JPH026262Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of supplying lubricating oil to the connecting rod of a crankshaft pin mounted on a V6 engine of a small, medium, or large vehicle.

Therefore, this idea is based on the structure of the crankshaft installed in the 60° V-type six-cylinder engine installed in the above-mentioned small, medium, and large automobiles between the front end journal and the end journal. This invention relates to an engine crankshaft structure in which oil holes for lubricating oil to pins for a plurality of connected rod bearings are connected in communication from a journal, and in particular, only one adjacent pin from the journal at the front end and end is connected. A pair of oil holes from the journal between these holes is provided for each of the two pins on both sides, increasing the diameter of the oil hole and increasing the oil hole outlet of the pins on both sides. This invention relates to an engine crankshaft structure in which lubricating oil can be uniformly distributed and supplied to each pin by forming elongated holes in the circumferential direction.

<Prior art> As is well known, automobiles are equipped with engines. For example, small, medium-sized, and large-sized cars have engines.
A so-called V6 engine with six cylinders in a 60° V-type arrangement is provided, and its crankshaft 1 is formed as shown in FIG.

That is, the first to fourth journals 21, 22, 23, and 24 for the crankshaft bearing are provided from the left side to the right side in the figure, and the first to ninth counterweights 61 are provided between them. ,62,63,64,
Arm 3 with 65, 66, 67, 68, 69
1, 32, 33, 34, 35, 36, 37, 3
Pins 41, 42, 43, 44, 45, and 46 are integrally connected to the connecting rod bearings through pins 8 and 39, respectively.

A mounting surface 6 for the flywheel 5 is integrally formed at the rear of the fourth journal 24 at the end.

When the so-called 9-balance mode in which each of the nine arms has a counterweight is schematically shown, the outline in the longitudinal direction is as shown in FIG. 2, and the aspect in the axial direction is as shown in FIG. 3. can be made into

As shown in Fig. 2, the mass of the counterweight attached to cancel the inertial couple due to the rotating reciprocating mass is represented as a vector of inertial force in Fig. 3, and the 1st and 9th The second, fifth and eighth counterweights 62, 65 and 68 are arranged in equal amounts at 120° intervals. Similarly, it is canceled out by three, and
The third, sixth, fourth, and seventh counterweights 63, 66, 64, and 67 are arm 3
Since they are arranged symmetrically and equally in five directions, they are also canceled out by four, and therefore the overall balance of the inertial force due to the rotating mass is reliably maintained.

As shown in FIG. 1, oil holes 71 in each journal are used to supply lubricating oil to each independent throw type pin for a connecting rod bearing (not shown).
Oil holes 81, 8 from 72, 73, 74 to each pin
2, 83, 84, 85, and 86 are connected.

<Problem to be solved by the invention> However, in the conventional V6 engine crankshaft structure described above, the oil holes 71 and 74 of the front end journal 21 and the end journal 24 are connected to the first and sixth pins 41. , 46 oil hole 8
1 and 86 are connected, while the intermediate journals 22 and 23 are connected to two adjacent pins 4.
Oil holes 82, 83 to 2, 43, and 44, 45,
and 84, 85 are branched and connected from the oil holes 72, 73.

Therefore, the first and sixth pins 41,
Compared to the amount of lubricant supplied to pin 46,
There is an inconvenience that the amount of lubricating oil supplied to 3, 44, and 45 may decrease, and it is difficult to solve this problem by simply widening the oil hole outlet. There was a problem where it could not follow the area.

The purpose of this invention is to solve the problem of lubricating oil distribution imbalance from the journal to the pin of the crankshaft of an automobile engine based on the above-mentioned conventional technology as a technical problem to be solved, and to solve this problem by making use of the allowance for setting the oil hole path. While making full use of the lubricating oil, increase the supply amount connected to the branch oil hole for pins that lack the supply amount, and also increase the discharge amount at the outlet so that the lubricating oil can be evenly distributed and supplied to each pin. The object of the present invention is to provide an excellent engine crankshaft structure that is beneficial to the application field of drive system technology in the automobile industry.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the structure of this invention, which is based on the above-mentioned claims for utility model registration, is to provide a plurality of pins and journals between the front end journal and the end journal. In an engine crankshaft structure in which the pins are connected through arms and the oil holes of the journals are connected, the oil holes of the journals at the front end and the end are connected only to the oil hole of each adjacent pin, The oil holes in the middle journal are adjacent to the oil holes in each of the two adjacent pins, and the oil hole outlets of the pins other than the front and end pins are formed into circumferentially elongated holes. This is an engine crankshaft structure in which the diameter of the oil hole from the journal to each pin is larger than the diameter of the oil hole from the journal at the front end and end to the adjacent pin.

<Operation> Therefore, the lubricating oil is supplied from the journals at the front end and the end of the crankshaft, as in the conventional case.
The diameter of the oil hole in the journal between these journals is made larger than that of the journal at the front end and the end to increase the amount of lubricating oil supplied, and The oil holes of the two pins connected and extended are communicated with each other, and the exits of the oil holes are formed as long circumferential grooves to discharge a large amount of lubricating oil, thereby making the amount of lubricating oil uniformly discharged from all the pins. Technical measures have been taken to make it possible.

<Embodiment> Next, one embodiment of this invention will be described as follows based on the drawings from FIG. 4 onwards.

Note that the same parts as in FIGS. 1 to 3 will be described using the same reference numerals.

Therefore, this embodiment shows an aspect of 5 balances as opposed to the conventional 9 balances.

As shown in FIG. 4, in the crankshaft of this invention, counterweights are not provided for the third, fourth, sixth, and seventh arms 33, 34, 36, and 37; The counterweights 61 and 69 for the first and ninth arms 31 and 39 are made to have the same shape, the same weight, and the same section coefficient, so that they are balanced by only the two, and
2nd, 5th, and 8th three arms 32, 35, 3
8, the counterweights 62, 65, 68 have the same weight, the same shape, and the same section modulus because they are arranged line symmetrically with respect to the arm 35 and are arranged every 120° in the circumferential direction. are provided to achieve balance with just these.

The directions and shapes of these arms and counterweights are as shown in FIGS. 6 to 14 when viewed from the front in the axial direction.

Therefore, in FIGS. 8, 9, 11, and 12, the counterweight is not provided and the arm 3
A mode in which only 3, 34, 36, and 37 are attached is shown.

Regarding the weight of each counterweight, the 1st and 9th including the arm are the largest, the 3rd, 4th, 6th, and 7th (each arm only) are the smallest, the 2nd, 5th, The eighth one is placed between the two.

The section modulus is set in the same size arrangement group as the above-mentioned weight.

As shown in FIG. 5, the oil holes 71, 74 of the journals 21, 24 at the front end and the end, the adjacent first and sixth oil holes 81, 86, and the pin 41, 46 oil hole outlets are formed to the same size as conventional ones.

On the other hand, the second and third journals 2
The 2nd and 23rd oil holes 72' and 73' have a set amount larger diameter than the 1st and 4th oil holes 71 and 74 (for example, 2nd and 23rd oil holes 72' and 73'
However, the diameters of the oil holes 72' and 73' in the second and third journals 22 and 23 have been determined by experiment and theory to ensure that the amount of lubricating oil discharged from all oil hole outlets is uniform. Decide to be.

The second, third, fourth, and fifth pins 42 and 4 adjacent to the first and sixth pins 41 and 46
Connection oil holes 82, 83, 84 to 3, 44, 45,
85 has the same diameter as the oil holes 81 and 86, and the oil hole outlet 9
2', 93', 94', and 95' are in the shape of long holes in the circumferential direction, and the oil hole outlets 91, 96 are round holes of the same size as the conventional oil hole.

And the second and third journals 22, 23
The extraction hole inlets are the first and fourth journals 21 and 2.
The size is set to be larger than those of No. 4.

Note that the oil hole outlets 92', 93', 94', and 95' may be machined by casting, machining, or other appropriate chamfering, and it is sufficient that the long holes have a large oil film thickness.

In the above configuration, when the engine (not shown) is operated and the crankshaft 1 is rotated, as described above, in this invention, the crankshaft 1 has each arm,
In addition, since the balance of the counterweight as a whole is maintained accurately, no unbalanced vibration occurs and the rotary drive is performed normally.

Since no counterweights are attached to the third, fourth, sixth, and seventh arms 33, 34, 36, and 37, weight reduction is achieved.
Therefore, the natural frequency of the torsional vibration increases accordingly, and the rotation of the engine can be increased to a high rotation range.

Even in the high rotation range, the design allows sufficient margin for main bearing surface pressure and bending moment to be maintained.

Therefore, during the rotation of the crankshaft 1, especially during high speed rotation, the first and sixth oil hole outlets 91,
A set amount of lubricating oil is discharged from 96 as in the conventional case, but the oil holes 72' and 73' of the second and third journals 22 and 23, and the oil hole entrances are similar to those of the first and fourth journals 21. , 24, the adjacent pins 42, 43 and 44, 4
Oil holes 82, 83 to 5, and oil holes 81, 86 to 1st and 6th pins 41, 46 to 84, 85.
Therefore, lubricating oil is uniformly discharged from all oil hole outlets.

This is effective for high-speed rotation, and the above-mentioned 5
Good discharge of lubricating oil from the inward oil hole outlet of the balance is ensured, and seizure of the conrod bearing is prevented.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted, such as being applicable to an 8-cylinder engine, a 4-cylinder engine, etc.

<Effects of the invention> According to this invention, basically, lubricating oil can be evenly supplied to all oil holes in the crankshaft, so the lubricating oil for the conrod bearings of each pin is optimal. This has an excellent effect of preventing seizure of the bearing in a high load area.

This is particularly effective in high-speed operation when the weight of the crankshaft is reduced, such as in the above-mentioned 5-balance type.

Thus, the oil holes of the front and end journals are connected to the oil holes of only one adjacent pin, whereas the oil holes of the middle journal are connected to the oil holes of only one adjacent pin.
By making the oil hole in the middle journal larger than the oil hole in the front and end journals, the amount of lubricating oil on the supply side can be increased. It is possible to guarantee that the same amount of lubricating oil is supplied to the branched oil holes for adjacent pins as the oil holes at the front end and the end, which has an excellent effect of ensuring that the amount of lubricating oil is reliably equalized. There is.

In addition, it is not difficult to process and has the excellent effect of reducing costs.Furthermore, by increasing the diameter of the oil hole in the inner journal, the amount of material used is correspondingly smaller and costs can be reduced. .

Furthermore, smooth rotation improves fuel efficiency and has the excellent effect of improving acceleration response when starting.

In addition, since the structure is simple, maintenance and inspection work is easy, and excellent serviceability is achieved.

A secondary effect is that the engine frequency can be increased to a higher range.

[Brief explanation of drawings]

Fig. 1 is a schematic partial cross-sectional side view of a crankshaft based on the prior art, Fig. 2 is a schematic side view of the arrangement of journals, pins, arms, and counterweights of the same crankshaft, and Fig. 3 is an axis of the arm and counterweight. A schematic diagram of the circumferential arrangement balance in direction, Figure 4 and the following are explanatory diagrams of one embodiment of this invention, Figure 4 is a schematic diagram equivalent to Figure 3, Figure 5 is a partially enlarged perspective side view of the crankshaft, 6 to 14 are sectional views taken from - to - in FIG. 5. 1...Crankshaft, 21, 22, 23,
24... Journal, 31, 32, 33, 34,
35, 36, 37, 38, 39...Arm, 4
1, 42, 43, 44, 45, 46...pin, 8
1, 82, 83, 84, 85, 86, 71, 7
2', 73'...Oil hole, 91, 92, 93, 94,
95, 96...Oil hole outlet.

Claims (1)

[Scope of utility model registration request] In an engine crankshaft structure in which a plurality of pins and journals are connected between a front end journal and a terminal journal via arms, and the pins are connected to oil holes from the journals,
The oil holes of the front and end journals are connected to only the oil holes of one pin of each adjacent pin, and the oil holes of the middle journal are adjacent to the oil holes of two pins of each adjacent side, so that The oil hole exits of the pins other than the pins are formed into long holes in the circumferential direction, and the oil hole diameter from the intermediate journal to each pin is made larger than the oil hole diameter from the front end and terminal journals to the adjacent pins. The engine crankshaft structure is characterized by: