JPH04128556U - Pinion shaft fixing structure for planetary gears - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a pinion shaft fixing structure that is not limited by heat treatment methods, has no risk of deformation or strain during fixation, and is easy to process and assemble. [Structure] A pin insertion hole 21 that penetrates in the radial direction is formed at the end of the pinion shaft 20, and a fixing pin 25 is press-fitted into the pin insertion hole 21 so that the end protrudes from the outer peripheral surface of the pinion shaft 20. . On the other hand, a shaft insertion hole 15 is formed through the left and right walls 11 and 14 in the axial direction that form the pinion gear installation space 10a in the carrier 10, and a shaft insertion hole 15 is formed on the outer surface of one of the left and right walls. Pin holding groove 16 extending in the direction of the outer circumference
is formed. Here, when the pinion shaft 20 is inserted into the shaft insertion hole 15, the end of the fixing pin 25 enters into the pin holding groove 16, and after inserting the pinion shaft 20 in this way, the carrier 1
A presser member 5 is attached to the outer surface of one of the walls of 0, covering the pin holding groove 16.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention allows the pinion gear to rotate freely in the carrier that constitutes the planetary gear. The present invention relates to a structure for fixing a supported pinion shaft to a carrier.

0002

[Conventional technology]

The carrier in a planetary gear can rotate multiple pinion gears at equal intervals on the circumference. However, in order to hold this pinion gear, a pinion gear is attached to the carrier. The shaft is fixed. The conventional method of fixing the pinion shaft is as follows: 1) After inserting the pinion shaft into the carrier, caulk the shaft end to fix it. Method 2) After inserting the pinion shaft into the carrier, weld the shaft end to the carrier. (for example, the method disclosed in Japanese Utility Model Application Publication No. 17562/1983) 3) The carrier is divided into two parts, and the pinion shaft is sandwiched between the carriers. How to assemble the rear 4) A pin insertion hole is formed in the pinion shaft and carrier in the direction perpendicular to the axis. After inserting the pinion shaft into the carrier, insert the pin into the pin insertion hole. A method of fixing a nion shaft (for example, disclosed in Japanese Utility Model Application No. 62-40346) method) etc. are known.

0003

[Problem that the idea aims to solve]

However, each of the above methods has the following problems. 1) The method of caulking the end of the pinion shaft is based on the hardness of the end of the pinion shaft. It is necessary to perform heat treatment that does not raise the temperature too high. However, the pinion shaft The pinion gear is a member that rotatably supports the pinion gear via a bearing, etc. High hardness is required for the parts that support the bearings. For this reason, the pinion shaft The heat treatment for the edges is limited to induction hardening except for the edges and carburizing hardening to prevent carburization of the edges. There is a problem of being exposed. Furthermore, deformation of the pinion shaft and stiffness may occur during caulking. There is also a problem in that there is a risk of sagging. 2) In the case of the method of welding the end of the pinion shaft to the carrier, the shaft end It is difficult to increase the hardness of the edges because there is a problem of weld cracking if the edges are too hard. However, there are problems with heat treatment similar to those mentioned above. In this case, due to the heat of welding, There is also the problem that the pinion shaft may be deformed or strained.

0004 3) When using a split type carrier, there is a boss for joining the carriers. It is necessary to provide a boss part, and this boss part compresses the installation space of the pinion gear. For example, when installing many pinion gears such as a double pinion type The problem is that this configuration cannot be adopted, and the ease of assembly is not very good. There is a problem. 4) In the case of the method of fixing the pinion shaft with a pin, the carrier and It is necessary to form an insertion hole for the pin in the pinion shaft in advance, and the machining process The problem of increasing the number of pinion shafts, the direction of insertion into the pinion shaft carrier, and the insertion of pins The direction is different by 90 degrees, and the pinion Because the phase of the insertion hole of the shaft needs to be aligned, assembly workability is not good. There is a problem.

[0005] In view of the problems of the conventional fixing method as mentioned above, this invention was developed to fix pinion shafts. There are no restrictions on the heat treatment method for A pinion shaft with a structure that eliminates the risk of breakage and is easy to process and assemble. The purpose is to obtain a fixed structure.

[0006]

[Means to solve the problem]

In order to achieve the above objective, in this invention, the end of the pinion shaft is provided with a A penetrating pin insertion hole is formed, and the end of the pinion shaft is inserted into the pin insertion hole. The fixing pin is press-fitted so that it protrudes from the peripheral surface, while the A shaft insertion hole is formed through the left and right walls in the axial direction that form the pinion gear installation space. At the same time, on the outer surface of one of the left and right walls, from the shaft insertion hole to the radial outer circumference. A pin holding groove extending in the direction is formed. Here, when the pinion shaft is inserted into the shaft insertion hole, the end of the fixed pin The part fits into the pin holding groove, and the pinion shaft can be held in this way. After insertion, place a holding member on the outer surface of one wall of the carrier, covering the pin retaining groove. is installed.

[0007]

【Example】

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. A carrier assembly to which the present invention is applied is shown in FIG. The carrier assembly includes a carrier 10 and a carrier assembly fixed to the carrier 10. A pinion shaft 20 and a roller bearing 2 on this pinion shaft 20. The pinion gear 1 is rotatably arranged through the It has a clutch hub 5.

[0008] The carrier 10 has a circular shape having an inner diameter boss portion in which a spline 13 is formed. A disc-shaped first carrier member 11 and a plurality of carrier members whose outer diameter portions are bent at right angles. The second carrier member 14 has an arm portion 14a. The tip end is joined to the side surface of the first carrier member 11 as shown in the figure. As shown in FIG. ), and the space between each arm portion 14a is open radially outward. This diameter The wall surface of the first carrier member 11 and the second carrier portion at the location opened outward in the direction The space surrounded by the wall surface of the material 14 is the pinion gear installation space 10a (Fig. 3 ), the pinion shaft 20 and pinion gear 1 are located in this space 10a as shown in FIG. It is arranged as follows.

[0009] Therefore, as shown in FIGS. 2 and 3, the position between the arm portions 14a on the circumference is axially penetrates the first and second carrier members 11 and 14 at the location where the Shaft insertion holes 15 and 17 are formed. Note that in this example, this carrier The planetary gear that the assembly is used for is a double pinion type planetary gear. Shaft insertion holes 15 and 17 are formed. For this reason, single pinion In the case of a type of planetary gear, only one shaft insertion hole is required. However, two shaft insertion holes 15 and 17 are formed between each arm part 14a. In this example, the arm portions 14a are provided at three locations, so Although not shown in Fig. 2, three pairs of shaft insertion holes 15 and 17 are formed at equal intervals on the circumference. will be accomplished. Further, on the outer surface of the second carrier member 14, inside each of the shaft insertion holes 15, 17, Pin retaining grooves 16, 18 are formed that extend radially outwardly through the core. The second carrier member 14 also has a rivet 7 at the same circumferential position as the arm portion 14a. A rivet hole 19 is formed for attaching.

0010 The pinion shaft 20 is a cylindrical member that passes through one end thereof in a direction perpendicular to the axis. A pin insertion hole 21 is formed. A fixing pin 25 is placed inside this pin insertion hole 21. Both ends of the pinion shaft 20 protrude from the outer circumferential surface of the pinion shaft 20 and are press-fitted therein. Note that the pinion shaft 20 has a lubrication hole 2 for lubricating the bearing 2, etc. 2 and a notch 23 for guiding lubricating oil into the lubricating hole 22. Also, The outer wall surface of the first carrier member 11 has an oil groove for guiding lubricating oil to this notch 23. 11a is formed.

[0011] Assembly of this carrier assembly will be explained with reference to FIG. 3. First, install the roller bearing 2 on the inner diameter of the pinion gear 1, and then Attach thrust washers 3, 3 to the sides. Then, in this state, roller - The inner diameters of the bearing 2 and thrust washers 3, 3 match the shaft insertion hole 15. As shown by arrow A, the entire pinion gear installation space 10a is Placed within.

0012 Next, the pinion shaft 20 with the fixing pin 25 press-fitted into the pin insertion hole 21 is inserted. , from the side of the second carrier member 14, with the fixing pin 25 side facing the rear side, as shown by arrow B. Insert the shaft into the shaft insertion hole 15 as shown. At this time, the pinion shaft 20 is the roller bearing 2 and the roller bearing 2 arranged in the pinion gear arrangement space 10a. and inserted into the shaft insertion hole 15 through the inner diameter of the thrust washers 3, 3. As shown in FIG. 1, the pinion gear 1 is rotatable by a pinion shaft 20. It will be in a state where it is supported. At this time, both ends of the fixed pin 25 are in the pin holding groove 1. 6, and the rear end of the pinion shaft 20 is inserted into the carrier 10 (second carrier part It protrudes laterally from the side surface of the material 14). Also, although not shown, there is another pinion gear that constitutes a double pinion. The roller bearing and thrust washer are also inserted into the shaft insertion hole 17. The shaft is arranged in the pinion gear arrangement space 10a so as to match, and the shaft is inserted. It is rotatably supported by a pinion shaft inserted into the hole 17.

[0013] After that, the clutch hub 5 is brought into contact with the outer surface of the second carrier member 14. is attached to the carrier 10, and the assembly of the carrier assembly is completed. This club A rivet hole 5c is formed in the latch hub 5, and this rivet hole 5c is connected to the second key. Rivet connection is made to the rivet hole 19 formed in the carrier member 14. Accordingly, the clutch hub 5 is joined to the side surface of the carrier 10. Note that the clutch hub 5 has a shaft insertion hole when it is joined to the carrier 10. A through hole 5b matching the holes 15 and 17 is formed. For this reason, the clutch hub 5 is connected to the carrier 10, the side of the carrier 10 of the pinion shaft 20 The rear end protruding from the surface enters the through hole 5b, and both ends of the fixing pin 25 enter the through hole 5b. The pin holding groove 16 that has been inserted is covered by the clutch hub 5.

[0014] In this way, the fixed pin 25 is covered by the clutch hub 5 and the pin retaining groove 16 Since the pinion shaft 20 into which the fixing pin 25 is press-fitted is held in the Rolling is prevented, axial movement is also prevented, and it is fixed to the carrier 10. As can be seen from this, in this example, there is a clutch plate support strip on the outer circumferential side. A clutch hub 5 having plines 5a serves as a holding member. However, the holding member is not limited to this clutch hub, but may also be a simple plate-shaped member. Various types such as the above can be used.

[0015] FIG. 4 shows a carrier assembly using a disc-shaped holding plate 80 as a holding member. It is shown in This carrier assembly also applies the structure according to the present invention. The assembly includes a carrier 50 and a pinion shaft 6 fixed to this carrier 50. 0, and is rotatable via a roller bearing 72 on this pinion shaft 60. A pinion gear 71 arranged on the carrier 50 and a holding plate fixed on the side of the carrier 50. and 80.

[0016] The carrier 50 has a disk-shaped first carrier member 51 and an outer diameter portion bent at right angles. a second carrier member 54 having a plurality of arm portions 54a formed by It consists of a cylindrical hub member 53 joined to the inner diameter part of the carrier member 54, and The tip of the arm portion 54a is joined to the side surface of the first carrier member 51 as shown in the figure. It is. The outer peripheral end of the first carrier member 51 is bent outward at a substantially right angle, and , as shown in FIG. 5, a plurality of engagement grooves 52b are formed in this bent portion and An engaging protrusion 52a is provided. On the left side of this carrier assembly in Figure 4. Another carrier assembly is placed in the carrier of this other carrier assembly. is provided with an engagement protrusion that fits into the engagement groove 52b, and when the two engage, the two The carriers are connected together.

[0017] As shown in FIG. 6, the arm portions 54a of the second carrier member 54 are arranged at equal intervals on the circumference. A plurality of arm portions 54a (four in this example) are formed in the radially outward direction between each arm portion 54a. It is open to The first carrier member 51 at this radially outwardly opened location A space surrounded by the wall surface of the second carrier member 54 is for arranging the pinion gear. A space 50a (see FIG. 8), in which a pinion shaft 60 and a and pinion gear 71 are arranged as shown in FIG.

[0018] Therefore, as shown in FIGS. 5, 6, and 8, between the arm portions 54a on the circumference, axially penetrates the first and second carrier members 51 and 54 at a location located at Shaft insertion holes 55 and 57 are formed therethrough. Note that in this example as well, this The planetary gear used by the rear assembly is a double pinion type planetary gear. , two shaft insertion holes 55 and 57 are formed. However, two shaft insertion holes 55 and 57 are formed between the arm portions 54a. In this example, the arm portions 54a are provided at four locations, so Four sets of shaft insertion holes 55 and 57 are formed at equal intervals on the circumference. Further, on the outer surface of the second carrier member 54, the inside of each shaft insertion hole 55, 57 is provided. Pin retaining grooves 56, 58 are formed that extend radially outwardly through the core. Further, the second carrier member 54 has a rivet 7 at the same circumferential position as the arm portion 54a. A rivet hole 59 for attaching 7 is formed.

[0019] The hub member 53 has a spline 53a on its outer diameter surface. The gear member is attached by fitting into the ring. Therefore, this gear member is Rotates the same as 0. The holding plate 80 is a thin disc-shaped member as shown in FIG. is bent outward at approximately right angles at four locations at equal intervals on the circumference to form a bent portion 8. 1 is formed. Furthermore, the second carrier member 54 is attached in contact with the side surface of the second carrier member 54. A rivet hole is formed at a position that overlaps with the rivet hole 59 of the second carrier member 54 when the 82 is formed.

[0020] The pinion shaft 60 is a cylindrical member that passes through one end thereof in a direction perpendicular to the axis. A pin insertion hole 61 is formed. A fixing pin 75 is placed inside this pin insertion hole 61. Both ends of the pinion shaft 60 protrude from the outer peripheral surface of the pinion shaft 60 and are press-fitted therein. Note that the pinion shaft 60 has a lubrication hole for lubricating the bearing 72, etc. 62 is formed.

[0021] Assembly of this carrier assembly will be explained with reference to FIG. 8. First, the roller bearing 72 is attached to the inner diameter of the pinion gear 71, and then , thrust washers 73, 73 are attached to both sides. And stay in this state , the inner diameter of the roller bearing 72 and thrust washers 73, 73 is the same as that of the shaft. Align the entire pinion gear with the insertion hole 55 as shown by arrow A. It is arranged within the installation space 50a.

[0022] Next, the pinion shaft 60 with the fixing pin 75 press-fitted into the pin insertion hole 61 is inserted. , from the side of the second carrier member 54, with the fixing pin 75 side facing toward the rear, as shown by arrow B. Insert the shaft into the shaft insertion hole 55 as shown. At this time, the pinion shaft 60 is the roller bearing 72 arranged in the pinion gear arrangement space 50a. and the inner diameter of the thrust washers 73, 73 to be inserted into the shaft insertion hole 55. As shown in FIG. 4, the pinion gear 71 is It is in a state where it is rotatably supported. Note that at this time, both ends of the fixed pin 75 are The rear end surface 60a of the pinion shaft 60 is inserted into the holding groove 56, and the rear end surface 60a of the pinion shaft 60 is attached to the carrier 50. It is almost the same as the side surface 54b of (the second carrier member 54). Also, although not shown, there is another pinion gear that constitutes a double pinion. The roller bearing and thrust washer are also inserted into the shaft insertion hole 57. The shaft is arranged in the pinion gear arrangement space 50a so as to match with each other, and the shaft is inserted. It is rotatably supported by a pinion shaft inserted into the hole 57.

[0023] After this, the holding plate 8 is brought into contact with the outer surface of the second carrier member 54. 0 to the carrier 50. At this time, the rivet hole 82 of the holding plate 80 The rivet hole 59 of the second carrier member 54 overlaps with the rivet hole 59 of the second carrier member 54. By inserting a rivet into . 80 is joined and attached to the side of the carrier 50, and the carrier assembly is assembled. Complete. Note that, as described above, the rear end surface 60a of the pinion shaft 60 is connected to the carrier 50 ( Since it is substantially the same as the side surface 54a of the second carrier member 54), the retaining plate 82 is attached to cover the rear end surface 60a of the pinion shaft 60.

[0024] In this way, the pin holding groove 56 is inserted into the holding plate 80 while the fixing pin 75 is inserted. Since the fixing pin 75 is covered and held fixed, the fixing pin 75 is press-fitted. The rotated pinion shaft 60 is prevented from rotating and from moving in the axial direction. , is fixed to the carrier 50. As can be seen from this, in this example, the holding plate 80 is used as a holding member. playing a role.

[0025]

[Effect of the idea]

As explained above, according to the present invention, the end portion of the pinion shaft is penetrated in the radial direction. A pin insertion hole is formed through which the pin is inserted, and the end of the pinion shaft is inserted into the pin insertion hole. Press fit the fixing pin so that it protrudes from the surface, while the pinion in the carrier Shaft insertion holes are formed through the left and right walls in the axial direction that form the gear installation space. , extending radially outward from the shaft insertion hole on the outer surface of one of the left and right walls. A pin holding groove is formed that allows the pinion shaft to be inserted into the shaft insertion hole. Sometimes, the end of the fixing pin enters the pin retaining groove and the top of the carrier. Attach a presser member to the outside surface of one wall to cover the pin retaining groove and press it inside the pin retaining groove. The pinion shaft is fixed by holding the fixed pin in place. Therefore, caulking and welding are not required, and the pinion shaft deforms when fixed. Or, there is no risk of distortion, and the pinion shaft heat treatment method is also automatic. You can choose freely. Also, after press-fitting the fixing pin into the pinion shaft, When inserting the fixing pin into the foot insertion hole, it is best to insert the end of the fixing pin into the pin holding groove. Therefore, the machinability of the carrier assembly components and the carrier assembly The ease of assembly can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a carrier assembly having a pinion shaft fixing structure according to the present invention.

FIG. 2 is a side view showing a carrier constituting this carrier assembly.

FIG. 3 is a cross-sectional view showing the carrier assembly exploded into component parts.

FIG. 4 is a sectional view showing a different example of a carrier assembly having a pinion shaft fixing structure according to the present invention.

FIG. 5 is a left side view showing a carrier constituting this carrier assembly.

FIG. 6 is a right side view showing a carrier constituting this carrier assembly.

FIG. 7 is a right side view showing a holding plate that constitutes this carrier assembly.

FIG. 8 is a cross-sectional view showing the carrier assembly exploded into component parts.

[Explanation of symbols]

1,71 Pinion gear 5 Clutch hub 10,50 carrier 15, 17, 55, 57 Shaft insertion hole 16, 18, 56, 58 Pin holding groove 20,60 pinion shaft 25,75 Fixed pin

Claims (1)

[Scope of utility model registration request] Claims: 1. A carrier having a shaft insertion hole formed through axial left and right walls forming a space for arranging a pinion gear; a pinion shaft inserted into the shaft insertion hole and attached to the carrier; a pinion gear that is disposed in a pinion gear installation space and is rotatably supported by the pinion shaft inserted into the shaft insertion hole, and a pinion gear that penetrates in the radial direction at the end of the pinion shaft. A pin insertion hole is formed, and a fixing pin whose end protrudes from the outer peripheral surface of the pinion shaft is press-fitted into the pin insertion hole, and the outer surface of one of the left and right axial walls of the carrier A pin holding groove extending from the shaft insertion hole in the radial outer circumferential direction is formed, and when the pinion shaft is inserted into the shaft insertion hole, the end of the fixing pin is inserted into the pin holding groove. A pinion shaft fixing structure for a planetary gear, characterized in that a holding member is attached to an outer surface of the one wall of the carrier so as to cover the pin holding groove.