CN87103394A - Speed mileometer with instantaneous velocity writing function - Google Patents

Abstract

The employed speed mileometer of a kind of motor vehicles with record instantaneous velocity function.Utilize inertia pendulum and the self-locking action of cam lever clutch when speed die-offs, speed indicator is locked in the starting velocity place of die-offing, and can after vehicle recovers cruising, returns to normal.It is the instrument of the objective judgement vehicle of a kind of energy speed under abnormal condition.

Description

The invention belongs to the measuring instrument of motor vehicles, particularly road vehicles, as all kinds of automobiles and the employed speed mileometer of motorcycle.

The common employed speed mileometer of motor vehicles, as the CA-10 type, the principle of work of indication Vehicle Speed, be to rotate by the magnet steel (32) on wheel shaft (29) the drive instrument main shaft (31) of rotation, go up generation induction current and deflecting torque at magnetic field induction dish (27), drive pointer (22) deflection by pointer shaft (35); And the hairspring (33) of pointer shaft (35) forms opposing torque along with the generation of deflecting torque, when these two reciprocal moments are in mobile equilibrium, pointer i.e. no longer deflection, and it can indicate the rotating speed or the speed of a motor vehicle of this moment at the scale of speed mileometer panel present position.

Common employed this speed mileometer, when Reduced Speed Now or parking, reduce or stop because the rotating speed of flexible axle (29) is corresponding, the also corresponding minimizing of induction current on the magnetic field induction rotating disk (27) or be zero, thereby the also corresponding minimizing of deflecting torque or be zero, and under the opposing torque effect of hairspring (33), pointer (22) is deflection or answer zero-bit oppositely.

The speed mileometer of working under this principle only is suitable under the cruising condition simple each instantaneous speed of a motor vehicle of indication, and can not get into an accident and during other mishap, provide the data information of the relevant speed of a motor vehicle of accident moment for on-site land survey.Thereby be difficult to assist the reason of judgement accident comprehensively and objectively.

The objective of the invention is to realize road speed die-off when surpassing predetermined limit record the die-off initial velocity of moment and the method for removing this record.

The present invention utilizes one group of inertia pendulum and cam-and-to realize.Entity of the present invention is a device with the record instantaneous velocity of movement overall package within a shell of speed mileometer.Its main body is a pendulum (3) with certain mass, owing to be subjected to pining down of extension spring (6), only at acceleration absolute value that retarded motion produced during greater than a certain particular value, the inertial force that is produced could move on to its self-locking position with pendulum (3).The pendulum latch hook (17) that have cam function this moment locks pendulum (3), stir lever (20) simultaneously, to block with the gear (26) that pointer (22) are connected as a single entity, the counter torque that stops hairspring (33) is with pointer (22) return-to-zero, thereby the position that in fact also just pointer (22) speed of being locked in is begun to die-off, the purpose of initial velocity when reaching writing speed and die-offing.

For removing the recording status of speed indicator (22), one follower gear (5) that has ejector pin (12) and (8) is housed on pendulum (3), when pendulum (3) self-locking, follower gear (5) is meshed with driving gear (14) on being contained in mileometer integrating note journey kinematic train worm-wheel shaft (13).When vehicle normally moves again, drive follower gear (5) rotating certain angle that is loaded on the pendulum (3) by the driving gear (14) on the worm-wheel shaft (13), make ejector pin (12) or (8) on it back down pendulum latch hook (17), so pendulum (3) resets under the effect of extension spring (6), speed indicator (22) also recovers normal operating conditions again because of lever (20) discharges the fast gear of lock (26).

The present invention is because the mechanism that adopts is simple, and is encapsulated in the housing, so can install and use according to conventional method.Owing to increased the function of record instantaneous velocity when speed die-offs, thereby provide objective and just means for strengthening traffic superintendance and analyzing the accident reason.

Below in conjunction with an accompanying drawing and a specific embodiment of the present invention, the present invention is described in further detail.

Fig. 1 is the axial section of a specific embodiment of the present invention.

13 is worm-wheel shafts among the figure, the 14th, and driving gear, the 22nd, pointer, the 23rd, the speed mileometer panel, the 24th, the mileage number code wheel, the 25th, pull out wheel for a short time, the 26th, lock fast gear, the 27th, the magnetic induction rotating disk, the 28th, frame is installed, the 29th, driving snake, the 30th, hold-doun nut, the 31st, main shaft, the 32nd, magnet steel, the 33rd, hairspring, the 34th, lock fast reed, the 35th, the pointer rotating shaft.

Fig. 2 is the front elevation that has part section of a specific embodiment of the present invention.

1 is installation base plate among the figure, the 3rd, and pendulum, the 5th, follower gear, the 13rd, worm-wheel shaft, the 17th, pendulum latch hook, the 20th, lock fast lever, the 23rd, the speed mileometer panel, the 26th, lock fast gear, the 28th, frame is installed, the 33rd, hairspring, the 34th, lock fast reed, the 36th, worm screw, the 37th, radome.

Fig. 3 is the detail drawing of pendulum cam lever clutch locking mechanism in the specific embodiment of the present invention.

1 is installation base plate among the figure, the 2nd, and oscillating weight axle, the 3rd, pendulum, the 4th, banking pin, the 5th, follower gear, the 6th, pendulum extension spring, the 7th, pendulum extension spring nail, the 8th, ejector pin, the 9th, the moving nail of return spring, the 10th, the follower gear return spring, the 11st, return spring is followed closely surely, and the 12nd, ejector pin, the 13rd, the worm-wheel shaft in the mileage integrating kinematic train, the 14th, driving gear, the 15th, lock pin, the 16th, lock hook shaft, the 17th, pendulum latch hook, the 18th, lock fast lever torsion spring, the 19th, lock fast lever shaft, the 20th, lock fast lever, the 21st, spacing eccentric wheel, the 34th, lock fast reed, the 38th, screw.A is a direction of traffic, and B is the direction of motion that returns to normal, and C is the direction of motion that starts the writing speed function.

The left side of the frame of speed mileometer movement (28) is equiped with the substrate (1) that the basis is installed as the instantaneous velocity recording mechanism, and pendulum (3) nationality helps oscillating weight axle (2) to be installed on the substrate (1).Owing to be subjected to pining down of banking pin (4) and pendulum extension spring (6), under the cruising condition, pendulum (3) is in the original position of near vertical.When the inertial force that has only the speed of a motor vehicle to die-off to produce was enough to overcome the pulling force of extension spring (6), pendulum (3) could be forward, the direction of promptly driving a vehicle A, along clockwise direction around oscillating weight axle (2) toward C to deflection.Have cam function, have the pendulum latch hook (17) at peak shape top, nationality helps lock hook shaft (16) to be contained in (1) on the substrate.Under the cruising condition, be in the position of almost horizontal because of the qualification pendulum latch hook (17) that is subjected to lock pin (15).When the speed that die-offs when the speed of a motor vehicle surpassed a certain limit value that pendulum extension spring (6) sets, pendulum (3) was enough to make the lock pin (15) on it to be under the hook groove of pendulum latch hook (17) along C to swing clockwise.So pendulum latch hook (17) hooks the lock pin (15) of pendulum (3) because of the effect of locking fast lever torsion spring (18) and deadweight thereof produce clockwise along C to deflection, making it can not be along B to putting back original position.And and make the fast lever of lock (20) in its deadweight with lock under the effect of fast lever torsion spring (18) clockwise along C to deflection, the lock speed reed (34) that its front end is fixed in drive moves downward, block the lock speed gear (26) that is fixed together with speed indicator rotating shaft (35), reach speed indicator (22) is locked in the original position of the speed of a motor vehicle when die-offing.Simultaneously, be installed in the follower gear (5) on the pendulum, also with pendulum (3) along C to deflection and be meshed with driving gear (14) on being installed in mileage integrating kinematic train.

After vehicle recovered cruising again, speed mileometer main shaft (31) drove driving gear (14) by worm-wheel shaft (13) and rotates, and the follower gear (5) that has been engaged with is rotated.After vehicle recovers the cruising certain distance, follower gear (5) is also corresponding to turn an angle, make ejector pin (12) on it or (8) with pendulum latch hook (17) jack-up upwards, make it to lift lock fast lever (20) to deflection along B, discharge lock fast gear (26), pointer (22) reverts to the duty of normal indication heavily again.Meanwhile, pendulum (3) also returns to the normal position to B to deflection under the effect of pendulum extension spring (6).Follower gear on it (5) also separates with driving gear (14) thereupon, and And is returned to original position under the effect of follower gear return spring (10).

The purpose of installing two ejector pins (12) and (8) is to consider no matter be into car or reversing, can make pendulum latch hook jack-up, so that the instantaneous velocity pen recorder returns to normal rapidly.

The mechanism of record instantaneous velocity of the present invention can carry out multiple adaptive adjusting as requested.As choose the different elastic force of pendulum extension spring (6), but the minimum initial inertial force of setting recording instantaneous velocity.That is it is required to define startup instantaneous velocity writing function, the minimum acceleration absolute value of retarded motion.Also can take this to adapt to different instrument setting angles; Choose the different elastic force of the fast lever torsion spring of lock (18), the action response speed of adjustable complete record instantaneous velocity mechanism and lock fast reed (34) and lock action impulse force between fast gear (26); Adjust the layout of ejector pin (8) and (12) on follower gear (5), can change the speed that the instantaneous velocity recording mechanism returns to normal; Regulate the angle that is fixed on the spacing eccentric wheel (21) on the substrate (1) with screw (38), can adjust the impulsive force of engagement when meshing between follower gear (5) and driving gear (14) etc.

Claims (3)

1, a kind of speed mileometer of motor vehicles is characterized in that being provided with the device that utilizes inertia record instantaneous velocity.This device main body is by one group of acceleration absolute value when retarded motion during greater than predetermined value, and the cam lever clutch that is self-locking in the pendulum of ad-hoc location and the starting velocity sign value place that the speed indicator speed of being fixed on die-offs because of inertia motion is formed.

2, the described speed mileometer of claim 1 is characterized in that being provided with and makes speed indicator recover normal operating conditions, has the mileage integrating kinematic train that the gear drive cam resets.

3, claim 1 and 2 described speed mileometers is characterized in that a kind of being convenient to install, and are encapsulated in the one-piece construction in the casing.

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