JP2572820Y2 - Compression lubrication system for rotating balancer shaft of engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurized lubricating device for a rotating balancer shaft of an engine.

[0002]

Basic structure of the invention The basic structure of a pressure-feed lubrication device for a rotary balancer shaft of an engine is constructed as shown in FIGS. 1 and 5, for example. That is, a pair of balancer bearing bosses 12a and 12b are fixed to the engine at an appropriate distance from each other,
Each bearing hole 13 of each balancer bearing boss 12a, 12b
The shaft ends 21a and 21b of the balancer shaft 21 are provided at a and 13b.
Is rotatably fitted inside each slide bearing 25, and a balance weight 30 is fixed to the balancer shaft 21 between the balancer bearing bosses 12a and 12b,
Among the bearing holes 13a of the balancer bearing boss 12a of one of the pair, an oil inlet chamber 14 is formed in a bearing hole portion located outside the shaft end 21a of the balancer shaft 21. Introduced oil passages 22 and 23 for guiding the pressure-fed oil to the slide bearing 25 of the other balancer bearing boss 12b are formed inside the balancer shaft 21.

[0003]

2. Description of the Related Art In the basic structure described above, the oil inlet chamber 14 conventionally has a bearing hole 13a formed through one balancer bearing boss 12a as shown in FIG. It was formed by driving the driving plug 14a to close the end of the bearing hole. Note that reference numeral 10 in FIG.
Denotes an entire rotation balancer of the engine, and 11 denotes a balancer case in which the balancer bearing bosses 12a and 12b of the rotation balancer 10 are integrally formed.

[0004]

In the oil inlet chamber 14 of the above-mentioned conventional example, the end of one of the bearing holes 13a formed therethrough is closed by a driving stopper 14a. When bad conditions are overlapped due to abnormally weak fitting / fixing force or abnormally high internal pressure of the oil inlet chamber 14, the spigot 14a comes off and oil leaks out, and the balancer shaft The ten sliding bearings 25 may not be lubricated, and the sliding bearings 25 may seize. The present invention has been made in consideration of such circumstances.
It is an object of the present invention to eliminate seizure of the slide bearing 25 due to the detachment of the slide bearing 4a.

[0005]

According to the present invention, in order to solve the above-mentioned problems, there is provided an improved lubricating device for a rotary balancer shaft of an engine having the above-mentioned basic structure. That is, the one balancer bearing boss 1
The bearing hole 13a in 2a is formed in the shape of a blind hole ending partway without being penetrated, and the oil inlet chamber 14 is formed in the blind hole portion of the blind hole-shaped bearing hole 13a. It is.

[0006]

[Functions and effects of the present invention] The present invention has the following functions and effects by being configured as described above. That is, the oil inlet chamber 14 is provided with the bearing hole 13a in the balancer bearing boss 12a.
Can be formed by extending the boring process to the back of the insertion region of the shaft end 21a of the balancer shaft 21 to form a blind hole. Therefore, it is not necessary to separately perform drilling or the like only for forming the oil inlet chamber 14. Further, since there is no need to use the driving stopper 14a as in the conventional example, there is no need to perform the operation of driving the driving stopper 14a. As a result, the manufacturing process can be shortened, and the manufacturing cost can be reduced. In addition, since the oil inlet chamber 14 is formed in the bag-like deep hole of the blind hole-shaped bearing hole 13a in which the bearing hole 13a is formed in a blind hole shape, even if the internal pressure of the oil inlet chamber 14 becomes high, Oil inlet chamber 1
The oil in 4 does not easily leak to the outside. As a result, the oil passes through the introduction oil passages 22 and 23 and reaches the balancer bearing boss 1.
The sliding bearing 25 of 2a and 12b can be reliably reached to lubricate the sliding bearing 25 and seizure of the sliding bearing 25 can be reliably prevented. In addition, because of the oil inlet chamber 14,
The back wall of the blind hole-shaped bearing hole 13a and the shaft end 2 of the balancer shaft 21
This makes it possible to reliably prevent interference between the inner wall of the blind hole-shaped bearing hole 13a and the shaft end 21a of the balancer shaft 21 due to manufacturing errors.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in more detail with reference to the drawings. FIG. 1 shows an engine rotation balancer according to an embodiment of the present invention, and FIG.
(B) is a vertical sectional front view taken along the line BB in FIG. A, FIG. 2 is a side view showing a state where the rotary balancer is assembled to the engine, and FIG.
FIG. 4 is a vertical sectional front view showing an assembled state of the rotary balancer to the engine, and FIG. 4 is a cross-sectional plan view taken along line IV-IV in FIG. Note that reference numeral 10 denotes a rotation balancer of the engine.

[0008] The rotary balancer 10 is assembled in a balancer case 11. As shown in FIGS. 2 and 3, the balancer case 11 includes four case hanging arms 17 extending upward and two front and rear upper half intermediate walls 2 in the two-split crankcase 1 of the engine E. (2), and four fixing bolts 18 are penetrated upward through the case suspension arm 17 and are suspended from the upper half intermediate wall 2. 2 and 3, reference numeral 3 denotes the lower half of the split crankcase 1, 4 denotes an oil pan, 5 denotes a crankshaft, 6 denotes a crankpin, 7 denotes a counterweight,
8 is a bearing cap for supporting the crankshaft 5 from below, and 8a is a fixing bolt for the bearing cap 8.

As shown in FIGS. 1 and 4, the rotating balancer 10 has a balancer case 1 inside a balancer case 11.
1 and two pairs of balancer bearing bosses 12a and 12b, which are formed integrally with each other and arranged at an appropriate distance from each other,
Each bearing hole 13 of each balancer bearing boss 12a, 12b
a and 13b, each balancer shaft 21 rotatably supported by a slide bearing 25 via a slide bearing 25, and each balancer shaft 21
A set of balancer gears 26 fixed to one end of 21
26, a balance weight 30 fixed to each balancer shaft 21 between both balancer bearing bosses 12a and 12b,
As shown in FIG. 2, the transmission gear 9 fixed to the crankshaft 5 of the engine E includes one balancer gear 26a.
The transmission rotation of each of the balancer shafts 21
Is rotated to eliminate the secondary vibration of the engine E. Reference numeral 19 in these figures denotes a rear case lid of the balancer case 11 for facilitating the assembly of the rotary balancer 10.

The above-mentioned pressure-feeding lubricating device 40 for the balancer shaft includes:
As shown in FIGS. 1 and 4, each of the oil inlet chambers 14, 14 formed by a bearing hole located outside the shaft end 21 a of each balancer shaft 21, and each of the oil inlet chambers 14.
14 comprises an oil pressure oil supply passage 15 for supplying oil to the pump 14 and introduction oil passages 22 and 23 formed inside the balancer shafts 21. One of the upper half intermediate wall 2 of the engine E and one of the balancer cases 11 is provided. An oil pressure oil supply passage 15 is formed between the case suspension arm 17 and the case wall, and the oil pressure-fed to the oil inlet chamber 14 is supplied to each balancer bearing boss 12.
The slide bearing 25 is configured to be guided to the sliding bearing 25 of a.12b.

Each of the oil inlet chambers 14 is formed with a bearing hole 13a in the one balancer bearing boss 12a in the form of a blind hole that terminates on the way without penetrating. It is formed in a deep hole. That is, even if the internal pressure of the oil inlet chamber 14 becomes abnormally high, the oil in the oil inlet chamber 14 does not leak, and passes through the introduction oil passages 22 and 23 to provide the balancer bearing bosses 12a and 12b.
The sliding bearing 25 reaches the sliding bearing 25b and always lubricates the sliding bearing 25. Thus, seizure of the slide bearing 25 is eliminated, and the driving operation of the driving plug 14a can be omitted.

It should be noted that the present invention is not limited to the case where the rotary balancer is assembled in the balancer case, but it is sufficient that the balancer bearing boss is provided at any part of the engine. Also, regarding the arrangement of the oil pressure oil passage,
It is not necessary to say that it can be implemented with appropriate changes.

[Brief description of the drawings]

FIG. 1 shows a rotation balancer of an engine according to an embodiment of the present invention, wherein FIG. 1 (A) is a longitudinal side view thereof, and FIG.
FIG. 4 is a vertical cross-sectional front view taken along line -B.

FIG. 2 is a side view showing an assembled state of a rotation balancer to an engine.

FIG. 3 is a longitudinal sectional front view showing a state where a rotary balancer is assembled to an engine.

FIG. 4 is a cross-sectional plan view taken along the line IV-IV in FIG. 3;

FIG. 5 is a longitudinal sectional side view of a rotary balancer of an engine according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Rotary balancer, 12a / 12b ... A pair of balancer bearing boss, 13a / 13b ... Bearing hole, 14 ... Oil inlet chamber, 21 ... Balancer shaft, 21a ... Shaft end part, 22/23 ... Introducing oil path, 25 ... Sliding Bearing, 3
0: balance weight, 40: pressure lubrication device for balancer shaft.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-14943 (JP, A) JP-A 63-170634 (JP, U) JP-A 61-79041 (JP, U) JP-A 63-17041 45239 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] An engine has a pair of balancer bearing bosses (12a).
12b) is fixed at an appropriate distance from each other, and the balancer shaft (2) is inserted into each bearing hole (13a, 13b) of each balancer bearing boss (12a, 12b).
Each shaft end (21a, 21b) of 1) is rotatably fitted and supported via each slide bearing (25, 25), and both balancer bearing bosses (12a
・ 12b) Balance weight between the balancer shaft (21)
(30), and a bearing hole portion of the bearing hole (13a) of one of the pair of balancer bearing bosses (12a) located outside the shaft end (21a) of the balancer shaft (21). To form an oil inlet chamber (14),
Introducing oil passages (22, 23) for guiding the oil pumped into the oil inlet chamber (14) to the slide bearings (25) of the balancer bearing bosses (12a, 12b) are provided inside the balancer shaft (21). In the pressure lubrication device for a rotary balancer shaft of an engine formed and configured, the bearing hole (13a) is provided in the one balancer bearing boss (12a).
Is formed in a bag hole shape that ends on the way without penetrating,
A pressure-feed lubricating device for a rotary balancer shaft of an engine, wherein the oil inlet chamber (14) is formed at a bag-shaped inner hole of the bag-shaped bearing hole (13a).