US3908480A - Interlocking knuckle assembly - Google Patents

Interlocking knuckle assembly Download PDF

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Publication number
US3908480A
US3908480A US440297A US44029774A US3908480A US 3908480 A US3908480 A US 3908480A US 440297 A US440297 A US 440297A US 44029774 A US44029774 A US 44029774A US 3908480 A US3908480 A US 3908480A
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Prior art keywords
spindle
casting
knuckle
forging
assembly
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Expired - Lifetime
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US440297A
Inventor
Carlos P Afanador
Richard G Tschabrun
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Dayton Walther Corp
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Dayton Walther Corp
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Priority to US440297A priority Critical patent/US3908480A/en
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Publication of US3908480A publication Critical patent/US3908480A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/18—Steering knuckles; King pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/50—Constructional features of wheel supports or knuckles, e.g. steering knuckles, spindle attachments
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20396—Hand operated
    • Y10T74/20474—Rotatable rod, shaft, or post
    • Y10T74/20516—Mountings

Definitions

  • ABSTRACT An interlocking knuckle assembly consisting of an integral spindle and lower knuckle boss and an integral casting, including an upper knuckle boss and a spindle receiving opening in which the spindle of the forging is received.
  • the casting is provided with a V-shaped groove formed therein opening toward the spindle receiving opening, and an upwardly projecting rib on the forging engages the groove on the casting when the spindle is fixed within the spindle receiving opening to prevent rotational movement of the spindle within the casting.
  • FIG-1 INTERLOCKING KNUCKLE ASSEMBLY CROSS REFERENCE TO RELATED APPLICATION
  • a two-piece knuckle assembly which includes an integral casting having an upper knuckle boss and a spindle opening and an integral forging having a spindle shaft and a lower knuckle boss.
  • the components are as Sild preferably by shrink fitting the spindle of the forging in the spindle opening of the casting.
  • an interlocked knuckle assembly in which relative rotational movement between the basic components is eliminated or at least reduced to acceptable limits by providing a mechanical interlock between the casting and the forging.
  • the casting is provided with a substantially V-shaped member having diverging legs opening toward the spindle receiving opening in the casting.
  • a flange portion of the forging is provided with an upwardly extending rib which, when the spindle is shrink fitted in the opening in the casting, is received in the groove defined by the diverging legs of the V- shaped member.
  • FIG. 1 is a side view of a knuckle assembly in accordance with the present invention
  • FIG. 2 is an end view of the knuckle assembly with parts in section
  • FIG. 3 is an exploded perspective view of a portion of the knuckle assembly.
  • the knuckle assembly of the present invention consists essentially of two components, an integrally formed casting l2 and an integrally formed forging 14.
  • the casting 12 is provided with an upper knuckle boss 16'projecting outwardly thereof and having a ball joint opening 18 formed therethrough.
  • a spindle receiving opening 20 is machined through the casting such that its axis is angularly disposed in intersecting relationship to the axis of the opening 18.
  • the casting 12 may also include upper and lower brake rails 22 and 24, a steering arm'26 having an opening 28 threthrough, dust shield mounting bosses 30, a grease seal boss 32, and a tapped hole 34 for receiving a steering mount stop.
  • the forging 14 is constructed as an integral forging including a tempered and case hardened spindle shaft 36 and a'flan'ge portion 37 intermediate the spindle shaft and a lower knuckle boss 38.
  • the spindle shaft itself includes a shrink fit portion 40, an inside bearing section 42,-afrustoconical section 44, an outside bearing section 46, and a threaded outer end 48 provided with' a cotter pin opening therethrough (not shown).
  • the lower knuckle boss 38 projects outwardly from the flange portion 37 of the forging 14 with the opening 50 therethrough disposed oppositely to the opening 18 in the upper knuckle boss 16 when the shrink fitted section 40 of the spindle shaft 36 is received in the spindle receiving opening 20 and fixed therein, preferably by means of a shrink fitting so that the walls of the spindle receiving opening grip the section 40 of the spindle shaft.
  • a substantially V-shaped member 52 Projecting outwardly from the casting 12 is a substantially V-shaped member 52 having a pair of diverging legs 54 opening downwardly toward the spindle receiving opening 20.
  • the flange portion 37 of the forging 14 is provided with an upwardly projecting rib 56 receivable in the groove 58 defined by the legs 54 when the spindle shaft is shrink fitted in position in the casting 12, as seen in FIGS. 1 and 2 of the drawings.
  • the forging 14 may be fixed to the casting 12 by induction heating the area of the casting 12 about the spindle opening 20, the forging 14 inserted in the spindle receiving opening as indicated by the arrow in FIG. 3 of the drawings, and the assembly then quenched to provide a shrink fit.
  • the rib 56 and/or the groove 58 may be machined, in most instances it will be satisfactory to allow a slight amount of clearance between the rib 56 and the groove 58, since any relative rotation permitted by these clearances is of a small enough magnitude to be acceptable, while the manufacturing costs are appreciably diminished by eliminating a separate machining step for the rib and groove 56, 58.
  • the present invention provides an interlocking knuckle assembly which I prevents misalignment of the upper and lower knuckles with and projecting from said casting, means defining a spindle receiving opening formed through said casting in spaced relationship to said first knuckle, an integral forging consisting of a spindle shaft and a second knuckle boss formed integrally with said spindle shaft, and wherein said spindle shaft is received in said spindle receiving opening and fixed therein with the wall of said opening engaging a section of said spindle shaft and said second knuckle boss is positioned in opposition to said first knuckle boss, improved means for preventing rotational movement of said spindle shaft within said opening and misalignment of said first and second knuckle bosses with respect to each other comprising:
  • said second interlocking means being formed on a surface of said forging other than said section thereof engaged by said wall of said opening, and
  • said first and second interlocking means being in engagement with each other outwardly of said spindle receiving opening with said first and second knuckle bosses positioned in opposition to each other.
  • interlocking means on said casting and said forging comprises:
  • said substantially V-shaped member is formed on said casting.
  • said groove is slightly larger than said rib.
  • said interlocking means is formed on said casting adjacent said spindle receiving opening and on said forging adjacent second said knuckle boss thereof.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

An interlocking knuckle assembly consisting of an integral spindle and lower knuckle boss and an integral casting, including an upper knuckle boss and a spindle receiving opening in which the spindle of the forging is received. The casting is provided with a V-shaped groove formed therein opening toward the spindle receiving opening, and an upwardly projecting rib on the forging engages the groove on the casting when the spindle is fixed within the spindle receiving opening to prevent rotational movement of the spindle within the casting.

Description

United States Patent [191 Afanador et al.
1 1 Sept. 30, 1975 INTERLOCKING KNUCKLE ASSEMBLY lnventors: Carlos P. Afanador, Centerville;
Richard G. Tschabrun, Dayton, both of Ohio Dayton-Walther Corporation, Dayton, Ohio Filed: Feb. 7, 1974 Appl. No.: 440,297
Related [1.8. Application Data Continuation-impart of Ser. No. 297,222. Oct. 13, 1970. Pat. No. 3,801,124.
Assignee:
[1.8. CI. 74/511; 280/96.1 Int. Cl. G05g l/08 Field of Search 74/511, 483; 403/13. 14;
References Cited UNITED STATES PATENTS 7/1934 Bijur 280/96.1
2,499,683 3/1950 Reyes 403/14 FOREIGN PATENTS OR APPLICATIONS 1,203,245 4/1968 United Kingdom 403/13 Primary Examiner-Samuel Scott Assistant Examiner-Jr. Ratliff Attorney, Agent, or FirmBiebel, French 81. Bugg [57] ABSTRACT An interlocking knuckle assembly consisting of an integral spindle and lower knuckle boss and an integral casting, including an upper knuckle boss and a spindle receiving opening in which the spindle of the forging is received. The casting is provided with a V-shaped groove formed therein opening toward the spindle receiving opening, and an upwardly projecting rib on the forging engages the groove on the casting when the spindle is fixed within the spindle receiving opening to prevent rotational movement of the spindle within the casting.
6 Claims, 3 Drawing Figures 32' 5e 46 as 56 l 48 44 II 14 4o I US. Patent FIG-1 INTERLOCKING KNUCKLE ASSEMBLY CROSS REFERENCE TO RELATED APPLICATION In the above noted related application, a two-piece knuckle assembly is described which includes an integral casting having an upper knuckle boss and a spindle opening and an integral forging having a spindle shaft and a lower knuckle boss. The components are as sembled preferably by shrink fitting the spindle of the forging in the spindle opening of the casting.
While this assembly provides several advantages over conventional bolted assemblies and those in which both knuckles are formed on a single casting, there exists a possibility that the spindle, under certain stress conditions may rotate within the spindle receiving opening.
Since the lower knuckle boss is formed integrally with the'spindle, rotation of the spindle of course may result in misalignment of the upper and lower knuckle bosses. Additionally, while it would be difficult if not impossible under normal operating conditions to disengage the spindle from the opening in which it is shrink fitted by a force applied axially of the spindle, disengagement by rotational movement may result where an overload amount is applied to the spindle.
SUMMARY OF THE INVENTION In accordance with the present invention an interlocked knuckle assembly is provided in which relative rotational movement between the basic components is eliminated or at least reduced to acceptable limits by providing a mechanical interlock between the casting and the forging.
Specifically, the casting is provided with a substantially V-shaped member having diverging legs opening toward the spindle receiving opening in the casting.
A flange portion of the forging is provided with an upwardly extending rib which, when the spindle is shrink fitted in the opening in the casting, is received in the groove defined by the diverging legs of the V- shaped member.
While the groove defined by the legs of the V-shaped member and/or the rib on the flange portion of the forging may be machined to provide a precise fit between these two members, it will generally be sufficient for purposes of the present invention to form these members without additional machining, since the small amount of relative rotation that may result by virtue of eliminating the machining operation will not appreciably affect the operation of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a knuckle assembly in accordance with the present invention;
FIG. 2 is an end view of the knuckle assembly with parts in section; and
FIG. 3 is an exploded perspective view of a portion of the knuckle assembly.
DESCRIPTION OF THE PREFERRED EMBODIMENT The knuckle assembly of the present invention consists essentially of two components, an integrally formed casting l2 and an integrally formed forging 14. The casting 12 is provided with an upper knuckle boss 16'projecting outwardly thereof and having a ball joint opening 18 formed therethrough. A spindle receiving opening 20 is machined through the casting such that its axis is angularly disposed in intersecting relationship to the axis of the opening 18.
As in thecase of the assembly described in the above noted related application, the casting 12 may also include upper and lower brake rails 22 and 24, a steering arm'26 having an opening 28 threthrough, dust shield mounting bosses 30, a grease seal boss 32, and a tapped hole 34 for receiving a steering mount stop.
The forging 14 is constructed as an integral forging including a tempered and case hardened spindle shaft 36 and a'flan'ge portion 37 intermediate the spindle shaft and a lower knuckle boss 38. The spindle shaft itself includes a shrink fit portion 40, an inside bearing section 42,-afrustoconical section 44, an outside bearing section 46, and a threaded outer end 48 provided with' a cotter pin opening therethrough (not shown).
5 The lower knuckle boss 38 projects outwardly from the flange portion 37 of the forging 14 with the opening 50 therethrough disposed oppositely to the opening 18 in the upper knuckle boss 16 when the shrink fitted section 40 of the spindle shaft 36 is received in the spindle receiving opening 20 and fixed therein, preferably by means of a shrink fitting so that the walls of the spindle receiving opening grip the section 40 of the spindle shaft.
Projecting outwardly from the casting 12 is a substantially V-shaped member 52 having a pair of diverging legs 54 opening downwardly toward the spindle receiving opening 20. The flange portion 37 of the forging 14 is provided with an upwardly projecting rib 56 receivable in the groove 58 defined by the legs 54 when the spindle shaft is shrink fitted in position in the casting 12, as seen in FIGS. 1 and 2 of the drawings.
As will be apparent to those skilled in the art, the forging 14 may be fixed to the casting 12 by induction heating the area of the casting 12 about the spindle opening 20, the forging 14 inserted in the spindle receiving opening as indicated by the arrow in FIG. 3 of the drawings, and the assembly then quenched to provide a shrink fit.
While, if an exact fit is desired between the upstanding rib 56 and the groove 58, the rib 56 and/or the groove 58 may be machined, in most instances it will be satisfactory to allow a slight amount of clearance between the rib 56 and the groove 58, since any relative rotation permitted by these clearances is of a small enough magnitude to be acceptable, while the manufacturing costs are appreciably diminished by eliminating a separate machining step for the rib and groove 56, 58.
From the above it will be seen that the present invention provides an interlocking knuckle assembly which I prevents misalignment of the upper and lower knuckles with and projecting from said casting, means defining a spindle receiving opening formed through said casting in spaced relationship to said first knuckle, an integral forging consisting of a spindle shaft and a second knuckle boss formed integrally with said spindle shaft, and wherein said spindle shaft is received in said spindle receiving opening and fixed therein with the wall of said opening engaging a section of said spindle shaft and said second knuckle boss is positioned in opposition to said first knuckle boss, improved means for preventing rotational movement of said spindle shaft within said opening and misalignment of said first and second knuckle bosses with respect to each other comprising:
a. first interlocking means formed integrally with said casting outwardly of said spindle receiving opening therein,
b. second interlocking means complementary to said first interlocking means and formed integrally with said forging,
c. said second interlocking means being formed on a surface of said forging other than said section thereof engaged by said wall of said opening, and
d. said first and second interlocking means being in engagement with each other outwardly of said spindle receiving opening with said first and second knuckle bosses positioned in opposition to each other.
2. The assembly of claim 1 wherein the interlocking means on said casting and said forging comprises:
a. interlocking rib and groove means.
3. The assembly of claim 2 wherein said interlocking rib and groove means comprises:
a. a substantially V-shaped member having diverging legs defining said groove therebetween.
4. The assembly of claim 3 wherein:
a. said substantially V-shaped member is formed on said casting.
5. The assembly of claim 2 wherein:
a. said groove is slightly larger than said rib.
6. The assembly of claim 1 wherein:
a. said interlocking means is formed on said casting adjacent said spindle receiving opening and on said forging adjacent second said knuckle boss thereof.

Claims (6)

1. In a knuckle assembly including an integrally formed casting, a first knuckle boss formed integrally with and projecting from said casting, means defining a spindle receiving opening formed through said casting in spaced relationship to said first knuckle, an integral forging consisting of a spindle shaft and a second knuckle boss formed integrally with said spindle shaft, and wherein said spindle shaft is received in said spindle receiving opening and fixed therein with the wall of said opening engaging a section of said spindle shaft and said second kNuckle boss is positioned in opposition to said first knuckle boss, improved means for preventing rotational movement of said spindle shaft within said opening and misalignment of said first and second knuckle bosses with respect to each other comprising: a. first interlocking means formed integrally with said casting outwardly of said spindle receiving opening therein, b. second interlocking means complementary to said first interlocking means and formed integrally with said forging, c. said second interlocking means being formed on a surface of said forging other than said section thereof engaged by said wall of said opening, and d. said first and second interlocking means being in engagement with each other outwardly of said spindle receiving opening with said first and second knuckle bosses positioned in opposition to each other.
2. The assembly of claim 1 wherein the interlocking means on said casting and said forging comprises: a. interlocking rib and groove means.
3. The assembly of claim 2 wherein said interlocking rib and groove means comprises: a. a substantially V-shaped member having diverging legs defining said groove therebetween.
4. The assembly of claim 3 wherein: a. said substantially V-shaped member is formed on said casting.
5. The assembly of claim 2 wherein: a. said groove is slightly larger than said rib.
6. The assembly of claim 1 wherein: a. said interlocking means is formed on said casting adjacent said spindle receiving opening and on said forging adjacent second said knuckle boss thereof.
US440297A 1970-10-13 1974-02-07 Interlocking knuckle assembly Expired - Lifetime US3908480A (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4223903A (en) * 1978-05-09 1980-09-23 The Bendix Corporation Integral suspension member
US4500111A (en) * 1980-12-18 1985-02-19 The Bendix Corporation Suspension assembly for a wheel and brake
US5199730A (en) * 1991-08-14 1993-04-06 Westfall Rodney D Spindle assembly for extending the turning angle of a motor vehicle and reducing tire wear
US5219176A (en) * 1989-11-02 1993-06-15 James Mitchell One-piece steering knuckle assembly
US5366233A (en) * 1992-05-18 1994-11-22 The Budd Company Wire form steering arm link
US5785332A (en) * 1996-08-01 1998-07-28 Dana Corporation Motor vehicle steering knuckle assembly
US6398240B1 (en) * 1999-10-29 2002-06-04 Belltech, Inc. Vehicle-lowering steering knuckle for “live” wheel hub
US6419250B1 (en) * 1998-05-28 2002-07-16 Dana Corporation One-piece forged steering knuckle assembly
US6565159B1 (en) 2001-10-25 2003-05-20 Hayes Lemmerz International, Inc. Aluminum wheel carrier and spindle assembly
US6641229B1 (en) 2001-10-25 2003-11-04 Hayes Lemmerz International, Inc. Spindle mounting for aluminum wheel carrier
US20040108675A1 (en) * 2002-12-06 2004-06-10 Visteon Global Technologies, Inc. Lightweight knuckle with in-cast spindle
US7185901B1 (en) * 2004-08-30 2007-03-06 Stimely Steven J Golf cart spindle
US20090091098A1 (en) * 2007-10-05 2009-04-09 Axletech International Ip Holdings, Llc Wheel assembly
US20100038873A1 (en) * 2008-08-14 2010-02-18 Stoyan Stoychey Steering knuckle with spindle and method of making same
US20140027994A1 (en) * 2012-07-30 2014-01-30 Arvinmeritor Technology, Llc Steering Knuckle Assembly with Snap Ring Spindle Retention and a Method of Manufacture
US8714572B1 (en) 2012-12-18 2014-05-06 Textron Inc. System and method to lower axle/spindles for golf cars, personal transportation vehicles and low speed vehicles
US8777241B1 (en) * 2013-03-08 2014-07-15 Ford Global Technologies, Llc Suspension component with tapered spindle joint
US20160264175A1 (en) * 2015-03-12 2016-09-15 Nissin Kogyo Co., Ltd. Vehicle support structure
WO2018029713A2 (en) 2016-08-12 2018-02-15 Bharat Forge Limited Steering knuckle and its manufacturing
US20180265126A1 (en) * 2017-03-15 2018-09-20 Hyundai Motor Company Knuckle apparatus for vehicle suspension system
US20180370565A1 (en) * 2017-06-21 2018-12-27 Hendrickson Usa, L.L.C. Self-steering axle knuckle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1968022A (en) * 1925-09-17 1934-07-31 Auto Research Corp Lubrication
US2499683A (en) * 1945-03-16 1950-03-07 Felix J Reyes Corner joint

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1968022A (en) * 1925-09-17 1934-07-31 Auto Research Corp Lubrication
US2499683A (en) * 1945-03-16 1950-03-07 Felix J Reyes Corner joint

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4223903A (en) * 1978-05-09 1980-09-23 The Bendix Corporation Integral suspension member
US4500111A (en) * 1980-12-18 1985-02-19 The Bendix Corporation Suspension assembly for a wheel and brake
US5219176A (en) * 1989-11-02 1993-06-15 James Mitchell One-piece steering knuckle assembly
US5199730A (en) * 1991-08-14 1993-04-06 Westfall Rodney D Spindle assembly for extending the turning angle of a motor vehicle and reducing tire wear
US5366233A (en) * 1992-05-18 1994-11-22 The Budd Company Wire form steering arm link
US5785332A (en) * 1996-08-01 1998-07-28 Dana Corporation Motor vehicle steering knuckle assembly
US6419250B1 (en) * 1998-05-28 2002-07-16 Dana Corporation One-piece forged steering knuckle assembly
US6398240B1 (en) * 1999-10-29 2002-06-04 Belltech, Inc. Vehicle-lowering steering knuckle for “live” wheel hub
US6565159B1 (en) 2001-10-25 2003-05-20 Hayes Lemmerz International, Inc. Aluminum wheel carrier and spindle assembly
US6641229B1 (en) 2001-10-25 2003-11-04 Hayes Lemmerz International, Inc. Spindle mounting for aluminum wheel carrier
US20040108675A1 (en) * 2002-12-06 2004-06-10 Visteon Global Technologies, Inc. Lightweight knuckle with in-cast spindle
US6916030B2 (en) * 2002-12-06 2005-07-12 Visteon Global Technologies, Inc. Lightweight knuckle with in-cast spindle
US7185901B1 (en) * 2004-08-30 2007-03-06 Stimely Steven J Golf cart spindle
US20090091098A1 (en) * 2007-10-05 2009-04-09 Axletech International Ip Holdings, Llc Wheel assembly
US20120235374A1 (en) * 2007-10-05 2012-09-20 Axletech International Ip Holdings, Llc Wheel Assembly
US7850179B2 (en) * 2007-10-05 2010-12-14 Axletech International Ip Holdings, Llc Wheel assembly
US20110227306A1 (en) * 2007-10-05 2011-09-22 Axletech International Ip Holdings, Llc Wheel Assembly
US8146931B2 (en) * 2007-10-05 2012-04-03 Axletech International Ip Holdings, Llc Wheel assembly
US20100038873A1 (en) * 2008-08-14 2010-02-18 Stoyan Stoychey Steering knuckle with spindle and method of making same
US20140027994A1 (en) * 2012-07-30 2014-01-30 Arvinmeritor Technology, Llc Steering Knuckle Assembly with Snap Ring Spindle Retention and a Method of Manufacture
US9096259B2 (en) * 2012-07-30 2015-08-04 Arvinmeritor Technology, Llc Steering knuckle assembly with snap ring spindle retention and a method of manufacture
US8714572B1 (en) 2012-12-18 2014-05-06 Textron Inc. System and method to lower axle/spindles for golf cars, personal transportation vehicles and low speed vehicles
US8777241B1 (en) * 2013-03-08 2014-07-15 Ford Global Technologies, Llc Suspension component with tapered spindle joint
US20160264175A1 (en) * 2015-03-12 2016-09-15 Nissin Kogyo Co., Ltd. Vehicle support structure
US9751559B2 (en) * 2015-03-12 2017-09-05 Nissin Kogyo Co., Ltd. Vehicle support structure
WO2018029713A2 (en) 2016-08-12 2018-02-15 Bharat Forge Limited Steering knuckle and its manufacturing
US20180265126A1 (en) * 2017-03-15 2018-09-20 Hyundai Motor Company Knuckle apparatus for vehicle suspension system
US10518805B2 (en) * 2017-03-15 2019-12-31 Hyundai Motor Company Knuckle apparatus for vehicle suspension system
US20180370565A1 (en) * 2017-06-21 2018-12-27 Hendrickson Usa, L.L.C. Self-steering axle knuckle
US10759475B2 (en) * 2017-06-21 2020-09-01 Hendrickson Usa, L.L.C. Self-steering axle knuckle

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