CN215921794U - Rear swing frame assembly and loader - Google Patents

Abstract

The utility model relates to a swing frame for a loader, aiming at solving the problem of high manufacturing cost of the existing rear swing frame of a drive axle, the utility model constructs the rear swing frame of the drive axle and the loader, wherein a rear swing frame assembly comprises a support, a swing frame with a hub part sleeved on the support and a pressing plate fixed at the rear end of the support and used for limiting the backward movement of the swing frame; the front side and the rear side of the rear thrust washer are correspondingly contacted with the hub and the pressure plate; a bush is arranged between the hole wall of the inner hole of the hub part and the cylindrical surface of the support; the support is provided with a supporting surface vertical to the axial direction, a front thrust washer is arranged between the front end of the hub and the supporting surface, and the front side surface and the rear side surface of the front thrust washer are in contact with the hub correspondingly to the supporting surface. In the rear swing frame assembly, the front and rear direction bouncing limiting structure of the swing frame is simple, and the manufacturing cost is reduced.

Description

Rear swing frame assembly and loader

Technical Field

The utility model relates to a swing frame for a loader, in particular to a rear swing frame assembly and a loader.

Background

The rear drive axle of the loader is connected with the frame through the front swing frame assembly and the rear swing frame assembly. As shown in fig. 1, the rear swing frame assembly includes a support 2 and a swing frame 3 sleeved on the support. The swing frame 3 is composed of a hub 31 in the middle and arm supports 32 on both sides of the hub. The inner hole of the hub part is sleeved with the support 2, so that the swing frame 3 swings on the support 2. Support 2 passes through support construction bolt rigid fixation in the rear side of the axle housing 1 of transaxle, and the hub hole is the shoulder hole, and its anterior aperture section cup joints with support 2. The rear end of the support 2 is fixed with a pressure plate 4 through a pressure plate mounting bolt, the pressure plate 4 is positioned in the large aperture section of the hub inner hole, and the radial dimension of the pressure plate 4 is larger than the aperture of the small aperture section of the hub inner hole. A cover plate 5 for closing the rear end of the inner hole of the hub is arranged at the rear end of the hub through a cover plate mounting bolt. A bushing 6 is arranged between the inner hole wall surface of the small-aperture section of the inner hole of the hub and the cylindrical surface of the support, a front thrust washer 7 is arranged between the front side surface of the pressure plate 4 and the rear end surface of the small-aperture section of the inner hole of the hub, and a rear thrust washer 8 is arranged between the rear side surface of the pressure plate 4 and the cover plate 5. An oil seal 13 is arranged between the inner hole wall surface of the small-aperture section of the hub and the cylindrical surface of the support, and the oil seal 13 is positioned at the front end of the bushing 6.

According to the structure of the existing rear swing frame assembly, when the loader starts, the instantaneous pressure plate 4 is in contact pressure bearing with the rear end face of the small-bore section of the inner bore of the hub through the front thrust washer 7, and when the loader stops, the instantaneous pressure plate 4 is in contact pressure bearing with the cover plate 5 fixed on the hub through the rear thrust washer 8. Therefore, this structure requires not only high connection strength between the pressure plate 4 and the holder 2 but also high connection strength between the cover plate 5 and the hub, and the cover plate 5 has a sufficient thickness and is mounted by using a cover plate mounting bolt having a sufficient strength. This results in an increase in manufacturing costs.

SUMMERY OF THE UTILITY MODEL

The utility model provides a rear swing frame assembly and a loader, aiming at solving the technical problem of high manufacturing cost of a rear swing frame assembly of a drive axle, so as to reduce the manufacturing cost of the rear swing frame assembly.

The technical scheme for realizing the purpose of the utility model is as follows: constructing a rear swing frame assembly, which comprises a support, a swing frame with a hub part sleeved on the support, and a pressure plate fixed at the rear end of the support and used for limiting the backward movement of the swing frame; the front side and the rear side of the rear thrust washer are correspondingly contacted with the hub and the pressure plate; a bush is arranged between the hole wall of the inner hole of the hub part and the cylindrical surface of the support; the support is provided with a supporting surface vertical to the axial direction, a front thrust washer is arranged between the front end of the hub and the supporting surface, and the front side surface and the rear side surface of the front thrust washer are in contact with the hub correspondingly to the supporting surface. In the utility model, the limit of the backward movement of the swing frame relative to the support is realized by the pressure plate and the bolt for mounting the pressure plate on the support, the limit of the forward movement of the swing frame relative to the support is realized by the support, the support is usually a casting part and has enough strength to limit the swing frame, so that the forward and backward movement of the swing frame is limited.

In the rear swing frame assembly, a front recess for accommodating the front thrust washer is formed in the front end face of the hub and/or the support face, a front seal groove for accommodating a front seal ring is formed in a face which is relatively matched with one of the front end face of the hub and the support face, and the front seal groove is located on the radial outer side of the front recess. Or a front recess for accommodating the front thrust washer is arranged on the front end face of the hub, an oil seal is arranged between the radial side face of the front recess and the radial side face of the support, and the oil seal is positioned on the front side of the front thrust washer.

In the rear swing frame assembly, a rear recess for accommodating the rear thrust washer is formed in the front side surface of the pressure plate and/or the rear end surface of the hub, a rear seal groove for accommodating a rear seal ring is formed in one of the rear end surface of the hub and the front side surface of the pressure plate which are matched with each other, and the rear seal groove is located on the radial outer side of the rear recess.

In the rear swing frame assembly, a grease filling hole communicated with the rear recess is formed in the pressure plate; the front part of the hub part is provided with a ventilation plug communicated with the front recess.

In the rear swing frame assembly, the rear part of the inner hole of the hub part can be stepped, the bushing is positioned in the small-aperture section of the front part, the pressure plate is positioned in the large-aperture section of the rear part, the radial dimension of the pressure plate is larger than the aperture of the small-aperture section, and the rear end of the hub part is fixedly provided with a sealing plate for sealing the rear end of the inner hole of the hub part. Furthermore, the rear part of the hub is provided with a grease filling hole which is communicated with the inner hole of the hub in the radial direction; if necessary, a ventilation plug communicated with the front recess is arranged at the front part of the hub.

In the rear swing frame assembly, the front end of the bushing is in contact connection with the rear side surface of the front thrust washer, and the rear end of the bushing is in contact connection with the front side surface of the rear thrust washer. Further, the outer cylindrical surface of the bushing is in interference fit with the wall surface of the inner hole of the hub, and the inner cylindrical surface of the bushing is in clearance fit with the outer cylindrical surface of the support.

The technical scheme for realizing the purpose of the utility model is as follows: a loader is constructed, comprising a rear drive axle and a rear frame connected by a swing frame assembly, characterized in that the swing frame assembly has the aforementioned rear swing frame assembly therein. The pressure plate is contacted with the rear end of the hub through the rear thrust washer to bear pressure at the moment of starting the loader, and the front part of the hub is contacted and pressed with the supporting surface on the support through the front thrust washer at the moment of stopping. The support is usually a casting part, so that the support has enough strength to limit forward leaping of the swing frame, the forward and backward leaping of the swing frame is limited, and only the strength of the pressure plate and the strength of the bolt for mounting the pressure plate need to be considered, so that the limiting structure is simplified, and the manufacturing cost is reduced.

Compared with the prior art, in the rear swing frame assembly, the swing frame is limited in the forward and backward movement, and only the strength of the pressing plate and the strength of the bolt for mounting the pressing plate need to be considered, so that the limiting structure is simplified, and the manufacturing cost is reduced.

Drawings

Fig. 1 is a schematic structural view of a conventional rear swing frame assembly.

Fig. 2 is a schematic view of a connecting structure of a rear frame and a rear drive axle of the loader.

FIG. 3 is a schematic view of the connecting structure of the rear drive axle and the swing frame assembly of the loader.

Fig. 4 is a schematic view of a first embodiment of the rear swing frame assembly of the present invention.

Fig. 5 is a schematic view of a second embodiment of the rear swing frame assembly of the present invention.

Fig. 6 is a schematic view of a third embodiment of the rear swing frame assembly of the present invention.

Part names and serial numbers in the figure:

the rear frame 100, the rear drive axle 101, the front swing frame assembly 102 and the rear swing frame assembly 103.

The axle housing 1, a support 2, a support mounting bolt 21, a swing frame 3, a hub 31, a swing arm 32, a front round lug 33, a main body 34, a rear round lug 35, a pressure plate 4, a pressure plate mounting bolt 41, a grease filling hole 42, a cover plate 5, a bush 6, a front thrust gasket 7, a rear thrust gasket 8, a ventilation plug 9, a front sealing ring 10, a rear sealing ring 11, a sealing plate 12, a sealing plate mounting bolt 121 and an oil seal 13.

Detailed Description

The following description of the embodiments refers to the accompanying drawings.

The first embodiment.

As shown in fig. 2, the loader of the present embodiment includes a rear drive axle 101 and a rear frame 100 connected by a swing frame assembly, and as shown in fig. 3, the swing frame assembly is composed of a rear swing frame assembly 103 and a front swing frame assembly 102, the rear swing frame assembly 103 being mounted on the rear side of the rear drive axle 101, and the front swing frame assembly 102 being mounted on the front side of the rear drive axle 101.

As shown in fig. 4, the rear swing frame assembly 103 includes a support 2, a swing frame 3, and a pressing plate 4 fixed at the rear end of the support for limiting the backward movement of the swing frame.

The front end of the support 2 is fixed on the axle housing 1 of the rear drive axle through a support mounting bolt 21, and the rear part of the support 2 is similar to a shaft and is rotationally connected with the swing frame 3.

The main body 34 of the swing frame 3 is made of thick steel plate, the middle part of the main body is provided with a hole which is sleeved with the support 2, and in order to increase the contact area between the swing frame 3 and the support 2, a round lug is welded on the front side and/or the rear side of the part, provided with the hole, in the middle part of the main body 34 so as to increase the length of the hole, namely the contact area between the swing frame and the support 2. The round lug welded on the front side and/or the rear side and the middle part of the main body 34 form a hub part 31 of the swing frame 3, and the inner hole of the round lug is coaxial with the hole in the middle part of the main body and forms a hub inner hole which is sleeved with the support 2. The parts of the two sides of the main body form a swing arm 32 of the swing frame, and the tail end of the swing arm 32 is fixedly connected with the rear frame 100 of the loader. In the present embodiment, a front circular lug 33 is welded only to the front side of the main body 34, and the front circular lug and the middle of the main body constitute the boss portion 31.

The pressure plate 4 is fixed at the rear end of the support 2 through a pressure plate mounting bolt 41, and the pressure plate 4 is disc-shaped, and the diameter of the pressure plate 4 is larger than the aperture of the inner hole of the hub. A circular rear recess is arranged on the front side surface of the pressing plate 4, a rear thrust washer 8 is arranged and mounted in the rear recess, the front side surface of the rear thrust washer 8 is in contact with the rear end surface of the hub 31, and the rear side surface of the rear thrust washer 8 is in contact with the pressing plate 8. And a rear sealing groove is arranged in the radial outer side area of the rear recess on the front side surface of the pressure plate, and a rear sealing ring 11 is arranged in the rear sealing groove. The rear seal ring 11 is fitted to the rear end face of the hub to seal the gap between the pressure plate 4 and the rear end face of the hub, so that the lubricating oil in the inner bore of the hub cannot flow out from the gap between the pressure plate 4 and the rear end face of the hub. A rear seal groove provided on the front side surface of the pressure plate may also be provided on the rear end surface of the boss portion. The back recess arranged on the front side surface of the pressure plate can also be arranged on the back end surface of the hub part, or the front side surface of the pressure plate and the back end surface of the hub part are both provided with recesses, and the back thrust washer 8 is arranged in a space formed by the two recesses on the front side surface of the pressure plate and the back end surface of the hub part.

And a bushing 6 is arranged in the inner hole of the hub, the outer cylindrical surface of the bushing 6 is in interference fit with the wall surface of the inner hole of the hub, and the inner cylindrical surface of the bushing 6 is in clearance fit with the outer cylindrical surface of the support 2. The rear end of the bush 6 is in contact connection with the front side of the rear thrust washer 8. A grease filling hole 42 is formed in the pressing plate 4, the grease filling hole 42 is communicated with the rear recess, a grease nipple is installed in the grease filling hole 42, and lubricating oil filled through the grease nipple enters the rear recess and a gap between the bushing and the cylindrical surface of the support to lubricate the rear thrust washer and the bushing.

The support 2 is provided with a supporting surface matched with the front end surface of the hub, and the supporting surface is vertical to the axial direction of the support 2. The front end face of the hub is provided with a front recess, a front thrust washer 7 is installed in the front recess, the front side face of the front thrust washer 7 is in contact with the supporting face, and the rear side face of the front thrust washer 7 is in contact with the hub. The front end of the bush 6 is in contact with the rear side of the front thrust washer 7. A front sealing groove is arranged on the supporting surface and positioned in the radial outer side area of the front thrust washer 7, a front sealing ring 10 is installed in the front sealing groove, the front sealing ring 10 is matched with the front end face of the hub to seal the gap between the front end face of the hub and the supporting surface, and lubricating oil in the inner hole of the hub cannot flow out from the gap between the front end of the hub and the support. The front recess arranged on the front end face of the hub part can also be arranged on the supporting surface, or the supporting surface and the front end face of the hub part are both provided with recesses, and the front thrust washer 7 is arranged in a space formed by the supporting surface and the front end face of the hub part. Similarly, a forward seal groove may be provided on the hub forward face.

The vent plug 9 is arranged on the hub, the vent plug 9 is communicated with the front recess, when lubricating oil is filled into the gap between the swing frame and the support through the grease filling hole, air in the gap between the swing frame 3 and the support 2 is discharged through the vent plug 9, and when the gap is filled with the lubricating oil, the lubricating oil overflows from the vent plug 9, so that a worker can stop filling the lubricating oil after seeing the lubricating oil.

In the embodiment, the pressure plate 4 is contacted and pressed with the rear end surface of the hub through the rear thrust washer 8 at the moment of starting the loader, and the front end surface of the hub is contacted and pressed with the supporting surface on the support through the front thrust washer 7 at the moment of stopping. Since the support 2 is typically a casting, it has sufficient strength to cope with the forces of the forward bouncing of the swing frame, without extra strength increasing measures. The swing frame is limited in the forward and backward movement, only the strength of the pressing plate 4 and the pressing plate mounting bolts 41 need to be considered, and compared with the prior art, the swing frame is not provided with the cover plate and the cover plate mounting bolts fixed on the rear end face of the hub, so that the limiting structure is simplified, and the manufacturing cost is reduced.

Example two.

As shown in fig. 5, compared with the first embodiment, the front recess on the front end surface of the hub in the present embodiment is in a two-step shape, in which not only the front thrust washer 7 but also the oil seal 13 are installed, and the lip of the oil seal 13 is engaged with the cylindrical side surface of the holder 2. Because the oil seal 13 is matched and sealed with the cylindrical surface of the support 2 by means of self elasticity, the pressure which can be borne by the seal is limited, and when lubricating oil is filled through the grease filling hole 42, the air pressure in the gap between the swing frame 3 and the support 2 is discharged from the oil seal 13 when reaching a certain degree. The lubricating oil can overflow from the oil seal when the gap is full of the lubricating oil, so that the worker can stop filling the lubricating oil after seeing the lubricating oil. Since the oil seal 13 can perform the functions of sealing and air discharging, a vent plug may not be provided in the present embodiment. In the rear swing frame assembly in the present embodiment, the principle of the front-rear direction bouncing limit of the swing frame is the same as that in the first embodiment.

Example three.

As shown in fig. 6, the present embodiment is different from the present embodiment in the hub rear end seal structure. In the present embodiment, the front and rear sides of the swing frame main body are welded with round lugs, and the front round lug 33, the rear round lug 35 and the middle of the main body together constitute the boss 31. The inner hole of the rear circular lug 35 is larger than the hole on the main body 34, so that the inner hole of the hub part is a stepped hole, the pressure plate 4 is positioned at the large-aperture section of the inner hole of the hub part, the bushing 6 is positioned at the small-aperture section, and the radial size of the pressure plate 4 is larger than that of the small-aperture section. The rear thrust washer 8 is disposed between the front side of the pressure plate and the end face of the small bore section (i.e., the rear side of the body 34). A seal plate 12 is provided at the rear end of the hub, and the seal plate 12 is fixed to the rear end surface of the hub by seal plate mounting bolts 121 to seal the rear end of the hub inner hole. Accordingly, a grease injecting hole 42 is provided at the rear end of the hub (on the rear lug 35), and the grease injecting hole 42 communicates with the inner bore of the hub. Therefore, in the present embodiment, no seal ring is provided between the pressure plate 4 and the boss portion 31, the seal plate 12 seals the pressure plate 4 in the inner hole of the boss portion 31, and there is no gap for oil leakage from the outside at the rear end of the boss portion. In the rear swing frame assembly in the present embodiment, the principle of the front-rear direction bouncing limit of the swing frame is the same as that in the first embodiment. The seal plate 12 and the seal plate mounting bolt 121 in this embodiment only serve to seal the rear end of the inner hole of the hub portion, and do not participate in the force transmission during the forward and backward movement limiting process of the swing frame 3, so that the strength requirement is low, and the implementation cost is relatively low.

Claims (10)

1. A rear swing frame assembly comprises a support, a swing frame with a hub part sleeved on the support, and a pressure plate fixed at the rear end of the support and used for limiting the backward movement of the swing frame; the front side and the rear side of the rear thrust washer are correspondingly contacted with the hub and the pressure plate; a bush is arranged between the hole wall of the inner hole of the hub part and the cylindrical surface of the support; the support is provided with a supporting surface vertical to the axial direction, a front thrust washer is arranged between the front end of the hub and the supporting surface, and the front side surface and the rear side surface of the front thrust washer are in contact with the hub correspondingly to the supporting surface.

2. The aft swing frame assembly as defined in claim 1 wherein the hub forward end surface and/or the bearing surface is provided with a forward recess for receiving the forward thrust washer, and a forward seal groove for receiving a forward seal ring is provided on a surface of the hub forward end surface and/or the bearing surface that is opposite to and engages one of the hub forward end surface and the bearing surface, the forward seal groove being located radially outward of the forward recess.

3. The aft swing frame assembly as defined in claim 1, wherein the hub portion has a front recess formed in a front end surface thereof for receiving the front thrust washer, and wherein an oil seal is formed between a radial side surface of the front recess and a radial side surface of the support block, the oil seal being located on a front side of the front thrust washer.

4. The rear swing frame assembly according to claim 2 or 3, wherein a rear recess for receiving the rear thrust washer is provided on the front side surface of the pressure plate and/or the rear end surface of the boss, and a rear seal groove for receiving a rear seal ring is provided on a surface of one of the rear end surface of the boss and the front side surface of the pressure plate which face each other, the rear seal groove being located radially outside the rear recess.

5. The rear swing frame assembly according to claim 4, wherein the pressure plate is provided with a grease filling hole communicating with the rear recess; the front part of the hub part is provided with a ventilation plug communicated with the front recess.

6. The rear swing frame assembly according to claim 2 or 3, wherein the rear portion of the hub inner hole is stepped, the bushing is located in the small-diameter section of the front portion, the pressure plate is located in the large-diameter section of the rear portion, the radial dimension of the pressure plate is larger than the diameter of the small-diameter section, and a sealing plate for sealing the rear end of the hub inner hole is fixedly installed at the rear end of the hub.

7. The rear swing frame assembly according to claim 6, wherein a rear portion of the hub portion is provided with a grease filling hole communicating with an inner hole of the hub portion.

8. The aft swing frame assembly defined in claim 1, wherein the forward end of the bushing is in contact with the rear side of the forward thrust washer and the aft end of the bushing is in contact with the forward side of the aft thrust washer.

9. The aft swing frame assembly as defined in claim 8, wherein an outer cylindrical surface of the bushing is an interference fit with the hub bore wall surface and an inner cylindrical surface of the bushing is a clearance fit with an outer cylindrical surface of the support block.

10. A loader comprising a rear drive axle and a rear frame connected by a swing frame assembly, wherein the swing frame assembly has a rear swing frame assembly as claimed in any one of claims 1 to 9 incorporated therein.

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