JP3093335U - Gear case for vehicle differential - Google Patents

Abstract

(57) [Summary] (Modifications) [PROBLEMS] To provide a gear case of a vehicle differential that can increase the rigidity of a gear case of the vehicle differential and maintain oil flow. SOLUTION: In a two-pinion type vehicle differential device for transmitting rotational driving force from a vehicle engine to driving wheels,
A gear case main body 2 having a flange portion 4 on one end side outer peripheral portion and an opening 7 for incorporating gears 5 and 6 at an end portion on the flange portion 4 side, and a flange connected to the flange portion 4 And a case divided body 3 having a portion 30 and closing an opening of the gear case main body.
A peripheral wall portion extending from the flange portion to the other end, and a drive shaft support portion extending from an end of the peripheral wall portion;
Are four oil flow openings 1 located at four equally circumferential positions.
2, a pivot wall 13 that pivotally supports the pair of pinions, and a pair of strength walls located between the pair of pivot walls 13.

Description

[Detailed description of the device]

[0001]

TECHNICAL FIELD The present invention relates to a gear case of a vehicle differential device. , In particular, a vehicle differential device that enhances the rigidity of the gear case and also maintains the oil flow Regarding the gear case of.

[0002]

2. Description of the Related Art A vehicular differential device drives a rotational driving force from a vehicle engine. It is a device that transmits to the driving wheels, and allows the differential between the inside and outside driving wheels when driving on a curve. Have the function of The gear case of the vehicle differential is composed of multiple pinions and sides. It is for incorporating gears, and the rotational driving force from the engine is transmitted to the outer peripheral part. The ring gear is attached or integrated.

[0003]   For example, in utility model registration No. 3071694, as shown in FIG. In the on-type vehicle differential device, the gear case 50 and the gear case main body 51 form a casing. It is configured so that it can be divided into a space division body 52. The gear case body 51 is a franc The peripheral portion 54 extending from the flange portion 53 to the other end side, and the peripheral wall portion 54. Has a drive shaft support portion 55 and the like connected to the end portion thereof. The peripheral wall 54 has a pair of pinions. A pair of seat surfaces 57 for receiving the 56 and a seat surface 59 for receiving the side gear 58 are formed. ing.   The case divided body 52 has a flange connected to the flange portion 53 of the gear case body 51. A lunge portion 60, a ring gear 61 integrally formed on the outer peripheral portion of the flange portion 60, A seating surface 62 of the side gear 58 and the like are formed. This gear case 50 is assembled At the time of opening, the pinion 56 is inserted through the opening 63 formed in the split surface of the gear case body 51. The workability is improved by incorporating the and side gears 58. Gear case body 5 The peripheral wall 54 of No. 1 is formed over the entire circumference and maintains the rigidity of the gear case 50. .

[0004]   In the publication, as shown in FIG. 6, a gear case 7 integrally molded so as to be indivisible. 0 is also disclosed. The gear case 70 includes a peripheral wall portion 71 and a drive shaft support portion 75. a, 75b, etc. The peripheral wall 71 includes a gear case 70, a pinion and a side. An opening window 72 for incorporating gears (not shown) and a seat for receiving the pinion A surface 73 and a seat surface 74 for receiving the side gear are formed. Opening window 72 The oil for lubrication is distributed inside and outside the gear case 70.

[0005]

[Problems to be Solved by the Invention] However, in the gear case 50 shown in FIG. In order to maintain the rigidity of the gear case 50, the peripheral wall portion 54 is formed over the entire circumference. However, the flow of oil for lubrication is mostly inside and outside the gear case 50. Since the oil inside the gear case 50 deteriorates quickly, It may cause burning. The ring gear 61 is aligned with the flange portion 60. Since it is integrated, the manufacturing process of the ring gear 61 is complicated, and the gear case is Since the ring 50 is manufactured by casting, only the ring gear 61 is made of an expensive material. Since it is not possible to use expensive materials for the entire gear case 50, production costs It is difficult to reduce. On the other hand, in the gear case 70 shown in FIG. 6, the peripheral wall portion 7 1 has the opening window 72 formed therein, the rigidity of the gear case 70, especially the rigidity of the peripheral wall portion. It becomes difficult to increase the rigidity of the property 71, and the opening window 72 is reduced to increase the rigidity. Then, when manufacturing the gear case 70, a bearing surface for receiving gears is internally machined. It is difficult to install, and it is difficult to assemble gears during assembly. Occurs.   The object of the present invention is to enhance the rigidity of the gear case of the vehicle differential and to distribute the oil. It is intended to provide a gear case of a vehicle differential device capable of maintaining the above.

[0006]

A gearbox for a vehicle differential according to claim 1. Is a two-pinion type vehicle that transmits the rotational drive force from the vehicle engine to the drive wheels. In a dual-purpose differential device, the gear case has a flange portion on the outer peripheral portion on one end side and has a flange. The gear case main body having an opening for incorporating gears at the end on the side of the lunge, and the flap A case having a flange portion connected to the lunge portion and closing the opening of the gear case body. The gear case body is connected to the other end side from the flange portion. A peripheral wall portion and a drive shaft support portion continuous with an end portion of the peripheral wall portion, wherein the peripheral wall portion is a circle. Four oil circulation openings located in four equal positions around the circumference and a pivot that pivotally supports a pair of pinions. A support wall portion and a pair of strength wall portions positioned between the pair of pivot support wall portions, By forming the inner surface of the degree wall portion on the smaller diameter side than the inner surface of the pivot wall portion, It is characterized by increasing the rigidity of.

[0007]   The gear case of this vehicle differential is the oil in the differential case of the vehicle differential. When it is housed together with the vehicle and the rotational driving force from the vehicle engine is transmitted, the differential case Rotate in. In this gear case, it was formed on the peripheral wall when rotating. Oil flows through the inside and outside of the gear case through the four oil circulation openings. It Therefore, the deterioration of the oil in the gear case is prevented, the lubricity of the oil is maintained, and The durability can be improved.   The peripheral wall of this gear case ensures the rigidity of the gear case by the strength wall and the pivot wall. The inner surface of the strength wall is formed on the smaller diameter side than the inner surface of the pivot wall. By making the strength wall part thicker than the pivot wall part, the rigidity of the gear case is enhanced.

[0008]   When manufacturing the gear case main body, a seat for receiving gears by cutting the inner surface A surface is formed, but at that time, a cutting tool such as a bite is opened from the opening of the gear case body. Can be easily inserted, and the moving range of the inserted cutting tool can be increased. By doing so, the seating surface etc. can be easily cut. When assembling gear case Since it is possible to install gears from the opening of the gear case body, Assembling the case is easy and the assembly time is shortened.

[0009]   According to a second aspect of the present invention, there is provided the gear case of the vehicle differential device according to the first aspect of the present invention. The oil passage opening is elongated in the axial direction of the drive shaft support portion. It is a characteristic. In the gear case of this vehicle differential, the oil distribution By forming the opening in the direction of the axis, the width of the pivot wall and the strength wall in the circumferential direction can be reduced. The rigidity of the gear case can be further increased.

[0010]   The gear case of the vehicle differential device according to claim 3 is the same as that according to claim 1 or 2. In the plan, a flange portion of the gear case body and a flange portion of the case division body In addition, the ring gear is fixed by tightening together with multiple bolts. Of. For the gear case of this vehicle differential, assemble the gear case Sometimes, the ring gear is attached to the flange part of the gear case body and the flange part of the case division body. Fasten together with multiple bolts. That is, the ring gear is Since it is fixed at the same time when connecting the case dividing part, the assembly time can be shortened. . Also, by making the ring gear separate from the gear case, the ring gear can be easily manufactured. Material cost of the gear case can be reduced by configuring only the ring gear with an expensive material. It can be reduced.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. It   The present embodiment is applied to a gear case of a two-pinion type vehicle differential device for a front-wheel drive vehicle. The present invention is applied. A vehicle differential is a rotary drive from a vehicle engine. The power is transmitted to the drive wheels via the drive shafts 24a and 24b. Some illustration Although omitted, the vehicle differential is a differential case with oil stored inside and a differential case. It has a gear case 1 housed in the case, a pinion 5, a side gear 6, and the like. It is equipped with a differential gear mechanism. It should be noted that the upper, lower, left and right in FIG.   As shown in FIGS. 1 to 4, a gear case 1 (hereinafter referred to as a gear case) of this vehicle differential device. Is referred to as a gear case main body 2 and a case portion connected to the gear case main body 2. The split body 3 is provided.   The gear case body 2 has a flange portion 4 on the outer peripheral portion on one end side and an end portion on the flange portion 4 side. An opening 7 for incorporating a pinion 5 and a side gear 6 that meshes with the pinion 5, and the like. A peripheral wall portion 8 connected from the flange portion 4 to the other end side, and a drive connected to an end portion of the peripheral wall portion 8. And a shaft support portion 9.

[0012]   Twelve bolt holes 11 consisting of screw holes are formed in the flange portion 4 at equal intervals in the circumferential direction. Is made.   The peripheral wall portion 8 is located at four equally divided positions on the circumference, and is thin in the axial direction of the drive shafts 24a and 24b. Four long oil passage openings 12 and a pivot that pivotally supports a pair of pinions 5. A wall portion 13 and a pair of strength wall portions 14 located between the pair of pivotally supporting wall portions 13; It has a connecting wall portion 15 that is continuous with the moving shaft support portion 9. In the upper and lower pivot wall parts 13, Partially spherical seat surface 16 for receiving the pinion 5 and a pair of pinions 5 are pivotally supported. A pinion shaft support hole 18 for supporting the pinion shaft 17 is formed, and an upper pivot wall is formed. A spring pin 19 for preventing the pinion shaft 17 from coming off is inserted into the portion 13. A pin fitting hole 20 is formed.

[0013]   The bearing surface 16 for receiving the pinion 5 has oil flowing through the back surface of the pinion 5. An oil groove 21 for forming the oil is formed. Although not shown, the pinion 5 and the seat surface 16 A thrust washer is installed between the two. To increase the rigidity of the gear case 1 The outer surfaces of the strength wall portion 14 and the pivot wall portion 13 are formed to have the same diameter. Is formed on the smaller diameter side by about 5 to 10 mm than the inner surface of the pivotal wall portion 13. The portion 14 is configured to be thicker than the pivot wall portion 13. On the inner surface of the connecting wall portion 15, A seating surface 22 for receiving the side gear 6 is formed, and the seating surface 22 has a seating surface 22. An oil groove 23 for circulating oil is formed on the back surface of the dog gear 6. Figure Although not shown, a thrust washer is mounted between the side gear 6 and the bearing surface 22. .   The drive shaft support portion 9 is a shaft into which a drive shaft 24a connected to the right drive wheel is fitted. A hole 25 is formed in the outer peripheral surface of the shaft hole 25. An oil groove 26 for circulating the oil is formed.

[0014]   The case division body 3 is a flange portion connected to the flange portion 4 of the gear case body 2. 30, a drive shaft support portion 31 connected to the flange portion 30, a flange portion 30, and a drive shaft It has the connection part 32 which connects the support part 31. The flange 30 has a gear cage. 12 bolt holes 34 through which the bolts 33 for connecting to the main body 2 pass Are formed at positions corresponding to the screw holes 11 of the gear case body 2. Drive shaft support The holding portion 9 has a shaft hole 35 into which the drive shaft 24b connected to the left drive wheel is fitted. Is formed concentric with the shaft hole 25 on the side, and the outer peripheral surface of the shaft hole 35 drives the gear case body 2. An oil groove 36 is formed similarly to the inner peripheral surface of the moving shaft support portion 9. On the connecting wall 15 Is formed with a bearing surface 38 having an oil groove 37 for receiving the side gear 6.   The gear case main body 2 and the case division body 3 are arranged so that the flange portion 30 of the case division body 3 has a The bolt 33 that penetrates through the bolt hole 34 is screwed into the flange portion 4 of the gear case body 2. 11 is screwed and connected to close the opening 7 of the gear case body 2, but at the same time , Ring gear 39 is also tightened together by inserting 12 bolts 33 into bolt holes 34. It is fixed.

[0015]   Next, the operation and effect of the gear case 1 described above will be described.   The gear case 1 has four oil circulation openings 12 on the peripheral wall portion 8 of the gear case body 2. Since it is formed, the gear case 1 is rotated by the rotational driving force from the engine. Oil flows inside and outside the gear case 1, and oil inside the gear case 1 It is possible to prevent deterioration of the gears, maintain the lubrication performance, and improve the durability of the gears 5 and 6. it can. These oil circulation openings 12 extend in the direction of the axes of the drive shafts 24a and 24b. Since it is elongated, the strength wall portion 14 and the pivot support wall portion 13 have a uniform width in the circumferential direction. Therefore, the rigidity of the gear case 1 is improved.

[0016]   The rigidity of the gear case 1 is ensured by forming the pair of strength wall portions 14 on the peripheral wall portion 8. Furthermore, the inner surface of the strength wall portion 14 is located on the smaller diameter side by about 5 to 10 mm from the inner surface of the pivot wall portion 13. By forming the gear case 1, the rigidity of the gear case 1 is enhanced.   The ring gear 39 serves to connect the flange portion 4 of the gear case body 2 and the flange of the case division body 3. Since it is fixed to the lunge part 30 by 12 bolts 33, it is fixed. Since the case body 2 and the case division body 3 can be fixed at the same time when they are connected, Standing time can be shortened. In addition, the ring gear 39 is separated from the gear case 1. By making it into a body, the ring gear 39 can be easily manufactured, and only the ring gear 39 can be raised. By using a valuable material, the material cost of the gear case 1 can be reduced.

[0017]   Since the gear case body 2 has the opening 7, the pin case is formed on the inner surface of the gear case body 2. When cutting the bearing surface 16 of the ON 5 and the bearing surface 22 of the side gear 6, Since any cutting tool can be easily inserted and the range of movement of the inserted cutting tool is large, Can easily cut surfaces. Further, by having the opening 7, the pinion 5 and It becomes easy to assemble the side gear 6, and the assembly time is shortened.

[0018]   Next, a description will be given of a modified mode in which the above embodiment is partially modified.   (1) Attach the ring gear to the flange portion 4 of the gear case body 2 or the case divided body 3 The flange portion 30 may be integrally formed. With this configuration, when assembling The time can be further shortened.   (2) The oil circulation opening 12 may be formed in another shape. This oil circulation opening 12 is only required to allow the oil to flow inside and outside the gear case 1. However, the shape is not particularly limited.   (3) The gear case 1 is applied to rear-wheel drive vehicles and four-wheel drive vehicles as well as front-wheel drive vehicles. You may.   The present invention is not limited to the above-described embodiments, and those skilled in the art can For example, various modifications may be made to the embodiment without departing from the spirit of the invention. It can be applied and the present invention also covers these modifications.

[0019]

According to the gear case of the vehicle differential device of claim 1, It is housed together with oil in the differential case of the differential gear, and is driven by the engine of the vehicle. When power is transmitted, it rotates in the differential case. In this gear case, When rolling, the four oil circulation openings formed in the peripheral wall portion allow the inside and outside of the gear case to Oil circulates throughout. Therefore, prevent the deterioration of the oil in the gear case, and The lubricity of the wheel can be maintained and the durability of the gears can be improved.   The peripheral wall of this gear case ensures the rigidity of the gear case by the strength wall and the pivot wall. The inner surface of the strength wall is formed on the smaller diameter side than the inner surface of the pivot wall. By making the strength wall part thicker than the pivot wall part, the rigidity of the gear case is enhanced.

[0020]   When manufacturing the gear case main body, a seat for receiving gears by cutting the inner surface A surface is formed, but at that time, a cutting tool such as a bite is opened from the opening of the gear case body. Can be easily inserted, and the moving range of the inserted cutting tool can be increased. By doing so, the seating surface etc. can be easily cut. When assembling gear case Since it is possible to install gears from the opening of the gear case body, Assembling the case is easy and the assembly time is shortened.

[0021]   According to the gear case of the differential device for a vehicle of claim 2, the oil flow opening is closer to the shaft center. The width of the pivot wall and the strength wall in the circumferential direction should be increased by making them elongated in the same direction. Therefore, the rigidity of the gear case can be further enhanced. Others are the same as in claim 1. The effect of can be produced.

[0022]   According to the gear case of the vehicle differential device of claim 3, when the gear case is assembled, , The ring gear to the flange of the gear case body and the flange of the case division Tighten together with multiple bolts. That is, the ring gear is connected to the gear case body and the case. Since it is fixed at the same time when connecting the space dividing part, the assembling time can be shortened. Well In addition, by making the ring gear separate from the gear case, the ring gear can be easily manufactured. The material cost of the gear case is reduced by configuring only the ring gear with an expensive material. can do.

[Brief description of drawings]

FIG. 1 is a sectional view of a gear case according to an embodiment.

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view of a conventional gear case.

FIG. 6 is a cross-sectional view of another conventional gear case.

[Explanation of symbols]

1 gear case 2 Gear case body 3 case division 4 Flange part 5 pinion 6 side gear 7 openings 8 peripheral walls 9 Drive shaft support 12 Oil circulation opening 13 pivot wall 14 Strength wall 30 Flange 33 volts 39 ring gear

Claims (3)

[Scope of utility model registration request] 1. A two-pinion type vehicle differential device for transmitting a rotational driving force from an engine of a vehicle to a drive wheel via a drive shaft, wherein a gear case has a flange portion on an outer peripheral portion on one end side, and a flange. A gear case main body having an opening for gear assembly at the end on the side of the section, and a case division body having a flange portion connected to the flange portion and closing the opening of the gear case main body, wherein the gear case main body is A peripheral wall portion that extends from the flange portion to the other end side and a drive shaft support portion that extends to an end portion of the peripheral wall portion, and the peripheral wall portion has four oil circulation openings located at equally divided circumferential positions. And a pair of pivot walls for pivotally supporting the pair of pinions, and a pair of strength walls located between the pair of pivot walls. By forming on the smaller diameter side than the inner surface of the part, The gear case of the vehicle differential apparatus characterized by increased rigidity of the parts. 2. The gear case for a vehicle differential device according to claim 1, wherein the oil flow opening is formed to be elongated in a direction of an axis of the drive shaft support portion. 3. The vehicle according to claim 1, wherein the ring gear is fixed to the flange portion of the gear case main body and the flange portion of the case divided body by co-tightening with a plurality of bolts. Differential gear case.