JPH04138126U - bearing support structure - Google Patents

Abstract

(57) [Summary] [Purpose] The bearing is floatingly supported on the support member via an oil film damper, and the shaft is press-fitted into the support member, and the convex portion of the support member created by the shaft press-fit is attached to the oil film damper. The purpose of the present invention is to provide a bearing support structure that prevents interference with the bearing structure. [Structure] The bearing support structure of this invention is a bearing support structure in which a bearing is floatingly supported on a support member via an oil film damper, and a shaft that supports a rotating member is press-fitted into this support member. It is characterized in that a concave portion is provided to absorb the convex portion generated by the press-fitting of the shaft and prevent interference with the oil film damper.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a bearing support structure.

0002

[Conventional technology]

In the PCT international publication pamphlet WO89/02536, “MECHANICA LLY DRIVEN CHARGER FOR INTERNAL COMB USTION ENGINES” is listed. This is a machine for internal combustion engines It is a type supercharger and is equipped with a planetary gear type speed increasing mechanism. This supercharger The rotor shaft of the air compressor is supported in the housing via bearings. An oil film damper is formed between this bearing and the housing. The floating support provided by this damper increases the durability of the bearing. Improving sexuality.

0003

[Problem that the idea aims to solve]

In the housing, the pinion shaft of the speed increasing mechanism is located on the outer periphery of the oil film damper. The shaft is press-fitted. As shown in Fig. 6, press fit the pinion shaft 201. Then, a convex portion 205 is formed on the housing 203, and the oil film damper 207 may not be properly spaced, resulting in uneven membrane pressure or oil film breaking. Sometimes. When the rotor shaft 209 is rotated at high speed in this state, the bearing 211 may be damaged.

0004 Also, when assembling the bearing 211 after press-fitting the shaft 201, the convex part 205, and assembly may not be possible. In such a case, remove the protrusion 205. However, this part of the housing 203 requires high roundness. It is difficult to process.

[0005] Therefore, this idea is to attach the bearing to the support member via an oil film damper. The shaft is configured to be floatingly supported and press-fitted into the support member, and the shaft is Bearing support that does not damage the oil film damper due to the protrusion caused by press fitting. The purpose is to provide a holding structure.

[0006]

[Means to solve the problem]

The bearing support structure of this invention uses a bearing via an oil film damper. is floatingly supported on the supporting member, and the shaft that supports the rotating member is attached to this supporting member. A bearing support structure that is press-fitted into a member, the shaft being press-fitted into the support member. A concave part is provided to absorb the convex part caused by the oil film damper and prevent interference with the oil film damper. It is characterized by.

[0007]

[Effect]

The concave part provided in the support member offsets the convex part created by the shaft press-fitting, and the oil film Since interference with the pump is prevented, the film pressure is maintained evenly throughout the entire circumference, and the bearing The ring can be supported floating normally. Therefore, the durability of the bearing is improved. do. In this way, there is no protrusion protruding toward the oil film damper, so There is no need to cut the bearing, and the bearing can be assembled even after the shaft is press-fitted.

[0008]

【Example】

One embodiment will be explained with reference to FIGS. 1 to 5. This example is for mechanical supercharger 1. This is an example using Note that the left and right directions are the left and right directions in Figure 1, and are marked with symbols. Other members and the like are not shown.

[0009] The supercharger 1 has a first stage speed increasing part 3 and a second stage speed increasing part which is a planetary gear type speed increasing part. It includes a mechanism 5 and a centrifugal compressor 7.

0010 The casing of the supercharger 1 includes, from the left, a casing body 11 and a support member 13. complex A sensor housing 15 is provided.

[0011] An input shaft 2 is connected to the casing 9 and the main body 11 via bearings 17 and 19, respectively. 1 is supported. The left end of this input shaft 21 is equipped with a speed change plate of a belt type continuously variable transmission. is installed. This belt-type continuously variable transmission uses driving force from the engine. The input shaft 21 is rotated within a predetermined speed range. Input shaft 21 and casing A seal 23 is disposed between the 9 and 9.

0012 A large gear 27 is fixed to the input shaft 21. This large gear 27 and small gear 29 The small gears 29 are fixed on a parallel shaft 31. This shaft 31 is a bare It is supported by the casing 9 and the main body 11 by rings 33 and 35. thus , a first-stage speed increasing section 3 is configured.

[0013] The planetary gear speed increasing mechanism 5 is located between the casing body 11 and the support member 13. It is stored. This speed increasing mechanism 5 includes an internal gear 43 and a pin meshing with the internal gear 43. It includes a nonion gear 45 (rotating member) and a sun gear 47 that meshes with the nonion gear 45 (rotating member).

[0014] The internal gear 43 is formed integrally with the shaft 31 of the speed increasing section 3. pinion The gear 45 is supported by a pinion shaft 51 (shaft) via a bearing 49. Ru. The sun gear 47 is formed on the rotor shaft 53 of the air compressor 7. Ru.

[0015] The pinion shaft 51 is pressed into a hole 55 (FIGS. 3 and 5) provided in the support member 13. At the same time, as shown in FIG. It is prevented from coming off by a falling-off prevention means 57 consisting of a pressed ball. Ru.

[0016] The rotor shaft 53 is supported by a bearing 59. this bearing 59 consists of a combination of two angular contact ball bearings, each outer ring 61, 6 1 and the inner periphery of the bearing housing 63 of the support member 13, as shown in FIG. An oil film is formed in the minute clearance (e.g. 0.1mm) between them. An oil film damper 65 is constructed. With this damper 65, the bearing The gear 59 side is floatingly supported to absorb, for example, self-excited vibrations during high-speed rotation. This increases the durability of the bearing 59.

[0017] As shown in FIG. 3, the pinion shaft 51 on the inner circumference of the bearing housing 63 An axial groove 67 (recess) is formed at the corresponding location. It is shown enlarged in Figure 4. As shown in FIG. Absorb 69 (drawn with a dashed line). Therefore, unlike the conventional example, this convex portion 69 Uneven film pressure or partial oil may be caused by protruding toward the oil film damper 65 side. Since no breakage occurs, the function of the damper 65 is maintained normally.

[0018] In this way, if the depth a of the groove 67 is made equal to or deeper than the height b of the convex portion 69, The oil film damper 65 is not damaged by press-fitting the shaft 51. For example, it becomes easier to use a soft material such as aluminum for the support member 13.

[0019] Also, unlike the conventional example, the protrusion 69 does not interfere with the bearing 59, so the shaft 51 It is possible to assemble the bearing 59 after press-fitting, and there is no need to scrape off the protrusion 69. Since there is no such thing, the cost is reduced accordingly.

[0020] As shown in FIGS. 3 and 5, the support member 13 is provided with a radial groove 71. Ru. As shown in FIG. is fixed. The bearing 59 engages the holding plates 73, 73 in the groove of the outer ring 61. By fitting them together, they are prevented from coming off. Also, there is a support on the right side of the bearing 59. A seal 77 is arranged between the holding member 13 side and the rotor shaft 53 side.

[0021] The oil sprayed from the oil plug 41 is applied to the meshing parts of the speed increasing mechanism 5 and the speed increasing section 3. It lubricates the rotating parts, bearings 59, etc., and also lubricates the oil film damper 65. replenish the oil.

[0022] The impeller 79 of the air compressor 7 is fixed to the rotor shaft 53, and It is prevented from coming off by a nut 81 screwed onto the hole 53. compressor how As shown in FIG. 5 is inserted into the fixing member 83 with a bolt 87. In Figure 2 As shown, this fixation is performed at six locations. The end of the fixing member 83 is a casing. the support member 13 and the compressor housing 15 is fixed to the casing body 11.

[0023] In this way, the air compressor 7 is configured, and the supercharger 1 is configured.

[0024] The driving force of the engine, which is input via the belt type continuously variable transmission, is transmitted to the speed increasing section 3 and the planetary gear. The impeller 79 whose speed has been increased by the re-gear type speed increasing mechanism 5 is rotated at a high speed. airf The intake air sucked from the intake port 91 through the filter is compressed by an air compressor. After being cooled from the discharge port 93 (Fig. 2) via the intercooler, the engine supercharge the engine.

[0025] The bearing 59, which has the heaviest load, is floated by the oil film damper 65. The vibrations are absorbed by the damper 65, and as mentioned above, the function of the damper 65 is maintained properly. Because of this, the durability of the supercharger 1 as well as the bearing 59 is improved.

[0026] The bearing support structure of this invention can be used in applications other than turbochargers and planetary gear mechanisms. It can also be applied to equipment.

[0027]

[Effect of the idea]

The bearing support structure of this invention connects the bearing through an oil film damper. A bearing that is floatingly supported on a support member and whose shaft is press-fitted into the support member. The support structure has a concave part in the support member to absorb the convex part caused by shaft press-fitting. The oil film damper is configured to prevent interference with the oil film damper. There is no unevenness in the damper membrane pressure or damage to the film. Therefore, the durability of the bearing Improves sex. In addition, there is no need to scrape off the convex parts, reducing costs. , it is possible to assemble the bearing after press-fitting the shaft.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a mechanical supercharger using one embodiment, and corresponds to the BB sectional view in FIG. 2.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is a plan view of the support member.

FIG. 4 is an enlarged view of part c in FIG. 3;

FIG. 5 is a longitudinal cross-sectional view of the support member.

FIG. 6 is a sectional view showing a conventional example.

[Explanation of symbols]

13 Support member 45 Pinion gear (rotating member) 51 Pinion shaft (shaft) 59 Bearing 65 Oil film damper 67 Groove (recess) 69 Convex part

Claims (1)

[Scope of utility model registration request] 1. A bearing support structure in which a bearing is floatingly supported on a support member via an oil film damper, and a shaft for supporting a rotating member is press-fitted into the support member, wherein the shaft is press-fitted into the support member. A bearing support structure characterized by having a concave portion that absorbs the generated convex portion and prevents interference with the oil film damper.