EP3819508A1 - Conical centring pin - Google Patents

Abstract

The invention relates to a method for mounting a bearing cap housing (2) on a cylinder housing (3) comprising the following steps: - drilling 2 diametrically opposed holes (25) in the bearing cap housing and 2 holes (25) diametrically opposed in the cylinder housing, the said holes (25) of the bearing cap housing and of the cylinder housing being arranged opposite each other, - drilling of 2n-2 holes (25) in the bearing cap housing or the cylinder housing, n being the number of crankshaft bearings in the crankcase, - insertion of two centering pins (5) in two diametrically opposed holes (25) on the bonnet housing side, - insertion of conical pins (6) in the other holes (25) on the bonnet housing side, - positioning and tightening of the bearing cap housing on the cylinder housing to create an imprint on a single position element of the assembly comprising the cylinder housing (3) or the bearing cap housing (2).

Description

The invention relates to the field of mounting motor vehicle engine housings, and more particularly engine housings comprising a one-piece bearing cap housing.

These engine casings consist of a bearing cap casing and a cylinder casing. When assembling a bonnet housing with a cylinder block, it is necessary to ensure that each lower bearing zone remains centered in relation to each upper bearing zone.

If this is not ensured, a gap is created between the lower and upper bearings of the crankshaft line, which implies having a greater crankshaft-bearing clearance and therefore, ultimately, an oil pump which will consume more energy to guarantee the pressure and flow requirements of the oil circuit.

Currently, the assembly of these two elements must be done in two steps. In fact, the engine housings are made in a foundry and the bearings must be machined in the mounted engine housing then the engine housing must be removed and then reassembled in order to insert the crankshaft. To ensure correct reassembly without offset, all of the two elements are drilled after the first assembly in order to have a good alignment of the holes in the bearing cover cap with respect to those in the cylinder housing. Once the holes have been made, the two elements are removed, the crankshaft and pins are inserted into one of the two elements, then the assembly is assembled.

The existing process is complex and involves additional investments. In fact, the reassembly of the bearing cap housing with the cylinder housing requires the alignment of all the pins. It is possible to use sockets or hollow cylinders which are more flexible and which allow more latitude when inserting each pin into the opposite hole.

These pawns also allow the assembly to be held over time.

An aim of the present invention is to respond to the drawbacks of the document of the prior art mentioned above.

• perçage de 2 trous diamétralement opposés dans le carter chapeau palier et 2 trous diamétralement opposés dans le carter cylindre, lesdits trous du carter chapeau palier et du carter cylindre étant disposés en vis-à-vis,
• perçage de 2n-2 trous dans le carter chapeau palier ou le carter cylindre, n'étant le nombre de paliers vilebrequin du carter,
• insertion de deux pions de centrage dans deux trous diamétralement opposés du côté carter chapeaux,
• insertion de pions coniques dans les autres trous côté carter chapeaux,
• positionnement et serrage du carter chapeau palier sur le carter cylindre pour créer une empreinte sur un seul élément de position de l'ensemble comprenant le carter cylindre ou le carter chapeau palier.

The method of mounting a bearing cap housing on a cylinder housing according to the invention is characterized by the fact that it comprises the following steps:

• drilling of 2 diametrically opposed holes in the bearing cap housing and 2 diametrically opposed holes in the cylinder housing, said holes of the bearing cap housing and of the cylinder housing being placed facing each other,
• drilling 2n-2 holes in the bearing cap housing or cylinder housing, not being the number of crankshaft bearings in the housing,
• insertion of two centering pins in two diametrically opposed holes on the bonnet housing side,
• insertion of conical pins in the other holes on the bonnet housing side,
• positioning and clamping of the bearing cap housing on the cylinder housing to create an imprint on a single position element of the assembly comprising the cylinder housing or the bearing cap housing.

With the method according to the invention, the drilling can be done before the first assembly. On the other hand, it is not necessary to drill all the holes in the two elements of the crankcase but only two holes in one of the two elements and 2n + 2 in the other element. In fact, by virtue of their conical shape, each conical pin will create an imprint in the opposite element, an imprint which will allow the two elements to be repositioned during reassembly.

Advantageously, the conical pins protrude from 1 to 1.5 mm from the hole after assembly. This protrusion height ensures that the two elements of the engine casing are maintained when they are fitted. The protrusion is preferably 1mm.

Advantageously, the conical pins have a point forming an angle of between 60 ° and 120 ° with the axis of said conical pin. Thus the angle of the cone is a good compromise between an angle that is too sharp which can lead to a risk of the crankcase cracking and an angle that is too wide which would require too much force to maintain the two elements.

Advantageously, the pawns are cylindrical. This form is the most suitable.

Advantageously, the pawns are made of steel. Due to its hardness, steel makes it easy to make an impression on the cylinder housing or on the bearing cap housing.

According to a first variant, the position element is made of aluminum. In this case, the conical pins will preferably be in the bearing cap housing, in particular if the latter is made of cast iron. Indeed, cast iron being much hard than aluminum, it is easier to make an impression on the aluminum.

Advantageously, the cap housing is made of aluminum. In this case, the conical pins will preferably be in the cylinder block, in particular if the latter is made of cast iron. If the two parts are made of aluminum, the position of the conical pins is irrelevant.

The object of the invention also relates to an engine case obtained by the method with one of the preceding characteristics.

The object of the invention also relates to an engine comprising the above crankcase.

The above vehicle comprising an engine is also the subject of the present invention.

• [Fig.1] représente une vue en perspective d'un ensemble carter cylindre et carter chapeau palier;
• [Fig.2] représente une vue en perspective d'un carter chapeau palier de l'état de la technique;
• [Fig.3] est une coupe d'un carter chapeau palier de l'état de la technique;
• [Fig.4] est une vue en perspective d'un carter chapeau palier avec des pions selon l'invention;
• [Fig.5] montre le détail V-V de la figure 4;
• [Fig.6] montre le détail VI-VI de la figure 4;
• [Fig.7] est une coupe d'un carter chapeau palier avec des pions selon l'invention;
• [Fig.8] montre le détail VIII-VIII de la figure 7;
• [Fig.9] est une coupe du carter chapeau palier monté sur le carter cylindre selon l'invention;
• [Fig.10] montre le détail X-X de la figure 9.

Other characteristics and advantages of the present invention will emerge more clearly on reading the following detailed description of an embodiment of the invention given by way of non-limiting example and illustrated by the appended drawings, in which:

• [ Fig. 1 ] is a perspective view of a cylinder housing and bearing cap housing assembly;
• [ Fig. 2 ] shows a perspective view of a state of the art bearing cap housing;
• [ Fig. 3 ] is a section through a state of the art bearing cap housing;
• [ Fig. 4 ] is a perspective view of a bearing cap housing with pins according to the invention;
• [ Fig. 5 ] shows the detail VV of the figure 4 ;
• [ Fig. 6 ] shows detail VI-VI of the figure 4 ;
• [ Fig. 7 ] is a section through a bearing cap housing with pins according to the invention;
• [ Fig. 8 ] shows detail VIII-VIII of the figure 7 ;
• [ Fig. 9 ] is a section through the bearing cap housing mounted on the cylinder housing according to the invention;
• [ Fig. 10 ] shows detail XX of the figure 9 .

In the remainder of the description, the same references will be used for similar or identical elements.

Set 1 shown in figure 1 comprises a cylinder housing 3 and a bearing cap housing 2. The bearing cap housing 2 is placed on the cylinder housing 3 and fixed to the latter by screws 4 (here 8) in a manner known per se.

The bearing cap housing 2 of the figure 2 has four bearings 20, 21, 22, 23, each pierced with two through holes 24 intended to receive a screw 4 and two holes 25 intended to receive a centering pin 5.

The cylinder housing 3 is itself also pierced with holes (not shown) to receive the screws 4 and the centering pins 5. These centering pins 5 protrude from the hole 25 of the bearing cap housing 2 by a height do in order to fit into the holes in the cylinder block provided for this purpose.

The holes 25 are arranged near the through holes 24, and on the side opposite the bearing 20 with respect to the through hole 24.

It is easily understood that the assembly of the bearing cap housing is difficult because all the centering pins 5 must be positioned exactly opposite the corresponding hole in the cylinder housing 3.

The bearing cap housing 2 of the figure 4 differs from that of the figure 2 in that a centering pin 5 is placed in one of the two holes 25 and a conical pin 6 in the other hole 25 of the two end bearings 20 and 23. The centering pins 5 are then arranged diametrically opposed on the cap housing bearing 2. Holes 25 of the two central bearings 21 and 22 are only fitted with conical pins 6.

Each conical pin 6 protrudes by a distance d from the hole 25, d being less than do, for example d may be substantially equal to 1cm to 1.5mm. The angle α of the cone is on the figure 8 approximately 120 °, which allows the pin to catch in the surface of the cylinder block.

The cylinder block 3 according to the invention, unlike that of the state of the art indicated above, only has two diametrically opposed holes facing each other with the centering pins 5, which reduces the time and cost of manufacturing said cylinder block.

Of course, it is possible to reverse the distribution of the holes, namely in this example, provide 8 holes on the cylinder housing and only 2 on the bearing cap housing.

You can see on the figures 9 and 10 that the tips 60 of all the pins 6 will sink into the surface 30 of the cylinder housing 3, which will allow the positioning and maintenance of the bearing cap housing 2 to the cylinder housing 3.

The assembly will therefore be facilitated since there are only two centering pins to position instead of 8 in the example of the figure 2 , but the positioning and the maintenance will be satisfactory thanks to the 6 conical pins.

It will be understood that various modifications and / or improvements obvious to a person skilled in the art can be made to the various embodiments of the invention described in the present description without departing from the scope of the invention.

Claims (9)

Method of mounting a bearing cap housing (2) on a cylinder housing (3), characterized in that it comprises the following steps: - drilling of 2 diametrically opposed holes (25) in the bearing cap housing and 2 diametrically opposed holes (25) in the cylinder housing, said holes (25) of the bearing cap housing and of the cylinder housing being placed facing each other, - drilling of 2n-2 holes (25) in the bearing cap housing or the cylinder housing, n being the number of crankshaft bearings in the housing, - insertion of two centering pins (5) in two diametrically opposed holes (25) on the bonnet housing side, - insertion of conical pins (6) in the other holes (25) on the bonnet housing side, - Positioning and tightening of the bearing cap housing on the cylinder housing to create an imprint on a single position element of the assembly comprising the cylinder housing (3) or the bearing cap housing (2). Method according to the preceding claim, characterized in that the conical pins (6) protrude from 1 to 1.5mm from the hole after assembly. Method according to one of the preceding claims, characterized in that the conical pins (6) have a point forming an angle α of between 60 ° and 120 ° with the axis of said conical pin. Method according to one of the preceding claims, characterized in that the pins (5, 6) are cylindrical. Method according to one of the preceding claims, characterized in that the pins (5, 6) are made of steel. Method according to one of the preceding claims, characterized in that the position element (3,2) is made of aluminum. Carter obtained by the process according to one of the preceding claims. Motor comprising the housing according to the preceding claim. Vehicle comprising an engine according to the preceding claim.

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