CN1205675A - Lift mast roller assembly for lift structure of fork lift truck - Google Patents

Abstract

A lift mast roller assembly (10) for a lift structure of a fork lift truck, comprising in combination an axle bar (9) fixedly attached to a component of a lift mast structure of the fork lift truck and a substantially annular lift mast roller (13), journalled on said axle bar (9) in a rolling bearing (12) having an inner race ring (24), an outer race ring (20) and a number of rollers (21) disposed therebetween, wherein the inner race ring (24) is fitted with a tight fit on the axle bar (9), the outer race ring (20) is axially affixed relative to the lift mast roller (13), and the rolling bearing is a self-aligning roller bearing wherein the rollers (21) and race tracks provided in the race rings (20, 21) have correspondingly curved longitudinal section profiles with radius of curvature substantially greater than the greatest distance between the central bearing axis and the surfaces of the race tracks, wherein the rollers are axially moveable without restrictions from axial limitations.

Description

The lifting arm roll assembly of forklift truck lifts structure

The present invention relates to be used for the lifting arm roll assembly of forklift truck lifts structure.

One of main portion of forklift is to promote structure, and it is equipped with fixing outer bar, and outer bar has with two spaced apart and interconnective columns of U-lag inwardly; And interior bar, interior bar have two interconnective, by the groove of outer bar guiding and the column that in groove, vertically moves.Supporting the fork balladeur train at interior bar lowermost part, crotch then two lift forks by the fork rack bearing.This bar structure is provided with a plurality of lifting arm rollers, and bar and lift fork can be done vertical adjustment in it made.These lifting arm rollers are dissimilar, and some of them only are used for radial load, and other bar rollers will support integrated load.Bolster is to being bearing in double-row radial thrust ball bearing or two tapered roller bearings with the lifting arm roller of integrated load radially.

Only support those lifting arm rollers of radial load, if load is less, can be contained in and be installed in the deep-groove bearing, but, if load increases, then must be installed in two tapered roller bearings or the full-complement cylinder roller bearing (cylindrial full complement roller bearing).But using the great and significant disadvantages of of above-mentioned bearing is that to deal with the ability of mis-alignment very limited.Yet when column that roller turns round thereon or beam were not really parallel on its entire longitudinal length, mis-alignment was again a common phenomena, uses above-mentioned bearing can cause in bearing or deletrious edge load on the roller enveloping surface, thereby reduces bearing life.In order to address this problem, use spherical roller bearing sometimes.The enveloping surface of lifting arm roller is by the groove of column guiding, thereby the danger of too big angle mis-alignment can not take place race ring at work, still, if above-mentioned danger just might take place as the wheel bearing that does not have external orientation in bearing.Another shortcoming of spherical roller bearing is, the bearing portions height is relatively large, and in other words, bearing outer race must have less part height with bulged-in lifting arm roller, that is to say, when lifting arm roller external diameter one regularly must use the less bearing with low load-carrying capacity.When using partly highly little lifting arm roller, this will cause the load-carrying capacity of roller less, that is to say, the stress in the bearing increases, and load has a negative impact to the bearing internal geometry.

Therefore, the purpose of this invention is to provide the lifting arm roll assembly described in a kind of claim 1 preamble, its structure is overcome above-mentioned shortcoming to a great extent, and this is to realize by the feature that assembly is had in claim 1 characteristic.

Illustrated embodiment describes the present invention in detail in conjunction with the following drawings now.

Fig. 1 is the block diagram of an embodiment that has the forklift of lifting arm;

Fig. 2 is the block diagram of more detailed expression lifting arm structure;

Fig. 3 is the block diagram of the movable inner frame part of lifting arm structure shown in Figure 2;

Fig. 4 is the block diagram of lifting arm structure outside frame part shown in Figure 2, and outside frame partly is fixedly connected on body construction.

The exploded perspective view of Fig. 5 is represented to constitute according to a lifting arm roller part of the present invention, is positioned at the part of position as shown in Figure 3.

Fig. 6 is the cutaway view according to lifting arm roll assembly of the present invention.

Fig. 1 is the block diagram of an embodiment of forklift 1.Wheeled vehicle body is provided with and promotes structure is lifting arm 2, and it is equipped with and is fixedly connected on vehicle body 1 and comprises the two root post 3a that linked to each other by crossbeam 4, the first vertical substantially framework 3 of 3b, and also have two root post 5a, 5b and second framework 5 that is connected crossbeam 6.Second framework 5 is at the column 3a of the first fixing framework 3, and in the vertical direction can vertically move between the 3b, and at a fork of its lower end carrying balladeur train 7, two forks 8 is housed on the fork balladeur train.Be arranged on the diverse location between two frameworks 3 and 5 according to lifting arm roll assembly of the present invention, also be connected in the fork balladeur train, so that displacement and guiding mutually, and make each structure fixing on the throne.

One embodiment of the more detailed expression lifting arm 2 of the block diagram of Fig. 2, it has outside frame 3 and inner frame 5, represents inner frame 5 and outside frame 3 in Fig. 3 and 4 respectively.

From above-mentioned accompanying drawing as can be seen, the column 3a of outside frame 3 and 3b are the U-shaped beams, the flute profile open side of every root post is to another root post, thereby outside frame 3 has two relative parallel slots, can accommodate the column 5a and the 5b of inner frame 5 in the groove, and in the relative longitudinal travel process of inner frame in outside frame, play the guiding role.The formation of inner frame 5 is similar to outside frame 3, in the illustrated embodiment, is provided with from column 5a, and stretch out in the outside of 5b,, stretches into the axostylus axostyle 9 in the groove of outside frame 3 that is.Lifting arm roll assembly 10 of these axostylus axostyles 9 every supportings, assembly 10 are in the motion process of inside casing 5 with respect to outside frame 3, and also supporting and guiding inside casing 5 when their mutual holding positions.The lower beam 4 of outside frame 3 is provided with the guiding roller assembly 11 (Fig. 4) of fork balladeur train.It should be noted that the lifting arm structure is equipped with many other parts certainly, for example sprocket wheel, flexible pipe rolling wheel etc., but to be drawing clear and do not draw for these parts, and they are to also there is no direct influence according to lifting arm roll assembly of the present invention.

The exploded drawings of Fig. 5 is represented the vital parts according to lifting arm roll assembly 10 of the present invention, that is, and and axostylus axostyle 9, cylindrical bearing 12 and bar roller 13.

Fig. 6 represents according to complete bar roll assembly 10 of the present invention.Axostylus axostyle 9 is fixed on supporting structure 15 by weld seam 14, and for example on the wall of inner frame 5, the rear end of axostylus axostyle 9 gets at by a Kong Kecong supporting structure opposite side on the structure 15.The rear end of axostylus axostyle is provided with lubricated ozzle 16, it with pass the base pipe 17 of axostylus axostyle 9 and be communicated with to the end opposite opening.Bar roller 13 itself has a through hole 18, has shoulder 19 at the one end.The outer race 20 of cylindrical bearing 12 is a tight fit in the through hole 18 and against above-mentioned shoulder 19, bearing 12 can receive mis-alignment and het expansion, roller 21 can be moved axially, will self be adjusted to suitable position, thereby but make bearing track relative tilt and longitudinal travel.Described this bearing in No. the 0175858th, the European patent, this patent is incorporated by reference in this manual.Spacer ring 22 is set in the face 18 outside outer race 20, outer race 20 and plate-like enclosing cover 23 are separated, enclosing cover 23 is as the exterior hub cap of bearing.Enclosing cover 23 can prevent that foreign matter from entering bearing, and can prevent at work that lubricant from spilling from the free end of lifting arm roll assembly 10.The race, inner 24 of bearing 12 is pressed on the free end of axostylus axostyle 9, thereby with the flush fit dress thereon, its position also guarantees by a retainer 25.

By above-mentioned layout, two seat rings 20 of bearing 12 and 24 are flush fit assemblings, because the character of used bearing, the bearing in the assembly does not receive any axial load.This make two seat rings all obtain friction tight possibility mean seat ring and the seat between can not wear and tear, in other words, bearing does not have worn-down danger, also do not form the danger of abrasion, if above-mentioned situation can cause then that preamble mentions as using plain bearing to kill with regard to contingent axial load lower roll, make the situation in bearing crack.

For example compare with spherical roller bearing, bearing 12 has very little system height, and in other words, the system heights of bar roller 13 itself can guarantee quite high value, thereby outer race can be subjected to non-yielding prop, makes bearing that be arranged long service life.

Employed bearing 12 can have roller separator or not have the roller separator form, but will fill roller, thereby has further strengthened the intensity of external crossbar collars 13.

Even the outer race of bearing can be designed to bar roller itself, thus the intensity of outer race further strengthened, but this improved bearing only is applicable to this special task.

By the sending into that side of lubricant (fat) to the bar roll assembly and use enclosing cover 23 of bearing, can make by bearing and oppress grease backward.

Also there are enough clearance envelopes in spacer ring 22 between enclosing cover and the outer race 20 in the time of can guaranteeing even work the centre bearer longitudinal travel.At opposition side, that is, in the zone of the shoulder 19 of through hole 18, axostylus axostyle 9 has a larger-diameter part, and this part forms groove sealing 26 together with the bar roller, and it also is used to limit the contingent inclination of bearing.

The present invention is not limited to diagram and the above embodiments, can do various modifications in the scope of claims.

Claims (5)

1. the lifting arm roll assembly (10) that is used for the forklift truck lifts structure, it comprises an axostylus axostyle (9) and the ringwise substantially lifting arm roller (13) that is contained on the described axostylus axostyle (9) on the member that is fixedly mounted in forklift truck lifts bar structure in antifriction-bearing box (12), described bearing has a race, inner (24), an outer race (20) and many rollers (21) that is arranged on therebetween, it is characterized in that: race, inner (24) is assemblied on the axostylus axostyle (9) with flush fit, outer race (20) is with respect to lifting arm roller (13) axial restraint, antifriction-bearing box (12) is a self-aligning roller bearing, wherein, roller (21) and be located at bearing track (20 in the seat ring, 21) has the vertical sectional shape of respective curved, radius of curvature is significantly greater than the ultimate range between bearing axis and the bearing track surface, roller can move axially, and does not have the restriction of axial limit.

2. lifting arm roll assembly according to claim 1 (10) is characterized in that: bearing outer race (20) also with flush fit be assemblied in the lifting arm roller (13) the seat in.

3. lifting arm roll assembly according to claim 1 (10) is characterized in that: bearing outer race and lifting arm roller form integral body.

4. according to the described lifting arm roller of aforementioned arbitrary claim, it is characterized in that: axostylus axostyle (9) is provided with one and passes axostylus axostyle, at the uncovered lubrication management (17) of bearing (12) opposite side, the opening of described lubrication management is covered by an enclosing cover (23), forces the lubricant of introducing by lubrication management (17) to return by bearing (12).

5. lifting arm roll assembly according to claim 4 is characterized in that: described enclosing cover (23) and bearing outer race (20) are spaced apart, make the bearing can longitudinal travel.

Images