JPH0349782B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating flywheel type skid sensing device for use in vehicle hydraulic brake systems.

The present invention is a rotating flywheel-type skid sensing device for a vehicle hydraulic brake system, which has a flywheel mechanism that rotates together with an axle driven by a wheel to be braked, and the flywheel mechanism includes a flywheel member, a thrust member, and both of the wheels. a cam device responsive to relative angular movement between the members, the cam device being arranged between a first angular position in which the members are in predetermined angular alignment and one of the members axially movable; is adapted to move said one of said members axially relative to the other of said members between a second angular position in which said member cooperates with a device for actuating a brake pressure regulating device; A centrifugally actuated locking device is provided for locking the members together in the first angular position, the locking device being configured to automatically adjust in response to a centrifugal force of a magnitude corresponding to a predetermined minimum travel speed of the vehicle. the fixing device has at least one weight movable in a plane perpendicular to the axis of the vehicle, the weight fixing the parts together, usually by means of an elastic biasing device. the weight is biased to an inward fixed position, and the weight is moved outward to a release position when the centrifugal force exerted on the weight reaches a value greater than the value corresponding to the minimum running speed;
The present invention relates to a skid sensing device of the type in which both said members are movable relative to each other.

In skid sensing devices of the type described above, when the vehicle is traveling at low speeds, for example in a traffic jam, and sudden braking is applied, the brakes may 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 detection device, which prevents the skid detection device from activating until the vehicle is traveling at a predetermined minimum speed, thereby preventing the vehicle from colliding with the vehicle in front if it suddenly stops. It is desirable to avoid the risk of

GB 1241798 discloses a skid sensing device, particularly for heavy vehicles, which incorporates a restraining device to prevent activation of the skid sensing device at low vehicle speeds. The skid sensing device of GB 1242798 includes a first speed responsive governor rotatable in synchronism with a wheel driven rotating member, the first speed responsive governor mechanism being closed. A first speed response adapted to effect brake release by moving a control element axially relative to the rotating member when the rotational speed of the rotating member is at or below a critical speed (to collapse). It has a speed 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. At times, the control element cooperates with the control element to prevent the control element from moving axially relative to the rotating member, thereby preventing the 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. A movably mounted arm is secured to the outside of the arm so that the arm and its respective weights move along an arc in a plane containing the axis of the rotating member.

The present invention provides the type skid sensing device in which the weight is guided through a radial hole provided in one of the members and is inserted into a corresponding notch in the other of the members. It features a plunger whose ends are resiliently biased into engagement. The invention also provides a scatter sensing device of the type described above, wherein the weight is pivotally mounted on a pivot of one of the members and is pivotable about an axis parallel to the axis of the axle. , which is biased by a spring and typically engages a corresponding notch in the other of the two parts.

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. An axle 4 projecting from both ends of the housing 1 and extending longitudinally is connected at one end to the wheel to be braked and at the other end carries a skid sensing device 5 in the form of a flywheel, the flywheel assembly being connected to the cylindrical shape of the housing 1. is enclosed within a radial rim portion 6 of the rim portion, the open outer end of which is closed by a removable cover 7. The rim portion 6 protects the mechanism from radially flying stones and other foreign objects.

The flywheel assembly 5 has a flywheel 10 rotatable on bearings 11 and 12 spaced apart adjacent 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; Outer edge of thrust member 13 and recess 1
A gap is provided between the outer wall of the recess 14 and between the inner edge of the thrust member 13 and the inner wall of the recess 14.

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

The thrust member 13 is carried on the free end of the shaft 4 by means of a mounting device 18 . The attachment device has radial drive flanges 19 fixed to the free end of the shaft 4, projecting axially at its periphery towards the outer end of the rim portion 6 and arranged diametrically oppositely. , a pair of lugs 20 whose sides are parallel, and a thrust member 13
A clutch plate 21 is provided which has a dished profile and is provided with a pair of diametrically opposed notches 23 which frictionally engage the outer periphery of the upper radial clutch surface 22 and which slidably receive the lugs 20. It will be done. clutch plate 21
Due to its dish shape, a gap is created between the free end of the axle 4 and the free end of the axle 4.

The thrust member 13 is biased towards 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 mounted on the housing 1. . The lever 24 acts on the clutch plate 21 in a position axially aligned with the axis of rotation of the axle 4 via an adjustable thrust transmission member 25 screwed into the lever 24, so that a biasing force is applied to the center of the mounting device 18. It becomes like this. Since the thrust member 13 can move radially along with the flywheel 10, the force from the bias spring is shared approximately equally between the three balls 15.

A flywheel 10 defining an outer wall of an annular recess 14
in the radial hole 31 in the outer wall or rim 39 of the
A pair of diametrically opposed weights 30 in the form of plungers are inserted. 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, and the thrust member 13
a circumferentially extending groove 34 in the adjacent outer surface of the
The holes 31 are normally biased by compression springs 33 in each hole 31 into engagement.

Thus, normally the plunger 30 will be biased inwardly by the spring 33 into engagement with the groove 34. This prevents the flywheel 10 and the thrust member 13 from moving in the axial direction relative to each other, and also prevents the flywheel 10 and the thrust member 13 from moving in the axial direction.
Due to the presence of the ball 15 contained in the ball 17, it is fixed so that there is no relative angular movement.

The centrifugal force generated at vehicle ground speeds higher than the predetermined minimum speed is sufficiently large to urge the plunger 30 radially outwardly and pull it out of the groove 34 to unfasten the flywheel 10 and thrust member 13. The weight of the plunger 30 is selected. in fact,
Minimum ground speed of the vehicle, e.g. 10mph (16km/hour)
The weight of the plunger 30 is chosen such that at lower speeds the plunger 30 does not release the skid sensing device.

Due to excessive deceleration of the wheels and axles in operation after the plunger 30 is released, the flywheel 1
0 continues to rotate due to inertia, and as a result, relative angular movement occurs between the flywheel 10 and the thrust member 13,
The balls 15 escape from the recesses 16, 17 and cause the thrust member 13 and clutch plate 21 to be axially separated from the flywheel 10. This causes the lever 24 to rotate and actuate the regulator and release valve assembly. Clutch plate 21 slides on lug 20.
Thereafter, 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, and the magnitude of this friction force is determined by the load of the biasing spring. This size is
Remove the cover 7 and remove the member 25 for the lever 24.
It can be easily adjusted or set by adjusting the axial position of.

As a variant, the circumferential groove 34 is replaced by an axial groove.

As another modification, the hole 31 and the compression spring 33
diametrically opposed by the other end of a strip of elastic material, which is suitable as an elongated leaf spring, extending approximately circumferentially and cooperating with the flywheel at one end by a rigid connection or other tether; Each of the pair of weights 30 is supported. The leaf spring acts to bias weight 30 in approximately the same direction as is biased by compression spring 33. The construction and operation of the sensing device of this variant is otherwise similar to that of FIGS. 1 and 2.

In the configurations shown in Figures 3 and 4, the weight 4
0 is pivotally mounted at one end for angular movement along an arc in a plane perpendicular to the axle axis. The weight 40 can be moved around a pivot 41 on the end face of the flywheel 10 adjacent to the recess 14, the pivot 41 being parallel to the axis of the axle 4. The weight 40 includes a lever 42 extending circumferentially from a pivot 41 and a weight 43 carried by the radially outer end of the lever 42 and positioned relatively close to the rim 39 of the flywheel 10. have The weight body 43 has an arcuate outer shape, and the lever 42 is spaced apart from the pivot 41.
protrudes circumferentially beyond the outer edge of. Lever 4
The inwardly directed protrusion 44 at the outer end of the thrust member 13 forms a groove 4 extending in the axial direction on the outer surface of the thrust member 13.
5.

A slight depression 47 between the lever 42 and the end of the weight body 43 near the pivot 41 and the flywheel 1
Both ends of the tension spring 46 are attached between locking fittings 48 which are located on the end surface of 0 and are spaced apart from the outer ends of the lever 42 and the weight body 43. The depression 47 is cardinal 4
1 and the locking fitting 48, the spring 46 exerts a resultant force on the lever 42 in a direction that would normally bias the projection into engagement with the groove 45.

To compensate for the weight of the weight 40, the flywheel 1
A weight reduction hole 50 is provided in the end wall of 0.

Most of the weight is given to the weight body 43 and the flywheel 1
0 near the rim 39 of the first
A greater centrifugal effect is obtained at constant speed compared to the values obtained in the embodiment shown in FIGS.
This is advantageous in providing a more abrupt action so that the protrusion 44 can pop into or out of engagement with the groove 45.

This is accomplished by keeping the distance "X" between the line of action through chord line 49 and the line of action 51 through spring 46 relatively small.

As a result, by taking the moment around the pivot shaft 41 as shown in FIG. 4, the following equation is obtained.

Fr × L = Fs ×

Therefore, the centrifugal force Fr is caused by the relatively small lever 42.
The action of the spring force Fs can be easily overcome by the movement of the spring 46, which exceeds the value caused by the extension of the spring 46.

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 described above is suitable for use in light motor vehicles such as motorcycles and other small passenger cars.

[Brief explanation of drawings]

Figure 1 is an end view of the rotary flywheel type skid sensing device with the cover removed for easy understanding, Figure 2 is a sectional view taken along line 2-2 in Figure 1, and Figure 3 is a different fixation without the housing. FIG. 4 is an end view similar to FIG. 1 and a force diagram showing the device. 3... Pressure adjustment device, 4... Axle, 5... Flywheel mechanism, 10... Flywheel member, 13... Thrust member, 14... Annular recess, 15, 16, 17...
...Cam device, 30...Fixing device, weight, 31...
...Radial hole, 33...Elastic biasing device, spring, 4
0...Fixing device, weight, 41...Pivot, 42...
... Lever, 43 ... Weight body, 44 ... Protrusion, 45
... Notch, 46 ... Elastic biasing device, spring, 48
... Connecting part, 49 ... String line.

Claims (1)

[Scope of Claims] 1. A rotary flywheel type skid sensing device for a vehicle hydraulic brake system, which has a flywheel mechanism 5 that rotates together with an axle 4 driven by a wheel to be braked, and the flywheel mechanism includes a flywheel member 10. , a thrust member 13 and a cam device 15, 16, 17 responsive to relative angular movement between said members 10, 13, said cam device including a first and a second angular position in which one of the two parts 10, 13 which is axially movable cooperates with a device for actuating the brake pressure regulating device 3.
0 and 13 are moved in the axial direction relative to the other of the two members, and in the first angular position, the two members 10 and 1
3 to each other, a centrifugally actuated locking device is provided, the locking device being automatically released in response to a centrifugal force of a magnitude corresponding to a predetermined minimum travel speed of the vehicle; , comprising at least one weight movable in a plane perpendicular to the axis of said axle 4, said weight having an inner fixation which fixes said parts 10, 13 to each other, usually by means of an elastic biasing device. position, and when the centrifugal force exerted on the weight reaches a value greater than the value corresponding to the minimum running speed, the weight moves outward to the release position, thereby causing the members 10, 13 to move relative to each other. In the skid sensing device, the weight is movable as follows.
Guided by a radial hole 31 provided in one of the members 10 and 13, the both members 1
Corresponding notch 34 in the other member 13 of 0,13
A skid sensing device characterized in that it is a plunger 30 which is resiliently biased to engage an inner end therein. 2. A skid sensing device according to claim 1, characterized in that said weights are two plungers (30) each guided in two diametrically opposed radial holes (31). 3. A rotary flywheel-type skid sensing device for a vehicle hydraulic brake system, which has a flywheel mechanism 5 that rotates together with an axle 4 driven by a wheel to be braked, and the flywheel mechanism includes a flywheel member 10, a thrust member 13, and a thrust member 13. It consists of a cam arrangement 15, 16, 17 responsive to relative angular movement between said members 10, 13, said cam arrangement being arranged in a first angular position in which said members 10, 13 are in a predetermined angular alignment; between a second angular position in which one of the two parts 10, 13 which is axially movable cooperates with a device for actuating the brake pressure regulating device 3;
0 and 13 are moved in the axial direction relative to the other of the two members, and in the first angular position, the two members 10 and 1
3 to each other, a centrifugally actuated locking device is provided, the locking device being automatically released in response to a centrifugal force of a magnitude corresponding to a predetermined minimum travel speed of the vehicle; , comprising at least one weight movable in a plane perpendicular to the axis of said axle 4, said weight having an inner fixation which fixes said parts 10, 13 to each other, usually by means of an elastic biasing device. position, and when the centrifugal force exerted on the weight reaches a value greater than the value corresponding to the minimum running speed, the weight moves outward to the release position, thereby causing the members 10, 13 to move relative to each other. In the skid sensing device, the weight 40 is movable.
is pivotally attached to a pivot 41 of one of the members 10, 13, is pivotable about an axis parallel to the axis of the axle 4, is biased by a spring 46, and is normally is the above-mentioned both members 1
Corresponding notch 45 in the other member 13 of 0,13
A skid sensing device characterized in that it is engaged with a skid sensing device. 4. The weight 40 consists of a lever 42 extending circumferentially from the pivot shaft 41 and a weight body 43 carried on the radially outermost end of the lever, and the inward protrusion 44 of the lever 4. A skid sensing device as claimed in claim 3, characterized in that it engages a notch (45). 5 The spring 46 is connected to the first member of the one member 10.
is a tension spring that acts between the locking portion 48 of the weight 40 and the second locking portion of the weight 40, and the second locking portion passes through the pivot shaft 41 and the first locking portion 48. 4. A skid sensing device according to claim 3, characterized in that it is offset outwardly from the chord line (49).