JPH08145150A - Differential gear - Google Patents

Abstract

PURPOSE: To provide a differential gear advantageously obtained in a manufacturing surface from the surface of a pinion gear. CONSTITUTION: A pair of pinion gears 14 and 14 and side gears 15 and 16 are supported in the gear housing space S of a differential gear case 12 having a ring gear 13 in its one end side. For the pinion gear 14, z gear having a gear main body 14a and a supporting part 14b simultaneously formed as integral parts is employed and thereby work of manufacturing the pinion gear 14 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a differential gear case including a pair of side gears, a pair of pinion gears meshing with the pair of side gears, a differential case for accommodating the pair of side gears and a pinion gear and pivotally supporting the differential gears. Motion equipment.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned differential device, as shown in FIG. 8, a differential gear is constructed by penetrating a pair of pinion gears 14, 14 and a differential gear case 12, and by a retaining pin 21. The pinion gear 14 is supported by the differential case 12 by adopting the support pin 22 configured to prevent the pinion gear 14 from coming off from the case 12.

[0003]

Conventionally, it was necessary to make a support pin separately from the pinion gear. Furthermore, a retaining means is required to prevent the support pin from coming off the differential case, which is disadvantageous in terms of structure and manufacturing. An object of the present invention is to provide a differential device which can be advantageously obtained in terms of structure and manufacturing.

[0004]

In order to achieve the object, a differential device according to the present invention is the same as the one described at the beginning, and the gear main body portion of each of the pair of pinion gears and the gear main body portion are connected to the differential gear unit. It is characterized in that the support shaft part attached to the case is an integrally molded part.

Either a dividable type case formed by connecting a plurality of divided case portions or a non-dividable type case formed as an integral part may be employed as the differential gear case. When the impermeable case is adopted, it is advantageous as follows to adopt the configuration according to claim 2.

[0006]

[Action] Due to the meshing of the side gear and the pinion gear, the side gear acts as a stopper on the gear main body of the pinion gear so as to restrict the movement of the side gear to the inside of the differential gear case, and into the differential gear case mounting hole of the pinion gear support shaft portion. The actuator case acts as a stopper on the gear main body of the pinion gear to restrict the movement of the pinion gear toward the outside of the differential case. Since the gear main body of the pinion gear and the support shaft are connected by an integral part, the gear main body of the pinion gear and the main body of the pinion gear need not necessarily be provided without special retaining means such as a conventional retaining pin. The pinion gear is supported on the differential case so that the support shaft does not move significantly inward or outward with respect to the differential case, or does not come off and interfere with the engagement or rotation of the side gear of the pinion gear. To be made.

When the construction according to claim 2 is adopted, even if a non-dividable type case is adopted as the differential case, it can be assembled using the following assembling method. That is, after the pinion gear is assembled, the side gear is inserted into the side gear case such that the side gear engages with both pinion gears through the through hole and enters the differential gear case. After this, insert the output shaft into the output shaft mounting boss from the outside of the differential case while supporting the side gear so that it is concentric with the output shaft mounting boss of the differential case. Insert the end of the shaft into the side gear with the end protruding into the differential case.

[0008]

EFFECT OF THE INVENTION Since the gear main body portion that hits the conventional pinion gear and the support shaft portion that hits the conventional support pin are integral parts and can be made at once, it is not always necessary to provide a special retaining means. As a result, the manufacturing labor can be reduced, the structure can be simplified, and the manufacturing cost can be reduced.

When the structure according to claim 2 is adopted, the pinion gear and the side gear can be incorporated in the differential gear case in a predetermined manner even if the non-dividable type case which is an integral part as a whole is adopted as the differential gear case. As the pinion gear, a gear that is an integral part of the gear main body and the support shaft is adopted to reduce the manufacturing labor and to simplify the structure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in FIG. 1, an axle case 1 is provided on both ends of the axle case Y in the vertical direction of the machine so that steering operation of wheels W can be performed.
The front wheel drive case 2 is connected to an intermediate portion of a front wheel drive case 2 that is swingable around the front wheel drive case 2 while being connected to a pair of front and rear wheel support portions 3 of a tractor body frame (not shown).
Is configured to swing up and down with respect to the machine frame about a pivot axis X in the machine front-rear direction of the wheel support portion 3. Axle drive gear 5, rotary shaft 6, on the left and right axles 4,
Also, the differential gear 10 that is interlocked via the rotary shaft 7 or 8 is installed near the wheel support portion 3 of the front wheel drive case 2 and one of the pair of wheel support portions 3 is provided. A rotary shaft 9 that is inserted concentrically with the axis X is configured to transmit rotational force from a traveling mission (not shown) to a differential device 10, and thus a pair of left and right front wheels W, The front wheel mounting portion of the agricultural tractor is configured so that W can be steered, driven, and swingably moved up and down to be mounted on the machine body frame.

As shown in FIG. 3, the front wheel drive case 2 is provided.
Differential case 12 rotatably supported inside a central portion 2a made of a circular steel pipe via a pair of left and right ball bearings 11, 11, and a ring gear support portion 12a on one end side of the differential case 12. Ring gear 1 fitted on the outside
3. A pair of pinion gears 14, 14 housed in a gear housing space S located between the bearings of the differential case 12.
And the side gears 15 and 16, the rotary shaft 7 for driving the left wheel, which penetrates through the ends of the differential gear case 12 on the side opposite to the ring gear 13 side, and the differential gear case 12.
The differential device 10 is constituted by the rotating shaft 8 for driving the right wheel, which penetrates the ring gear support portion 12a of FIG.

That is, the ring gear 13 rotates integrally with the differential case 12 by meshing by spline engagement with the ring gear supporting portion 12a, and meshes with the bevel gear portion 9a of the rotary shaft 9, so that the rotary shaft It is driven to rotate by 9 to drive the differential case 12 so as to rotate around the axes of the rotary shafts 7 and 8. Each of the pair of pinion gears 14, 14 includes a bevel gear type gear main body portion 14a and a gear main body portion 14a.
The support shaft portion 14b protruding from is a bevel gear integrally formed by forging molding or casting, and the support shaft portion 14b is rotatably mounted in the mounting hole 12b of the differential case 12. A shaft of the differential case 7 so as to rotate relative to the differential case 12 around the axis of the support shaft portion 14b and to rotate together with the differential case 7 around the axis of the rotary shafts 7 and 8. It is supported. One of the pair of side gears 15 and 16 has one side gear 15 on the side opposite to the ring gear 13 side with respect to the pair of pinion gears 14 and 14.
4 and 14 are arranged so as to mesh with the respective gear main body portions 14a, and are attached to the end portion 7a of the left wheel drive rotating shaft 7 projecting into the differential case 12, and the spline engagement with the shaft end portion 7a is performed. Is configured to rotate integrally with the left wheel drive rotating shaft 7 by meshing with each other, so that the left wheel drive rotating shaft 7 can rotate relative to the differential case 12 around the axis of the left wheel drive rotating shaft 7, and The differential case 12 is pivotally supported so that the rotational force of the motive case 12 can be transmitted from the pinion gear 13 to the left wheel drive rotating shaft 7. The other side gear 16 of the pair of side gears 15 and 16 is the pair of pinion gears 14 and 1.
4, the ring gear 13 is located on the side where the ring gear 13 is located so as to mesh with the respective gear body portions 14a of the pair of pinion gears 14, 14 and the end of the right wheel drive rotary shaft 8 that projects into the differential case 12 While attaching to the part 8a,
By being configured to rotate integrally with the right wheel driving rotary shaft 8 by meshing with the shaft end portion 8a by spline engagement, the differential case 12 is formed around the axis of the right wheel driving rotary shaft 8. The differential case 12 is rotatably supported so that the rotational force of the differential case 12 can be relatively rotated and can be transmitted from the pinion gear 13 to the right wheel drive rotating shaft 8.

That is, the turning power of the rotary shaft 9 is applied to the ring gear 1.
3 and inputs the rotational force of the ring gear 13 via the differential case 12 and the pinion gear 14 to the side gear 1
5 and 16, the left wheel drive rotation shaft 7 is used as an output shaft to the left wheel side, and the rotational force of the rotation shaft 7 is transmitted to the left wheel W, and the right wheel drive rotation shaft 8 is transmitted to the right wheel side. As the output shaft to the right wheel W, the turning force of the rotary shaft 8 is transmitted to the right wheel W. The left and right wheels W are differentially transmitted by enabling the differential between the left wheel driving rotary shaft 7 and the right wheel driving rotary shaft 8 by the action of the pinion gear 14. Furthermore, the side gears 15 and 16 mesh with the gear main body portion 14a of the pinion gear 14 to restrict the movement of the pinion gear 14 so that the pinion gear 14 does not move largely inside the differential gear case 12, and the differential gear case 12 is The gear body portion 14 of the pinion gear 14 is provided around the assembly hole 12b.
By restricting the movement of the pinion gear 14 so as not to move the pinion gear 14 to the outside of the differential gear case 12 by coming into contact with a, the gear body 14a of the pinion gear 14 is a separate component. Support pin with differential case 1
The pinion gear 14 is maintained in a predetermined assembled state while omitting the retaining means for the support pin which is required when the pinion gear 14 is pivotally supported on the pinion gear 14.

The side gear 15 is attached only to the end portion 7a of the rotary shaft 7 for driving the left wheel that protrudes inside the differential gear case 12, and the rotary shaft 7 for driving the left wheel is also used as a support shaft in the differential gear case 12. The side gear 16 is rotatably supported, and is attached only to the end portion 8a of the right wheel driving rotary shaft 8 projecting inside the differential case 12, and the right wheel driving rotary shaft 8 is also used as a spindle. The case 12 is pivotally supported. As shown in FIGS. 4 and 5, the output shaft mounting boss portion 12 through which the left wheel driving rotary shaft 7 of the differential case 12 penetrates.
c and the ring gear support portion 12a as the output shaft mounting boss portion through which the right-wheel drive rotary shaft 8 penetrates, and these boss portions 12a and 12c are sandwiched and are opposite to each other. A pair of through holes 12d, 12e for incorporating gears are formed on the side. As a result, although the differential case 12 is not a dividable type case in which a plurality of divided case portions are connected, but a non-dividable type case formed integrally as a whole,
In addition, although the gear body 14a and the support shaft portion 14b are gears that are integral parts as the pinion gear 14, by adopting the assembly method shown in FIGS. , 16
Can be incorporated in the differential case 12.

That is, as shown in FIG. 6, the differential case 12 after the pair of pinion gears 14, 14 has been assembled.
One side gear 15 has one through hole 12d or 1
2e enters the gear accommodating space S while meshing with both pinion gears 14, 14, and the other side gear 16 passes through the other through hole 12e or 12d to both pinion gears 14,
Both side gears 15 and 16 are inserted into the gear accommodating space S such that the side gears 15 and 16 are engaged with the gear accommodating portion 14 and enter the gear accommodating space S. After that, the left wheel driving rotary shaft 7 is supported by the output shaft mounting boss 12c while supporting the side gear 15 so as to be concentric with the output shaft mounting boss 12c.
Is inserted from the outside of the differential gear case 12 into the gear housing space S of the differential gear case 12 by inserting the end portion 7a of the left wheel driving rotary shaft 7 into the gear housing space S and inserting the side gear 15 into the gear housing space. Assemble S to work as desired. The side gear 16 is similarly assembled. That is, as shown in FIG. 7, while supporting the side gear 16 so as to be positioned concentrically with the output shaft mounting boss portion 12a, the right wheel drive rotating shaft 8 is mounted on the output shaft mounting boss portion 12a. It is inserted from the outside of the motive case 12, the end portion 8a of the right wheel drive rotating shaft 8 is projected into the gear housing space S, and is inserted into the side gear 16.

The axle case 1 is connected to the end portion 2b of the front wheel drive case 2 which is a cast case, by the connecting structure shown in FIG. That is, one end side of the connecting portion 1a of the axle case 1 is supported by the front wheel drive case portion 2b via the ball bearing 17, and the other end side of the connecting portion 1a provided with the lubricating oil groove 18 is the front wheel drive case portion 2b. The connecting portion 1a is rotatably fitted on the front wheel drive case portion 2b so as to be directly contacted with and supported by the front wheel drive case portion 2b. The axle case 1 is configured to support the vehicle body load applied to the front wheel drive case portion 2b mainly through the ball bearings 17, and the retaining ring 19 attached to the end of the front wheel drive case portion 2b is thrust. The axle case 1 is configured to be prevented from coming off from the front wheel drive case 2 by receiving the connecting portion 1a via the collar 20.

[Other Embodiments] When a non-dividable type case is adopted as the differential case as in the above-described example, the connecting structure required for connecting the divided case portions in the case of the dividable type case becomes unnecessary. Therefore, the differential case has a simple structure and becomes compact. As a result, when the differential device is installed in the steel pipe drive case, the effect that the drive case can be advantageously formed can be obtained, for example, a steel pipe having a diameter as small as possible can be adopted. However, even if a dividable case is adopted as the differential case, if a pinion gear in which the gear body and the support shaft are integrated parts is adopted, it is advantageous in terms of manufacturing labor and structure. Is the same. Therefore, the present invention can also be applied to the case where a dividable case is used as the differential case to configure the differential device.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Partially developed view of front wheel mounting part of agricultural tractor

FIG. 2 is a sectional view of an axle case mounting portion.

FIG. 3 is a sectional view of an actuator.

FIG. 4 is a plan view of an actuator case.

FIG. 5 is a front view of an actuator case.

FIG. 6 is an explanatory diagram of a side gear assembly procedure.

FIG. 7 is an explanatory diagram of a side gear assembly procedure.

FIG. 8 is a sectional view of a conventional actuator.

[Explanation of symbols]

 7,8 Output shaft 12 Differential case 12a, 12c Output shaft mounting boss 12d, 12e Through hole 14 Pinion gear 15, 16 Side gear

Claims (2)

[Claims] 1. A pair of side gears (15, 16), a pair of pinion gears (14, 14) meshing with the pair of side gears (15, 16), and the pair of side gears (1).
5, 16) and a pinion gear (14, 14) and a differential case (12) that pivotally supports the pinion gear (14, 14), wherein each of the pair of pinion gears (14, 14) is provided. The gear body (14a) is rotatably assembled in the mounting hole (12b) of the differential case (12), and the gear body (14a) is rotatably attached to the differential case (12). A differential device which is an integral part in which the support shaft portion (14b) is simultaneously molded. 2. The pair of side gears (15, 16)
Is connected only to the ends of the output shafts (7, 8) projecting inside the differential case and is axially supported by the differential case (12) via the output shafts (7, 8). The pair of pinion gears (14, 14) and side gears (15, 1)
Through holes (12d, 12e) for incorporating 6) into the differential case (12) are provided between the pair of output shaft mounting boss portions (12a, 12c) of the differential case (12). The differential device according to claim 1.