WO2000068593A1 - Brake device - Google Patents

Brake device Download PDF

Info

Publication number
WO2000068593A1
WO2000068593A1 PCT/SE2000/000805 SE0000805W WO0068593A1 WO 2000068593 A1 WO2000068593 A1 WO 2000068593A1 SE 0000805 W SE0000805 W SE 0000805W WO 0068593 A1 WO0068593 A1 WO 0068593A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
brake device
lamellar disc
corrugated washer
lamellar
Prior art date
Application number
PCT/SE2000/000805
Other languages
French (fr)
Inventor
Ulf Brorsson
Tord Dahlen
Jonny Strandberg
Original Assignee
Volvo Construction Equipment Components Ab
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 Volvo Construction Equipment Components Ab filed Critical Volvo Construction Equipment Components Ab
Publication of WO2000068593A1 publication Critical patent/WO2000068593A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/24—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member
    • F16D55/26—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member without self-tightening action
    • F16D55/28—Brakes with only one rotating disc
    • F16D55/32—Brakes with only one rotating disc actuated by a fluid-pressure device arranged in or on the brake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D2055/0004—Parts or details of disc brakes
    • F16D2055/0058—Fully lined, i.e. braking surface extending over the entire disc circumference
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2127/00—Auxiliary mechanisms
    • F16D2127/02—Release mechanisms

Definitions

  • the present invention relates to a brake device, comprising at least one lamellar disc disposed on a rotatable axle, a first brake plate axially displaceable in relation to the lamellar disc, at least one static second brake plate, which first and second brake plates are provided with surfaces, interacting with the lamellar disc, for braking the rotation of the axle, and at least one spring disposed between the first and second brake plate, which spring endeavours to guide the first brake plate in the direction away from the second brake plate.
  • Brake devices for vehicles and contract machinery are often constituted by friction brakes, which comprise a lamellar disc disposed on the drive axle of the vehicle.
  • the rotation of the drive axle can be braked as a result of the lamellar disc being clamped between the brake plates.
  • the clamping force is generated by one of the brake plates being applied with force against the lamellar disc.
  • the second lamellar disc then constitutes a counter-stay.
  • a brake device commonly available on the market comprises a plurality of helical springs, which are arranged between the brake plates.
  • the springs are held in place by holes made in one of the brake plates.
  • the springs are conically shaped to enable them to be fixed in the holes.
  • This known brake device is however costly to produce, since the manufacturing and assembly costs are high. It has also been shown that the helical springs can work loose from the made holes and can end up in a roller bearing in the brake device, which can lead to failure of the bearing.
  • An object of the present invention is therefore to reduce the manufacturing and assembly costs and increase the reliability of a brake device.
  • the corrugated washer With a resilient corrugated washer, the need for the holes arranged in the brake plate is eliminated, which simplifies the manufacture and hence reduces the manufacturing costs.
  • the corrugated washer is placed between the brake plates, which makes the assembly substantially easier than where a plurality of helical springs are introduced into the made holes. The speed of assembly can thereby be increased. Since the resilient corrugated washer replaces the helical springs, the risk that the bearings in the brake device will fail as a result of these springs working loose is eliminated. The reliability of the brake device is thereby increased. It has also been shown that the initial force for applying the brake device can be more accurately controlled.
  • Fig. 1 shows a section through a brake device according to the invention
  • Fig. 2 shows an enlarged detailed view of a part of the sectional view in Fig. 1
  • Fig. 3 shows a perspective view of a resilient corrugated washer.
  • a brake device 1 according to the invention is shown in a sectional view in Fig. 1.
  • a drive axle 2 comes into the brake device 1 and is coupled to a planetary gear 4, which is accommodated in a static housing 6 for the brake device 1.
  • the planetary gear 4 ensures that the torque and rotation speed of the drive axle 2 is converted and transferred to a wheel hub 8 of the vehicle or contract machine to which the brake device 1 is fitted.
  • Examples of the types of contract machinery to which the brake device 1 according to the invention can be fitted are wheel- mounted loaders and dumpers.
  • the brake device 1 comprising at least one lamellar disc
  • the brake device 1 also comprises a first brake plate 20, which is also axially displaceable in relation to the lamellar disc 10 and which constitutes a piston actuated by a hydraulic pressure from a pressure source (not shown) .
  • the first brake plate 20 is preferably circular and has a circular projection 22, which is introduced into a circular groove 24 in the housing 6. The hydraulic pressure is supplied to the circular groove 24 through one or more ducts 26 in the housing 6.
  • the brake device 1 also comprises a second brake plate 28, which is static and connected to the housing 6.
  • the second brake plate 28 is circular.
  • the second brake plate 28 constitutes a counter-stay whenever a hydraulic pressure is supplied to the duct 26 and the first brake plate 20 thereof is displaced in the direction of the lamellar disc 10 so as to brake the rotation of the lamellar disc 10 and hence of the drive axle 2.
  • the first and second brake plates 20, 28 are thus provided with surfaces 30, interacting with the lamellar disc 10, for braking the rotation of the drive axle 2.
  • the resilient corrugated washer 32 thus displaces the first brake plate 20 away from the lamellar disc 10, so that a gap is formed between the lamellar disc 10 and the first brake plate 20.
  • the lamellar disc 10 is preferably displaceable along the drive axle 2, so that a gap can also be formed between the lamellar disc 10 and the first brake plate 20.
  • the gaps formed between the lamellar disc 10 and the respective brake plate 20, 28 mean that the lamellar disc 10 is able to rotate freely between the brake plates 20, 28 whenever the brake device 1 is not applied, that is to say when no hydraulic pressure has been supplied to the duct 26.
  • Figure 2 relates to an enlarged detailed view of the section in Fig. 1. This indicates how the corrugated washer 32 is arranged between the brake plates 20, 28.
  • the resilient corrugated washer 32 is essentially circular and comprises a plurality of turns of spring material arranged one on top of the other, as is best shown in a perspective view in Fig. 3.
  • the resilient corrugated washer 32 is arranged essentially concentrically in relation to the lamellar disc 10 and has an inner diameter which is greater than the outer diameter of the lamellar disc 10.
  • the corrugated washer 32 thus ends up outside the periphery of the lamellar disc 10, as is shown in Figs. 1 and 2. This means that the corrugated washer 32 does not bear against the lamellar disc 10.
  • the outer diameter of the brake plates 20, 28 is greater than the outer diameter of the lamellar disc 10.
  • a region is thus formed in the respective brake plate 20, 28, which region is circular in the radial direction outside the lamellar disc 10 and in which region the corrugated washer 32 is situated, so that the resilient corrugated washer 32 ends up in a plane essentially common with the lamellar disc 10. It is also conceivable for the resilient corrugated washer 32 only to comprise one continuous turn of spring material.
  • At least two guide pins 34 are arranged in the housing 6.
  • the control pins 34 also fix the brake plates 20, 28, so that these are prevented from rotating when the brake device 1 is applied.
  • the guide pins 34 do however allow the first brake plate 20 to be axially displaceable.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention relates to a brake device (1), comprising at least one lamellar disc (10) disposed on a rotatable axle (2), a first brake plate (20) axially displaceable in relation to the lamellar disc (10), at least one static second brake plate (28), which first and second brake plates (20, 28) are provided with surfaces (30), interacting with the lamellar disc (10), for braking the rotation of the axle (2), and at least one spring (32) disposed between the first and second brake plates (20, 28), which spring endeavours to guide the first brake plate (20) in the direction away from the second brake plate (28). The spring is constituted by a resilient corrugated washer (32).

Description

Brake device
The present invention relates to a brake device, comprising at least one lamellar disc disposed on a rotatable axle, a first brake plate axially displaceable in relation to the lamellar disc, at least one static second brake plate, which first and second brake plates are provided with surfaces, interacting with the lamellar disc, for braking the rotation of the axle, and at least one spring disposed between the first and second brake plate, which spring endeavours to guide the first brake plate in the direction away from the second brake plate.
Brake devices for vehicles and contract machinery are often constituted by friction brakes, which comprise a lamellar disc disposed on the drive axle of the vehicle.
By arranging brake plates or brake linings on each side of the lamellar disc, the rotation of the drive axle can be braked as a result of the lamellar disc being clamped between the brake plates. The clamping force is generated by one of the brake plates being applied with force against the lamellar disc. The second lamellar disc then constitutes a counter-stay. When the brake plates subsequently come to release the grip on the lamellar disc, a spring device ensures that the brake plates are displaced in the direction away from the lamellar disc.
A brake device commonly available on the market comprises a plurality of helical springs, which are arranged between the brake plates. The springs are held in place by holes made in one of the brake plates. The springs are conically shaped to enable them to be fixed in the holes. This known brake device is however costly to produce, since the manufacturing and assembly costs are high. It has also been shown that the helical springs can work loose from the made holes and can end up in a roller bearing in the brake device, which can lead to failure of the bearing.
An object of the present invention is therefore to reduce the manufacturing and assembly costs and increase the reliability of a brake device.
This is achieved by a brake device of the type stated in the introduction, in which the spring is constituted by a resilient corrugated washer.
With a resilient corrugated washer, the need for the holes arranged in the brake plate is eliminated, which simplifies the manufacture and hence reduces the manufacturing costs. In the assembly, the corrugated washer is placed between the brake plates, which makes the assembly substantially easier than where a plurality of helical springs are introduced into the made holes. The speed of assembly can thereby be increased. Since the resilient corrugated washer replaces the helical springs, the risk that the bearings in the brake device will fail as a result of these springs working loose is eliminated. The reliability of the brake device is thereby increased. It has also been shown that the initial force for applying the brake device can be more accurately controlled. Under certain circumstances, it may be desirable to increase the initial force for applying the brake device with a view to obtaining a gentler deceleration of the vehicle or contract machine. With the resilient corrugated washer, a greater initial force is obtainable compared with the previous helical springs.
The invention will be described in greater detail below with reference to an illustrative embodiment shown in the appended drawings, in which Fig. 1 shows a section through a brake device according to the invention,
Fig. 2 shows an enlarged detailed view of a part of the sectional view in Fig. 1, and Fig. 3 shows a perspective view of a resilient corrugated washer.
A brake device 1 according to the invention is shown in a sectional view in Fig. 1. A drive axle 2 comes into the brake device 1 and is coupled to a planetary gear 4, which is accommodated in a static housing 6 for the brake device 1. The planetary gear 4 ensures that the torque and rotation speed of the drive axle 2 is converted and transferred to a wheel hub 8 of the vehicle or contract machine to which the brake device 1 is fitted. Examples of the types of contract machinery to which the brake device 1 according to the invention can be fitted are wheel- mounted loaders and dumpers.
The brake device 1 comprising at least one lamellar disc
10 disposed on the drive axle 2, which lamellar disc on preferably both sides has a friction material 12, such as sintered bronze. The lamellar disc 10 can be arranged by means of a splined joint 14 directly on the drive axle 2 or, as is shown in Fig. 1, on the sun wheel 18 of the planetary gear 4. The brake device 1 also comprises a first brake plate 20, which is also axially displaceable in relation to the lamellar disc 10 and which constitutes a piston actuated by a hydraulic pressure from a pressure source (not shown) . The first brake plate 20 is preferably circular and has a circular projection 22, which is introduced into a circular groove 24 in the housing 6. The hydraulic pressure is supplied to the circular groove 24 through one or more ducts 26 in the housing 6. The brake device 1 also comprises a second brake plate 28, which is static and connected to the housing 6. Preferably, the second brake plate 28 is circular. The second brake plate 28 constitutes a counter-stay whenever a hydraulic pressure is supplied to the duct 26 and the first brake plate 20 thereof is displaced in the direction of the lamellar disc 10 so as to brake the rotation of the lamellar disc 10 and hence of the drive axle 2. The first and second brake plates 20, 28 are thus provided with surfaces 30, interacting with the lamellar disc 10, for braking the rotation of the drive axle 2.
Between the first and second brake plates 20, 28 there is disposed a resilient corrugated washer 32, which endeavours to guide the first brake plate 20 in the direction away from the second brake plate 28 when the hydraulic pressure is removed from the duct 26. The resilient corrugated washer 32 thus displaces the first brake plate 20 away from the lamellar disc 10, so that a gap is formed between the lamellar disc 10 and the first brake plate 20. The lamellar disc 10 is preferably displaceable along the drive axle 2, so that a gap can also be formed between the lamellar disc 10 and the first brake plate 20. The gaps formed between the lamellar disc 10 and the respective brake plate 20, 28 mean that the lamellar disc 10 is able to rotate freely between the brake plates 20, 28 whenever the brake device 1 is not applied, that is to say when no hydraulic pressure has been supplied to the duct 26.
Figure 2 relates to an enlarged detailed view of the section in Fig. 1. This indicates how the corrugated washer 32 is arranged between the brake plates 20, 28.
The resilient corrugated washer 32 is essentially circular and comprises a plurality of turns of spring material arranged one on top of the other, as is best shown in a perspective view in Fig. 3. Preferably, the resilient corrugated washer 32 is arranged essentially concentrically in relation to the lamellar disc 10 and has an inner diameter which is greater than the outer diameter of the lamellar disc 10. The corrugated washer 32 thus ends up outside the periphery of the lamellar disc 10, as is shown in Figs. 1 and 2. This means that the corrugated washer 32 does not bear against the lamellar disc 10. To enable the corrugated washer 32 to bear against the respective brake plate 20, 26, the outer diameter of the brake plates 20, 28 is greater than the outer diameter of the lamellar disc 10. A region is thus formed in the respective brake plate 20, 28, which region is circular in the radial direction outside the lamellar disc 10 and in which region the corrugated washer 32 is situated, so that the resilient corrugated washer 32 ends up in a plane essentially common with the lamellar disc 10. It is also conceivable for the resilient corrugated washer 32 only to comprise one continuous turn of spring material.
In order to fix the resilient corrugated washer 32 in the plane essentially common with the lamellar disc 10, at least two guide pins 34 are arranged in the housing 6. Preferably, the control pins 34 also fix the brake plates 20, 28, so that these are prevented from rotating when the brake device 1 is applied. The guide pins 34 do however allow the first brake plate 20 to be axially displaceable.

Claims

Patent Claims
1. Brake device, comprising at least one lamellar disc
(10) disposed on a rotatable axle (2) , a first brake plate (20) axially displaceable in relation to the lamellar disc (10) , at least one static second brake plate (28) , which first and second brake plates (20, 28) are provided with surfaces (30) , interacting with the lamellar disc (10) , for braking the rotation of the axle (2) , and at least one spring (32) disposed between the first and second brake plates (20, 28) , which spring endeavours to guide the first brake plate (20) in the direction away from the second brake plate (28) , characterized in that the spring is constituted by a resilient corrugated washer (32) .
2. Brake device according to Claim 1, characterized in that the resilient corrugated washer (32) is arranged essentially concentrically in relation to the lamellar disc (10) .
3. Brake device according to Claim 1 or 2 , characterized in that the resilient corrugated washer (32) is essentially circular.
4. Brake device according to Claim 3, characterized in that the resilient corrugated washer (32) has an inner diameter which is greater than the outer diameter of the lamellar disc (10) .
5. Brake device according to any of the preceding claims, characterized in that the resilient corrugated washer (32) is disposed in a plane essentially common with the lamellar disc (10) .
6. Brake device according to any of the preceding claims, characterized in that at least two guide pins (34) are arranged to fix the resilient corrugated washer (32) .
7. Brake device according to any of the preceding claims, characterized in that the resilient corrugated washer
(32) comprises a plurality of layers of washers, arranged one on top of the other, consisting of turns of spring material .
PCT/SE2000/000805 1999-05-06 2000-04-28 Brake device WO2000068593A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9901646-1 1999-05-06
SE9901646A SE515791C2 (en) 1999-05-06 1999-05-06 BRAKE MECHANISM

Publications (1)

Publication Number Publication Date
WO2000068593A1 true WO2000068593A1 (en) 2000-11-16

Family

ID=20415496

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2000/000805 WO2000068593A1 (en) 1999-05-06 2000-04-28 Brake device

Country Status (2)

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SE (1) SE515791C2 (en)
WO (1) WO2000068593A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2849404A1 (en) * 1977-11-15 1979-05-17 Dewandre Co Ltd C Spring brake operating mechanism - has disc spring(s) formed from series of segmented rings with inner edges engaging pretensioned piston
EP0127932A1 (en) * 1983-04-07 1984-12-12 Eaton Corporation Brake disc mounting
US4752178A (en) * 1986-12-17 1988-06-21 Smalley Steel Ring Company Waved retaining ring

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2849404A1 (en) * 1977-11-15 1979-05-17 Dewandre Co Ltd C Spring brake operating mechanism - has disc spring(s) formed from series of segmented rings with inner edges engaging pretensioned piston
EP0127932A1 (en) * 1983-04-07 1984-12-12 Eaton Corporation Brake disc mounting
US4752178A (en) * 1986-12-17 1988-06-21 Smalley Steel Ring Company Waved retaining ring

Also Published As

Publication number Publication date
SE9901646L (en) 2000-11-07
SE515791C2 (en) 2001-10-08
SE9901646D0 (en) 1999-05-06

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