FI79268C - Towbar for a trailer fitted with a hydraulic brake for passenger cars - Google Patents

Description

1 79268

Towbar for a passenger car with a liquid brake trailer

The invention relates to a drawbar for a liquid brake trailer for a passenger car.

The invention uses, as known components, a passenger car brake master cylinder with a fixed brake fluid reservoir above it and a conventional ball head switch.

The invention makes it possible to use disc brakes in a car trailer with 10 brakes, e.g. caravans, trailers, etc., which require a total weight of more than 750 kg, which are practically always hydraulic.

The advantages of hydraulic disc brakes in cars compared to 15 drum brakes are known, but their advantages are even more pronounced in trailer use; such as the rusting of the brakes during the winter stand of the caravan, which causes difficulty in dismantling, or the immersion of the boat trailer in the lake several times a day when the boats are being raised and lowered.

20

The previously known disc brake drawbar arrangement for a passenger car trailer is a Swedish electromagnetic structure implemented with a variable sliding resistor connected to the car's own brake circuit, which requires an additional electrical plug for the trailer, which includes brake actuation and control electricity.

Therefore, it cannot be accepted, for example, for cross-connection in accordance with the Finnish Road Traffic Act, as the invention presented.

The advantage of the invention is the possibility to switch to the use of drum brakes te-30 more efficient, balanced, easier to maintain, i.e. safer disc brakes in the braked trailer of a passenger car in the cross-connection. The invention is characterized by what is stated in the claim.

The structure and operation of an embodiment of a drawbar of a liquid-braked trailer according to the invention will become apparent from the following description, in which the structural drawing must be followed at the same time.

Figure A is a top view of the invention and Figure B is a side view of the parking brake. The reference numbering is the same in both figures.

2 79268

Towing a trailer: 5 When the ball head switch 1 is connected to the car and the trailer is pulled through the flange 19 at the end of the first brake reaction arm 5, the traction passes through the brake outer tube A to the trailer and the trolley moves forward.

Braking the car:

The first brake reaction arm 9 moves in the direction B, the movement is damped by a damping spring 6, because the sliding shaft 14 is fixedly arranged in the body of the trailer. In this case, the brake reaction flange 18 also moves in the direction B, which acts via the second brake reaction arm 16 on the brake master cylinder 15, whereby the trailer brakes. The thinning at the end of the sliding shaft 14 limits the movement so that the brake master cylinder 15 does not disintegrate.

Reversing the car: 20 Rotate the ball head switch 1 about its longitudinal axis in direction C until the reversing latch 23 opening by the reversing latch release spring 20 can be pressed between the ball head switch body 1 and the outer tube 4 and rotate the ball head switch 1 back in direction D around its longitudinal axis.

The function of the reversing latch tension springs 8 during reversing is to keep the brake reaction arm 5 tightened in direction B, so that the reversing latch 23 cannot escape from under the reversing latch locking tongue 2, but if the car is moved in direction A, the reversing latch tension springs 8 also reduce the reversing latch release by about 3 mm. 30 between the screen latches 23 automatically as required by current inspection requirements.

Using the parking brake:

The handbrake reaction rod 24 connected to the brake reaction flange 18 acts 35 when the handbrake 27 is pulled directly on the brake master cylinder 15 and the handbrake boost spring 25 is pinched between the nut 26 and the free hole in the brake reaction flange 18, increasing the brake in the event of a small fluid leak. When the parking brake rod 24 is in the free hole 0 10 mm of the brake reaction flange 18, normal braking does not affect the parking brake.

3 79268 5 Safety cable: The parking brake safety cable 9 is connected to the car due to a possible breakage of the towbar, which moves in the safety cable operating tube 10 by pulling on the lockable parking brake 27, whereby the trailer stops automatically.

10 The parking brake limiter sleeve 13 is preventing damage to the brake master cylinder 15 when removing the trailer from the car, e.g. due to the parking brake cable 9 getting caught.

15

Claims (1)

“79268 CLAIM that three cross-beams (28, 29, 30) are welded between the arms of the A-shaped rod, the outer tube (4) of the telescopic structure being welded in the middle of the two front ones, the first brake reaction arm (5) being chromed on top with a sliding inner part the ball head coupling (1) is bolted and a flange part (19) is welded to the other end, from which part of the flange is machined at the bottom and top edge, the remaining counter-wings corresponding to the tension-15 springs (8) of the reversing latch (23) inside the middle beam (29), the tension springs (8) pushing the first brake reaction arm (5) backwards r the distance set by the timer bolts (7) by tightening between the ball head switch (1) and the outer tube (4) when reversing, rotating the brake reaction lever (5) 30 ° relative to the drive body (4), mounting the reversing latch (23) on the ball head switch (1) under the locking tongue (2), which prevents the reversing latch (23) from rising when reversing and pulling forward, the tension springs (8) follow the distance of the reversing latch locking tongue (2) on the reversing latch (23), whereby the reversing latch release spring (20) automatically raises the reversing latch (23) away between the outer tube (4) and the ball head switch (1) and that the brake reaction arm (5) has a hard chrome-plated sliding shaft (14) bolted to the rear cross member (30) inside the flange side end against the ball head switch (1) ), a prestressed spring (6) of longitudinal movement 30 and a longitudinally moving brake reaction flange (18) around the sliding shaft (14) are restored. springs (11) and that the brake reaction flange (18) is affected by the braking of a vehicle towing through a telescopic structure or by a handbrake (27) on a drawbar (24) with a free hole drilled in the upper 35 side of the brake reaction flange (18) and that the brake reaction flange (18) transfers the longitudinally movable brake reaction arm (16) to a brake master cylinder (15) bolted to the rear crossmember (30) laterally from the centerline of the drawbar. 5 79268 Dragstäng för en med hydraulisk broms försedd släpvagnör for Personbilar, vilken dragstang bestär av en A-formig släpvagstang, ett vid denna fast telpopygt telescopiskt dragparti med en kulhuvudkoppling (1) i drag-ändan och en bromshuvud , which is designed to be fitted with an A-shaped headform to a three-dimensional (28, 29, 30), and to provide a cross-section with a telescopic construction (4) ytan förkromad första bromsreaktionsstäng (5), vars dragända har bultats ihop med en kulhuvudkoppling (1) och i den andra ändan har svetsats fast en flänsdel (19) frän vilken genom ma-skinell bearbetning avlägsnats en del av övre och undre kanten för an some of the uppermost skates are used in connection with the backscatter (23) spannfjadrar (8) som finns sänkta inuti den mittersta balken (29), varvid spännfjädrarna (8) skjuter den första bromsreak-tionsstängen (5) bakä t at sträcka som bestäms av begränsarbultar (7), och den backs pärr (23) som skall klämmas fast anordnas mellan kulhuvud-kopplingen (1) ochterteröring (4) genom 30 ° vridning av bromsreak-tionsstangen (5) i förhällande tildrmaskin (4), varvid backskerren bringas under en lastunga (2) som finns i anslutning account kulhuvudkopplingen (1) och som hindrar upplyftning av backsekvren (23) under backning, Medan under drag spännfjärarna (8) ger efter den sträcka som backskerrens lastunga (2) ) overhead backrests (23), varvid back-spärrens utlösningsfjäder (20) automatic lyft uppacks (23) free of charge (4) ochuvudopplingen (1), och att i bromsreaktiosstängen (5), inuti fläns tines (30) bolts, cradles for glidexel (14) shafts for crankshafts (1) crankshaft star mot in other braking reaction chambers (5) presses, sloping dampers (6), and hose brakes (14) längdriktningen rörlig bromsreak-