JPS60203563A - Skid sensor for car hydraulic brake system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating table type skid sensing device for use in vehicle hydraulic brake systems. The device comprises a flywheel machine rotatable with an axle adapted to be driven by the wheels to be braked, together with a flywheel member and a thrust member,
In response to relative angular movement between the members, one of the members is moved in one axial direction relative to the other, and the members are moved axially to a first angular position in which the members are in predetermined angular alignment. One of the movable members is of type m, in which the flywheel mechanism includes a cam device for moving the brake pressure regulator between a second angular position and a cooperating device for actuating the brake pressure regulator.

In skid sensing devices of the above type, when applying sudden brakes when the vehicle is driving at low speeds, for example in traffic jams, the brakes can be released prematurely but in response to a true skid signal. Problems may arise in some cases. This is due to the sensitivity of the skid detector, which prevents the skid detector from activating until the vehicle is traveling at a predetermined minimum speed, thereby preventing the skid detector from activating when the vehicle in front suddenly stops. It is desirable to avoid the risk of rear-end collision.

British Patent No. 1,241,798 incorporates a suppressor which prevents activation of the skid sensing device at low vehicle speeds. A skid sensing device is disclosed, particularly for use in heavy vehicles. The skid sensing device of British Patent No. 1,241,798 includes a first speed-responsive governor mechanism which is rotatable in synchronism with a rotating member of a wheel pivot. 2. The first brake is released by moving the control element in the axial direction with respect to the rotating member when the rotational speed of the rotating member is at a critical speed for closing (collapse) or a speed below one stroke. It has a speed-responsive governor.

The restraint device has a second speed-responsive governor mechanism having a critical speed greater than a critical speed of the first speed-responsive governor mechanism, the governor mechanism being in a closed position at low vehicle speeds. Sometimes, in cooperation with a control element, the control element moves axially relative to the rotating member? and thereby prevent said first governor mechanism from closing and releasing the brake. Each governor mechanism has a pair of weights disposed circumferentially around a rotating member, each weight being pivoted for angular movement about an axis in a plane perpendicular to the axis of the rotating member. The arm is fixed to the outer end of a movably mounted arm so that the arm and its respective weights move along an arc in a plane containing the axis of the rotating member.

According to the invention in a skid sensing device of the above type:
A centrifugally actuated locking device is provided for aligning and locking the two members in the first angular position against relative movement, the locking device being responsive to a centrifugal force having a magnitude corresponding to a predetermined minimum ground clearance of the vehicle. and the locking device is automatically releasable, the locking device having at least one weight movable in a plane perpendicular to the axis of the axle, the weight being normally biased by a resilient biasing device. The weight is biased inwardly to a fixed position to bring the two members together and fixed at °C, and moves outward to a disengaged position when the centrifugal force received by the weight is greater than a value corresponding to the minimum ground speed; The two members are then free to move relative to each other.

The weight may have a plunger guided in a radial hole in one of the two members and resiliently biased to engage a mating notch in the other member with its inner end.

Instead, the weight is pivotally mounted on a pivot on one member for movement about an axis parallel to the axis of the axle, biasing a portion of the weight against the other member. It may have a spring, usually mounted on a pivot, for engaging the mating notch.

The cutout can be continuous over approximately the length of the circumference. A weight engages the groove to prevent relative axial movement between the two members. Alternatively, the notch may form an axial recess so that the weight engages and prevents relative angular movement between the two members.

When the fixing device includes plungers, it is preferred that two such plungers be provided and diametrically opposed to each other. It has a flexible annular profile and is received at least partially in an annular recess at one end of the flywheel. In such a configuration, the locking device is carried by the flywheel member and the cutout is provided in the adjacent outer surface of the thrust member.

Two embodiments of the invention will be described below with reference to the accompanying drawings.

The sensing device shown in FIGS. 1 and 2 has a housing 1 containing a hydraulic pump 2 and a combined pressure relief valve and regulator assembly 3. The sensing device shown in FIGS. Protruding from both ends of housing 1 °C
A longitudinally extending axle 4 is connected at one end to the wheel to be braked and at the other end carries a skid sensing device f5 in the form of a flywheel, which flywheel body is mounted within the cylindrical radial rim portion 6 of the housing 10. The open outer end of the rim part is closed by a removable cover 7. Rim part 6
protects the mechanism from stone chips and other foreign objects flying in the radial direction.

The flywheel body 5 has a flywheel 10 rotatable on spaced apart bearings 11 and 12 adjacent to one end of the axle 4 and an end of the flywheel 10 facing the outer end of the rim portion 6. an annular thrust member 13 that is at least partially housed within an annular recess 14; between the outer edge of the thrust member 13 and the outer wall of the recess 14;

A gap is provided between the inner edge of the thrust member 13 and the inner wall of the recess 14.

Three angularly spaced poles are placed in complementary recesses 16 and 17 on the adjacent surfaces of the flywheel 10 and the thrust member 13.
15 are placed.

Thrust member 13 is carried on the free end of shaft 4 by an attachment device 18. The mounting device has a radial drive flange 19 fixed to the free end of the shaft 4 and projecting axially at its periphery towards the outer end of the rim section 6.

They were placed diametrically opposite each other. A pair of lugs with parallel sides are provided, and a pair of diametrically opposed lugs whose outer peripheral edges frictionally engage with the radial clutch surface 22 on the thrust member 13 slide and receive the lugs. Notch 23 is provided 9
A clutch plate 21 having a dish-like outer shape is provided. The disk shape of the clutch plate 21 creates a gap between it and the free end of the axle 4.

The thrust member 13 is biased toward the flywheel 10 by the force of a biasing spring (not shown), and this force is transmitted to the thrust member 13 via a clutch plate 21 and a rotary lever 24 attached to the housing 1. be done. lever 24 lever 2
Clutch plate 21 is aligned with the rotational axis of axle 40 through adjustable thrust transmission member 25v screwed into clutch plate 21.
, thereby causing a biasing force to be applied to the center of the attachment device 18 .

Since the thrust member 13 can move radially in conjunction with the flywheel 10, the force from the biasing spring is applied to the three balls 1.
It is divided almost equally among the five.

A pair of diametrically opposed weights 30 in the form of plungers enter radial holes 31 in the outer wall or rim 39 of the flywheel 10 that define the outer wall of the annular recess 14 . The radial bore 31 lies in a plane perpendicular to the axis of the axle 4 . The inner end portion 32 of each plunger 30 is tapered in diameter;
It is normally biased by a compression spring 33 in each hole 31 to engage a circumferentially extending groove 34 in the adjacent outer surface of the thrust member 13.

Thus, normally the plunger 30 is urged inwardly by the spring 33 into engagement with the groove 34. This ensures that there is no relative axial movement between the flywheel 10 and the thrust member 13, and that the balls 15 in the recesses 16, 17
is fixed so that there is no relative angular movement.

Centrifugal force generated at vehicle ground speeds higher than the predetermined minimum speed biases plunger 30 radially outwardly into groove 34.
Pull it out and fix the flywheel 10 and thrust member 13! The weight of the plunger 30 is selected to be large enough to allow it to dislodge. In practice, the vehicle's forged low ground speed, e.g. 10
Plunger 3 at lower speeds than m1)h (16Ax/hour)
plunger 3 to prevent zero from releasing the skid sensing device.
One quantity of 0 is selected.

Due to excessive deceleration of the wheels and axles during operation after the plunger 30 is released, the flywheel 10 continues to rotate due to inertia, resulting in relative angular movement between the flywheel 10 and the thrust member 13, resulting in a ball , 15 is hollow 16.1
7 to separate the thrust member 13 and clutch &21 from the flywheel 10 in the axial direction. For this reason, lever 2
4 will rotate to actuate the regulator/discharge valve assembly. The clutch plate 21 slides on the lug. after that,
The flywheel 10 and the thrust member 13 continue to rotate relative to each other against the engagement friction force between the clutch plate 21 and the clutch surface 22, but the magnitude of this friction force is determined by the load of the biasing spring. .

This size can be easily adjusted or set by removing the cover 7v and adjusting the axial position of the member 25 with respect to the lever 24.

As a modification, the nine circumferential grooves 34 are replaced by axial grooves.

Another variation is to omit the hole 31 and the compression spring 33, and instead extend in the circumferential direction and cooperate with the flywheel at one end by a rigid connection or other fastening. By means of a strip of elastic material at the other end, suitable for an elongated plate spring.

A pair of diametrically opposed weights 30 are each supported. The plate spring acts to bias the weight 30 in substantially the same direction as is biased by the compression spring 33.

The configuration and operation of this deformation sensing device is otherwise the first.
It is similar to that of FIG.

In the configuration of FIGS. 3 and 4, the weight 40 is pivotally mounted at one end for angular movement along an arc in a plane perpendicular to the axle axis. The weight 4 rotates around the pivot 410 on the end face of the flywheel 10 adjacent to the recess 14.
0 can move, the pivot 41 being parallel to the pivot leg of the axle 4. The weight 40 has a lever 42 extending circumferentially from the pivot 41 and a weight body 43 carried by the radially outer end of the lever 420 and positioned relatively close to the rim 39 of the flywheel 10 . . Monomer 43 has an arcuate profile and projects circumferentially beyond the outer end of lever 42 remote from pivot 41 . An inwardly directed projection 44 at the outer end of the lever 42 is engageable in an axially extending groove 45 in the outer surface of the thrust member 13.

A slight depression 47 between the lever 42 and the end of the weight body 43 near the pivot 41. Both ends of a tension spring 46 are attached between a prohibition fitting 48 located on the end face of the flywheel 10 and spaced apart from the outer ends of the C lever 42 and the weight body 43. Since the recess 47 is radially offset from the string 49 passing through the pivot 41 and the locking fitting 48, the spring 46 exerts a resultant force on the lever 42 in a direction that would normally bias it into engagement with the protruding groove 45. effect.

Weight t' of weight 40? To compensate, a relief hole 50 is provided in the end wall of the flywheel 10.

By giving most of the weight to ljt body 43 and locating it near rim 390 of flywheel 10, copper 1 and 2
Compared to the values obtained in the example shown in the figure, greater centrifugal speeds can be obtained at 1°C. This is a protrusion 44 and a groove 45
This is advantageous in providing a more abrupt action, as it can jump into or out of engagement.

This is achieved by keeping the distance "XJ?" between the line of action passing through the arch line 49 and the line of action 51 passing through the spring 46 small.

As a result, a quadratic equation is obtained by taking the moment about the pivot axis 410° as shown in FIG.

FrXL=FsXX However, Fs is the spring force of 460, and Fr is the centrifugal force applied to a point on the radius of Leno (-).

Therefore, the centrifugal force Fr easily exceeds the value caused by the extension of the spring 46 due to the relatively small movement of the lever 42 and the spring force F.
It is possible to overcome the effects of s.

The construction and operation of the skid sensing device shown in FIGS. 3 and 4 is otherwise similar to that of FIGS. 1 and 2, and corresponding parts have been provided with corresponding reference numerals.

The skid sensing device fIt described above is commonly used in daily moving vehicles such as motorcycles and small passenger cars.

[Brief explanation of the drawing]

FIG. 1 is an end view of the rotating desk-type skid sensing device with the cover removed for easy understanding. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. Figure 3 shows a different fixing device without the housing, the first
End view similar to fig. Figure 4 is a force line diagram 0 3... Pressure regulator 4... Axle 5... Flywheel mechanism 10... Flywheel eastern member 13.
... Thrust member 14 ... Annular recess 15, 16.17
...Cam device 30...Fixed '4I; Placement, weight 31
... Radial hole 33 ... Elastic biasing device, spring 40
... Fixing device, weight 4 ... Pivot 42 ... Lever 43 ... Weight body 44 ... Protrusion 45 ... Notch 46 ... Elastic biasing device, spring 48 ... Plain stop part 49
・・・Arc wire FIG, 2゜

Claims (1)

[Scope of Claims] (11) A rotary table-type skid sensing device for a vehicle hydraulic brake system, which has a rotatable flywheel mechanism 5 together with an axle 4 driven by a braking wheel. The mechanism, together with the spring member 10 and the thrust member 13, is arranged in a first angular position in which said two members are in a predetermined angular alignment and in which one of said members, which is axially movable, actuates the brake pressure regulating device 3. said two members 10 such that one of said axially movable members is moved uniaxially relative to the other said member between said two members 10 and a second angular position in which said member engages with said member;
．． a cam device 15°16 responsive to relative angular movement between 13;
17, and a centrifugally actuated fixing device 30.40 is provided to fix said two members 10.13 together against relative movement in said first angular position, and The locking device automatically releases in response to a centrifugal force of a magnitude corresponding to a predetermined minimum ground speed of the axle 4;
It has at least one movable weight 30, 40, which weight is normally biased inwardly by elastic biasing [33, 46] into a locking position to lock the two members together. the weight is free to move outwardly to a disengaged position when the centrifugal force exerted on the weight reaches a value greater than a value corresponding to the minimum ground speed, after which the two members are free to disengage from each other; to be able to move freely,
A skid sensing device featuring: (2) a complementary notch 3 in the other member 13 guided in a radial hole 31 in the one member 10;
4. A skid sensing device according to claim 1, wherein said weight includes a plunger 30v which is elastically biased to engage an inner end of said weight. (3) A pivot 41 of the one member 10 so that the weight 40 moves around an axis parallel to the axis of the axle.
Claim 1, characterized in that it is pivotally mounted on the other member and a spring 46 urges a portion of said weight to engage a complementary notch 45 in said other member. The skid sensing device according to item 1). (4) Lever 42 extending circumferentially from the pivot 41
and a weight body 43 carried on the radially outermost end of the lever.
and a protrusion 4 facing inwardly on the lever;
4 is capable of engaging with the notch 45, the skid sensing device according to claim 3. (5) The spring 46 is a tension spring that acts between the first locking portion 48 on the one member 10 and the second locking portion on the weight; Claim 3, characterized in that the locking portion on the weight is deviated outward from the arch line 49 passing through the locking portion 48.
) or (4). (6) The flywheel member 10 is supported by a bearing so as to rotate on the axle 4 and is fixed to the axle 4 in the axial direction, and an annular recess 14 is provided at one end thereof, and the thrust member 13 is attached to the axle. The flywheel member is movable in a direction and has an annular profile and is at least partially received in the annular recess of the flywheel member such that the fixation ft 30.40 is in fixed engagement with the thrust member 13. What is carried by 10'? Characteristic 9% Claim No. (
The skid sensing device according to any one of items 1) to (5).