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WO2015178865A1 - Multi functional test device for leaf springs - Google Patents

Multi functional test device for leaf springs Download PDF

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Publication number
WO2015178865A1
WO2015178865A1 PCT/TR2015/000048 TR2015000048W WO2015178865A1 WO 2015178865 A1 WO2015178865 A1 WO 2015178865A1 TR 2015000048 W TR2015000048 W TR 2015000048W WO 2015178865 A1 WO2015178865 A1 WO 2015178865A1
Authority
WO
WIPO (PCT)
Prior art keywords
coupling
leaf spring
inner piston
piston
test device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/TR2015/000048
Other languages
French (fr)
Inventor
Cemal KOCHAN
Melih BELEVI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dokuz Eylul Universitesi Rektorlugu
Original Assignee
Dokuz Eylul Universitesi Rektorlugu
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dokuz Eylul Universitesi Rektorlugu filed Critical Dokuz Eylul Universitesi Rektorlugu
Publication of WO2015178865A1 publication Critical patent/WO2015178865A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G01M17/04—Suspension or damping

Definitions

  • the invention is related to a multi functional leaf spring test device which carries out both static and dynamic (usage life) tests of suspension elements which provide driving comfort and safety by means of storing the energy and then exposing said energy formed by the loads suddenly received at the chassis and drive trains of especially road vehicles and trains due to road conditions.
  • leaf springs are used in old vehicles, the rear suspension systems of commercial vehicles used for transporting freight and in the locomotives of rail vehicles.
  • the leaf springs which are used generally in vehicles that are subjected to industrial type heavy labour need to be checked in terms of their usage lives and their safety. Due to this, test studies have been carried out for many years by 15 leaf spring producing companies.
  • leaf springs are being tested in two ways. First of all the leaf springs are tested with one strain wherein the vehicle falls into a small pit and the strain on the leaf spring is measured, or secondly the strain on the leaf spring is tested when it is subjected to strain wherein the vehicle falls into a pit and then acceleration is carried out (slowing down or speeding up). Moreover nowadays, leaf spring producers and users aim to provide ergonomic design, with lower costs and higher quality.
  • test mechanism is a mass similar to a single pieced block found at the bottom wherein leaf springs are coupled on said block and a system that applies force to the cranks onto which the leaf springs have been coupled to.
  • the invention is related to a multi functional test device that enables to carry out tests under real strain conditions by applying (falling into a pit, acceleration, taking a curve) all kinds of strain forces that the leaf springs are subjected to during usage.
  • Figure-1 Front view of the multi functional test device for testing leaf springs
  • Figure-2 Left side view of the multi functional test device for testing leaf springs
  • FIG. 3 Isometric detail view of the leaf spring coupling mechanism
  • Figure-4 Isometric view of the multi functional test device for testing leaf springs
  • a multi functional test device for a leaf spring subject to the invention comprises;
  • the multi functional test device for leaf springs enables the movements of the leaf spring (30) such that they are similar to the strain conditions during real usage conditions.
  • the leaf spring (30) is fixed to the multi functional test device for testing leaf springs, from the centre with a two part system. Said two parted system is formed from a bottom coupling part (15) for leaf spring and a top coupling part (16) for leaf spring. Screws (17) and nuts (11) hold the two parted system together.
  • the top coupling part (16) for the leaf spring carries out the leaf spring (30) acceleration motion and the force application rod (18) carries out the falling into pit and taking the curve motions.
  • the coupling of the force application rod (18) with the leaf spring top coupling part (16) is performed with a screw (17) and nut (11).
  • the leaf spring (30) is connected via a pin (12), U screw (13) and nuts to the two eye connection apparatus (10) from its two eye sections (ends).
  • first outer pistons that can move independent from each other are present to carry out the three different strains that arise during the real usage of the leaf spring (30).
  • These are formed by two outer pistons, namely the first outer piston (21) and the second outer piston (22) and two inner pistons; namely the first inner piston (26) and the second inner piston (27).
  • the first outer piston (21) and the second outer piston (22) are coupled to the force application rod (18) by means of a ball bearing (19).
  • the ball bearing (19) has been mounted inside the outer piston front end coupling (20).
  • the first outer piston (21) and the second outer piston (22) both simultaneously move in the same direction (up and down) at the same distance thereby applying force onto the leaf spring (28) via the force application rod (18) in order to perform the "falling into the pit" action of the leaf spring.
  • the first outer piston (21) moves downward and the second outer piston (22) moves upward at an equal distance thereby applying a twisting moment onto the leaf spring (30) via the force application rod (18).
  • the strain of the leaf spring in the case that a vehicle accelerates is carried out by the first inner piston (26) and the second inner piston (27).
  • the first inner piston (26) applies force onto the leaf spring (30) via the leaf spring coupling top part (16) in order to create the negative acceleration (slowing down) motion.
  • the second inner piston (27) applies force onto the leaf spring (30) via the leaf spring top coupling part (16) in order to create the positive acceleration (speeding up) motion.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Springs (AREA)

Abstract

The invention is related to a multi functional test device that has been developed for leaf springs that are used in suspension systems of motor vehicles (construction equipment, trucks, pick-up trucks etc) which are subjected to heavy loads.

Description

MULTI FUNCTIONAL TEST DEVICE FOR LEAF SPRINGS
DESCRIPTION
Technical Field
The invention is related to a multi functional leaf spring test device which carries out both static and dynamic (usage life) tests of suspension elements which provide driving comfort and safety by means of storing the energy and then exposing said energy formed by the loads suddenly received at the chassis and drive trains of especially road vehicles and trains due to road conditions.
Background of the Invention (Prior Art)
It is known that leaf springs are used in old vehicles, the rear suspension systems of commercial vehicles used for transporting freight and in the locomotives of rail vehicles. The leaf springs which are used generally in vehicles that are subjected to industrial type heavy labour need to be checked in terms of their usage lives and their safety. Due to this, test studies have been carried out for many years by 15 leaf spring producing companies.
Nowadays, leaf springs are being tested in two ways. First of all the leaf springs are tested with one strain wherein the vehicle falls into a small pit and the strain on the leaf spring is measured, or secondly the strain on the leaf spring is tested when it is subjected to strain wherein the vehicle falls into a pit and then acceleration is carried out (slowing down or speeding up). Moreover nowadays, leaf spring producers and users aim to provide ergonomic design, with lower costs and higher quality.
According to the invention subject to the application numbered US 6199427 Bl belonging to the known state of the art, the testing methods of leaf springs are explained. According to this invention the test mechanism is a mass similar to a single pieced block found at the bottom wherein leaf springs are coupled on said block and a system that applies force to the cranks onto which the leaf springs have been coupled to.
l According to this system the application of force (strain) is carried out with either one force or two forces. However the leaf springs on the vehicles are subjected to three different forces during usage. The first one of these forces is the force which tries to bend the leaf spring when the vehicle falls into the pit, and the second is the force that tries to straighten back the leaf spring when the vehicle starts to accelerate (speed up or slow down) and the third force is the straining force that tries to twist the leaf spring when a vehicle enters a curve. According to the invention within the known state of the art, while leaf springs are being tested, only the falling into the pit and acceleration is being tested, however a test regarding a vehicle entering a curve is not applied. Due to this various problems arise regarding both the quality and usage life of leaf springs. By means of the multi functional test device for leaf springs, the problems in relation to quality, usage life, production cost problems are eliminated.
Aim and brief description of the Invention
The invention is related to a multi functional test device that enables to carry out tests under real strain conditions by applying (falling into a pit, acceleration, taking a curve) all kinds of strain forces that the leaf springs are subjected to during usage.
By means of the development of said multi functional test device for leaf springs subject to the invention a real like test can be performed even if two strains or three strain forces are applied together. Moreover as testing under real strain conditions allow a more precise determination of the usage life of the spring leaf in comparison to the testing in the prior art, the product developments that are required to be carried out is provided.
Thereby the quality of the leaf spring that is produced is improved and the profit rate is increased for the seller of the leaf spring, whereas purchasing costs are decreased for the party who is buying the leaf spring as the buyer shall be purchasing a product which has high durability.
Description of the drawings illustrating the invention
The drawings and their related explanations used in order to further illustrate the multi functional test device for testing leaf springs that is developed according to the invention have been given below.
Figure-1: Front view of the multi functional test device for testing leaf springs Figure-2: Left side view of the multi functional test device for testing leaf springs
Figure-3: Isometric detail view of the leaf spring coupling mechanism
Figure-4: Isometric view of the multi functional test device for testing leaf springs
Definitions of the aspects/ parts/ sections forming the invention
The parts and sections of the drawings in order to further describe the multi functional test device for leaf springs developed according to the invention have each been numbered and the references of each number have been listed below.
1. Bottom plate
2. Short column
3. Long column
4. Strut
5. Side band
6. Bottom beam
7. Plate
8. Guide
9. Sliding support
10. Eye coupling apparatus
11. Nut
12. Pin
13. Screw
14. Top plate
15. Bottom coupling part
16. Top coupling part
17. Screw
18. Force application rod
19. Ball bearing
20. Front end coupling of an outer piston
21. First outer piston
22. Second outer piston
23. Bottom part for an inner piston front end coupling
24. Joint for the inner piston front end coupling
25. Top part for an inner piston front end coupling
26. First inner piston 27. Second inner piston
28. Rear end piston connection
29. Top beam
30. Leaf spring
31. Clamp
Detailed description of the invention
Tests are carried out to increase the safety and usage lives of leaf springs used in road and rail vehicles by means of the invention subject to the application. A multi functional test device for a leaf spring subject to the invention comprises;
1. A bottom plate (1)
2. A short column (2)
3. A long column (3)
4. A strut (4)
5. A side band (5)
6. A bottom beam (6)
7. A plate (7)
8. A guide (8)
9. A sliding support (9)
10. An eye coupling apparatus (10)
11. A nut (11)
12. A pin (12)
13. U screw (13)
14. A top plate (14)
15. A bottom coupling part (15)
16. A top coupling part (16)
17. A screw (17)
18. A force application rod (18)
19. A ball bearing (19)
20. Front end coupling of an outer piston (20)
21. A first outer piston (21)
22. A second outer piston (22)
23. A bottom part for an inner piston front end coupling (23) 24. A joint for the inner piston front end coupling (24)
25. A top part for an inner piston front end coupling (25)
26. A first inner piston (26)
27. A second inner piston (27)
28. A rear end piston connection (28)
29. A top beam (29)
30. A leaf spring (30)
31. A clamp (31)
The multi functional test device for leaf springs enables the movements of the leaf spring (30) such that they are similar to the strain conditions during real usage conditions. The leaf spring (30) is fixed to the multi functional test device for testing leaf springs, from the centre with a two part system. Said two parted system is formed from a bottom coupling part (15) for leaf spring and a top coupling part (16) for leaf spring. Screws (17) and nuts (11) hold the two parted system together. The top coupling part (16) for the leaf spring carries out the leaf spring (30) acceleration motion and the force application rod (18) carries out the falling into pit and taking the curve motions. The coupling of the force application rod (18) with the leaf spring top coupling part (16) is performed with a screw (17) and nut (11). The leaf spring (30) is connected via a pin (12), U screw (13) and nuts to the two eye connection apparatus (10) from its two eye sections (ends).
For pistons that can move independent from each other are present to carry out the three different strains that arise during the real usage of the leaf spring (30). These are formed by two outer pistons, namely the first outer piston (21) and the second outer piston (22) and two inner pistons; namely the first inner piston (26) and the second inner piston (27). The first outer piston (21) and the second outer piston (22) are coupled to the force application rod (18) by means of a ball bearing (19). The ball bearing (19) has been mounted inside the outer piston front end coupling (20). The first outer piston (21) and the second outer piston (22) both simultaneously move in the same direction (up and down) at the same distance thereby applying force onto the leaf spring (28) via the force application rod (18) in order to perform the "falling into the pit" action of the leaf spring. In order perform the force that the leaf spring will be subjected to when a vehicle takes a curve, the first outer piston (21) moves downward and the second outer piston (22) moves upward at an equal distance thereby applying a twisting moment onto the leaf spring (30) via the force application rod (18). The strain of the leaf spring in the case that a vehicle accelerates is carried out by the first inner piston (26) and the second inner piston (27). The first inner piston (26) applies force onto the leaf spring (30) via the leaf spring coupling top part (16) in order to create the negative acceleration (slowing down) motion. The second inner piston (27) applies force onto the leaf spring (30) via the leaf spring top coupling part (16) in order to create the positive acceleration (speeding up) motion.

Claims

1. A multi functional test device having a bottom plate (1) a short column (2) a long column (3), a strut (4), a side band (5), a bottom beam (6), a plate (7), a guide (8), a sliding support (9), an eye coupling apparatus (10), a nut (11), a pin (12), U screw (13), a top plate (14), a screw (17), a ball bearing (19), front end coupling of an outer piston (20), a first outer piston (21), a second outer piston (22), a joint for the inner piston front end coupling (24), a first inner piston (26), a second inner piston (27), a rear end piston connection (28), a top beam (29), a leaf spring (30), a clamp (31) for leaf springs on which the static and dynamic tests are carried out; wherein said leaf springs are used in road and rail vehicles, characterized in that said device comprises:
• A top connection part (16) for the leaf spring which provides the force (speeding up slowing down) during the acceleration of the leaf spring (30)
• A top coupling part (15) and a bottom coupling part (16) which enable the coupling from the leaf spring (30) centre to the test device,
• A force application rod (18) that provides the forces subjected to the leaf spring (30) when the vehicles falls into a pit or enters a curve,
• A bottom part (23) for the connection of the inner piston front end which enables the contact between the leaf spring and the top coupling part (16) by moving by means of the structure formed together with the joint for the inner piston front end coupling (24) and the top part of the inner piston front end coupling (25),
• A top part (25) for the inner piston end coupling that provides the necessary angular motion together with the joint for the inner piston front end coupling (24) and the bottom part (23) for the inner piston front end coupling.
2. A multi functional test device for leaf springs according to claim 1, characterized in that; it comprises a bottom part (23) for the inner piston front end coupling wherein said part enables the angular motion of the top part (25) of the inner piston front end coupling by moving together with the joint (24) of the inner piston front end coupling.
3. An operation method of the multi functional test device for leaf springs according to claim 1, characterized in that it comprises the following steps; Coupling of the leaf spring (30) to the bottom coupling part (15) and the top coupling part (16) from the centre,
Application of force to the force application rod (18) through the movement of the first outer piston (21) and the second outer piston (22) at an equal distance at the same direction simultaneously,
Application of twisting moment to the force application rod (18) by means of the motion of the first outer piston (21) and the second outer piston (22) together, simultaneously and in opposite directions at an equal distance, thereby performing the test of the vehicle that enters curve,
Carrying out the negative acceleration test by applying force onto the leaf spring (30) via the top coupling part (16) of the first inner piston (26),
Carrying out the positive acceleration test by applying force onto the leaf spring (30) via the top coupling part (16) of the second inner piston (27).
PCT/TR2015/000048 2014-05-22 2015-02-11 Multi functional test device for leaf springs Ceased WO2015178865A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201405719 2014-05-22
TR2014/05719 2014-05-22

Publications (1)

Publication Number Publication Date
WO2015178865A1 true WO2015178865A1 (en) 2015-11-26

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109115637A (en) * 2018-11-06 2019-01-01 中南大学 A kind of fatigue impact combination loading structure pilot system
KR102255891B1 (en) * 2021-01-29 2021-05-24 임병철 A Test Apparatus Of Leaf Spring For Automotive
KR200494385Y1 (en) * 2021-01-29 2021-09-29 허권 A Test Apparatus Of Leaf Spring For Automotive Available of Convinient Testing
CN114459778A (en) * 2021-12-22 2022-05-10 东风柳州汽车有限公司 A new energy truck energy capture leaf spring adjustment test system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4951504A (en) * 1988-07-13 1990-08-28 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Process and apparatus for testing the axles and/or springs and/or adjacent components of commercial vehicles
US6199427B1 (en) 1997-12-04 2001-03-13 Intercomp Company Apparatus and method for testing leaf springs
US8230733B2 (en) * 2009-05-14 2012-07-31 Ford Global Technologies, Llc Spring member test apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4951504A (en) * 1988-07-13 1990-08-28 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Process and apparatus for testing the axles and/or springs and/or adjacent components of commercial vehicles
US6199427B1 (en) 1997-12-04 2001-03-13 Intercomp Company Apparatus and method for testing leaf springs
US8230733B2 (en) * 2009-05-14 2012-07-31 Ford Global Technologies, Llc Spring member test apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109115637A (en) * 2018-11-06 2019-01-01 中南大学 A kind of fatigue impact combination loading structure pilot system
KR102255891B1 (en) * 2021-01-29 2021-05-24 임병철 A Test Apparatus Of Leaf Spring For Automotive
KR200494385Y1 (en) * 2021-01-29 2021-09-29 허권 A Test Apparatus Of Leaf Spring For Automotive Available of Convinient Testing
CN114459778A (en) * 2021-12-22 2022-05-10 东风柳州汽车有限公司 A new energy truck energy capture leaf spring adjustment test system
CN114459778B (en) * 2021-12-22 2024-05-28 东风柳州汽车有限公司 New energy truck energy harvesting leaf spring regulation test system

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