US3782647A - Gyratory crusher with hydraulic adjustment of the crusher - Google Patents

Abstract

A gyratory crusher provided with hydraulic adjustment of the crusher gap is provided with a vertical stationary tubular shaft in which is slidably adjustably mounted a supporting shaft carrying at its upper end a segmental spherical bearing for rotatably supporting the crusher cone. The lower end of the supporting shaft carries a spring acting as overload safety device and the lower end of this spring engages a hollow cylindrical cup which is supplied from the exterior of the crusher with a lubricant which is conducted from the cup by a central longitudinal passage in the supporting shaft to said spherical bearing. A piston-cylinder unit engaging the lower end of the cup, preferably by use of a pressure member having one face formed as a sperical bearing is supplied from the exterior with a hydraulic fluid so as to axially adjust the piston, the cylindrical cup, the supporting shaft and the spherical bearing when the crusher cone and therewith the crusher gap is to be adjusted.

Description

United States Patent 1 1191 Decker et al.

1451 Jan. 1,1974

[22] Filed:

[21] Appl. No.: 230,261

[ 41 GYRATORY CRUSHER WITH HYDRAULIC ADJUSTMENT OF THE CRUSHER [75] Inventors: Hanns Decker, Cologne; Helmut Stoekmann, Wesseling; Heinz 1 Hurtmanns, Cologne, all of Germany [73] Assigneez Klockner-Humboldt Deutz Aktiengesellschaft, Cologne, Germany Feb. 29, 1972 [30] Foreign Application Priority Data Mar. 5, 1971 Germany P 21 10 476.7 Apr. 21, 1971 Germany.... P 21 19 223.4 June 26, 1971 Germany P 21 31 901.7

[52] US. Cl; 241/215, 241/286 [51] Int. Cl. B02c 2/04 [58] Field of Search 241/207, 208, 211,

[56] References Cited UNITED STATES PATENTS 10/1970 Decker et a1. 241/208 3/1963 Kyeneman et al. 241/216 9/1948 Van Zandt 241/215 5/1944 Johnson ..241/211 10/1959 MacLeod .241/213 x Primary Examiner-Granville Y. Custer, Jr. 1 Assistant Examiner-Howard N. Goldberg Attorney- -Benjamin H. Sherman et al.

[ 5 7] ABSTRACT A gyratory crusher provided with hydraulic adjustment of the crusher gap is provided with a vertical'stationary tubular shaftin which is slidably adjustably mounted a supporting shaft carrying at its upper end a segmental sphericalbearing for rotatably supporting the crusher cone. The lower end of the supporting shaft carries a spring acting as overload safety device and the lower end of this spring engages a hollow cy- 1 lindrical cup which is supplied from the exterior of the crusher with a lubricant which is conducted from the cup by a central longitudinal passage in the supporting shaft to said spherical bearing. A piston-cylinder unit engaging the lower end of the cup, preferably by use of a pressure member having one face formed as a sperical bearing is supplied from the exterior with a hydraulic fluid so as to axially adjust the piston, the cylindrical cup, the supporting shaft and the spherical hearing when the crusher cone and therewith the crusher gap is to be adjusted.

5 Claims, 5 Drawing Figures PA TENTEU JAR SHEET 3 0F 5 FIG. 3

1 GYRATORY CRUSHER WITH HYDRAULIC ADJUSTMENT OF THECRUSHER The inventiorr relates to a gyratory crusher with hydraulic adjustment of the width of the crusher gap, and

concerns particularly a gyratory crusher without a crossarm, whose crusher cone is supported by means of a spherical supporting bearing on a longitudinally slidable supporting: shaft, which is mounted in a vertically disposed stationary tubular shaft, wher eby the supporting shaft at its end opposite the one on which the supporting bearing: isarranged is provided with a. spring structure functioning as an overload saftey device.

A gyratory crusher of the above mentionedtypeis known in which thelower end of thevertical stationary tubular shaft isconstructed as a hollow cylinder which has mounted therein arfreely movable piston which engages the lower free end of a biased spring structure serving as overload safety device. This type of construction of a gyratory crusher is very reliable when the gyratorycrushers are of a small size ln large gyratory fcrushers in which the crusher cone diameter is about 1,200 mm. oreven larger, the construction of such largedevices and the assembly of the same presents difficulties An object of the invention is to improvethe known construction of gyrat ory crushers in such a manner that particularly crushers of the largest diametersmay be manufactured without difficulties in construction and assemblyflnaccordance with the invention the free lower end of the spring structure is supportedupon an individual piston-cylinder unit serving for the adjust= ment of the crusher gap. The construction of the gymtory crusherof the invention permits in an advantageousmanner, ayseparate manufacture of the tubular shaft, of the supporting shaft, and of the piston-cylinder unit, whereby owing to the arrangement ofan individual piston-cylinder unit, an additional advantage is obtained, in that one may employ commercially obtain able piston-cylinder units manufactured by special manufacturers. Another advantage of the invention is t that not. only the overload safety device, but also the r piston-cylinder unit, which comprises parts subject to i wear, maybe removedfrom the crusher independently of eachother and may be separately serviced, so that a simple exchange of these parts produces a gyratory crusher which may be put in operation again after only a very short shut-down period.

.In accordance with another object of the invention the supporting shaft is provided with an axial bore which extends through the spring structure, the upper end of which terminates in the spherical supporting bearing, while the lower end of the bore terminates in at least one laterally outwardly leading side channel provided in the piston, whereby the lubricant used for the lubrication of the supporting bearing is supplied by said laterallyleading side channel of said piston. Heretofore, itwas customary to supply the lubricant to the supportinglbearing by longitudinal channels provided in the hollow cylindrical wall of the tubular shaft. The

lubricant. requirement in largegyratory crushers is so.

hig however, that the wall thickness of the tubular shaft is notsufficient for an adequate lubrication, so

that in orderto supply the necessary cross sections for the lubricant more than one longitudinal channel in the wall of the tubular shaft would be necessary. This how- 7 ever, is a very expensive manufacturing procedure and 2 particularly in crushers of large dimensions, the production of such channels is very difiicult, since inthe heretofore employed constructions for hydraulically adjustable gyratory crushersof the above mentioned type it was not possible to employ a different feeding for the lubricant to the supporting bearing for manufacturing reasons. The present invention however, now providesan arrangement which has a substantial ad,-

vantage, since the channel for the lubricant is arranged centrally in thesupport shaft, whereby owing to the large diameter of the spring structure, an axial bare with a sufficiently large cross sectional area can be used 'for supplying a sufficient amount of lubricant. In view of the foregoing,the result isa substantial simplification in the production and operation of a gyratory crusher constructed in accordance with the present invention. a 1

In another embodiment of the invention the piston of the piston-cylinder unit is provided above the piston seal and in the range of the ends of the side channels each with a lubricant pocket which extends in longitudinal direction of the piston, whereby to this lubricantpocket from the outside and through the cylinder wall a lubricant feed line is connected. In this manner the feed of the lubricant is made very advantageous directly to the central bore in the supporting shaft without influencing the adjustment of the crusher gap by means of the customary hydraulic piston.

In accordance with a further object of the invention the lower free end of the spring structure is supported by an upwardly open hollow pressure member and be-t tween the lower supporting surface of thispressure member and the supporting surface of thepiston of the piston-cylinder unit isarranged a spherical bearing. This construction assures in an advantageous manner, that in spite of the separate arrangement of the supporting shaft andthe piston-cylinder unit, any possible errors in the axial alinement of the supporting shaft and the piston cylinder-unit are automatically, compensated; I

The invention providesalsothat the hollow pressure member and thepiston, in the rangeof their engagement with each other, are surrounded by anannular space in which the feed line for the lubricant is discharged, whereby thisann ular space is connected with at least one passage in the hollow pressure member with theaxial bore in the supporting shaft. This arrangement assures, considering the structure, the manufacture and the saftey of the same, a substantially improved lubricant supply for the upper spherical supt porting bearing of the crusher cone.

According to a preferred construction of the crusher of the invention the piston-cylinder unit is so con- 7 structedthat above the piston seal of the piston and within the range of the discharge of one or more side channels an annular space is provided which is in communication with the lubricant feed line, In this manner the transfer of the lubricant from the feed line, which -isin communication withthe cylinderhousing, to the In accordance with another object of the invention, the annular space is produced by an annular groove in the outer circular surface of the piston. This has the advantage that the wall of the cylinder over its entire length may be made smooth so that during the assembly and also during disassembly, the piston for servicing operations does not cause damage to the sensitive high pressure seal as may be the case when axially extending grooves are provided in the upper portion of the wall of the cylinder in order to provide a locking means againt rotation of the piston relative to the cylinder.

According to another advantageous feature in the invention the piston in the range directly above the piston seal and the cylinder wall in its upper range are each provided with an annular groove, while the piston at least is provided with a lubricant pocket extending in axial direction and which connects both of the mentioned annular grooves with each other. This arrangement has the advantage that the axial extent of the annular spaces may be kept small so that the piston will have in the cylinder housing relatively long guiding surfaces.

' because it results in a substantial reduction in the entire height of the structure. Differentiating from an annular space which is formed by an annular groove in the piston body, this particular construction does not require that the dimensions of the groove in axial direction be considered when selecting the length of the cylindrical housing with respect to the uppermost and the lowermostpositions of the piston in the housing. An additional advantage is that the small diameter of the upper shaft portion at the same time provides an abutment for the piston so that it is impossible that during the hydraulic adjustment of the crusher cone the latter is raised beyond its highest permissible position. An advantage is that in this arrangement the end of the lubricant feed line may be placed at the upper end of the annular space so that one avoids with certainty that the high pressure seals which are under pressure may slide beyond this end of the lubricant feed line which could damage the seals.

According to another embodiment of the invention, one cylindrical sleeve is inserted into the cylindrical bore of the cylinder housing from above and another cylindrical sleeve from below, whereby the combined length of these two sleeves is less than the total length of the cylindrical bore, so that between the inner ends of these two cylindrical sleeves a suitable annular space is formed to which the feed line for the lubricant oil may be connected. This has the advantage that not only the piston, but also the cylindrical housing has a continuous, smooth surface and therefore these parts may be produced in a simple manner. The cylindrical sleeves form also at the same time in an advantageous manner, parts which are subject to wear and are therefore made of brass, bronze, or similar metals and can easily be replaced.

With these and other objects in view, the invention will now be described with reference to a few examples which are illustrated in the accompanying drawings and described in greater detail in the following specification.

In the drawing:

FIG. 1 illustrates a vertical sectional view of the gyratory crusher in accordance with the invention.

FIG. 2 illustrates in similar manner as in FIG. I, a modification of the gyratory crusher.

FIG. 3 illustrates in an enlarged view a vertical sectional view of a piston-cylinder unit in accordance with the invention.

FIG. 4 illustrates another modification of a pistoncylinder unit and particularly a piston with a shaft extension, and

FIG. 5 illustrates a modified piston-cylinder unit in which the annular lubricant containing space is formed between two cylindrical sleeves.

Referring to FIG. 1, the illustrated gyratory crusher has mounted in its casing l a vertical stationary tubular shaft 2 on the outer surface of which is rotatably mounted an eccentric sleeve 3, the lower end of which has rotatably mounted an eccentric sleeve 3, the lower end of which has secured thereto a gear wheel 4. This gear wheel 4 and therewith the sleeve 3 is driven by a beveled gear 5 fixedly attached to a horizontal drive shaft. The crusher cone 6, which on its upper face carries a part subject to wear, namely, a crusher cone liner 7, is rotatably mounted on the outer circumference of the eccentric sleeve 3 and in order to prevent a soiling of the bearing surfaces by the crushed material, the lower face of the crusher cone is provided with a lubricant filled labyrinth sealing device 8. The crusher cone 6 is supported in axial direction by a spherical supporting bearing 9 mounted on the upper end of a supporting shaft 10 which latter is axially slidably mounted in the bore of the tubular shaft 2. In order to prevent a rotation of the crusher cone when idle, it is connected by a torsion rod 29, which is provided with free wheeling, with the stationary supporting shaft 10.

In order to prevent a rotation of the supporting shaft 10, it is connected by a slidable key 38 with a corresponding axial groove in the bore of the tubular shaft 2. At the end of the supporting shaft 10 which faces away from the spherical supporting bearing 9, is ar ranged a biased spring structure 11 comprised preferably of a pre-tensioned stack of annular springs which are carried by an extension 12 of the supporting shaft 10 and which, by a tensioning nut 13 at the lower end of the extension 12, is put under compression.

The lower end of the spring structure 11 which with reference to the supporting shaft 10 is axially slidable,-

rests upon the upper end of a cup-shaped cylindrical pressure member .14 which is longitudinally slidable in the lower end of the bore of the tubular shaft 2.

The adjustment of the width S of the crusher gap in the upper end of the crusher is accomplished by a separate piston- cylinder unit 15, 16. The piston 16 engages loosely the bottom of the cup-shaped pressure member 14. The upper face of the piston 16 has the shape of a spherical segment which is engaged by a correspondingly shaped annular member 17. The supporting surface of the cup-shaped pressure member 14 engages with its plane bottom face the upper plane surface of the annular member 17. This has the result that any alinement errors along the axis of the supporting shaft and the axis of the piston are automatically compensated.

In order to supply the supporting bearing 9 effeciently with a lubricant the supporting shaft 10 and its extension 12 are provided along their entire length with .ja single centrally arranged longitudinal bore 18, the

ior of the cup 14 and with the central bore 19 in the bottom wall of the cup-shaped pressure member 14 and into a central bore 20 in the upper part of the piston 16.

The central bore 20 terminates above the seals 21 of v e the piston 16 in a side channel 22 which extends into a lubricant pocket 23 extending in longitudinal direction ofthe piston 16.A lubricant feed line 24 extends through the wall ofthe cylinder 15 and is in cornmuni' cation with the just mentioned lubricant pocket 23. In

this manner, even when the piston is adjusted vertically for the purpose of. adjusting the width of the crusher gap is still possible that the lubricant from the feed line24 may enter the central bore 18 and may be conducted to the spherical supportingbearing 9. The central bore 18do es notimpair the strengthof the individual elements, infact one may choose relatively large cross sections for this lubricant supply system, even in largertypesof gyratory crushers it is possible to make provision for a sufficient supply of Iubricant'to the supporting bearing. Compared with known structures of this type with hydraulic adjustment of the crusher cone the lubrication system of the invention constitutes an improvement characterized by its simplicity.

For determining the communication point of the lubricant pocket as formed; by the piston 16 with reference to the cylinder 15, it isadvisable to provide means for preventinga rotation of the piston relative to the wander. In accordance with the invention this is done in that the upper part of the piston 16 is provided with an axial groove 25 (FIG. I) which is slidably engaged .by a key 26 orthe like, fixedly attached in the adjacent wall of the cylinder 15.

. For protecting theengaging parts between the piston and the spring member against wear, namely the parts 14 and the annular member 17, it is advisable when at:-

cording to the invention, the supporting shaft 10 is provided at its upper end disposed in the tubular shaft, with a key 38 which slidably engages an axial groove in the bore of the tubularshaft 2 sothat the supporting shaft10 cannot rotate (FIG. 1).

In the gyratory crusher of the invention the lubrication takes place in the following manner: The oil entering through the feed line 24 is conducted under pressure to the axial channel 18 to the supporting bearing 9, The oil leaves this supporting bearing laterally and then flows over the bearing faces between the crusher cone 6 and the eccentruc sleeve 3 and between the eccentric sleeveand the tubular shaft 2 downwardly, and is so conducted that the oil which flows downwardly I flows also over the meshing teeth of the gear wheel 4 and the gear 5, and in this manner lubricates this gearing 4, 5. Finally, the discharge line 27 draws the lubri-I cation from the gyratory crusher and after this lubricant oil has been cleaned and cooled it is again introduced bya purnp into the feed line 24 and into the crusher.

In accordance with the modification illustrated in FIG. 2 the cup-shaped pressure member and the piston 16 aresurrounded in the range in which they are in engagenrentwith each other by an annular space 30 which is formed by a suitably constructed housing 33 which is sealingly attached to the lower side of the main housing 1.1 This annular space 30 is in eonnunieation with the Iubrican t feed line 24 coming from the exterior of the crusher. The cup-shaped pressure member is :conducts the lubricantto the spherical supporting bearing 9.

In small gyratory crushers, it is sufficient to employ the lubricant which leaves the spherical bearing 9 .for

also lubricating the bearing face of the eccentric sleeve 3 on the tubular shaft 2 and the bearing facebetween the eccentric sleeve and the crusher cone 6. This isaccornplished in a manneras described in the foregoing, by the .lubricantwhich leaves thespherical bearing 9 and flows downwardly between these mentioned bearing surfaees. v i

In larger gyratory crushersit is however, of advantage when the bearing faces of the eccentric sleeve 3 on the tubular shaft 2 are provided with theirown lubricant supply arrangement. For this purpose the hub 37 of the crusher casing 1 in which the tubular shaft 2 is secured, is provided with an annular groove 36.which,

. together with the tubular shaft 2 forms a corresponding annular space. This annular space is brought in cornmunieation with the lubricant supplyline 34. In the wall of the tubular shaft 2 is provided at least one lengthwise extending channel 40, which on one hand is connected by a transverse bore with the annular space is in communication with a lubricant oil feed line 24 e coming from the exterior of the crusher. The piston 16 is provided at its lower end with an annular groove 41 which is in communication with a transverse passage 22 in this piston. The annular groove 42 in the cylinder housing 15 and the annular groove 41 in the piston 16 are connected with each other by atleast one, but preferablyby rnore, lubricant pockets 23 which are uniforrnly distributed around the circumference of the piston, so that when this'piston is vertically adjusted the passage of the lubricant from the feed line 24 into the central bore 20 of the piston and toward the spherical bearing is assured.

In the embodiment of the lubrication system of the invention illustrated in FIG. 4, the vertically adjustable piston 16' is so constructed thata short distance above its lower piston seal 21, the piston 16 continues in the form of a shaft 31 having a reduced diameter; This shaft 31 extends through a suitably sealed bore at the upper end of the cylinder housing. A transverse channel 22 in the piston is in communication with a central bore 20 in the piston and is also connected with an annular space formed between the shaft 31and inner wall of the cylinder. The lubricant supply line 24 which, for the purpose of abetter accessibility, is connected to the 7 lower end of the cylinder, is in communication with a suitable longitudinal channel 43 in the wall of the cylinder and by means of an additional transverse channel '44 in the upper range of the cylinder housing is connected with an annular space formed between the shaft 31 and the wall of the cylinder. This construction may be made with a substantial reduction in the vertical dimension.

The embodiment of the invention illustrated in FIG. shows that the above mentioned annular'space may also be produced in that both ends of the bore of the cylinder housing have inserted therein cylindrical sleeves 44 and 46, respectively. These two cylinders have such an axial length that between the oppositely disposed inner ends of these two sleeves an annular space if formed in which the supply line 24 for the lubricant terminates. In this construction, the piston 16 is also provided with a radial transverse channel 22 which is in communication with a lubricant pocket 23 in the outer face of the piston and which is so dimensioned that in each adjusted height of the pistons a continuous communication between the annular space and the transverse channel 22 is maintained.

in this modification the structure illustrated in FIG.

3 may be employed which means that the piston at its lower end may be provided with an annular groove which is in communication with the transverse channel 22 whereby the annular groove in the piston and the annular space between the two cylindrical sleeves is connected with at least one lubricant pocket 23 arranged on the outside of the piston.

in all of the above described and illustrated embodiments of the invention the hydraulic liquid is supplied to the gyratory crusher by a supply line 28, which either is connected centrally to the bottom or laterally to the lower end of the cylinder. This is of particular importance when, according to FIG. 5, a probe 47 is employed for measuring and recording the adjusted position of the piston in the cylinder so that one is able to determine the particular position of the crusher cone.

What we claim is:

l. A gyratory crusher comprising a. a housing having a top inlet for material to be crushed and a bottom outlet for crushed material,

b. a tubular shaft fixedly mounted in a vertical position in said housing,

c. a support shaft mounted in said tubular shaft for slidable movement longitudinally thereof and provided with a longitudinal bore therethrough,

d. a first spherical bearing member mounted on the top end of said support shaft,

e. a crusher cone for cooperation with an interior crusher lining in said housing, said crusher cone including a second spherical bearing member conforming to and in slidable engagement with said first spherical bearing member, and said crusher cone further including a cylindrical sleeve extending downwardly therefrom,

. an eccentric sleeve in rotatable engagement with the outer surface of said tubular shaft and with the inner surface of said sleeve on the crusher cone,

g. drive means mounted in said housing and operatively connected with said eccentric sleeve for rotating the same,

h. biased overload protection spring means in engagement with the bottom end of said support shaft within said tubular shaft and provided with a longitudinal bore therethrough in communication with said bore through the support shaft,

. a cup-shaped cylindrical member slidably mounted in said tubular shaft in'engagement with the bottom end of said spring means,

j. means for supplying lubricant to the interior of said cup-shaped member from an exterior source,

k. a bottom extension member secured to said housing and including a cylindrical portion in longitudinal alignment with said tubular shaft,

1. a piston slidably mounted in said cylindrical housing portion and having a spherical bearing surface at its top end, a

m. a disc member in engagement with the bottom end of said cup-shaped member and having a spherical bottom bearing surface conforming to and in engagement with said spherical bearing surface at the top of the piston, whereby to compensate for any axial misalignment between said piston and said cup-shaped member, and

n. means for supplying hydraulic fluid to the space between the bottom of said extension member and the bottom end of said piston for axial adjustment of said support shaft and thereby adjustment of the width of the crusher gap.

2. The gyratory crusher according to claim I, in which said bottom extension member of the housing constitutes a lubricant chamber around said disc member and adjacent portions of the cup-shaped member and piston, and including conduit means connecting the interior of said lubricant chamber with said exterior source of lubricant.

3. The gyratory crusher according to claim 2, including two cylindrical sleeves in said cylindrical portion of the housing extension member, said sleeves extending inwardly into said cylindrical portion one'from each end thereof and providing between their inner ends a space in communication with said exterior lubricant source and with a recess in the cylindrical surface of said piston, and conduit means connecting said recess with the interior of said cup-shaped member and with said lubricant chamber.

4. The gyratory crusher according to claim 1, including an annulargroove in said cylindrical portion of the housing extension, an annular groove in the outer surface of said piston, a vertical recess in the piston interconnecting said two annular grooves in all axial positions of the piston, means providing communication between said annular groove in said cylindrical portion and said exterior lubricant source, and conduit means connecting said annular groove in the piston with the interior of said cup-shaped member.

5. The gyratory crusher according to claim 1, in which said piston has an upper portion of reduced diameter which extends upwardly through a top opening of said cylindrical housing portion of correspondingly reduced diameter, and including sealing means for the piston in said reduced diameter opening whereby a sealed annular space is formed below said sealing means, conduit means in said piston, disc member and cup-shaped member connecting said annular space with the interior of said cup-shaped member, and passage means connecting said annular space with said exterior lubricant source.

* k a: s

Claims (5)

1. A gyratory crusher comprising a. a housing having a top inlet for material to be crushed and a bottom outlet for crushed material, b. a tubular shaft fixedly mounted in a vertical position in said housing, c. a support shaft mounted in said tubular shaft for slidable movement longitudinally thereof and provided with a longitudinal bore therethrough, d. a first spherical bearing member mounted on the top end of said support shaft, e. a crusher cone for cooperation with an interior crusher lining in said housing, said crusher cone including a second spherical bearing member conforming to and in slidable engagement with said first spherical bearing member, and said crusher cone further including a cylindrical sleeve extending downwardly therefrom, f. an eccentric sleeve in rotatable engagement with the outer surface of said tubular shaft and with the inner surface of said sleeve on the crusher cone, g. drive means mounted in said housing and operatively connected with said eccentric sleeve for rotating the same, h. biased overload protection spring means in engagement with the bottom end of said support shaft within said tubular shaft and provided with a longitudinal bore therethrough in communication with said bore through the support shaft, i. a cup-shaped cylindrical member slidably mounted in said tubular shaft in engagement with the bottom end of said spring means, j. means for supplying lubricant to the interior of said cupshaped member from an exterior source, k. a bottom extension member secured to said housing and including a cylindrical portion in longitudinal alignment with said tubular shaft, l. a piston slidably mounted in said cylindrical housing portion and having a spherical bearing surface at its top end, m. a disc member in engagement with the bottom end of said cupshaped member and having a spherical bottom bearing surface conforming to and in engagement with said spherical bearing surface at the top of the piston, whereby to compensate for any axial misalignment between said piston and said cup-shaped member, and n. means for supplying hydraulic fluid to the space between the bottom of said extension member and the bottom end of said piston for axial adjustment of said support shaft and thereby adjustment of the width of the crusher gap.

2. The gyratory crusher according to claim 1, in which said bottom extension member of the housing constitutes a lubricant chamber around said disc member and adjacent portions of the cup-shaped member and piston, and including conduit means connecting the interior of said lubricant chamber with said exterior source of lubricant.

3. The gyratory crusher according to claim 2, including two cylindrical sleeves in said cylindrical portion of the housing extension member, said sleeves extending inwardly into said cylindrical portion one from each end thereof and providing between their inner ends a space in communication with said exterior lubricant source and with a recess in the cylindrical surface of said piston, and conduit means connecting said recess with the interior of said cup-shaped member and with said lubricant chamber.

4. The gyratory crusher according to claim 1, including an annular groove in said cylindrical portion of the housing extension, an annular groove in the outer surface of said piston, a vertical recess in the piston interconnecting said two annular grooves in all Axial positions of the piston, means providing communication between said annular groove in said cylindrical portion and said exterior lubricant source, and conduit means connecting said annular groove in the piston with the interior of said cup-shaped member.

5. The gyratory crusher according to claim 1, in which said piston has an upper portion of reduced diameter which extends upwardly through a top opening of said cylindrical housing portion of correspondingly reduced diameter, and including sealing means for the piston in said reduced diameter opening whereby a sealed annular space is formed below said sealing means, conduit means in said piston, disc member and cup-shaped member connecting said annular space with the interior of said cup-shaped member, and passage means connecting said annular space with said exterior lubricant source.

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