JP2012197918A - Transmission case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission case capable of responding to the requirement of reduction of the weight of a case by materializing the strength and stiffness as main characteristics required for a case element although the case is formed as a composite material structure.SOLUTION: The transmission case is configured such that a main variable-speed case 1, a converter housing 2 and a side cover 3 which are divided are joined to each other by flanges such that internal shaft members of a belt type continuous variable velocity transmission 4 are supported rotatably. In the transmission case TC, the side cover 3 has a composite material structure composed of a metal frame 5 and a resin cover 6. The metal frame 5 includes: the whole circumference flange 51 continuing over the whole circumference of a divided opening part; a first bearing support boss 52 and a second bearing support boss 53 which rotatably support fixed sheave shafts 42e, 43e and a reinforcing arm 56 which joins the whole circumference flange 51 and both bearing support bosses 52, 53. The resin cover 6 blocks an opening part formed by the metal frame 5.

Description

  The present invention relates to a transmission case that is configured by flange-joining a plurality of divided case elements, and rotatably supports a shaft member of a transmission mechanism that is assembled therein.

  2. Description of the Related Art Conventionally, a crankcase cover for a vehicle engine in which the crankcase cover is configured by a metal bearing holder and a synthetic resin cover body for the purpose of providing a lightweight crankcase cover for a vehicle engine is known ( For example, see Patent Document 1).

JP 2000-18348 A

  However, in the conventional crankcase cover of a vehicle engine, the metal bearing holder is composed of a bearing holding portion, a leg portion, and a reinforcing portion, and these portions are integrally formed. And the front-end | tip part of the said leg part is being fixed to the crankcase half part with the synthetic resin cover main body. As described above, the conventional metal bearing holder is simply a bearing holding portion reinforcing structure for ensuring the shaft support rigidity, so that the entire crankcase cover has strength (static strength, fatigue strength) and rigidity. It is not a frame structure having a full circumference flange.

  For this reason, when a conventional cover structure is applied to the side cover of a vehicle transmission case configured by flange-joining a plurality of divided case elements, for example, if repeated torsional force is applied, the torsional strength is insufficient. Allow torsional deformation of the case. That is, there is a problem that strength (static strength, fatigue strength) and rigidity, which are the main required characteristics required for transmission case elements, cannot be established, and it is impossible to meet the demand for weight reduction of transmission cases. there were.

  The present invention has been made paying attention to the above-mentioned problems, and can meet the demand for weight reduction of the case by establishing the strength and rigidity which are the main required characteristics required for the case element while having a composite structure. An object is to provide a transmission case that can be used.

In order to achieve the above object, the present invention is provided with a transmission case that is configured by flange-joining a plurality of divided case elements and that rotatably supports a shaft member of a speed change mechanism assembled therein.
In this transmission case, at least one case element of the plurality of divided case elements has a composite material structure including a metal frame and a resin cover.
The metal frame has an all-around flange that is continuous over the entire circumference of the divided opening, a bearing support boss that rotatably supports the shaft member, and a reinforcing arm that connects the all-around flange and the bearing support boss. .
The resin cover closes an opening formed by the metal frame.

Therefore, a metal frame is constructed by connecting the all-around flange and the bearing support boss, which are continuous over the entire circumference of the divided opening, by the reinforcing arm. And by making it the composite material structure which added the resin cover to this metal frame, intensity | strength and rigidity are further reinforced. That is, the composite material structure having the entire circumference flange as the base member for ensuring the cover strength provides the strength (static strength, fatigue strength) and rigidity required for the case element.
Therefore, the mounting strength (static strength) of the bearing support boss that suppresses deformation or the like against external force is ensured, and the torsional strength (fatigue strength) that suppresses deformation or the like against repeated torsional force is ensured. Further, the bearing support rigidity when the shaft member of the speed change mechanism is rotatably supported with respect to the bearing support boss is also ensured.
As described above, by satisfying the strength and rigidity which are the main required characteristics required for the case element while having the composite material structure, it is possible to meet the case weight reduction requirement.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway view showing a belt-type continuously variable transmission mounted on an automobile to which a transmission case having a side cover with a composite material structure of Example 1 is applied. It is an external view which shows the outer surface of the side cover by the composite material structure of Example 1. FIG. 3 is an inner surface view showing an inner surface of a side cover having a composite structure according to Embodiment 1. FIG. It is the sectional view on the AA line of FIG. 2 and FIG. 3 which shows the side cover by the composite material structure of Example 1. FIG. FIG. 4 is a cross-sectional view taken along line B-B in FIGS. 2 and 3, illustrating a side cover having a composite material structure of Example 1.

  Hereinafter, the best mode for realizing the transmission case of the present invention will be described based on Example 1 shown in the drawings.

First, the configuration will be described.
FIG. 1 shows a belt-type continuously variable transmission mounted on an automobile to which a transmission case having a side cover having a composite material structure according to a first embodiment is applied. The overall configuration will be described below with reference to FIG.

  As shown in FIG. 1, the transmission case TC of the first embodiment is constructed by flange-joining the divided main transmission case 1 (case element), converter housing 2 (case element), and side cover 3 (case element). Is done. And each shaft member of the belt type continuously variable transmission mechanism 4 (transmission mechanism) assembled inside is rotatably supported.

  The belt type continuously variable transmission mechanism 4 is a continuously variable transmission that continuously changes a pulley ratio, which is a ratio of the input rotational speed of the transmission input shaft 40 and the output rotational speed of the transmission output shaft 41, by changing the belt contact diameter. It has a function. The belt type continuously variable transmission mechanism 4 includes a primary pulley 42, a secondary pulley 43, and a belt 44.

  The primary pulley 42 includes a primary fixed sheave 42a and a primary movable sheave 42b. A fixed sheave shaft 42e is integrally formed with the primary fixed sheave 42a, and a hollow cylindrical movable sheave shaft 42f is formed integrally with the primary movable sheave 42b in a coaxial arrangement with the fixed sheave shaft 42e. Then, due to the primary pressure guided to the primary pressure chamber 45, the movable sheave shaft 42f and the primary movable sheave 42b slide in the axial direction with respect to the fixed sheave shaft 42e.

  The secondary pulley 43 includes a secondary fixed sheave 43a and a secondary movable sheave 43b. A fixed sheave shaft 43e is integrally formed with the secondary fixed sheave 43a, and a hollow cylindrical movable sheave shaft 43f is formed integrally with the secondary movable sheave 43b in a coaxial arrangement with the fixed sheave shaft 43e. The movable sheave shaft 43f and the secondary movable sheave 43b slide in the axial direction with respect to the fixed sheave shaft 43e by the secondary pressure guided to the secondary pressure chamber 46.

  The belt 44 is wound around a pair of primary sheave surfaces 42 c and 42 d forming a V shape of the primary pulley 42 and a pair of secondary sheave surfaces 43 c and 43 d forming a V shape of the secondary pulley 43. The belt 44 includes two sets of stacked rings in which a large number of annular rings are stacked from the inside to the outside, and a large number of elements that are annularly connected to each other by sandwiching the two sets of stacked rings.

  In the transmission case TC of the first embodiment, of the main transmission case 1, the converter housing 2, and the side cover 3 that are flange-coupled, the main transmission case 1 and the converter housing 2 have a metal structure, and the side cover 3 has a composite structure. Yes.

  The main transmission case 1 is made of, for example, a metal part made of aluminum die casting (ADC12 or the like), and has circumferential flanges 11 and 12 having a plurality of bolt holes formed at both ends. All-around flange 11 is flange-coupled to converter housing 2, and all-around flange 12 is flange-coupled to side cover 3.

  The converter housing 2 is formed of, for example, a metal part made of aluminum die casting (ADC12 or the like), and has an all-around flange 21 having a plurality of bolt holes formed on the main transmission case 1 side. The all-around flange 21 of the converter housing 2 is flange-coupled to the all-around flange 11 of the main transmission case 1.

  The side cover 3 has a composite material structure in which a metal frame 5 made of a metal material and a resin cover 6 made of a synthetic resin material are combined. The metal frame 5 is made of, for example, aluminum die casting (ADC12 or the like) as a material, and the resin cover 6 is made of, for example, a high-strength resin (GF reinforced PA66 or the like) having heat resistance and oil resistance. The main transmission case 1 has an all-around flange 51 having a plurality of bolt holes. The all-around flange 51 of the side cover 3 is flange-coupled to the all-around flange 12 of the main transmission case 1.

  2-5 shows the structure of the side cover 3 by the composite material structure of Example 1. FIG. Hereinafter, a detailed configuration of the side cover 3 will be described with reference to FIGS.

  The side cover 3 is formed by removing the metal frame 5 disposed inside the belt-type continuously variable transmission mechanism 4 and the portion of the metal frame 5 where the metal surface is left exposed. And an outer resin cover 6 that is closely attached and covered.

  The metal frame 5 includes, as structural members, an all-around flange 51, a first bearing support boss 52 (bearing support boss), a second bearing support boss 53 (bearing support boss), and a vehicle body support boss 54. , A component mounting boss 55, a reinforcing arm 56, and a hydraulic path arm 57.

  The all-around flange 51 is flange-coupled to the all-around flange 12 of the main transmission case 1 and, as shown in FIGS. 1 and 3, the flange alignment is continuous over the entire circumference of the divided opening with the main transmission case 1. A surface 51a is provided. In addition, as shown in FIG. 3, a plurality of bolt holes 51b are formed in the entire circumferential flange 51.

  The first bearing support boss 52 has a recess for fitting the first bearing 7. As shown in FIG. 1, the end of the fixed sheave shaft 42 e (shaft member) of the primary pulley 42 is connected to the first bearing 7. It is supported rotatably via

  The second bearing support boss 53 has a recess for fitting the second bearing 8. As shown in FIG. 1, the end of the fixed sheave shaft 43 e (shaft member) of the secondary pulley 43 is connected to the second bearing 8. It is supported rotatably via

  The vehicle body support boss 54 has a mount surface 54a for bolting the bracket of the mount member 10 and supports the side cover 3 (case element) to the vehicle body 9 via the mount member 10 as shown in FIG. . The vehicle body support boss 54 is formed integrally with the first bearing support boss 52.

  As shown in FIG. 1, the component mounting boss 55 has a bolt seat surface 55a for fixing a mounting component from the outside such as a bearing position regulating component. The component mounting boss 55 is formed integrally with the second bearing support boss 53.

  As shown in FIGS. 1 and 3, the reinforcing arm 56 includes an all-around flange 51 and bosses (first bearing support boss 52, second bearing support boss 53, vehicle body support boss 54, and component mounting boss 55). The arm members are connected to each other in the radial direction, the circumferential direction, and the axial direction. The arm diameter and arm layout of the reinforcing arm 56 are set after repeated calculations and experiments so that required strength and rigidity can be established.

  As shown in FIG. 1, the hydraulic path arm 57 is an arm member that forms a secondary lubricating pressure oil path 13 (hydraulic path) inside and also serves as a reinforcing function. The hydraulic path arm 57 is formed integrally with the second bearing support boss 53. Here, the first bearing support boss 52, the component mounting boss 55, the all-around flange 51, the reinforcing arm 56, and the hydraulic path arm 57 are integrally formed.

  The resin cover 6 is configured such that the entire metal frame 5 is in close contact and covered from the outside, except for the portion of the metal frame 5 where the metal surface remains exposed. Here, the portions where the metal surface is left exposed are the flange-matching surface 51a (FIG. 4) of the all-around flange 51, the mount surface 54a (FIG. 5) of the vehicle body support boss 54, and the bolt seat surface 55a of the component mounting boss 55. (Fig. 1), etc. Further, to cover the entire metal frame 5 in close contact means to fix the resin cover 6 in close contact with the outer half peripheral surface region of the reinforcing arm 56 (FIG. 4), outside the first bearing support boss 52 and the hydraulic path arm 57. This means that the resin cover 6 is firmly fixed along the peripheral surface (FIG. 1).

  As shown in FIGS. 4 and 5, the metal frame 5 and the resin cover 6 are joined together with the structural members (the entire peripheral flange 51, the vehicle body support boss 54 that need to leave the metal surface exposed in the metal frame 5. The component mounting boss 55) is formed by concave / convex biting with a simple insert of the resin cover 6. That is, the protrusions 58 are formed in advance on necessary portions of the constituent members (the entire peripheral flange 51, the vehicle body support boss 54, and the component mounting boss 55) that need to leave the metal surface exposed in the metal frame 5. And the metal frame 5 which formed the protrusion 58 in the resin mold is set, and insert molding which injects molten resin in the mold space is performed. By this insert molding, the molten resin flows so as to wrap around the ridge 58, and when the resin is cured, the concavo-convex biting joining is performed.

Next, the operation will be described.
The effects of the transmission case TC of the first embodiment are as follows: “Vehicle transmission problem”, “Strength / rigidity establishment action”, “Oil sealability establishment action”, “Lubrication hydraulic path securing action”, “Built-in component layout establishment establishment action” It is divided and explained.

[Vehicle transmission issues]
Currently, there is a strong demand for weight reduction of vehicle transmissions mounted on vehicles. As part of the weight reduction of the vehicle transmission, for example, material replacement such as changing the oil pan to a synthetic resin oil pan has already been carried out.

  However, the transmission case (main transmission case, converter housing, side cover), which is a box component, occupies a large proportion of the components of the vehicle transmission, so the transmission case is lighter. It is a problem.

  This transmission case mainly has required characteristics that strength (static, fatigue) and rigidity are established. Therefore, among the case elements constituting the transmission case, an attempt was made to resinize the side cover that has the smallest characteristic value that satisfies the required characteristics and the smallest problem to be overcome in the resinization.

  However, the material replacement simply replacing the metal material with the resin material cannot satisfy the shaft support strength and rigidity, and the main required characteristics of strength (static, fatigue) and rigidity cannot be established. For this reason, as is apparent from the fact that no resin side cover has been implemented so far, it has been impossible to replace the side cover with a resin.

  On the other hand, it is proposed that a compact four-wheeled vehicle for running on rough terrain is composed of a composite material of a metal bearing holder and a synthetic resin cover body for the purpose of reducing the weight of a crankcase cover of a vehicle engine. (Japanese Unexamined Patent Publication No. 2000-18348). However, the metal bearing holder is simply a structure that reinforces the bearing holder to ensure the shaft support rigidity, and the entire circumference flange to give the crankcase cover strength (static strength, fatigue strength) and rigidity. It is not a frame structure having

  For this reason, when the proposed cover structure is applied to the side cover of a transmission case for a vehicle that has a higher required characteristic value than a small four-wheel vehicle for running on rough terrain, for example, if repeated torsional force is applied, the torsional strength is insufficient. This allows torsional deformation of the case. Furthermore, the mating surface with the crankcase half is a partial metal mating surface formed only by the tip of the leg, and oil leakage is allowed from the mating surface of the other metal and resin. In other words, strength (static strength, fatigue strength), rigidity, and oil sealability, which are the main required characteristics required for transmission case elements, cannot be established, and transmission case weight reduction requirements cannot be met. .

By the way, as the main required characteristics required for the side cover of the transmission case for vehicles,
(a) Strength (static, fatigue) and rigidity
(b) Oil sealability
(c) Securing the lubrication hydraulic path
(d) Built-in component layout is feasible.

[Strength and rigidity formation]
As described above, it is necessary to establish strength and rigidity among the main required characteristics of the side cover 3. Hereinafter, the strength / rigidity establishing action reflecting this will be described.

  In Example 1, the side cover 3 has a composite material structure including the metal frame 5 and the resin cover 6. The metal frame 5 includes an all-around flange 51 continuous over the entire circumference of the divided opening, a first bearing support boss 52 and a second bearing support boss 53 that rotatably support the fixed sheave shafts 42e and 43e, It has a reinforcing arm 56 that connects the peripheral flange 51 and both bearing support bosses 52, 53. Further, the resin cover 6 employs a configuration that closes an opening formed by the metal frame 5.

  That is, the metal frame 5 is constructed by connecting the entire circumferential flange 51 and both bearing support bosses 52 and 53 by the reinforcing arm 56 over the entire circumference of the divided opening. And by making it the composite material structure which added the resin cover 6 to this metal frame 5, intensity | strength and rigidity are further reinforced. That is, strength (static strength, fatigue strength) and rigidity required for the side cover 3 are given by the composite material structure in which the circumferential flange 51 is a base member for ensuring cover strength.

  Therefore, the mounting strength (static strength) of the two bearing support bosses 52 and 53 that suppresses deformation and the like with respect to external force is ensured. In addition, the torsional strength (fatigue strength) of both bearing support bosses 52 and 53 that suppresses deformation and the like due to repeated torsional forces is ensured. Further, the bearing support rigidity when the fixed sheave shafts 42e and 43e of the belt type continuously variable transmission mechanism 4 are rotatably supported by the both bearings 7 and 8 with respect to the both bearing support bosses 52 and 53 is also secured. That is, the strength and rigidity of the main required characteristics of the side cover 3 are established.

[Oil sealing performance establishment effect]
As described above, it is necessary to establish the oil sealability among the main required characteristics required for the side cover 3. Hereinafter, the effect of establishing the oil seal property reflecting this will be described.

  When describing the oil seal property that suppresses oil leakage from the belt-type continuously variable transmission mechanism 4 built in the transmission case TC to the outside of the case, the oil leakage from the mating surface of the side cover 3 and the main transmission case 1 is suppressed. In addition, it is necessary to ensure that oil leakage from the joint between the metal frame 5 and the resin cover 6 is suppressed.

  Regarding the oil leak from the former mating surface, in Example 1, the flange mating surface 51a continuous over the entire circumference of the divided opening is not covered or closed by the resin cover 6 and the metal surface is exposed. The structure to leave is adopted.

  With this configuration, when the divided main transmission case 1 and the side cover 3 are flange-coupled to each other, the entire circumference of the divided opening of the main transmission case 1 and the entire circumference of the divided opening of the side cover 3 are metal mating surfaces. It becomes. Therefore, for example, oil leakage from the mating surfaces of the adjacent main transmission case 1 and the side cover 3 can be reliably suppressed by sandwiching the packing between the metal mating surfaces of the main transmission case 1 and the side cover 3 with bolts.

  Regarding the oil leak from the latter joint portion, in the first embodiment, the resin cover 6 and the constituent members that need to leave the metal surface exposed in the metal frame 5 (the entire circumference flange 51, the vehicle body support boss 54, the parts A configuration was adopted in which the joint with the mounting boss 55) was an uneven biting joint.

  With this configuration, even when high-pressure oil tries to leak from the inner surface of the joint portion between the metal frame 5 and the resin cover 6, the oil leak is reliably suppressed by the concave / convex engagement joint surface having a labyrinth structure. In addition, when the concave-convex engagement is used, the bonding strength between the metal frame 5 and the resin cover 6 is increased, and the function of reinforcing the strength and rigidity of the side cover 3 is also provided.

  Therefore, the side cover 3 is required by reliably suppressing the oil leak from the mating surface between the side cover 3 and the main transmission case 1 and the oil leak from the joint between the metal frame 5 and the resin cover 6. Of the main required characteristics, this is true for oil sealability.

[Lubricating hydraulic path securing action]
As described above, it is necessary to secure the lubricating hydraulic pressure path among the main required characteristics required for the side cover 3. Hereinafter, the lubrication hydraulic path securing operation reflecting this will be described.

  In the first embodiment, the metal frame 5 has a configuration including the hydraulic path arm 57 in which the secondary lubricating pressure oil path 13 is formed.

  With this configuration, a lubricating hydraulic pressure path function is added to the metal frame 5, and the lubricating hydraulic pressure created by the control valve unit (not shown) passes through the secondary lubricating pressure hydraulic path 13 in an orderly manner. 43. The hydraulic path arm 57 is an arm that also functions as a side cover 3 to reinforce the strength and rigidity of the side cover 3.

  Therefore, a lubricating hydraulic pressure path is secured among the main required characteristics required for the side cover 3 while reinforcing the strength and rigidity of the side cover 3.

[Establishment of built-in component layout]
As described above, among the main required characteristics required for the side cover 3, it is necessary to establish built-in component layout. Hereinafter, the effect of establishing the built-in component layout that reflects this will be described.

  In the first embodiment, the metal frame 5 is disposed inside the belt-type continuously variable transmission mechanism 4 assembled therein, and the resin cover 6 is a metal frame except for a portion of the metal frame 6 where the metal surface is left exposed. A configuration was adopted in which the entire frame 5 was placed outside and closely covered.

  With this configuration, even if the thickness of the resin cover 6 is increased in order to increase strength and rigidity, the outer diameter of the side cover 3 can be reduced without changing the volume of the internal space in which the belt type continuously variable transmission mechanism 4 is assembled. It will only be changed. That is, the layout of the belt-type continuously variable transmission mechanism 4 that is a built-in component is established regardless of changes in the thickness of the resin cover 6. In addition, the strength and rigidity of the side cover 3 are reinforced by covering the entire metal frame 5 closely with the resin cover 6.

  Therefore, the built-in component layout is established among the main required characteristics required for the side cover 3, regardless of changes in the thickness of the resin cover 6 for adjusting the strength and rigidity of the side cover 3.

Next, the effect will be described.
In the transmission case TC of the first embodiment, the effects listed below can be obtained.

(1) A shaft of a speed change mechanism (belt-type continuously variable speed change mechanism 4) which is constructed by flange-joining a plurality of divided case elements (main transmission case 1, converter housing 2, and side cover 3). In the transmission case TC that supports the member rotatably,
Of the plurality of divided case elements (main transmission case 1, converter housing 2, side cover 3), at least one case element (side cover 3) has a composite structure with a metal frame 5 and a resin cover 6,
The metal frame 5 includes a circumferential flange 51 continuous over the entire circumference of the divided opening, and a bearing support boss (first bearing support boss 52, first bearing support boss 52, which rotatably supports the shaft member (fixed sheave shafts 42e, 43e). 2 bearing support bosses 53), and reinforcing arms 56 that connect the all-around flange 51 and the bearing support bosses (first bearing support boss 52, second bearing support boss 53),
The resin cover 6 closes an opening formed by the metal frame 5.
For this reason, it is possible to meet the requirement for weight reduction of the case by establishing strength and rigidity, which are the main required characteristics required for the case element (side cover 3), while having a composite structure.

(2) The resin cover 6 leaves the metal surface exposed at least on the flange mating surface 41a of the circumferential flange 51.
For this reason, in addition to the effect of (1), oil leakage from the flange mating surfaces of the adjacent case elements (side cover 3 and main transmission case 1) can be suppressed.

(3) The resin cover 6 is made of a metal material for joining with structural members (the entire circumference flange 51, the vehicle body support boss 54, and the component mounting boss 55) that need to leave the metal surface of the metal frame 5 exposed. And resin material.
For this reason, in addition to the effect of (2), the joint strength between the metal frame 5 and the resin cover 6 can be increased to reinforce the strength and rigidity of the side cover 3, and from the joint between the metal frame 5 and the resin cover 6. Oil leakage can be suppressed.

(4) The metal frame 5 has a hydraulic path arm 57 in which a hydraulic path (secondary lubricating pressure oil path 13) is formed.
Therefore, in addition to the effects (1) to (3), the lubricating oil pressure is included in the main required characteristics required for the case element (side cover 3) while reinforcing the strength and rigidity of the case element (side cover 3). The securing of the route can be achieved.

(5) The metal frame 5 is arranged on the inner side toward the transmission mechanism (belt-type continuously variable transmission mechanism 4) assembled inside,
The resin cover 6 is an outer side that covers the entire metal frame 5 closely except for the portions of the metal frame 5 where the metal surface remains exposed (flange alignment surface 51a, mount surface 54a, bolt seat surface 55a). Arranged.
For this reason, in addition to the effects of (1) to (4), the case element (side cover 3) regardless of the thickness change of the resin cover 6 for adjusting the strength and rigidity of the case element (side cover 3). Among the main required characteristics required, the establishment of the built-in component layout can be achieved.

(6) The plurality of case elements include a main transmission case 1, a converter housing 2, and a side cover 3, and the side cover 3 has a composite material structure including a metal frame 5 and a resin cover 6.
For this reason, in addition to the effects (1) to (5), it is possible to achieve the resinization of the side cover 3 for which the problem to be overcome is the smallest among the case elements constituting the transmission case TC.

  The transmission case of the present invention has been described based on the first embodiment. However, the specific configuration is not limited to the first embodiment, and the gist of the invention according to each claim of the claims is described. Unless it deviates, design changes and additions are allowed.

  In the first embodiment, the metal frame 5 and the resin cover 6 are joined, as shown in FIGS. 4 and 5, with the protrusions 58 having a square cross section formed on the metal frame 5 and the concave and convex biting joints by a simple insert of the resin cover 6. An example was given. However, the cross-sectional shape of the protrusion is not limited to a square shape, and may be a triangular shape or a saddle shape as long as the bonding strength between the metal material and the resin material can be ensured.

  In the first embodiment, the example of the cover outer side arrangement in which the entire outer side of the metal frame 5 is adhered and covered with the resin cover 6 is shown. However, it may be an example of a cover inner arrangement in which the entire inner side of the metal frame is closely attached and covered with a resin cover. Furthermore, an example of a cover covering arrangement in which the entire metal frame is covered with a resin cover may be used. Moreover, it is good also as an example of the cover obstruction | occlusion arrangement | positioning which each block | closes the opening part of a metal frame with a resin cover, or closes | closes with a resin cover in a several opening part unit.

  In Example 1, the composite material structure of the present invention was applied to the side cover 3 of the transmission case TC. However, the composite material structure of the present invention may be applied to other case elements (main transmission case and converter housing) constituting the transmission case. Furthermore, it is good also as an example applied to two case elements among the case elements (main transmission case, converter housing, side cover) which comprise a transmission case, or an example applied to all the case elements.

  In the first embodiment, the application example to the belt type continuously variable transmission in which the belt type continuously variable transmission mechanism 4 is built in the transmission case TC is shown. However, an automatic transmission in which an automatic transmission mechanism having a plurality of shift stages is built in the transmission case, a toroidal continuously variable transmission in which a toroidal continuously variable transmission mechanism is built in the transmission case, and a parallel shaft type in the transmission case Of course, the present invention may be applied to transmissions other than the belt-type continuously variable transmission such as a manual transmission having a built-in transmission mechanism.

TC transmission case 1 Main transmission case (case element)
11, 12 All-around flange 2 Converter housing (case element)
21 Full circumference flange 3 Side cover (case element)
4 Belt type continuously variable transmission mechanism (transmission mechanism)
40 Transmission input shaft 41 Transmission output shaft 42 Primary pulley 42e Fixed sheave shaft (shaft member)
43 Secondary pulley 43e Fixed sheave shaft (shaft member)
44 Belt 5 Metal frame 51 All-around flange 51a Flange mating surface 52 First bearing support boss (bearing support boss)
53 2nd bearing support boss (bearing support boss)
54 Car body support boss 54a Mount surface 55 Component mounting boss 55a Bolt seat surface 56 Reinforcement arm 57 Hydraulic path arm 58 Projection 6 Resin cover 13 Secondary lubricating pressure oil path (hydraulic path)

Claims (6)

In a transmission case that is configured by flange-joining a plurality of divided case elements, and rotatably supports a shaft member of a transmission mechanism that is assembled inside,
Of the plurality of divided case elements, at least one case element has a composite structure composed of a metal frame and a resin cover,
The metal frame has an all-around flange that is continuous over the entire circumference of the divided opening, a bearing support boss that rotatably supports the shaft member, and a reinforcing arm that connects the all-around flange and the bearing support boss. And
The transmission case, wherein the resin cover closes an opening formed by the metal frame. The transmission case according to claim 1,
The transmission case is characterized in that the resin cover leaves the metal surface exposed at least on the flange mating surface of the all-around flange. In the transmission case according to claim 2,
In the transmission case, the resin cover is formed by biting and joining a metal material and a resin material to a component member that needs to leave the metal surface exposed in the metal frame. In the transmission case according to any one of claims 1 to 3,
The metal frame includes a hydraulic path arm having a hydraulic path formed therein. In the transmission case according to any one of claims 1 to 4,
The metal frame has an inner arrangement toward the speed change mechanism assembled inside,
The transmission case, wherein the resin cover is arranged outside so as to closely cover the entire metal frame except for a portion of the metal frame where the metal surface is left exposed. In the transmission case according to any one of claims 1 to 5,
A transmission case comprising a main transmission case, a converter housing, and a side cover as the plurality of case elements, wherein the side cover has a composite material structure including a metal frame and a resin cover.