine with the inclined-plane; Compare with traditional piston shoes structure; The advantage of the utility model is: 1, the ramp structure of piston shoes end face is guided the hydraulic oil of throttle orifice into the piston shoes end face; Be easier to form lubricant film, thereby avoid the piston shoes pair heavy wear and the phenomenon of burning boots to occur, help improving the cranking performance rating of motor; 2, the sealing strip of piston shoes end face plays the effect of sealing; Prevent that the lubricant film that forms is blocked up, cause a large amount of leakages, simultaneously; Occur at end face under the situation of wearing and tearing; Sealing strip can progressively be widened, and avoids causing the big situation of amount of leakage because of oil cleanliness destroys planeness, thereby improves the working life of oil hydraulic motor.

Description of drawings

Fig. 1 is the structural representation of former oil hydraulic motor with piston shoes;

A kind of oil hydraulic motor that Fig. 2 provides for the utility model is with the structural representation of piston shoes;

Fig. 3 is the partial enlarged drawing of Fig. 2.

Embodiment

For making the utility model more obviously understandable, now with a preferred embodiment, and conjunction with figs. elaborates as follows.

Like Fig. 2 and shown in Figure 3, a kind of oil hydraulic motor that the utility model provides is used piston shoes, comprises piston shoes body 1; Piston shoes body 1 has large end face 2; On large end face 2, have groove 3, in piston shoes body 1, be provided with throttling pore 4, throttling pore 4 is connected with groove 3; Be formed with inclined-plane 5 in the both sides of groove 3, the part that is positioned at 5 both sides, inclined-plane at large end face 2 is a sealing strip 6.

In the moment that oil hydraulic motor starts, hydraulic oil is through throttling

pore

4, and 5 guide the piston shoes surface apace into through the inclined-plane, forms lubricant film, and large end face 2 is played the effect that static pressure supports, and has avoided the burning boots phenomenon of large end face 2.Simultaneously, because the effect of sealing strip 6, it is blocked up to have limited the lubricant film that forms; Stoped leaking of hydraulic oil effectively, along with oil hydraulic motor increases hydraulic pressure turbidity test variation service time; When large end face 2 had wearing and tearing, when the thickness of large end face 2 slightly reduced, sealing strip 6 sizes then increased to some extent; Better form sealing, avoided volumetric efficiency to descend fast, thereby improved the working life of oil hydraulic motor.

Claims

1. an oil hydraulic motor is used piston shoes; Comprise piston shoes body (1), piston shoes body (1) has large end face (2), on large end face (2), has groove (3); In piston shoes body (1), be provided with throttling pore (4); Throttling pore (4) is connected with groove (3), it is characterized in that: be formed with inclined-plane (5) in the both sides of groove (3), the part that is positioned at both sides, inclined-plane (5) at large end face (2) is sealing strip (6).