JPH0451239Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lubrication mechanism in a final reduction gear.

[Prior art]

One type of final reduction gear is a differential that constitutes a final reduction mechanism housed in a case formed by a differential carrier and a carrier cover that seals its front end opening or rear end opening. Each side gear shaft is rotatably supported by the left and right sides of the case at both left and right ends, and is connected to each side gear forming the differential so as to be able to transmit torque. There is a final reduction gear which passes through the carrier cover in a tight and rotatable manner and is provided with a breather plug provided on the upper part of the carrier cover to communicate the inside and outside of the case.

In this type of final reduction gear, the lubricating oil scraped up by the ring gear making up the final reduction mechanism is used to lubricate the differential, shaft supports and seals of each side gear shaft. A rib is provided on the inner wall of the carrier cover as a means for guiding the lubricating oil to a required location. FIG. 7 shows an example of a carrier cover 1, in which a first rib 2 guides lubricating oil to either the left or right side of each shaft support or seal part.
A and a second rib 2b leading to the other side are provided.

On the other hand, in the final reduction gear, the mounting hole for the breather plug 4 is located in the upper part of the carrier cover 1, so the lubricating oil scraped up by the ring gear scatters into the mounting hole and flows from the mounting hole to the outside. There is a risk of leakage. To deal with this, Akira Jitsukai
Similar to the cover body, deflector, etc. provided on the case of the gear transmission shown in Publication No. 58-142461,
It is conceivable to provide a plate-shaped deflector 3 near the plug mounting hole of the carrier cover 1 to shield the plug mounting hole from the lubricating oil scraped up.

[Problem that the invention attempts to solve]

By the way, there is a deflector 3 on the carrier cover 1.
7, the lower end of the deflector 3 comes close to the first rib 2a, and as more lubricating oil is scraped up by the ring gear, the same lubricating oil is transferred to the first rib 2a. There is a risk that the plug 4 may remain between the rib 2a and the deflector 3 below the attachment hole of the plug 4 and leak from the attachment hole.

[Means for solving problems]

In order to solve this problem, the present invention provides a final reduction gear of the type described above, in which a ring gear constituting the final reduction mechanism scrapes a mounting hole for the breather plug in the vicinity of the breather plug inside the carrier cover. a blocking wall portion for blocking lubricating oil; a blocking wall portion that is integrally provided at a lower end portion of the blocking wall portion and protrudes toward the side opposite to the mounting hole of the breather plug to receive the lubricating oil; and the differential; The present invention is characterized in that a deflector is provided which includes a shaft support for each side gear shaft and a receiving portion that leads to the seal portion.

[Functions and effects of the idea]

With this configuration, the plug mounting hole of the carrier cover is shielded from the lubricating oil scraped up by the blocking wall portion of the deflector, while the scraped lubricating oil is received by the receiving portion of the deflector and the differential Axial support of each side gear shaft,
It is guided to the seal part and accurately lubricates these shaft supports and seal parts.

According to this configuration, even if a large amount of lubricating oil is scooped up, the lubricating oil does not stay below the plug mounting hole, and leakage of lubricating oil from the plug mounting hole is prevented. In addition, since the receiving portion of the deflector functions in the same manner as one of the conventional ribs,
One of such ribs can be omitted.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a final reduction gear equipped with the lubrication mechanism of the present invention. The final reduction gear is the one on the front side of a four-wheel drive vehicle, and is the sixth gear.
As shown in the figure, it is used in four-wheel drive vehicles based on a front engine/rear drive (FR vehicle). In this vehicle, both the left and right rear axle shafts can be driven at all times by a transmission 12 and a transfer shaft 13 installed at the rear of the engine 11, and a switching mechanism of the transfer shaft 13 allows power to be transmitted to the propeller shaft 14. It is configured to be intermittent. Therefore, both the left and right front axle shafts 15a and 15b connected to the final reduction gear F on the front side are driven during four-wheel drive, but are on the non-drive side during two-wheel drive.

The case of the final reduction gear F includes a differential carrier 21 (hereinafter referred to as differential carrier), a carrier cover 22 and an extension tube 2.
3, a carrier cover 22 is attached to the front end opening of the differential carrier 21 to seal the opening, and an extension tube 23 is attached to the left end opening of the differential carrier 21 and protrudes to the left. There is. A differential 30a, a final gear 30b, a disconnection mechanism 40, etc., which constitute a final reduction mechanism, are housed in this case.

The differential 30a includes a differential case 31 (hereinafter referred to as differential case), two pairs of pinion gears 32 (only one is shown), and a pair of left and right side gears 33, 34. It is rotatably supported by a differential carrier 21 and left and right half-cylindrical bearing caps 24a and 24b. The pinion gear 32 is rotatably supported by a pinion shaft and assembled in the differential case 31, and each side gear 33, 34 is rotatably supported by the differential carrier 31 and meshes with the pinion gear 32. The final gear 30b consists of a ring gear 35 and a drive pinion 36. The ring gear 35 is assembled to the outward flange of the differential case 31, and the drive pinion 36 is attached to the outer flange of the differential case 31.
The ring gear 3 is liquid-tightly and rotatably supported on the ring gear 3.
It meshes with 5. This drive pinion 36 is connected to the propeller shaft 14. In this differential 30a, the inner shafts 16a, 1 constituting each side gear shaft are
7a is connected to each side gear 33, 34 by spline fitting so that torque can be transmitted.

In each side shaft, the left side gear shaft consists of an inner shaft 16a and an outshaft 16b, and the outer shaft 16b is coaxially and relatively rotatably connected to the inner shaft 16a, and is connected to the extension tube 2.
The tube 23 is fluid-tightly and rotatably supported by the tube 23 and passes through the same tube 23. The right side gear shaft is the inner shaft 17a and the outer shaft 17.
A short piece consisting of b and an outer shaft 17
b is rotatably fitted onto the outer end of the inner shaft 17a, and is fluid-tightly and rotatably supported by the right end opening of the differential case 21, passing through the opening.

The disconnection mechanism 40 includes a coupling sleeve 41, a push rod 42, a fork shaft 43, a shift fork 44, and a negative pressure actuator 45. The coupling sleeve 41 connects external splines 16a1 and 16b provided on each end of both shafts 16a and 16b of the left side gear shaft.
The inner shaft 16 has an inner spline 41a that meshes with the outer spline 16a1 of the inner shaft 16a.
b meshes with the outer spline 16b1 and releases the mesh. The push rod 42 passes through each inner shaft 16a, 17a and the pinion shaft so as to be movable in the axial direction, and one end thereof is connected to the coupling sleeve 41 by a connecting pin 46 passing through a long hole 16a2 of the inner shaft 16a, and The other end is connected to the inner shaft 17a. As a result, the push rod 42 couples the inner shaft 17a to the coupling sleeve 4.
1, and when the sleeve 41 slides, the inner shaft 17a slides to engage the outer spline 17a1 of the shaft 17a and the inner spline 17b1 of the outer shaft 17b,
and release the mesh.

The fork shaft 43 is attached to the carrier cover 22 so as to be slidable in the axial direction, and is located in parallel to the left side gear shafts 16a, 16b, with a shift fork 44 attached to the intermediate portion thereof. The shift fork 44 engages the coupling sleeve 41. The negative pressure actuator 45 is connected to the fork shaft 4 in the carrier cover 22.
The housing 45a and the diaphragm 45b hermetically partition the inside of the housing 45a to form left and right pressure chambers R1 and R2. Both pressure chambers R1 and R2 are selectively communicated with a negative pressure source and the atmosphere via a vacuum switching valve (not shown), and the fork shaft 43 is intermittently moved in the axial direction due to the differential pressure generated by the switching action of the valve. to slide. In such a negative pressure actuator 45, when power to the propeller shaft 14 is cut off by the switching mechanism of the transfer 13, the left pressure chamber R1 communicates with the atmosphere and the right pressure chamber R2 communicates with the negative pressure source. Also, when the switching mechanism transmits power to the propeller shaft 14, the vacuum switching valve is switched so that the left pressure chamber R1 communicates with the negative pressure source and the right pressure chamber R2 communicates with the atmosphere.

In such an intermittent mechanism 40, the left pressure chamber R1 of the two-wheel drive negative pressure actuator 45, in which the power to the propeller shaft 14 is cut off, is communicated with the atmosphere, and the right pressure chamber R2 is communicated with a negative pressure source. .
Therefore, the fork shaft 43 and the shift fork 44 are in the position shown in FIG.
is in the state shown in the upper part of the figure, and both shafts 16a, 16b and 17 of each side gear shaft
The bond between a and 17b is blocked. Therefore, each front wheel is connected to the outer shaft 1 of each side gear shaft.
6b and 17b without driving the differential 30a, final gear 30b, propeller shaft 14, etc., which reduces noise generated from the non-drive system and reduces rotational resistance of the non-drive system. It is possible to improve fuel efficiency and reduce friction.

On the other hand, during four-wheel drive, the left pressure chamber R1 of the negative pressure actuator 45 communicates with the negative pressure source, and the right pressure chamber R2 communicates with the atmosphere. Therefore, the fork shaft 43 and the shift fork 44 are
Move the coupling sleeve 4 to the left in the figure.
1 and the push rod 42 to the left as shown in the lower part of the figure, the inner shaft 16a is coupled to the outer shaft 16b via the coupling sleeve 41, and the inner shaft 17a is directly coupled to the outer shaft 17b. The power input via the shaft 14 and drive pinion 36 and divided into the inner shafts 16a, 17a by the differential 30a is transmitted to the front axle shafts 15a, 15b via the outer shafts 16b, 17b. It will be 4-wheel drive.

Therefore, in the final reduction gear F, as shown in FIGS. 3 and 4, the carrier cover 22
Ribs 22a and 22b for guiding lubricating oil are formed on the inner wall of the inner wall, and both boss portions 22 formed on the inner wall of
The deflector 25 is attached to a pair of bolts 26a, 2
6b. Ribs 22a, 22
b guides the lubricating oil scraped up by the ring gear 35 to the right rear part of the carrier cover 22, and includes a roller bearing 18a that pivotally supports the right side of the differential case 31, a ball bearing 18b that pivotally supports the outer shaft 17b, and a seal member. Lubricate 18c etc.

On the other hand, the deflector 25 has an L-shaped side surface as shown in FIG. 4 and FIG. It is provided with a receiving part 25b. The deflector 25 is assembled to the upper side of the carrier cover 22 and located behind the mounting hole 22d of the breather plug 27, and the blocking wall 25a prevents the mounting hole 22d from the lubricating oil scraped up by the ring gear 35. A roller bearing 18 receives the lubricating oil through a receiving portion 25b that intercepts and projects rearward, guides it to the left rear part of the carrier cover 22, and pivotally supports the left side of the differential case 31.
d. Lubricate the sliding portion of the coupling sleeve 41, the seal member 18e of the outer shaft 16b, etc.

In this way, according to the final reduction gear F, the plug attachment hole 22d of the carrier cover 22 is blocked from the lubricating oil by the blocking wall 25a of the deflector 25, and the lubricating oil is transmitted to the receiving part 2 of the deflector 25.
5b, the roller bearing 18d, the sliding part of the coupling sleeve 41, and the sealing member 18.
With the deflector 25 having such a shape, even if a large amount of lubricating oil is scraped up, the lubricating oil will not remain below the plug attachment hole 22d. Therefore, lubricating oil does not leak from the mounting hole 22d, and the carrier cover 22
The rib that guides the lubricating oil to the left rear part can be omitted.

In this example, an example was shown in which the present invention was implemented in a front final reduction gear of a four-wheel drive vehicle, but the present invention is applicable to a rear final reduction gear of a front engine rear drive vehicle (FR vehicle). , the front final reduction gear of a front engine/front drive vehicle (FF vehicle), the rear final reduction gear of a four-wheel drive vehicle based on a FF vehicle, etc.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view of a final reduction gear device embodying the present invention, Fig. 2 is a partial vertical sectional view of the device, Fig. 3 is a front view showing the inside of the carrier cover, and Fig. 4 is the same as Fig. 3. 5 is a perspective view of the deflector, FIG. 6 is a schematic configuration diagram of a four-wheel drive vehicle equipped with the same device, and FIG. 7 is a front view showing the inside of the carrier cover of the conventional device. It is a diagram. Explanation of symbols, 21... Differential carrier, 22...
Carrier cover, 22a, 22b...rib, 22
d...Plug mounting hole, 25...Deflector, 2
5a...Blocking wall part, 25b...Receiving part, 27...
Breather plug, 30a...differential, 31...differential case, 30b...final gear, 35...ring gear, 40...intermittent mechanism,
F...Final reduction gear.

Claims (1)

[Scope of utility model registration request] A differential constituting a final reduction mechanism housed in a case formed by a differential carrier and a carrier cover that seals the front end opening or the rear end opening of the differential carrier is located at both left and right ends of the case. Each side gear shaft is rotatably supported on both left and right sides and is coupled to each side gear constituting the differential so as to transmit torque, and the side gear shafts liquid-tightly and rotatably penetrate the left and right sides of the case. In the final reduction gear, the carrier cover is provided with a breather plug on the upper part of the carrier cover for communicating the inside and outside of the case, wherein a mounting hole for the breather plug is provided in the vicinity of the breather plug inside the carrier cover. A blocking wall portion that blocks the lubricating oil scraped up by the ring gear constituting the final reduction mechanism; and a blocking wall portion that is integrally provided at the lower end of the blocking wall portion and protrudes toward the opposite side from the mounting hole of the breather plug to prevent the lubricating oil from being scraped up by the ring gear that constitutes the final reduction mechanism. A lubrication mechanism in a final reduction gear, characterized in that a deflector is provided with a receiving portion that receives the differential and guides the differential to the shaft support of each side gear shaft and the seal portion.